JP5551953B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage tank in which water is supplied through a water supply path connected to the bottom and hot water is sent out through a hot water supply path connected to the upper part, and a hot water circulation in a form in which the hot water taken out from the tank bottom is returned to the upper part of the tank. Hot water circulating means for circulating hot water in the hot water storage tank through the passage, heating means for heating hot water flowing through the hot water storage circulation path, heating means for hot water supply heating hot water flowing through the hot water supply path, and operation The present invention relates to a hot water storage type hot water supply apparatus provided with an operation control means for controlling the operation.

Such a hot water storage type hot water supply device is installed in, for example, a general household, and circulates hot water in a hot water tank through a hot water circulation path in such a manner that hot water taken out from the bottom of the tank is returned to the upper part of the tank by hot water circulation means. By heating the hot water flowing through the hot water storage circulation path by the heating means, the hot water is stored in a state where temperature stratification is formed in the hot water storage tank.
Then, hot water is sent out from the upper part of the hot water tank through the hot water supply path and supplied to hot water supply places such as kitchens and baths. When the temperature of the hot water flowing through the hot water supply path is low, the heating means for hot water supply is hot water. Will be heated. Moreover, with the delivery of the hot water, water is supplied to the bottom of the hot water tank through the water supply channel.
Incidentally, the heating means is constituted by a combined heat and power supply device such as a fuel cell that generates heat and electricity, for example.

Moreover, in such a hot water storage type hot water supply apparatus, it is necessary to perform a water quality improvement process for suppressing deterioration of the quality of hot water in the hot water storage tank.
That is, conventionally, hot water at the upper part of the hot water tank or a hot water temperature detecting means for detecting the temperature of hot water existing in the hot water supply path without being adjusted by being sent from the upper part of the hot water tank is provided and operated. When the control means is supplied to the hot water tank through the water supply channel and is not heated by the heating means but is present in the hot water tank, the temperature within the set low temperature range predicted as the temperature of the hot water is detected. When the non-low temperature continuation time for continuing the state not detected by the above becomes the water quality improvement processing timing that is equal to or higher than the low temperature allowable time, the water quality improvement processing for suppressing the deterioration of the hot water quality of the hot water tank is executed. . Incidentally, when the water quality improvement process is executed, the non-low temperature duration time is reset to zero.

  Further, as another configuration for determining the water quality improvement processing timing described above, a plurality of hot water temperature detecting means for detecting the temperature of the hot water in the hot water tank is provided at intervals from the bottom to the upper part of the hot water tank, and the operation control means However, after being supplied to the hot water tank through the water supply channel and not being heated by the heating means, the hot water temperature is higher than the set low temperature range predicted as the temperature of the hot water in the hot water tank. There is also a configuration in which it is determined that the water quality improvement processing timing is reached when the non-low temperature continuation time during which the state detected by at least one of them is continued is equal to or longer than the low temperature setting allowable time.

There are various forms of water quality improvement processing, for example, the operation control means is provided at intervals from the bottom to the top of the hot water tank until the tank upper hot water temperature detection means detects the set low temperature range. Until all of the plurality of hot water temperature detection means detect the set low temperature range, control the operation of the hot water circulation means so that the amount of hot water circulation in the hot water circulation path is less than normal or the hot water in the hot water circulation path There is a case where hot water replacement promotion processing for controlling the operation of the hot water circulation means to stop the circulation is executed.
As another example, when the operation control means reaches the water quality improvement processing timing, the operation stop condition for stopping the operation of the heating means when the heating means is operating and the hot water circulation means is operating. When the operation stop condition is satisfied and the operation of the heating means and the operation of the hot water circulation means are stopped, the bath upper hot water temperature detection means detects the set low temperature range or the bottom of the hot water tank The standby hot water replacement process for stopping the operation of the heating means and the operation of the hot water circulation means may be executed until all of the plurality of hot water temperature detection means provided at intervals from the upper part to the upper part detect the set low temperature range. is there.

And the setting low temperature range for discriminating a water quality improvement process timing was conventionally defined based on the temperature of the hot water supplied to a hot water storage tank.
That is, a water supply temperature detecting means for detecting the temperature of water supplied to the hot water tank through the water supply passage is provided, and the operation control means adds a set margin temperature (for example, 5 ° C.) to the detected temperature of the water supply temperature detecting means. The temperature range below the temperature is set to the set low temperature range (see, for example, Patent Document 1 (Claim 18)).

That is, when the water supplied through the water supply channel is present in the hot water storage tank without being heated by the heating means, the heat transfer from the upper hot water or the hot water storage tank is stored in the hot water storage tank. If the temperature rises due to heat transfer from the peripheral wall, and the degree of temperature rise increases due to, for example, a longer time in the hot water storage tank, the water quality tends to deteriorate.
Therefore, even if hot water supplied in the hot water tank without being heated by the heating means is supplied through the water supply channel, even if the temperature rises, an elevated temperature capable of maintaining the water quality in a good state is tested. Thus, the obtained temperature is set as the set margin temperature, and the temperature range equal to or lower than the temperature obtained by adding the set margin temperature to the detected temperature of the feed water temperature detecting means is set as the set low temperature range.

JP 2009-133608 A

However, conventionally, in homes where the amount of hot water used is small, it is frequently determined that it is the timing of water quality improvement processing, and there is a disadvantage that water quality improvement processing is frequently performed, and improvement is desired. .
In other words, in households where the amount of hot water used is small, the time that the water supplied through the water supply channel is stored in the hot water storage tank tends to be long, and the frequency at which it is determined that it is the timing for water quality improvement processing increases. there were.

In addition, for example, when performing the hot water replacement promotion process or the standby hot water replacement process described above as the water quality improvement process, the tank upper hot water temperature detection means detects the set low temperature range in a household where the amount of hot water used is small. It takes a long time until all of the plurality of hot water temperature detection means provided at intervals from the bottom to the top of the hot water tank detect the set low temperature range. There is also a disadvantage that the heating means configured as described above is stopped for a long time.
For example, when the heating means is a combined heat and power supply device, the time during which the combined heat and power supply device is stopped causes the inconvenience that the operation merit such as energy saving, economical efficiency, and environmental performance cannot be obtained. .

By the way, when the combined heat and power unit is operated using city gas, for example, once every 27 days, to prevent the microcomputer meter for monitoring the gas consumption from causing a leakage alarm. Thus, the operation of the combined heat and power supply apparatus is stopped for 24 hours, which is convenient for executing the standby hot water replacement process described above.
However, in households where the amount of hot water used is low, even if the operation of the combined heat and power unit is stopped for 24 hours, the bath upper hot water temperature detecting means does not detect the set low temperature range, and the hot water tank extends from the bottom to the top. All of the plurality of hot and cold water temperature detecting means provided at intervals may not detect the set low temperature range, and the operation of the combined heat and power supply apparatus may have to be stopped for longer than 24 hours.

  This invention is made | formed in view of this situation, The objective is to provide the hot water storage type hot water supply apparatus which can reduce the frequency which performs a water quality improvement process.

The hot water storage type hot water supply apparatus of the present invention is a hot water storage tank in which water is supplied through a water supply path connected to the bottom part and hot water is sent through a hot water supply path connected to the upper part,
Hot water circulation means for circulating hot water in the hot water storage tank through the hot water circulation path in the form of returning the hot water taken out from the tank bottom to the upper part of the tank;
Heating means for heating hot water flowing through the hot water circulation circuit;
Heating means for hot water supply for heating hot water flowing through the hot water supply path;
An operation control means for controlling the operation, the first characteristic configuration is
A bath upper hot water temperature detecting means for detecting the temperature of hot water present in the hot water supply path without being adjusted by being sent from the upper hot water of the hot water tank or the upper temperature of the hot water tank is provided,
When the non-low temperature duration time during which the operation control means does not detect the temperature within the set low temperature range is not detected by the tank upper hot water temperature detection means becomes the water quality improvement processing timing that is equal to or higher than the set allowable time for low temperature, The water quality improvement process for suppressing the water quality deterioration of the hot water of the water is performed, and the non-low temperature duration time is reset to 0 with the execution of the water quality improvement process,
Regardless of whether or not the water quality improvement process is performed , when the temperature of the hot water supplied to the hot water supply device or the temperature of the hot water in the upper part of the hot water storage tank is lower than the determination reference temperature, It is configured to heat hot water to a heating reference temperature that can improve the water quality of
The set low temperature range is a range lower than the determination reference temperature.

That is, when the temperature of the hot water supplied to the hot water supply device or the temperature of the hot water in the upper part of the hot water storage tank is lower than the determination reference temperature, the heating means for hot water supply is set to a heating reference temperature (for example, 60 ° C.) that can improve the quality of the hot water. Hot water will be heated.
That is, when the temperature of the hot water supplied from the hot water tank is lower than the determination reference temperature, the hot water supply heating means heats the hot water to a heating reference temperature (for example, 60 ° C.) that can improve the water quality. .

The determination reference temperature can be set to, for example, the lowest temperature (for example, 32 ° C.) of hot water required by the user.
That is, the hot water heated to the heating reference temperature is discharged after the temperature is adjusted by the mixing means for adjusting the temperature by mixing the hot water with the water from the water supply channel. Is adjusted to the hot water supply target temperature commanded by the hot water supply target temperature command means, but the determination reference temperature is, for example, the lower limit value of the temperature range that can be commanded by the hot water supply target temperature command means (for example, 32 ° C.).
Incidentally, the mixing means is generally provided in the hot water supply apparatus, but when the automatic adjustment type mixing plug as the mixing means is provided at the hot water supply place, it is not necessary to provide the hot water supply apparatus.

In the case where hot water heated by the hot water supply heating means is adjusted to a hot water supply target temperature (for example, 42 ° C.) set in advance as a fixed value by the mixing means, the determination reference temperature is used. Can be determined as a hot water supply target temperature set in advance as a fixed value.
Incidentally, in the case of this form, generally, a hot water supply point is equipped with an automatic adjustment type or a manually operated type mixing plug.

  When the operation control means reaches the water quality improvement processing timing when the non-low temperature duration time during which the temperature in the set low temperature range is not detected by the tank upper hot water temperature detection means is equal to or higher than the set allowable time for low temperature, The water quality improvement process for suppressing the deterioration of the quality of the hot water of the hot water will be executed, and the non-low temperature duration will be reset to 0 with the execution of the water quality improvement process, but the set low temperature range is less than the judgment reference temperature Therefore, since the non-low temperature duration time is suppressed to be equal to or longer than the set allowable time for low temperature, the frequency at which the water quality improvement process is executed can be reduced.

  That is, since the set low temperature range can be set, for example, to a range lower than the minimum temperature (for example, 32 ° C.) of the hot water temperature requested by the user, the detected temperature (usually normal) 20 ° C or less), and the upper limit value of the set low temperature range is higher than when the temperature range is equal to or less than the temperature obtained by adding the set margin temperature (for example, 5 ° C). It is suppressed that it becomes more than allowable time, and the frequency with which a water quality improvement process is performed will be reduced.

In this way, the set low temperature range is set to a range lower than the determination reference temperature to reduce the frequency at which the water quality improvement process is executed, but it is possible to avoid the supply of hot water having a deteriorated water quality.
In other words, while hot water is circulated by the hot water circulation means, hot water heated by the heating means is stored in the hot water storage tank, and hot water is stored in the hot water storage tank in a state where a temperature stratification is formed. And when the hot water in the hot water tank is used, the water from the water supply channel is supplied to the bottom of the hot water tank, so that the hot water in the hot water tank is heated from the bottom to the top. Will be stored.

  Therefore, if the temperature of the hot water detected by the tank upper hot water temperature detecting means is lower than the judgment reference temperature, the temperature of the hot water supplied from the hot water tank to the hot water supply path after that is lower than the judgment reference temperature. Therefore, if the temperature of the hot water detected by the tank upper hot water temperature detecting means is lower than the judgment reference temperature, the hot water supplied from the hot water storage tank to the hot water supply passage after that is heated by the hot water heating means. Because it will be heated to the heating reference temperature that can improve the water quality of the water, by setting the set low temperature range to a range lower than the judgment reference temperature, it is possible to improve the water quality while avoiding the supply of hot water with reduced water quality The frequency with which the process is executed can be reduced.

  In addition, since the hot water circulated by the hot water circulating means and heated by the heating means is supplied to the upper part of the hot water tank, the temperature of the hot water detected by the hot water temperature detecting means of the tank is determined as the judgment reference temperature. In some cases, the hot water heated by the heating means may be present in the upper part of the hot water tank, but the hot water heated by the heating means is heated to a state where the quality of the hot water can be improved. It is not necessary to heat the hot water so that the water quality can be improved.

  In short, according to the first characteristic configuration of the present invention, a hot water storage type hot water supply device capable of reducing the frequency of executing the water quality improvement processing has been provided.

The hot water storage type hot water supply apparatus of the present invention is a hot water storage tank in which water is supplied through a water supply path connected to the bottom part and hot water is sent through a hot water supply path connected to the upper part,
Hot water circulation means for circulating hot water in the hot water storage tank through the hot water circulation path in the form of returning the hot water taken out from the tank bottom to the upper part of the tank;
Heating means for heating hot water flowing through the hot water circulation circuit;
Heating means for hot water supply for heating hot water flowing through the hot water supply path;
An operation control means for controlling the operation, the second characteristic configuration is
A plurality of hot water temperature detecting means for detecting the temperature of the hot water in the hot water tank is provided at intervals from the bottom to the upper part of the hot water tank,
The operation control means is a water quality improvement process in which a non-low temperature continuation time in which a state in which a temperature higher than a set low temperature range is detected by at least one of the plurality of hot water temperature detection means is equal to or higher than a set allowable time for low temperature When it comes to timing, it is configured to perform a water quality improvement process for suppressing deterioration in the quality of hot water in the hot water storage tank, and to reset the non-low temperature duration to 0 with the execution of the water quality improvement process,
Regardless of whether or not the water quality improvement process is performed , when the temperature of the hot water supplied to the hot water supply device or the temperature of the hot water in the upper part of the hot water storage tank is lower than the determination reference temperature, It is configured to heat hot water to a heating reference temperature that can improve the water quality of
The set low temperature range is a range lower than the determination reference temperature.

That is, when the temperature of the hot water supplied to the hot water supply device or the temperature of the hot water in the upper part of the hot water storage tank is lower than the determination reference temperature, the heating means for hot water supply is set to a heating reference temperature (for example, 60 ° C.) that can improve the quality of the hot water. Hot water will be heated.
That is, when the temperature of the hot water supplied from the hot water tank is lower than the determination reference temperature, the hot water supply heating means heats the hot water to a heating reference temperature (for example, 60 ° C.) that can improve the water quality. .

The determination reference temperature can be set to, for example, the lowest temperature (for example, 32 ° C.) of hot water required by the user.
That is, the hot water heated to the heating reference temperature is discharged after the temperature is adjusted by the mixing means for adjusting the temperature by mixing the hot water with the water from the water supply channel. Is adjusted to the hot water supply target temperature commanded by the hot water supply target temperature command means, but the determination reference temperature is, for example, the lower limit value of the temperature range that can be commanded by the hot water supply target temperature command means (for example, 32 ° C.).
Incidentally, the mixing means is generally provided in the hot water supply apparatus, but when the automatic adjustment type mixing plug as the mixing means is provided at the hot water supply place, it is not necessary to provide the hot water supply apparatus.

In the case where hot water heated by the hot water supply heating means is adjusted to a hot water supply target temperature (for example, 42 ° C.) set in advance as a fixed value by the mixing means, the determination reference temperature is used. Can be determined as a hot water supply target temperature set in advance as a fixed value.
Incidentally, in the case of this embodiment, generally, a hot water supply location is often equipped with an automatic adjustment type or manual operation type mixing plug as a mixing means.

  And the water quality improvement process by which the non-low temperature continuation time during which the operation control means continues the state in which the temperature higher than the set low temperature range is detected by at least one of the plurality of hot water temperature detection means is equal to or higher than the set allowable time for low temperature At the timing, the water quality improvement process for suppressing the deterioration of the quality of the hot water in the hot water tank is executed, and the non-low temperature duration time is reset to 0 with the execution of the water quality improvement process. However, since it is in the range lower than the determination reference temperature, the non-low temperature duration time is suppressed from being equal to or higher than the low temperature setting allowable time, so that the frequency of executing the water quality improvement process can be reduced.

  That is, since the set low temperature range can be set, for example, to a range lower than the minimum temperature (for example, 32 ° C.) of the hot water temperature requested by the user, the detected temperature (usually normal) 20 ° C or less), and the upper limit value of the set low temperature range is higher than when the temperature range is equal to or less than the temperature obtained by adding the set margin temperature (for example, 5 ° C). It is suppressed that it becomes more than allowable time, and the frequency with which a water quality improvement process is performed will be reduced.

In this way, the set low temperature range is set to a range lower than the determination reference temperature to reduce the frequency at which the water quality improvement process is executed, but it is possible to avoid the supply of hot water having a deteriorated water quality.
In other words, while hot water is circulated by the hot water circulation means, hot water heated by the heating means is stored in the hot water storage tank, and hot water is stored in the hot water storage tank in a state where a temperature stratification is formed. And when the hot water in the hot water tank is used, the water from the water supply channel is supplied to the bottom of the hot water tank, so that the hot water in the hot water tank is heated from the bottom to the top. Will be stored.

  Therefore, if the temperature of the hot water detected by the plurality of hot water temperature detection means is lower than the determination reference temperature, the temperature of the hot water supplied from the hot water tank to the hot water supply path after that is lower than the determination reference temperature. If the temperature of the hot water detected by the plurality of hot water temperature detecting means is lower than the judgment reference temperature, the hot water supplied from the hot water storage tank to the hot water supply path after that is determined by the hot water heating means. Since it is heated to a heating reference temperature that can be improved, by setting the set low temperature range to a range that is lower than the judgment reference temperature, water quality improvement processing is performed while avoiding the supply of hot water with reduced water quality The frequency of being played can be reduced.

  In addition, since the hot water circulated by the hot water circulating means and heated by the heating means is supplied to the upper part of the hot water tank, the temperature of the hot water detected by the hot water temperature detecting means of the tank is determined as the judgment reference temperature. In some cases, the hot water heated by the heating means may be present in the upper part of the hot water tank, but the hot water heated by the heating means is heated to a state where the quality of the hot water can be improved. It is not necessary to heat the hot water so that the water quality can be improved.

  In short, according to the second characteristic configuration of the present invention, a hot water storage type hot water supply apparatus capable of reducing the frequency of executing the water quality improvement processing has been provided.

In addition to the first or second characteristic configuration described above, the third characteristic configuration of the hot water storage type hot water supply apparatus of the present invention includes:
A hot water supply target temperature command means for changing and setting the hot water supply target temperature is provided,
Mixing means for mixing the hot water from the water supply path with hot water flowing through the hot water supply path after being heated by the heating means for hot water supply and adjusting to the hot water supply target temperature is provided,
The determination reference temperature is a lower limit value of a temperature range that can be commanded by the hot water supply target temperature command means.

That is, the hot water heated to the heating reference temperature by the hot water supply heating means is adjusted to the hot water supply target temperature commanded by the hot water supply target temperature command means by the mixing means, and hot water is supplied.
Then, the determination reference temperature in the hot water supply heating means is set to the lower limit of the temperature range that can be commanded by the hot water supply target temperature command means, and the hot water supply heating means determines the temperature of the hot water supplied to itself or the When the temperature of the upper hot water is lower than the determination reference temperature, the hot water is heated to a heating reference temperature that can improve the quality of the hot water.

  Thus, the determination reference temperature in the hot water supply heating means is set to the lower limit value of the temperature range that can be commanded by the hot water supply target temperature command means, so that the hot water supply heating means avoids the heating operation as much as possible. However, hot water at the hot water supply target temperature commanded by the hot water supply target temperature command means can be supplied.

Incidentally, in this third characteristic configuration, the set low temperature range is such that the hot water supply heating temperature is set even when the hot water supply target temperature is set to the lower limit (determination reference temperature) of the temperature range that can be commanded by the hot water supply target temperature commanding means. However, the upper limit temperature of the hot water supplied to the heating means for hot water supply or hot water in the upper part of the hot water storage tank is heated to the heating reference temperature that can improve the quality of the hot water. When the temperature of the hot water supplied to the hot water supply heating means or the hot water in the hot water storage tank is within the set low temperature range, the hot water supply heating means can be used regardless of the target hot water supply temperature. However, the hot water is heated to a heating reference temperature that can improve the quality of the hot water.
And hot water is stored in the hot water storage tank in a state in which temperature stratification is formed, and hot water is stored in the hot water storage tank in a form of high temperature from the bottom to the top. When the temperature of the hot water supplied to the heating means or the hot water in the hot water tank falls within the set low temperature range, the temperature of the hot water supplied to the heating means for hot water supply or the hot water in the hot water tank falls within the set low temperature range thereafter. Therefore, the hot water supply heating means accurately heats the hot water to the heating reference temperature at which the quality of the hot water can be improved, and it is a matter of course that the hot water supply without improving the water quality is suppressed.

  The heating means for hot water supply means that the temperature of the hot water supplied to itself or the temperature of the hot water in the upper part of the hot water tank is higher than the judgment reference temperature, or the temperature of the hot water supplied to itself or the upper part of the hot water tank. When the temperature of the hot water is lower than the target hot water supply temperature, the hot water is heated, and the temperature at which the hot water is heated can be set to a heating reference temperature that can improve water quality. It can also be set to a temperature that is higher than the set hot water supply temperature.

  In short, according to the third characteristic configuration of the present invention, in addition to the operational effect of the first or second characteristic configuration, the hot water supply heating means avoids the heating operation as much as possible, and the hot water supply target temperature command means Thus, a hot water storage type hot water supply apparatus capable of supplying hot water at a target hot water supply temperature has been provided.

In addition to the first or second characteristic configuration described above, the fourth characteristic configuration of the hot water storage type hot water supply apparatus of the present invention includes:
A hot water supply target temperature command means for changing and setting the hot water supply target temperature is provided,
Mixing means for mixing the hot water from the water supply path with hot water flowing through the hot water supply path after being heated by the heating means for hot water supply and adjusting to the hot water supply target temperature is provided,
The determination reference temperature is a temperature obtained by adding a set increase temperature to a lower limit value of a temperature range that can be commanded by the hot water supply target temperature command means.

That is, the hot water heated to the heating reference temperature by the hot water supply heating means is adjusted to the hot water supply target temperature commanded by the hot water supply target temperature command means by the mixing means, and hot water is supplied.
Then, the determination reference temperature in the hot water supply heating means is set to a temperature obtained by adding the set increase temperature to the lower limit of the temperature range that can be commanded by the hot water supply target temperature command means, and the hot water supply heating means is supplied to itself. When the temperature of the hot water or the temperature of the hot water in the upper part of the hot water tank is lower than the judgment reference temperature, the hot water is heated to a heating reference temperature that can improve the quality of the hot water.

  As described above, the determination reference temperature in the hot water supply heating means is determined to be a temperature obtained by adding the set temperature to the lower limit value of the temperature range that can be commanded by the hot water supply target temperature command means. The hot water at the hot water supply target temperature commanded by the hot water supply target temperature command means can be accurately supplied while avoiding performing the heat as much as possible.

  That is, when the determination reference temperature in the hot water supply heating means is set to the lower limit value of the temperature range that can be commanded by the hot water supply target temperature command means, the temperature of the supplied hot water or the temperature of the hot water in the hot water tank is in a very small range. If it fluctuates, it may repeat the state of executing the heating operation of the heating means for hot water supply and the state of stopping the heating operation, and accordingly, even if the mixing means performs the temperature adjustment operation, the operation There is a risk that hot water with extremely low temperature may be supplied due to the delay, but the temperature is determined by adding the set temperature to the lower limit of the temperature range that can be commanded by the hot water supply target temperature command means. However, it is possible to suppress the supply of hot water that is extremely low.

Incidentally, in the fourth feature configuration, when the set low temperature range is set to a temperature (determination reference temperature) obtained by adding the set temperature to the lower limit value of the temperature range that can be commanded by the hot water target temperature command means. Moreover, the upper limit temperature of the temperature range of the hot water supplied to the heating means for hot water supply or hot water to the hot water storage tank, where the heating means for hot water supply heats the hot water to the heating reference temperature that can improve the quality of the hot water, Since this corresponds to the range of the upper limit temperature, when the temperature of the hot water supplied to the hot water supply heating means or the hot water in the hot water storage tank is within the set low temperature range, the hot water supply target temperature is changed to any temperature. However, the hot water supply heating means heats the hot water to a heating reference temperature that can improve the quality of the hot water.
And hot water is stored in the hot water storage tank in a state in which temperature stratification is formed, and hot water is stored in the hot water storage tank in a form of high temperature from the bottom to the top. When the temperature of the hot water supplied to the heating means or the hot water in the hot water tank falls within the set low temperature range, the temperature of the hot water supplied to the heating means for hot water supply or the hot water in the hot water tank falls within the set low temperature range thereafter. Therefore, the hot water supply heating means accurately heats the hot water to the heating reference temperature at which the quality of the hot water can be improved, and it is a matter of course that the hot water supply without improving the water quality is suppressed.

  The heating means for hot water supply means that the temperature of the hot water supplied to itself or the temperature of the hot water at the upper part of the hot water tank is higher than the judgment reference temperature, or the hot water supplied to itself or the hot water at the upper part of the hot water tank. When the temperature of the hot water is lower than the hot water supply target temperature, the hot water is heated, and the hot water temperature can be set to a heating reference temperature that can improve the water quality. It can also be set to a temperature that is higher than the temperature by a set value.

  In short, according to the fourth characteristic configuration of the present invention, in addition to the operational effects of the first or second characteristic configuration, the hot water supply heating means avoids the heating operation as much as possible, and the hot water supply target temperature command means Thus, a hot water storage type hot water supply apparatus capable of accurately supplying hot water at the target hot water supply temperature has been provided.

In addition to any of the first to fourth characteristic configurations described above, the fifth characteristic configuration of the hot water storage type hot water supply apparatus of the present invention is:
Hot water delivery stop means is provided that can be switched to a hot water delivery stop state for stopping delivery of hot water from the hot water tank through the hot water supply path,
The operation control means operates the hot water circulation means in a state where the hot water delivery stop means is switched to the hot water delivery stop state as the water quality improvement processing, and the heating means or the heating means different from the heating means. The present invention is characterized in that it is configured to execute a hot water delivery stop state heating process in which another heating means for heating the hot water flowing through the circulation path is heated.

  That is, as the water quality improvement process, the operation control means operates the hot water circulation means in a state where the hot water delivery stop means is switched to the hot water delivery stop state, and passes the hot water storage circuit different from the heating means or the heating means. A hot water delivery stop state heating process is performed in which another heating means for heating the flowing hot water is heated.

That is, in the hot water delivery stop state heating process, the hot water stored in the hot water storage tank after the water taken out from the bottom of the hot water storage tank is heated by the heating means or another heating means in a state where the hot water supply of the hot water storage tank through the hot water supply passage is stopped. It will be returned to the top of the tank.
By the way, the configuration for ending the hot water delivery stop state heating process includes a configuration that ends when a preset heating time elapses, and a bath bottom hot water temperature detection means that detects the temperature of hot water at the bottom of the hot water tank. It can be configured such that it ends when a temperature within the set high temperature range is detected or when all of the plurality of hot water temperature detecting means in the second characteristic configuration detect a temperature within the set high temperature range.

  In this way, hot water that has not been improved in quality is heated by heating the hot water in the hot water tank to a set high temperature range that can improve the water quality in a state in which the hot water of the hot water tank through the hot water supply channel is stopped. Can be avoided.

  In short, according to the fifth characteristic configuration of the present invention, a hot water storage type hot water supply apparatus capable of avoiding hot water whose water quality is not improved has been provided.

In addition to any of the first to fourth characteristic configurations described above, the sixth characteristic configuration of the hot water storage type hot water supply apparatus of the present invention is:
The hot water at the upper part of the hot water tank or the hot water temperature detecting means for detecting the temperature of hot water that is sent from the upper part of the hot water tank and the temperature of the hot water is not adjusted, or the bottom of the hot water tank A plurality of hot water temperature detection means for detecting the temperature of the hot water in the hot water storage tank is disposed at intervals from the upper part,
The operation control means, as the water quality improvement processing, until the temperature within the set low temperature range is detected by the tank upper hot water temperature detection means, or the set low temperature range in all of the plurality of hot water temperature detection means Until the temperature inside is detected, the operation of the hot water circulation means is controlled so that the amount of hot water circulation in the hot water circulation circuit is made smaller than normal or the circulation of hot water in the hot water circulation circuit is stopped. Further, the present invention is characterized in that a hot water replacement promotion process for controlling the operation of the hot water circulating means is executed.

  That is, the operation control means controls the operation of the hot water circulation means so as to reduce the amount of hot water circulation in the hot water circulation path as compared with the normal time, or stops hot water circulation in the hot water circulation path as the water quality improvement process. Hot water replacement promotion processing for controlling the operation of the circulation means is executed.

  In other words, when the hot water replacement promotion process is executed in such a manner that the hot water circulation amount in the hot water circulation path is smaller than usual, it is taken out from the bottom of the hot water tank and heated by the heating means, and then placed on the upper part of the hot water tank. When the amount of hot water supplied is less than normal and the hot water replacement promotion process is executed in such a way that the circulation of hot water in the hot water circulation circuit is stopped, the hot water taken out from the bottom of the hot water tank is heated by the heating means. Since the hot water in the hot water tank is not circulated in the form of being returned to the upper part of the hot water tank after being heated, the hot water in the hot water tank is sent from the upper part of the hot water tank through the hot water supply path and is supplied with hot water. As a result, the hot water supplied to the bottom of the hot water storage tank through the water supply path is suppressed from being circulated through the hot water circulation path and heated and kept stored at the bottom of the hot water tank. so Because, in that it is replaced in the hot water supplied from the water supply passage to hot water in the hot water tank, it is possible to accelerate.

And until the tank upper hot water temperature detecting means detects the temperature within the set low temperature range, or until all of the plurality of hot water temperature detecting means detect the temperature within the set low temperature range, the hot water replacement promotion process is executed. Thus, it is possible to improve the quality of the hot water in the hot water storage tank to a good state.
Moreover, since the set low temperature range is determined to be, for example, a range below the minimum temperature (for example, 32 ° C.) of the hot water required by the user, the detected temperature (usually 20 The upper limit value of the set low temperature range is higher than when the temperature range is equal to or lower than the temperature obtained by adding the set margin temperature (for example, 5 ° C.) to the temperature range below (° C.) It becomes.

  In short, according to the sixth characteristic configuration of the present invention, there is provided a hot water storage type hot water supply apparatus that can avoid the supply of hot water whose water quality has not been improved, and that can finish the water quality improvement process early. It came to offer.

In addition to the first to fourth feature configurations described above, the seventh feature configuration of the hot water storage type hot water supply apparatus of the present invention includes:
The hot water at the upper part of the hot water tank or the hot water temperature detecting means for detecting the temperature of hot water that is sent from the upper part of the hot water tank and the temperature of the hot water is not adjusted, or the bottom of the hot water tank A plurality of hot water temperature detection means for detecting the temperature of the hot water in the hot water storage tank is disposed at intervals from the upper part,
The operation control means stops the operation of the heating means when the heating means is operating and the hot water circulation means is operating when the water quality improvement processing timing is reached as the water quality improvement processing. When the operation stop condition is satisfied and the operation of the heating means and the operation of the hot water circulation means are stopped, the tank upper hot water temperature detection means falls within the set low temperature range. Until the temperature of the hot water is detected, or until the temperature within the set low temperature range is detected by all of the plurality of hot water temperature detecting means, and the operation of the heating means and the operation of the hot water circulating means are stopped. It is characterized by the point comprised so that a hot-water replacement | exchange process may be performed.

That is, the operation control means, as the water quality improvement process, the operation stop condition for stopping the operation of the heating means when the heating means is operating and the hot water circulation means is operating when the water quality improvement processing timing comes. Until the condition is satisfied, the operation of the heating means and the operation of the hot water circulation means are not stopped and the apparatus waits.
When the operation stop condition is satisfied and the operation of the heating means and the operation of the hot water circulation means are stopped, the temperature in the set low temperature range is detected by the tank upper hot water temperature detection means, or a plurality of hot water temperature detections are performed. Until all of the means detect the temperature within the set low temperature range, the standby hot water replacement process for stopping the operation of the heating means and the operation of the hot water circulation means is executed.

  In the standby hot water replacement process, the hot water in the hot water tank is not circulated in such a manner that the hot water taken out from the bottom of the hot water tank is heated by the heating means and then returned to the upper part of the hot water tank. As hot water in the tank is sent from the top of the hot water tank through the hot water path and hot water is supplied, hot water supplied to the bottom of the hot water tank through the hot water path is not circulated through the hot water circulation path. Therefore, it is possible to accelerate the replacement of the hot water in the hot water tank with the hot water supplied from the water supply channel.

  Moreover, since the set low temperature range is determined to be, for example, a range below the minimum temperature (for example, 32 ° C.) of the hot water required by the user, the detected temperature (usually 20 The upper limit value of the set low temperature range is higher than when the temperature range is equal to or lower than the temperature obtained by adding the set margin temperature (for example, 5 ° C.) to the temperature range below (° C. or lower). It becomes.

In addition, when it is time to improve the water quality, when the heating means is in operation and the hot water circulation means is in operation, wait until the operation stop condition for stopping the operation of the heating means is satisfied, Since it is intended to avoid stopping the operation of the heating means or stopping the operation of the hot water circulation means for the water quality improvement process, the heating means is in operation when the water quality improvement process timing comes. When the hot water circulating means is in operation, the heating means and hot water circulating means are activated compared to stopping the operation of the heating means and stopping the hot water circulating means for water quality improvement processing. And it can suppress that the frequency | count of a stop increases for a water quality improvement process, and can suppress that a heating means and a hot-water circulation means deteriorate by the increase in the frequency | count of a start and a stop.
That is, the heating means becomes high temperature when activated, and becomes low temperature when stopped, and may be deteriorated due to repeated thermal stress due to temperature changes associated with activation and deactivation. By suppressing the increase in the number of times, the deterioration of the heating means can be suppressed.
Also, the hot water circulation means is actuated by a load (torque) for hot water circulation when activated, and becomes unloaded when stopped, and when activated from the stop, Since the load is suddenly applied, the rapid load fluctuation may be repeated and deteriorated. However, by suppressing the increase in the number of start and stop times, the deterioration of the hot water circulation means can be suppressed. It is.

  Incidentally, when it is time to improve the water quality, when the heating means is stopped and the hot water circulation means is not operating, the temperature in the set low temperature range is detected by the tank upper hot water temperature detecting means. The operation of the heating means and the operation of the hot water circulation means may be stopped until the temperature within the set low temperature range is detected by all of the plurality of hot water temperature detection means.

  In short, according to the seventh characteristic configuration of the present invention, in addition to the operational effects of the first to fourth characteristic configurations, it is possible to avoid the supply of hot water whose water quality has not been improved, and the heating means and hot water. The present invention has led to the provision of a hot water storage type hot water supply apparatus that can suppress the deterioration of the circulation means and can finish the water quality improvement process at an early stage.

Block diagram showing the overall configuration of the cogeneration system The figure which shows the flowchart of the control action in 1st Embodiment. The figure which shows the flowchart of the control action in 1st Embodiment. The figure which shows the flowchart of the control action in 2nd Embodiment. The figure which shows the flowchart of the control action in 3rd Embodiment. The figure which shows the flowchart of the control action in 4th Embodiment. The figure which shows the flowchart of the control action in 5th Embodiment. The figure which shows the flowchart of the control action in 6th Embodiment. The figure which shows the flowchart of the control action in 17th Embodiment.

[First Embodiment]
Hereinafter, a first embodiment in the case where a hot water storage type hot water supply apparatus according to the present invention is applied to a cogeneration system will be described based on the drawings.
As shown in FIG. 1, the cogeneration system recovers the heat generated by the fuel cell 1 as a cogeneration device that generates electric power and heat, and the heat generated by the fuel cell 1 with cooling water, and uses the cooling water. From the hot water storage / heating unit 4 for storing hot water in the hot water storage tank 2 and supplying the heat medium to the heat consuming terminal 3, the operation control unit 5 as operation control means for controlling the operation of the fuel cell 1 and the hot water storage / heating unit 4, etc. It is configured. Incidentally, as the heat consuming terminal 3, a floor heating device, a bathroom heating dryer, a fan convector or the like is provided.

Since the fuel cell 1 is well-known, a detailed description and illustration thereof will be omitted. Briefly, the fuel cell 1 includes a cell stack that generates power by being supplied with a fuel gas containing hydrogen and an oxygen-containing gas. A fuel gas generation unit that generates fuel gas to be supplied to the cell stack, a blower that supplies air as an oxygen-containing gas to the cell stack, and the like are provided.
The fuel gas generation unit includes a desulfurizer for desulfurizing a hydrocarbon-based raw fuel gas such as a supplied city gas (for example, a natural gas-based city gas), a desulfurized raw fuel gas supplied from the desulfurizer, A reformer that generates a reformed gas mainly composed of hydrogen by reforming reaction with steam supplied separately, and carbon monoxide in the reformed gas supplied from the reformer with carbon dioxide. A carbon monoxide remover that selectively oxidizes carbon monoxide in the reformed gas supplied from the transformer with selective oxidation air supplied separately. The reformed gas reduced by the shift treatment and the selective oxidation treatment is supplied to the cell stack as the fuel gas.

And it is comprised so that the electric power generation output of the said fuel cell 1 may be adjusted by adjusting the supply amount of the raw fuel gas to the said fuel gas production | generation part.
A grid interconnection inverter 6 is provided on the power output side of the fuel cell 1, and the inverter 6 has the same voltage and the same frequency as the received power for receiving the generated power of the fuel cell 1 from the commercial power supply 7. Is configured to do.
The commercial power source 7 is electrically connected to a power load 9 such as a television, a refrigerator, or a washing machine via a received power supply line 8.
The inverter 6 is electrically connected to the received power supply line 8 via the generated power supply line 10, and the generated power of the fuel cell 1 is supplied to the power load 9 via the inverter 6 and the generated power supply line 10. It is comprised so that.

The received power supply line 8 is provided with power load measuring means 11 for measuring the load power of the power load 9, and the power load measuring means 11 generates a reverse power flow in the current flowing through the received power supply line 8. It is configured to detect whether or not.
The electric power supplied from the fuel cell 1 to the received power supply line 8 is controlled by the inverter 6 so that a reverse power flow does not occur, and the surplus power of the power generation output is recovered by replacing the surplus power with heat. 12 is configured to be supplied.

The electric heater 12 is composed of a plurality of electric heaters and is provided so as to heat the cooling water of the fuel cell 1 flowing through the cooling water circulation path 13 by the operation of the cooling water circulation pump 15. It is configured so that ON / OFF can be individually switched by the connected operation switch 14.
The operation switch 14 is configured to adjust the power consumption of the electric heater 12 according to the amount of surplus power so that the power consumption of the electric heater 12 increases as the amount of surplus power increases. Yes.
The configuration for adjusting the power consumption of the electric heater 12 is a configuration for adjusting the output of the electric heater 12 by, for example, phase control or the like in addition to the configuration for switching ON / OFF of the plurality of electric heaters 12 as described above. You may adopt.

  The hot water storage / heating unit 4 is supplied with water through a water supply path 16 connected to the bottom and is supplied with hot water through a hot water supply path 17 connected to the top. In the form of returning, the hot water circulating pump 19 as hot water circulating means for circulating hot water in the hot water tank 2 through the hot water circulating circuit 18 (shown by a thick line) in FIG. A heat medium circulating pump 21 that circulates and supplies the water, a hot water storage heat exchanger 22 that heats hot water flowing through the hot water circulation path 18, and a heating medium heating that heats the heat medium flowing through the heating medium circulation path 20. Heat exchanger 23, hot water auxiliary heater 24 as hot water heating means for heating hot water sent from hot water storage tank 2 and flowing through hot water supply path 17, and heat flowing through heating medium circulation path 20 Heat the medium It is configured to include a like medium auxiliary heater 25.

  The hot water storage circulation path 18 is connected to the bottom and top of the hot water tank 2, and the hot water storage heat exchanger 22 is connected to the cooling water of the fuel cell 1 flowing through the cooling water circulation path 13 and the hot water circulation. Heat exchange is provided with hot water flowing through the passage 18.

  A return flow path portion returning from the hot water storage heat exchanger 22 to the fuel cell 1 in the cooling water circulation path 13 is provided with a radiator 33 that cools the cooling water returning to the fuel cell 1, and further in the return flow path portion. A cooling water return temperature sensor Sr for detecting the temperature of the cooling water returning to the fuel cell 1 is provided at a location between the radiator 33 and the fuel cell 1.

  After branching from the circulation path portion connecting the hot water storage heat exchanger 22 and the upper part of the hot water storage tank 2 in the hot water storage circuit 18, the hot water storage tank 2 is bypassed and connected to the bottom of the hot water storage tank 2. The heating medium heating flow path portion 18b connected to the circulating path portion is provided, and the heating medium heating heat exchanger 23 and hot water circulating through the heating medium heating flow path portion 18b and the heating medium circulation are provided. The heat medium flowing through the passage 20 is provided to exchange heat, and hot water is added to the branch portion of the heat medium heating flow path portion 18b in the hot water storage circulation path 18, and the hot water is supplied to the heat medium heating flow path portion 18b. There is provided a heating switching three-way valve 26 for switching between a heating medium heating state to be passed and a heating medium non-heating state in which hot and cold water is not passed through the heating medium heating flow path portion 18b.

Then, the cooling water recovered from the heat generated by the fuel cell 1 is circulated through the hot water storage heat exchanger 22 through the cooling water circulation path 13 by the cooling water circulation pump 15, and the hot water in the hot water tank 2 is circulated by the hot water circulation pump 19. In the state where the hot water storage heat exchanger 22 is passed through and circulated through the hot water storage circulation path 18, the fuel cell 1 is operated in the hot water storage heat exchanger 22 by switching the heating switching three-way valve 26 to the heat medium non-heating state. The hot water heated by the cooling water is supplied to the upper part of the hot water tank 2 as it is, and hot water is stored in a state where a temperature stratification is formed in the hot water tank 2.
Further, by switching the heating switching three-way valve 26 to the heating medium heating state and circulating the cooling water recovered from the heat generated by the fuel cell 1 through the heating medium heating flow path portion 18b, the hot water storage heat exchanger 22 is circulated. The hot water heated by the cooling water of the fuel cell 1 heats the heat medium flowing through the heat medium circulation path 20 in the heat medium heating heat exchanger 23.
That is, the heating unit H as heating means for heating the hot water flowing through the hot water storage circuit 18 includes the fuel cell 1, the cooling water circuit 13, the cooling water circulation pump 15, the hot water storage circuit 18, A hot water circulation pump 19 and the hot water storage heat exchanger 22 are provided.

A tank detour water supply path 27 is provided in a form that is connected to a location upstream of the hot water supply auxiliary heater 24 in the water supply path 16 and the hot water supply path 17 and bypasses the hot water storage tank 2. A normal water supply state in which a portion of the hot water supply passage 17 on the side of the hot water storage tank 2 and a portion of the hot water supply auxiliary heater 24 side of the hot water supply passage 17 are connected to the connection portion between the bypass water supply passage 27 and the hot water supply passage 17; A water supply switching three-way valve 28 that switches to a tank bypass water supply state that communicates with the hot water supply auxiliary heater 24 side portion in the hot water supply path 17 is provided.
The water supply switching three-way valve 28 is a hot water supply auxiliary than the water supply switching three-way valve 28 in the hot water supply passage 17 in both the hot water tank 2 side of the hot water supply passage 17 and the tank bypass water supply passage 27 in the hot water supply passage 17. In a state where it is communicated with the portion on the heater 24 side, the mixing ratio of the hot water from the hot water supply passage 17 and the water from the tank bypass water supply passage 27 can be switched to an adjustable mixing ratio adjustment state. Yes.

In the state where the water supply switching three-way valve 28 is switched to the normal water supply state, when a hot water tap (not shown) or the like provided at the tip of the hot water supply passage 17 is opened, the upper part of the hot water tank 2 is opened. In the state where hot water is sent to the hot water supply passage 17, water is supplied to the bottom of the hot water storage tank 2 through the water supply passage 16, while the water supply switching three-way valve 28 is switched to the tank bypass water supply state. When the hot water tap is opened, water is supplied to the hot water supply passage 17 through the tank bypass water supply passage 27, and the delivery of hot water from the hot water storage tank 2 is stopped.
That is, the water supply switching three-way valve 28 corresponds to a hot water supply stop means that can be switched to a hot water supply stop state that stops the supply of hot water in the hot water tank 2 through the hot water supply passage 17.

  The heating medium circulation path 20 is provided with a terminal bypass circuit 29 that bypasses the heat consuming terminal 3 and allows the heating medium to flow therethrough. Further, a connection portion between the heating medium circulation path 20 and the terminal bypass circuit 29 is provided at the connection portion. The heat medium circulation switching three-way valve 30 that can be switched between a normal flow state in which the heat medium is circulated through the heat consumption terminal 3 and a terminal bypass flow state in which the heat medium is circulated through the terminal bypass circuit 29 to bypass the heat consumption terminal 3. Is provided.

The hot water supply auxiliary heater 24 and the heat medium auxiliary heater 25 have the same configuration, and are respectively a heat exchanger h for heating hot water or a heat medium, a burner b for heating the heat exchanger h, and a burner thereof. a fan f for supplying combustion air to b, an inflow temperature sensor (not shown) for detecting the inflow temperature of hot water or heat medium flowing into the heat exchanger h, and the outflow temperature of hot water or heat medium flowing out of the heat exchanger h And a flow rate sensor (not shown) for detecting the flow rate of hot water or heat medium flowing into the heat exchanger h, and the like. The operation of the auxiliary heater 25 is controlled by the operation control unit 5.
The heat exchanger h of the hot water supply auxiliary heater 24 is provided so as to heat hot water flowing through the hot water supply passage 17, and the heat exchanger h of the heat medium auxiliary heater 25 is provided with the heat medium circulation. A heating medium flowing through the passage 20 is provided to be heated.

The operation control of the hot water supply auxiliary heater 24 by the operation control unit 5 will be described. The inflow temperature (hot water supply) detected by the inflow temperature sensor in a state where the flow rate sensor detects a flow rate equal to or higher than a set flow rate. The temperature of the hot water supplied to the auxiliary heater for heating 24) becomes less than the hot water supply target temperature, the burner b is combusted, and the outflow temperature detected by the outflow temperature sensor becomes the target heating temperature. The amount of combustion of b is adjusted, and the burner b is extinguished when the detected flow rate of the flow sensor becomes less than the set flow rate during combustion of the burner b.
Further, when the inflow temperature detected by the inflow temperature sensor (the temperature of hot water supplied to the hot water supply auxiliary heater 24) is lower than the determination reference temperature (for example, 37 ° C.), the hot water is heated to the heating reference temperature. In addition, the burner b is burned, and the amount of combustion of the burner b is adjusted so that the outflow temperature detected by the outflow temperature sensor becomes the target heating temperature.

The target heating temperature in the hot water supply auxiliary heater 24 is set to a heating reference temperature (for example, 60 ° C.) that can improve the quality of hot water.
In other words, the hot water supply auxiliary heater 24 is configured to heat the hot water to the heating reference temperature (for example, 60 ° C.) when the temperature of the hot water supplied to the hot water is lower than the determination reference temperature (for example, 37 ° C.). In addition, even if the temperature of the hot water supplied to itself is equal to or higher than the reference temperature, if the temperature of the hot water supplied to itself is lower than the target hot water temperature, the hot water is set to the heating reference temperature (for example, 60 ° C.). It is comprised so that it may heat.

And the mixing means which mixes the hot water from 16 A of water supply paths branched from the water supply path 16 mentioned above with respect to the hot water from the hot water supply path 17 in the downstream part of the hot water supply auxiliary heater 24 in the hot water supply path 17. A mixing valve 34 is provided.
This mixing valve 34 is supplied from the hot water supply passage 17 so that the temperature of the hot water discharged from the hot water supply passage 17 becomes the target hot water supply temperature set by the operation remote controller R that commands various information to the operation control unit 5. The operation control unit 5 is provided for mixing hot water from the water supply channel portion 16A with hot water, and based on detection information from a mixed hot water temperature sensor (not shown) or the like for detecting the mixed hot water temperature. Is configured to control the operation of the mixing valve 34.

Incidentally, in this embodiment, the operation remote controller R functions as a hot water supply target temperature command means for changing and setting the hot water supply target temperature, and the operation remote controller R has a temperature range between 32 ° C. and 60 ° C., for example. The hot water supply target temperature is commanded.
Then, the determination reference temperature is set to a temperature obtained by adding a set increase temperature (for example, 5 ° C.) to the lower limit value of the temperature range that can be commanded by the operation remote controller R.
Incidentally, the determination reference temperature can be set to the lower limit value of the temperature range that can be commanded by the operation remote controller R.

The operation control of each of the auxiliary heaters 25 for the heat medium by the operation control unit 5 will be briefly described. In the state where the flow sensor detects a flow rate higher than a set flow rate, it is detected by the inflow temperature sensor. When the inflow temperature becomes lower than the target temperature, the burner b is combusted, and the combustion amount of the burner b is adjusted so that the outflow temperature detected by the outflow temperature sensor becomes the target temperature. When the detected flow rate of the flow sensor becomes less than the set flow rate, the burner b is extinguished.
The target temperature in the auxiliary heater 25 for the heat medium is set to a high temperature target temperature (for example, 80 ° C.) when the heat consuming terminal 3 needs a high temperature, and the heat consuming terminal 3 needs a high temperature. When not, it is set to a low temperature target temperature (for example, 60 ° C.).

  The water supply passage 16 is provided with a water supply temperature sensor Si for detecting the temperature of water supplied to the hot water storage tank 2 through the water supply passage 16, and the hot water storage heat exchanger 22 in the hot water storage circulation passage 18 and the A hot water storage temperature sensor Sh for detecting the temperature of the hot water heated by the hot water storage heat exchanger 22 is provided at a location between the heating switching three-way valve 26.

  The hot water tank 2 has a tank upper hot water temperature sensor St as a tank upper hot water temperature detecting means for detecting the temperature of hot water in the upper part thereof, and a middle layer portion of the hot water tank 2 divided into three equal parts in the vertical direction. An intermediate upper hot water temperature sensor Sm for detecting the temperature of hot water at the upper end portion, an intermediate lower hot water temperature sensor Sn for detecting the temperature of hot water at the lower end portion in the middle layer of the hot water tank 2, and the temperature of hot water at the bottom of the hot water tank 2 A bath bottom hot water temperature sensor Sb is provided as a bath bottom hot water temperature detecting means for detecting the water temperature.

The operation control unit 5 stores the amount of stored hot water in the hot water storage tank 2 based on the detected temperatures of the hot water temperature sensors St, Sm, Sn, Sb and the feed water temperature sensor Si at the tank upper part, middle upper part, middle lower part, and tank bottom part. Hereinafter, a method for calculating the amount of stored hot water will be described.
The temperatures of hot water in the hot water tank 2 detected by the tank upper hot water temperature sensor St, the intermediate upper hot water temperature sensor Sm, the intermediate lower hot water temperature sensor Sn, and the tank bottom hot water temperature sensor Sb are respectively Tt, Tm, Tn. , Tb, the feed water temperature detected by the feed water temperature sensor Si is Ti, and the capacities of the upper layer portion, the middle layer portion, and the lower layer portion are V (liters).
Further, assuming that the weighting coefficient in the upper layer part is A1, the weighting coefficient in the middle layer part is A2, and the weighting coefficient in the lower layer part is A3, the stored hot water calorie (kcal) is calculated by the following (Equation 1). be able to. In this embodiment, the unit of calorie may be indicated by kcal, but it is obtained as a unit of kWh by dividing each value by the coefficient α set to 860 based on the relationship of 1 kWh = 860 kcal. be able to.

Hot water storage heat amount = (A1 × Tt + (1−A1) × Tm−Ti) × V
+ (A2 * Tm + (1-A2) * Tn-Ti) * V
+ (A3 * Tn + (1-A3) * Tb-Ti) * V (Equation 1)

  The weighting factors A1, A2, A3 are empirical values considering past temperature distribution data in each layer of the hot water tank 2. Here, as A1, A2, A3, for example, A1 = A2 = 0.2 and A3 = 0.5. A1 = A2 = 0.2 indicates that the influence of the temperature Tm is larger than the influence of the temperature Tt in the upper layer portion. This indicates that 80% of the upper layer is close to the temperature Tm, and 20% is close to the temperature Tt. The same applies to the middle layer portion. In the lower layer part, it shows that the influence of temperature Tn and Tb is the same.

A hot water supply heat load measuring means 31 for measuring a hot water supply heat load when hot water is supplied to the hot water supply destination is provided at a location downstream of the mixing valve 34 in the hot water supply passage 17, and the heat consumption terminal Terminal thermal load measuring means 32 for measuring the terminal thermal load at 3 is also provided.
The hot water supply thermal load measuring means 31 and the terminal thermal load measuring means 32 are a load detection temperature sensor (not shown) for detecting the temperature of flowing hot water and heat medium, and a load for detecting the flow rate of hot water and heat medium. A flow rate sensor for detection (not shown) and the feed water temperature sensor Si are configured, and the operation control unit 5 detects a temperature detected by the temperature sensor for load detection, a detected flow rate of the flow sensor for load detection, and the feed water temperature sensor. The thermal load is detected based on the detected temperature of Si.

The operation control unit 5 controls the operation of the fuel cell 1 in a state where the cooling water circulation pump 15 is operated during the operation of the fuel cell 1, and the hot water circulation pump 19 and the heat medium circulation pump 21. In addition, by controlling the operation of each of the three-way valves 26 for switching the heating, a hot water storage operation for storing hot water in the hot water storage tank 2 and a heat medium supply operation for supplying a heat medium to the heat consuming terminal 3 are performed. ing.
In the first embodiment, the operation control unit 5 switches the water supply switching three-way valve 28 to the bypass water supply state when a hot water supply stop state heating process is performed as a water quality improvement process described later. When the hot water delivery stop state heating process is not executed, the water supply switching three-way valve 28 is switched to the normal water supply state.

  The operation control unit 5 performs the hot water storage operation when no operation command is issued from a terminal remote controller (not shown) for the heat consuming terminal 3, and in the hot water storage operation, the heat switching three-way valve 26 is moved to the heat switching operation. In order to adjust the hot water circulation amount so that the detected temperature of the hot water storage temperature sensor Sh becomes a preset target hot water storage temperature (for example, 60 ° C.) in the state where the medium is not heated, the hot water circulation pump 19 It is configured to control operation.

The operation control unit 5 performs the heat medium supply operation when the operation is instructed from the terminal remote controller. In the heat medium supply operation, the heating switching three-way valve 26 is set to the heat medium heating state. In the switched state, the heat medium circulation pump 21 is operated at a preset rotational speed, and the hot water circulation amount is adjusted so that the detected temperature of the hot water storage temperature sensor Sh becomes the target hot water storage temperature. The operation of the hot water circulating pump 19 is controlled. The operation control unit 5 is configured to switch the heat medium circulation switching three-way valve 30 to the normal flow state while executing the heat medium supply operation.
The operation control unit 5 switches the heating switching three-way valve 26 to the heating medium non-heating state when an instruction to stop the operation is given from the terminal remote controller during the heating medium supply operation. By stopping the heat medium circulation pump 21, the heat medium supply operation is switched to the hot water storage operation.

The operation control unit 5 monitors the detected temperature of the cooling water return temperature sensor Sr during the operation of the fuel cell 1, and activates the radiator 33 when the detected temperature becomes higher than the set return allowable temperature. The cooling water is cooled.
For example, when the amount of hot water stored in the hot water storage tank 2 is full and the hot water storage heat exchanger 22 does not cool the cooling water to the set return allowable temperature due to heat exchange with the hot water from the hot water storage tank 2, The radiator 33 is operated to forcibly cool the cooling water returning to the fuel cell 1.

Next, control of the operation of the fuel cell 1 by the operation control unit 5 will be described.
The operation control unit 5 determines the output form of the power of the fuel cell 1 with respect to the predicted power load or the fuel cell 1 based on the time-series predicted power load and the time-series predicted heat load at the start of the operation cycle. The driving merit of each of the plural driving modes with different driving time zones is obtained, the driving mode having the highest driving merit is determined as the driving mode of the fuel cell 1, and the fuel is operated in the determined driving mode. The battery 1 is configured to operate.
For example, the operation cycle is set to 1 day, and a plurality of unit times constituting the operation cycle are set to 1 hour. Further, as the operation merit, a predicted energy reduction amount that is expected to be obtained by operating the fuel cell 1 is obtained.

The process for obtaining the time-series predicted power load and the time-series predicted heat load by the operation control unit 5 will be described. Incidentally, the heat load includes a hot water supply heat load when hot water is supplied to the hot water supply destination and a terminal heat load at the heat consuming terminal 3.
The operation control unit 5 stores the actual power load data, the actual hot water supply heat load data, and the actual terminal heat load data in the memory in association with the operation cycle and the unit time, so that past time series power load data and The past time-series heat load data is configured to be managed in association with each unit time for each operation cycle over a set period (for example, four weeks before the operation day).
Incidentally, the actual power load is measured based on the measured value of the power load measuring means 11 and the output value of the inverter 6, and the actual hot water supply heat load is measured by the hot water supply heat load measuring means 31, and the actual terminal heat load is measured. Is measured by the terminal thermal load measuring means 32.

  And the said operation control part 5 is for continuous prediction based on the management data of the time series past electric power load data and the time series past heat load data at the start time (for example, 3:00 am) of the operation cycle. Time-series predicted thermal load data and time-series predicted power load data of the first operation cycle of the set number of operation cycles (for example, 3 times), and the first of the operation cycles of the set number of times for prediction The time-series predicted heat load data of the operation cycle subsequent to the operation cycle is obtained by being divided for each unit time. Incidentally, the time-series predicted heat load data is data obtained by adding the time-series predicted hot water supply heat load data and the time-series predicted terminal heat load data. In this embodiment, the heat load state Will be described as a case where no terminal heat load is generated in the heat consuming terminal 3 and only a hot water supply heat load is generated.

A description will be given of the plurality of types of operation modes.
The plurality of types of operation modes include a continuous operation mode in which the fuel cell 1 is continuously operated during the operation cycle, and an intermittent operation mode in which the fuel cell 1 is operated intermittently during the operation cycle. As modes, there are included a plurality of types of operation modes in which the power output mode of the fuel cell 1 with respect to the predicted power load is different. As the intermittent operation mode, the power output mode of the fuel cell 1 with respect to the predicted power load or the fuel cell 1 A plurality of types of driving modes with different driving time zones are included.

  As the plurality of types of continuous operation modes, a load following continuous operation mode for causing the power generation output of the fuel cell 1 to follow the predicted power load in the entire time period of the operation cycle, a part of the plurality of unit times of the operation cycle A suppression continuous operation mode in which the power generation output of the fuel cell 1 is set to a setting suppression output smaller than the predicted power load in a unit time and the power generation output of the fuel cell 1 follows the prediction power load in the remaining unit time; and The power generation output of the fuel cell 1 is set to be a set increase output larger than the predicted power load in a part of the plurality of unit times of the operation cycle, and the power generation output of the fuel cell 1 is set in the remaining unit time. A forced continuous operation mode that follows the predicted power load is included.

  Further, when the fuel cell 1 is operated in the load follow-up continuous operation mode, the hot water storage tank 2 in the plurality of unit times when the suppression continuous operation mode is set as the set suppression output. Of the unit time before the unit time in which the excess heat state occurs when there is a unit time in which the excess heat state in which the predicted hot water storage amount is equal to or greater than the preset upper limit hot water storage amount in the hot water tank 2 Thus, the unit time when the excess heat state is eliminated and the predicted energy reduction amount is the largest is determined, and the forced continuous operation mode sets the unit time for the set increase output as the load following continuous operation mode. When the fuel cell 1 is operated, a unit time during which a shortage of heat occurs in which the predicted amount of stored hot water in the hot water tank 2 is insufficient with respect to the predicted heat load during a plurality of unit times of the operation cycle. When standing, among the previous unit time than the unit time the thermal insufficiency occurs, and the predicted energy reductions the thermal insufficiency is resolved is what is provided for in most larger unit time.

The predicted amount of stored hot water in the hot water tank 2 is the amount of heat that is predicted to be stored in the hot water tank 2 as hot water, and the predicted amount of stored hot water (kcal / h) for each unit time is expressed by the following equations 2 and 3. Desired. In each equation, the subscript “n” indicates the order of unit times in the operation cycle. For example, when n = 1, the first unit time in the operation cycle is indicated.
However, the predicted hot water storage amount 0 as the predicted hot water storage amount n-1 in equation 2 when n = 1 is the predicted hot water storage amount at the start of the operation cycle, and is a value obtained based on the above equation 1. The

Predicted hot water storage amount n = (Predicted hot water storage amount n-1−Predicted heat load n + Predicted heat output n) × (1-tank heat dissipation rate) (Equation 2)
Predicted heat output n = α × {(predicted power output n ÷ battery power generation efficiency) × battery heat efficiency} + surplus power × α × β-base heat dissipation amount (Equation 3)

However,
The tank heat dissipation rate is a heat dissipation rate from the hot water storage tank 2 and is set in advance.
The battery power generation efficiency indicates the ratio of the power generation output (kWh) to the unit energy consumption (kWh) in the fuel cell 1, and the battery thermal efficiency is the ratio of the generated heat amount (kWh) to the unit energy consumption (kWh) in the fuel cell 1. These battery power generation efficiency and battery thermal efficiency are set according to the power generation output.
In this cogeneration system, the base heat release amount is the amount of heat radiated without being used for hot water storage in the hot water storage tank 2 and heating by the heat consuming terminal 3 out of the generated heat amount of the fuel cell 1. .
The surplus power is obtained by subtracting the predicted power load from the predicted power output when the predicted power output is larger than the predicted power load.
For example, when the predicted power load is smaller than the minimum output of the fuel cell 1, the surplus power is obtained by subtracting the predicted power load from the minimum output of the fuel cell 1. As will be described later, when the power generation output of the fuel cell 1 is set to a set increase output larger than the main output following the predicted power load, the surplus power is obtained by subtracting the predicted power load from the set increase output. Desired. When the predicted power load is smaller than the minimum output of the power generation output adjustment range, the minimum output is the main output, and when the predicted power load is larger than the maximum output of the power generation output adjustment range, the maximum output is power. Main output.
α is a coefficient set to 860 as described above.
β is a heater efficiency that is an efficiency when the electric heater 12 converts surplus power (kWh) into heat (kWh), and is set in advance.

  As the plurality of types of intermittent operation modes, the unit time for causing the power generation output of the fuel cell 1 to follow the predicted power load is the operation time zone, and the predicted energy reduction amount is the largest among the plurality of unit times of the operation cycle. A plurality of unit times of the operation cycle, wherein the load follow-up intermittent operation mode determined for the unit time to be increased, the unit time for adjusting the power generation output of the fuel cell 1 to a setting suppression output smaller than the predicted power load is the operation time zone The controlled intermittent operation mode determined at the unit time in which the predicted energy reduction amount is the largest among the above, and the unit time for adjusting the power generation output of the fuel cell 1 to a set increase output larger than the predicted power load, The forced intermittent operation mode defined as the unit time in which the predicted energy reduction amount is the largest among the plurality of unit times of the operation cycle is included.

Further, as the load following intermittent operation mode, the predicted energy reduction amount based on the predicted power load and the predicted heat load in the operation cycle that defines the unit time for causing the power generation output of the fuel cell 1 to follow the predicted power load is the largest. A single-cycle-compatible load-following intermittent operation mode that is defined as a unit time that increases, and a unit time that causes the power generation output of the fuel cell 1 to follow the predicted power load, a predicted power load and a predicted heat load in the operation cycle that define the unit time In addition, a load follow intermittent operation mode corresponding to a plurality of cycles, which is defined as a unit time in which the predicted energy reduction amount based on the predicted heat load in the subsequent operation cycle becomes the largest, is included.
As the suppression intermittent operation mode, a unit time for adjusting the power generation output of the fuel cell 1 to the set suppression output is a unit in which the predicted energy reduction amount based on the predicted power load and the predicted heat load in the operation cycle that determines the unit time is the largest. Single cycle-compatible suppression intermittent operation mode determined in time, unit time for adjusting the power generation output of the fuel cell 1 to the set suppression output, the predicted power load and predicted heat load in the operation cycle for determining the unit time, and subsequent operation And a multi-cycle compatible intermittent intermittent operation mode defined in a unit time in which the predicted energy reduction amount based on the predicted heat load in the cycle is the largest.
As the forced intermittent operation mode, the unit time for adjusting the power generation output of the fuel cell 1 to the set increased output is the unit in which the predicted energy reduction amount based on the predicted power load and the predicted heat load in the operation cycle that determines the unit time is the largest. Single cycle-compatible forced intermittent operation mode determined in time, unit time for adjusting the power generation output of the fuel cell 1 to the set increase output, predicted power load and predicted heat load in the operation cycle for determining the unit time, and subsequent operation And a multiple cycle-compatible forced intermittent operation mode defined in a unit time in which the predicted energy reduction amount based on the predicted thermal load in the cycle is the largest.

  In this embodiment, since the operation cycle is set to one day, the single cycle correspondence type of each of the load following intermittent operation mode, the suppression intermittent operation mode, and the forced intermittent operation mode is described as a one-day correspondence type. In addition, the load following intermittent operation mode, the suppression intermittent operation mode, and the forced intermittent operation mode, each of which corresponds to a plurality of cycles, is a two-day response type in which the subsequent operation cycle is one time, and a subsequent operation cycle is two times. 3 day compatible type is included.

Hereinafter, the forced continuous operation mode and the setting increase output in each of the forced intermittent operation modes of the one day correspondence type, the two day correspondence type, and the three day correspondence type, and the suppression continuous operation mode and the one day correspondence type, 2 A setting suppression output setting method in each of the suppression correspondence intermittent operation modes of the day correspondence type and the three day correspondence type will be described.
A temporary setting output for increasing output setting or suppressing output setting is set stepwise (for example, at an interval of 0.05 kW) within the power generation output adjustment range (for example, 0.25 to 0.75 kW) of the fuel cell 1, For each temporarily set output, when the power generation output of the fuel cell 1 is adjusted to the temporarily set output, the generated heat amount (kW) at the time of output increase generated from the fuel cell 1 is obtained by the following equation 4, and the temporarily set output is determined as the fuel. A difference in energy consumption for power generation (kW) at the time of output suppression, which is a difference in energy consumption between the case where it is obtained from the battery 1 and the case where it is obtained from the commercial power source 7, is obtained by the following equation 5 And the energy amount difference for power generation at the time of output suppression is associated with each temporarily set output and stored in the memory.

Amount of heat generated when output increases = (temporary setting output ÷ battery power generation efficiency) x battery thermal efficiency (Equation 4)
Energy amount difference for power generation when output is suppressed = Temporary setting output ÷ Battery power generation efficiency-Temporary setting output ÷ Commercial power generation efficiency ............... (Formula 5)
However, the commercial power generation efficiency is the ratio of the power generation output (kWh) to the unit energy consumption (kWh) in the commercial power supply 7.

  Incidentally, since the commercial power generation efficiency is greater than the battery power generation efficiency, the difference in energy amount for power generation during output suppression is obtained as a negative value. Therefore, the smaller the absolute value of the energy amount difference during power suppression during output suppression, the smaller the energy This is advantageous in terms of consumption.

  And the said operation control part 5 sets the thing with the largest calorie | heat amount at the time of an output increase as a setting increase output among temporary setting outputs larger than an electric main output about each unit time of an operation cycle, Among the temporarily set outputs that are smaller, the output absolute value of the difference in energy amount for power generation at the time of output suppression is set as the setting suppression output.

Next, a description will be given of processing for obtaining the predicted energy reduction amount for each of the plurality of types of operation modes by the operation control means 5.
The predicted energy reduction amount in each operation mode is obtained by subtracting the energy consumption amount when the fuel cell 1 is operated in each operation mode from the energy consumption amount when the fuel cell 1 is not operated as shown in Equation 6 below. To calculate.

  Predicted energy reduction amount P = energy consumption amount E1 when the fuel cell 1 is not operated E1-energy consumption amount E2 when the fuel cell 1 is operated (formula 6)

The energy consumption E1 (kWh) when the fuel cell 1 is not operated is the commercial power when the predicted power load of the first operation cycle is supplemented with the received power from the commercial power supply 7 as shown in the following formula 7. It is obtained as the sum of the energy consumption amount in the power source 7 and the energy consumption amount when all of the predicted heat load of the first operation cycle is supplemented with the generated heat of the hot water supply auxiliary heater 24 or the heating medium auxiliary heater 25.
In other words, the energy consumption E1 in the case where the fuel cell 1 is not operated is obtained in the same manner regardless of the expected energy reduction amount in any operation mode.

  E1 = Predicted power load / commercial power generation efficiency + Predicted heat load / Auxiliary heater thermal efficiency (Equation 7)

However,
The predicted heat load is a value converted into kWh.
The auxiliary heater thermal efficiency is the ratio of the amount of heat generated (kWh or kcal) to the unit energy consumption (kWh or kcal) in the hot water supply auxiliary heater 24 or the heating medium auxiliary heater 25.

  On the other hand, the energy consumption E2 (kWh) when the fuel cell 1 is operated is calculated by using the predicted power load and the predicted heat load in the first operation cycle as the predicted power output and the predicted power output of the fuel cell 1, as shown in the following Equation 8. The operating cycle energy consumption, which is the energy consumed by the fuel cell 1 when supplemented with heat output, and the predicted shortage power corresponding to the predicted power load minus the predicted power output are all received power from the commercial power source 7. The amount of energy consumed in the commercial power source 7 when supplemented and the amount of energy consumed when all of the predicted insufficient heat amount is supplemented with the heat generated by the auxiliary heater 24 for hot water supply or the auxiliary heater 25 for heating medium are obtained.

  E2 = Operating cycle energy consumption + predicted insufficient energy / commercial power generation efficiency + predicted insufficient heat / auxiliary heater thermal efficiency (Equation 8)

  However, the predicted insufficient heat amount is obtained by subtracting the predicted hot water storage amount for the unit time immediately before the unit time from the predicted heat load of the unit time for which the predicted insufficient heat amount is obtained, and is converted into a unit of kWh.

  The operation period energy consumption is obtained by calculating the energy consumption per unit time for operating the fuel cell 1 in each operation mode and integrating the obtained energy consumption per unit time in the following equation 9. Ask.

  Energy consumption = (power generation output ÷ battery power generation efficiency) ......... (Formula 9)

The predicted energy reduction amount in the load following continuous operation mode is obtained as follows.
The energy consumption amount of each unit time is obtained as the main output by the above formula 9, and the operation cycle energy consumption amount is obtained by integrating the obtained energy consumption amounts of each unit time, and the operation cycle energy consumption amount is calculated. Based on the above, an energy consumption amount E2 when the fuel cell 1 is operated is obtained by Expression 8. Then, based on the energy consumption amount E2 when the fuel cell 1 thus obtained is operated and the energy consumption amount E1 when the fuel cell 1 is not operated obtained by Equation 7, the predicted energy reduction amount is obtained by Equation 6. Find P.

The predicted energy reduction amount in the forced continuous operation mode is obtained when there is a heat shortage unit time that becomes a heat shortage state when the fuel cell 1 is operated in the load following continuous operation mode. So ask.
That is, one or more selected unit times prior to the heat shortage unit time among the plurality of unit times in the operation cycle (when there are multiple units, the one closest to the start point of the operation cycle) In a form in which a plurality of unit times are set as a forced operation time zone for adjusting the power generation output to the set increase output and a remaining unit time of the operation cycle is set as a main operation time zone for adjusting the power generation output to the main output, By changing the unit time to be selected as the forced operation time zone, all the temporary operation patterns for forced operation are formed, and the predicted energy reduction amount is calculated based on the above equations 6 to 8 for all the temporary operation patterns. Ask for.
It should be noted that the energy consumption per unit time in the forced operation time zone is obtained as a set power increase output by the above formula 9, and the power consumption output per unit time in the main operation time zone is calculated by the above formula 9. By obtaining the main output and integrating the obtained energy consumption for each unit time, the operation period energy consumption is obtained.

Then, a temporary operation pattern for forced operation that does not generate a surplus heat unit time and that has the maximum predicted energy reduction amount among all the temporary operation patterns for forced operation does not occur, and the calculated temporary operation pattern is obtained. If the heat shortage unit time does not occur, the temporary operation pattern for forced operation is set to the operation pattern of the forced continuous operation mode, and the predicted energy reduction amount of the temporary operation pattern for forced operation is predicted for the forced continuous operation mode. Calculated as energy savings.
In the temporary operation pattern for forced operation in which the excess heat unit time does not occur and the predicted energy reduction amount is maximum, when the heat shortage unit time still occurs, the above processing is performed until the heat shortage unit time does not occur. Will repeat.

The predicted energy reduction amount in the suppressed continuous operation mode is obtained when the unit time of heat surplus exists when the fuel cell 1 is operated in the load following continuous operation mode, and is obtained as follows.
That is, one or more selected units of the unit time before the heat surplus unit time (the one closest to the start point of the operation cycle when there are a plurality of unit times) in the operation cycle are selected or continuous. In the form of a plurality of unit times as a suppression operation time zone for adjusting the power generation output to the set suppression output and a remaining unit time of the operation cycle as a main operation time zone for adjusting the power generation output to the main output, By changing the unit time to be selected as the time zone for restraint operation, all the provisional operation patterns for restraint operation are formed, and the predicted energy reduction amount is calculated based on the above equations 6 to 8 for all the provisional operation patterns. Ask for.
It should be noted that the energy consumption per unit time in the restraint operation time zone is obtained as the set restraint output by the above equation 9, and the energy consumption per unit time in the main operation time zone is obtained by the above formula 9. By obtaining the main output and integrating the obtained energy consumption for each unit time, the operation period energy consumption is obtained.

Then, a temporary operation pattern for the suppressed operation that does not cause the heat shortage unit time among all the temporary operation patterns for the suppressed operation and has the maximum predicted energy reduction amount is obtained, and the unit time of the heat surplus in the obtained temporary operation pattern If this does not occur, the temporary operation pattern for the suppression operation is set as the operation pattern of the suppression continuous operation mode, and the predicted energy reduction amount of the temporary operation pattern for the suppression operation is obtained as the predicted energy reduction amount of the suppression continuous operation mode. .
In addition, in the temporary operation pattern for the suppression operation in which the heat shortage unit time does not occur and the predicted energy reduction amount is the maximum, when the heat surplus unit time still occurs, the above processing is performed until the heat surplus unit time does not occur. Will repeat.

The predicted energy reduction amount of the one-day type load following intermittent operation mode is obtained as follows.
Among the plurality of unit times of the operation cycle, the selected one or a plurality of continuous unit times are set as unit times constituting the operation time zone, and the remaining unit time of the operation cycle is stopped for stopping the fuel cell 1 By changing the unit time to be selected as the unit time constituting the operation time zone in the form of the unit time constituting the belt, all the temporary operation patterns are formed. All temporary operation patterns except for a pattern in which the entire unit time of the cycle is an operation time zone are stored in the memory as temporary operation patterns for intermittent operation.

Assuming that the fuel cell 1 is operated in a state where the power generation output is adjusted to the main output in the operation time zone set in each temporary operation pattern for each of the temporary operation patterns for all intermittent operations. A predicted energy reduction amount P is obtained based on the equations 6 to 8, and a predicted heat output and a predicted hot water storage heat amount are obtained for each unit time of the first operation cycle.
Note that the energy consumption per unit time included in the operation time zone is obtained by using the power generation output as the main output by the above formula 9, and the energy consumption per unit time not included in the operation time zone is set to 0. The operating period energy consumption is obtained by integrating the consumption.
Further, the predicted heat output of unit time not included in the operation time zone is 0, and the predicted hot water storage amount of unit time not included in the operation time zone is obtained by setting the predicted heat output n to 0 according to the above equation 2.

  Then, among all the intermittent operation patterns for intermittent operation, the temporary operation pattern for the intermittent operation with the maximum predicted energy reduction amount is obtained, and the temporary operation pattern for the intermittent operation is used as a one-day load following intermittent operation. The predicted energy reduction amount of the temporary operation pattern for the intermittent operation is obtained as the predicted energy reduction amount of the one day correspondence type load following intermittent operation mode.

The predicted energy reduction amount of the two-day load following intermittent operation mode is obtained as follows.
That is, among all temporary operation patterns for one-day type intermittent operation, when the power generation output is adjusted to the main output in the operation time period as described above, the predicted hot water storage of the last unit time in the first operation cycle A provisional operation pattern having a heat quantity greater than 0 is selected as a two-day provisional operation pattern.
Then, for all the two-day tentative operation patterns, assuming that the predicted hot water storage amount of the last unit time of the first operation cycle is used as the predicted heat load of the second operation cycle, a plurality of second operation cycles For each unit time, the predicted amount of stored hot water and the predicted amount of heat used as the predicted heat load are obtained.
The predicted amount of stored hot water in each unit time is obtained by the above formula 2 with the predicted heat output n set to zero.
Further, the predicted amount of heat used for each unit time is obtained by the following equations 10 to 12.

When the predicted hot water storage amount n-1 ≥ predicted heat load n,
Predicted heat consumption n = Predictive heat load n ... (Equation 10)
When the predicted hot water storage amount n-1 <predicted thermal load n,
Predicted heat consumption n = Predicted hot water storage amount n-1 ... (Equation 11)
When the predicted hot water storage amount n-1 = 0,
Predicted heat consumption n = 0 ......... (Formula 12)

For each of the two-day tentative temporary operation patterns, the predicted use heat amount (converted into kWh) in the second operation cycle is converted into the predicted energy reduction amount of the one-day responsive load follow-up intermittent operation mode obtained as described above. Is calculated by adding the energy consumption (total predicted use heat amount / auxiliary heater thermal efficiency) in the case of supplementing the total of the generated heat with the generated heat of the hot water supply auxiliary heater 24, and the calculated predicted energy The amount of energy reduction per one operation cycle (one day) divided by 2 is set as the predicted energy reduction amount of the temporary operation pattern corresponding to the two-day type.
Then, among all the two-day type temporary operation patterns, the two-day type temporary operation pattern having the maximum predicted energy reduction amount is set as the operation pattern of the two-day type load follow-up intermittent operation mode, The predicted energy reduction amount of the 2-day correspondence type temporary operation pattern is obtained as the predicted energy reduction amount of the 2-day correspondence type load following intermittent operation mode.

The predicted energy reduction amount of the three-day load following intermittent operation mode is obtained as follows.
That is, out of all the two-day provisional operation patterns, the temporary operation pattern in which the predicted hot water storage heat amount in the final unit time in the second operation cycle is larger than 0 is selected as the three-day correspondence temporary operation pattern, For all of the three-day provisional operation patterns, assuming that the predicted hot water storage amount of the last unit time of the second operation cycle is used as the predicted heat load of the third operation cycle, Similarly to the above, the predicted amount of stored hot water and the predicted amount of heat used are obtained for each of a plurality of unit times in the third operation cycle.

For each of the three-day tentative temporary operation patterns, the predicted energy consumption in the second and third operation cycles (to the predicted energy reduction amount of the one-day responsive load following intermittent operation mode obtained as described above) ( The predicted energy reduction amount is obtained by adding the energy consumption (total predicted heat consumption / auxiliary heater thermal efficiency) in the case of supplementing the total of kWh) with the generated heat of the hot water supply auxiliary heater 24. The predicted energy reduction amount obtained by dividing the predicted energy reduction amount by 3 to obtain the energy reduction amount per one operation cycle (one day) is set as the predicted energy reduction amount of the temporary operation pattern corresponding to the three days.
Then, among all the three-day type temporary operation patterns, the three-day type temporary operation pattern having the maximum predicted energy reduction amount is set as the operation pattern of the three-day type load following intermittent operation mode, The predicted energy reduction amount of the three-day correspondence type temporary operation pattern is obtained as the predicted energy reduction amount of the three-day correspondence type load following intermittent operation mode.

The predicted energy reduction amount of the one-day type forced intermittent operation mode is obtained as follows.
That is, for each of the intermittent operation patterns for intermittent operation, assuming that the fuel cell 1 is operated in a state in which the power generation output is adjusted to the set increase output in the operation time zone set in each temporary operation pattern, A predicted energy reduction amount P is obtained based on the above equations 6 to 8, and further, a predicted heat output and a predicted hot water storage heat amount are obtained for each unit time of the first operation cycle.
The energy consumption per unit time included in the operation time zone is obtained by setting the power generation output as a set increase output according to the above equation 9, and the energy consumption per unit time not included in the operation time zone is set to 0. The operating period energy consumption is obtained by integrating the consumption.

  Then, among all the intermittent operation patterns for intermittent operation, the temporary operation pattern for intermittent operation with the maximum predicted energy reduction amount is obtained, and the temporary operation pattern for intermittent operation is used as a one-day type forced intermittent operation mode. And the predicted energy reduction amount of the temporary operation pattern for the intermittent operation is obtained as the predicted energy reduction amount of the one-day type forced intermittent operation mode.

  The operation pattern and the predicted energy reduction amount of the two-day type forced intermittent operation mode are obtained by the same procedure as the procedure for obtaining the operation pattern and the predicted energy reduction amount of the two-day type load follow-up intermittent operation mode, and Since the operation pattern and the predicted energy reduction amount of the three-day compatible forced intermittent operation mode are obtained in the same procedure as the procedure for calculating the operation pattern and the predicted energy reduction amount of the three-day corresponding load follow-up intermittent operation mode. Description of the operation pattern and the predicted energy reduction amount of the 2-day type forced intermittent operation mode, and the procedure for obtaining the operation pattern and the predicted energy reduction amount of the 3-day type forced intermittent operation mode will be omitted.

The predicted energy reduction amount of the one day correspondence type suppression intermittent operation mode is obtained as follows.
That is, for each of the temporary operation patterns for intermittent operation, assuming that the fuel cell 1 is operated in a state in which the power generation output is adjusted to the set suppression output in the operation time period set in each temporary operation pattern, A predicted energy reduction amount P is obtained based on the equations 6 to 8, and further, a predicted heat output and a predicted hot water storage amount are obtained for each unit time of the first operation cycle.
The energy consumption per unit time included in the operation time zone is obtained by setting the power generation output as the setting suppression output by the above-mentioned formula 9, and the energy consumption amount per unit time not included in the operation time zone is set to 0. The operating period energy consumption is obtained by integrating the consumption.

  Then, among all the intermittent operation patterns for intermittent operation, a temporary operation pattern for intermittent operation with the maximum predicted energy reduction amount is obtained, and the temporary operation pattern for intermittent operation is used as a one-day suppression type intermittent intermittent operation mode. The predicted energy reduction amount of the temporary operation pattern for the intermittent operation is obtained as the predicted energy reduction amount of the one day correspondence type suppression intermittent operation mode.

  The operation pattern and the predicted energy reduction amount of the two-day correspondence type intermittent intermittent operation mode are obtained by the same procedure as the procedure for obtaining the operation pattern and the predicted energy reduction amount of the two-day type load follow-up intermittent operation mode, and Since the operation pattern and the predicted energy reduction amount of the 3-day response type intermittent intermittent operation mode are obtained in the same procedure as the procedure for obtaining the operation pattern and the predicted energy reduction amount of the 3-day response type load following intermittent operation mode. The description of the operation pattern and the predicted energy reduction amount of the two-day response type intermittent intermittent operation mode and the procedure for obtaining the operation pattern and the predicted energy reduction amount of the three-day type suppression intermittent operation mode are omitted.

  When the excess heat unit time exists, the operation control unit 5 obtains the predicted energy reduction amount of the load following continuous operation mode and the predicted energy reduction amount of the suppression continuous operation mode as described above, and the heat shortage unit. If time exists, as described above, obtain the predicted energy reduction amount of the load following continuous operation mode and the predicted energy reduction amount of the forced continuous operation mode, and further, as described above, the one-day type, the two-day type Predictive energy reduction amount of load following intermittent operation mode of each type and 3-day type, predicted energy reduction amount of forced intermittent operation mode of 1-day type, 2-day type and 3-day type, and 1-day type Nine predictive energy reduction amounts for each of the two-day type and three-day type restraint intermittent operation modes are obtained, and the operation type having the maximum predicted energy reduction amount is determined as fuel. Battery 1 Rolling defined form, to operate the fuel cell 1 at its-determined operating configuration.

When the operation mode of the fuel cell 1 is set to the load-following continuous operation mode, the current power load following operation is performed to cause the power generation output of the fuel cell 1 to follow the current power load currently requested over the entire time period of the operation cycle. To do.
In the current power load following operation, the main power output that continuously follows the current power load within the range from the minimum output to the maximum output is obtained for each relatively short predetermined output adjustment period such as one minute. And the power generation output of the fuel cell 1 is adjusted to the determined main output.
The current power load is measured based on the measured value of the power load measuring means 11 and the output value of the inverter 6, and the current power load is measured at a predetermined sampling time (for example, in the previous output adjustment cycle). It is obtained as an average value of data sampled at 5 seconds).

When the operation mode of the fuel cell 1 is set to the suppression continuous operation mode, the power generation output of the fuel cell 1 is adjusted to the setting suppression output in the unit time determined to set the power generation output of the fuel cell 1 to the setting suppression output, Current power load following operation is executed in other unit time.
When the operation mode of the fuel cell 1 is set to the forced continuous operation mode, the power generation output of the fuel cell 1 is adjusted to the set increase output in the unit time determined to set the power generation output of the fuel cell 1 to the set increase output, Current power load following operation is executed in other unit time.

Even if the operation mode of the fuel cell 1 is determined to be any one of the load follow-up intermittent operation of the one-day correspondence type, the two-day correspondence type, and the three-day correspondence type, the current power load follow-up operation is performed in the unit time included in the operation time zone. The fuel cell 1 is stopped during the unit time included in the stop time zone.
Regardless of whether the operation mode of the fuel cell 1 is set to one-day, two-day, or three-day restrained intermittent operation, the power generation output of the fuel cell 1 is set in the unit time included in the operation time zone. The fuel cell 1 is stopped during the unit time included in the stop time zone by adjusting to the suppression output.
Regardless of whether the operation mode of the fuel cell 1 is set to one-day type, two-day type, or three-day type forced intermittent operation, the power generation output of the fuel cell 1 is set in the unit time included in the operation time zone. The fuel cell 1 is stopped during the unit time included in the stop time zone by adjusting to the increased output.

Next, a process for determining whether or not a water quality improvement process for suppressing deterioration in the quality of hot water in the hot water tank 2 will be described.
The operation control unit 5 includes a first set allowable time as a low temperature allowable time as a first non-low temperature continuous time in which the temperature in the set low temperature range is not detected by the tank upper hot water temperature sensor St. If it becomes above, it is comprised so that the water quality improvement process for suppressing the water quality fall of the said hot water storage tank 2 may be performed.
In other words, the operation control unit 5 starts measuring the first duration when the detected temperature of the tank upper hot water temperature sensor St becomes higher than the set low temperature range, and the detected temperature of the tank upper hot water temperature sensor St becomes the set low temperature. When the temperature is within the range, the first duration time is measured in a state where the first duration time is reset to 0, and the water quality improvement processing is performed at the water quality improvement processing timing at which the first duration time is equal to or longer than the first set allowable time. Is configured to run.

The set low temperature range is set to a range lower than the determination reference temperature at which the hot water supply auxiliary heater 24 performs the heating operation. As described above, the determination reference temperature is set to a temperature obtained by adding a set increase temperature (for example, 5 ° C.) to the lower limit value (for example, 32 ° C.) of the temperature range that can be commanded by the operation remote controller R.
That is, when the temperature of the hot water is in the range below the determination reference temperature, the hot water is heated to the heating reference temperature (for example, 60 ° C.) by the hot water supply auxiliary heater 24 to improve the water quality. The low temperature range is set to a range lower than the determination reference temperature at which the hot water supply auxiliary heater 24 performs the heating operation.

Further, the operation control unit 5 sets a temperature within a set high temperature range, which is predicted as the temperature of hot water when heated in the hot water storage heat exchanger 22 and then exists in the hot water storage tank 2, to the bottom of the tank. It is configured to execute the water quality improvement process when the second continuous time for continuing the state not detected by the hot water temperature sensor Sb is equal to or longer than the second set allowable time, and the water quality improvement process is performed. Along with execution, the first duration time and the second duration time are reset to zero.
In other words, the operation control unit 5 starts measuring the second duration when the temperature detected by the bath bottom hot water temperature sensor Sb is lower than the set high temperature range, and the temperature detected by the bath bottom hot water temperature sensor Sb is the set high temperature. The second duration time is measured in a state where the second duration time is reset to 0 when the temperature falls within the range, and the water quality improvement process is executed when the second duration time exceeds the second set allowable time. ing.

The set high temperature range is set to a temperature range of 60 ° C. or more, for example.
The first setting allowable time is set to 96 hours, for example, and the second setting allowable time is also set to 96 hours, for example.

Next, the water quality improvement process will be described.
As the water quality improvement process, the operation control unit 5 switches the water supply switching three-way valve 28 to the tank bypass water supply state, that is, the hot water supply stop state, and the detected temperature of the hot water storage temperature sensor Sh is the target hot water storage temperature. The hot water circulation pump 19 is operated so as to reach a temperature, and the hot water delivery stop state heating process for heating the heating unit H is executed.

In other words, when the fuel cell 1 is operated, the cooling water recovered from the heat generated by the fuel cell 1 is supplied to the hot water storage heat exchanger 22, and the hot water storage heat exchanger 22 is heated. Since the heating section H is heated, when the hot water delivery stop state heating process is executed, the scheduled operation time zone in which the fuel cell 1 is operated in the operation mode determined as described above and the operation mode thereof are used. The fuel cell 1 is operated regardless of the scheduled operation stop time zone in which the operation of the fuel cell 1 is stopped.
Incidentally, in the first embodiment, in the hot water supply stop state heating process, the fuel cell 1 is configured to be operated in the current power load following operation in which the power generation output follows the current power load currently requested. Yes.
That is, the operation control unit 5 switches the hot water circulation pump 19 so that the detected temperature of the hot water storage temperature sensor Sh becomes the target hot water storage temperature with the water supply switching three-way valve 28 switched to the tank bypass water supply state. The hot water supply stop state heating process is executed in a form in which the fuel cell 1 is operated and the fuel cell 1 is driven to follow the current power load.

By the way, when the temperature detected by the tank bottom temperature sensor Sb reaches the temperature in the set high temperature range, the whole or substantially the entire hot water tank 2 is filled with hot water heated by the hot water storage heat exchanger 22. Therefore, when the temperature detected by the tank bottom temperature sensor Sb reaches a temperature in the set high temperature range, it is determined that the end condition for ending the hot water supply stop state heating process as the water quality improvement process is satisfied.
That is, the operation control unit 5 performs the hot water supply stop state heating process until the temperature detected by the tank bottom temperature sensor Sb reaches the set high temperature range and satisfies the termination condition, and the tank bottom temperature sensor Sb. When the detected temperature reaches a temperature in the set high temperature range and the end condition is satisfied, the fuel cell 1 is stopped, the hot water supply stop state heating process is ended, and the fuel cell 1 is operated until the start of the next operation cycle. Configured to wait.

  When the hot water tap is opened while the hot water delivery stop state heating process is being performed, water is supplied to the hot water supply passage 17 through the tank bypass water supply passage 27, and the water is supplied to the hot water supply auxiliary heater 24. Thus, the hot water in the hot water storage tank 2 is not supplied to the hot water supply destination until the hot water delivery stop state heating process is completed.

Hereinafter, based on a flowchart, the control operation of the operation control unit 5 will be described.
First, the control operation of the entire cogeneration system will be described based on the flowchart shown in FIG.
When it is determined in step # 1 that the operation cycle has started, an operation mode setting process is executed to determine the operation mode of the fuel cell 1, and the fuel cell 1 is operated in the determined operation mode. Operation processing is executed (steps # 2 and # 3).

  In the operation mode setting process, when the predicted energy reduction amount of any one of the intermittent operation modes is the maximum among all the operation modes including the multiple types of continuous operation modes and the multiple types of intermittent operation modes, the operation is performed. The heat load coverage rate U / L indicating the extent to which the amount of stored hot water at the start of the cycle can cover the predicted heat load of the operation cycle is compared with the set value K, and the heat load coverage rate U / L is greater than the set value K. Is determined to satisfy the standby condition, the operation mode of the fuel cell 1 is determined as a standby mode in which the fuel cell 1 is stopped over the entire time period of the operation cycle, and the thermal load coverage ratio U / L is equal to or less than the set value K. In this case, it is determined that the standby condition is not satisfied, and the operation mode of the fuel cell 1 is determined to be the intermittent operation mode with the maximum predicted energy reduction amount.

Incidentally, L of the thermal load coverage ratio U / L is the predicted heat load of the operation cycle obtained by summing the predicted heat loads of each unit time of the first operation cycle.
Moreover, U of the thermal load coverage ratio U / L is predicted to be covered by the amount of stored hot water at the start of the first operation cycle out of the predicted heat load of the first operation cycle, assuming the predicted heat output of the fuel cell 1 as 0. Predicted amount of heat used.
For example, when the start time of the first operation cycle corresponds to the start time of the second operation cycle of any one of the two-day load following intermittent operation mode, forced intermittent operation mode and suppressed intermittent operation mode, L is a value obtained by summing the predicted heat load of each unit time of the second operation cycle, and U is a value obtained by summing the predicted heat usage of each unit time of the second operation cycle.
The set value K is set to 0.4, for example.

  That is, the operation mode setting process is executed every time when the operation cycle starts, and in the operation mode setting process, as described above, the thermal load coverage ratio U / L is larger than the set value K and satisfies the standby condition. Since it is configured to set the standby mode when it is determined, in the previous driving mode setting process, either the two-day type or the three-day type load tracking, suppression or forced intermittent mode of operation When the time when the current driving mode setting process is performed corresponds to the start time of the second driving cycle in the 2-day compatible type or the 3-day compatible type intermittent driving mode, When the standby mode is set as described above, the fuel cell 1 is stopped over the entire time period of the second operation cycle in the 2-day-compatible or 3-day intermittent operation mode. Intermittent type or 3-day type Rolling form is continued.

  If it is determined in step # 1 that it is not the start point of the operation cycle, a duration measurement process for measuring the first duration and the second duration is executed (step # 4), and the first duration t1 is the first duration. When it is smaller than the set allowable time L1 and the second duration t2 is smaller than the second set allowable time L2, the fuel cell operation process is continued and the process returns (steps # 5, 6, 3).

  When the first duration t1 is equal to or longer than the first set allowable time L1, or when the second duration t2 is equal to or longer than the second set allowable time L2, the temperature detected by the tank bottom temperature sensor Sb becomes a temperature within the set high temperature range. Until the end condition is satisfied, the hot water delivery stop state heating process is executed as the water quality improvement process, and when the detected temperature of the tank bottom temperature sensor Sb reaches the set high temperature range and the end condition is satisfied, the first duration t1 The second duration t2 is reset to 0, the fuel cell 1 is stopped, the operation of the fuel cell 1 is waited until the next operation cycle starts, and the next operation cycle starts (step) # 5-11) Returning to step # 2, the operation mode setting process is executed.

Next, the duration measurement process will be described based on the flowchart shown in FIG.
The first duration t1 in which the temperature in the set low temperature range is not detected by the tank upper hot water temperature sensor St, that is, the detected temperature Tt of the tank upper hot water temperature sensor St is higher than the upper limit temperature Rt in the set low temperature range. When the first duration measuring timer for measuring the temperature is not in operation, it is determined whether or not the detected temperature Tt of the tank upper hot water temperature sensor St is higher than the upper limit temperature Rt of the set low temperature range. The measurement of the first duration t1 is started by operating the duration measurement timer, and when the first duration measurement timer is operating, the measurement of the first duration t1 is continued (steps # 21 to 23).

  Subsequently, in step # 24, it is determined whether or not the detected temperature Tt of the tank upper hot water temperature sensor St is equal to or lower than the upper limit temperature Rt of the set low temperature range. If the following, the first duration time t1 is determined in step # 25. Is reset to 0, and if not, measurement of the first duration t1 by the first duration measurement timer is continued.

  Subsequently, the second continuation time in which the temperature in the set high temperature range is not detected by the tank bottom temperature sensor Sb, that is, the detection temperature Tb of the tank bottom temperature sensor Sb is lower than the lower limit temperature Rb in the set high temperature range. When the second duration measuring timer for measuring t2 is not in operation, it is determined whether or not the detected temperature Tb of the tank bottom temperature sensor Sb is lower than the lower limit temperature Rb of the set high temperature range. The measurement of the second duration t2 is started by operating the duration measurement timer, and when the second duration measurement timer is operating, the measurement of the second duration t2 is continued (steps # 26 to 28).

  Subsequently, in step # 29, it is determined whether or not the detected temperature Tb of the tank bottom temperature sensor Sb is equal to or higher than the lower limit temperature Rb of the set high temperature range. If so, the second duration t2 is set in step # 30. If it is not zero or more, the measurement of the second duration t2 by the second duration measurement timer is continued.

That is, when the detected temperature Tt of the tank upper hot water temperature sensor St becomes equal to or lower than the upper limit temperature Rt of the set low temperature range, the hot water supply auxiliary heater 24 is heated to the heating reference temperature that can improve the water quality by the heating operation. Therefore, when the detected temperature Tt of the tank upper hot water temperature sensor St becomes equal to or lower than the upper limit temperature Rt of the set low temperature range, the first duration t1 is reset to zero.
Further, when the detection temperature Tb of the tank bottom temperature sensor Sb is equal to or higher than the lower limit temperature Rb of the set high temperature range, the entire hot water tank 2 or substantially the whole is filled with hot water heated by the hot water storage heat exchanger 22. Since the hot water quality of the hot water storage tank 2 is in a good state, the second duration t2 is reset to 0 when the detected temperature Tb of the tank bottom temperature sensor Sb is equal to or higher than the lower limit temperature Rb of the set high temperature range. To do.

[Second Embodiment]
Hereinafter, although 2nd Embodiment is described, this 2nd Embodiment demonstrates another embodiment of the process which discriminate | determines the necessity for a water quality improvement process, and a water quality improvement process, Comprising: The whole cogeneration system Since the configuration is the same as that of the first embodiment, illustration and description of the overall configuration of the cogeneration system are omitted, and the processing for determining whether or not the water quality improvement processing is necessary and the water quality improvement processing will be mainly described.

First, processing for determining whether or not water quality improvement processing is necessary will be described.
As a plurality of hot water temperature detecting means for detecting the temperature of hot water in the hot water storage tank 2, a tank upper hot water temperature sensor St, an intermediate upper hot water temperature sensor Sm, an intermediate lower hot water temperature sensor Sn, and a tank similar to those in the first embodiment. A bottom hot water temperature sensor Sb is provided from the bottom to the top of the hot water tank 2.
The operation control unit 5 detects a state in which at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb detects a temperature higher than a set low temperature range determined in the same manner as in the first embodiment. When the water quality improvement processing timing at which the first continuous time to be continued is equal to or longer than the first set allowable time, the water quality improvement processing for suppressing the water quality deterioration of the hot water tank 2 is performed.
In other words, the operation control unit 5 starts measuring the first duration when at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb detects a temperature higher than the set low temperature range. When the detected temperatures of all the hot water temperature sensors St, Sm, Sn, Sb are within the set low temperature range, the first duration is measured in a state where the first duration is reset to 0, and When the first duration time is equal to or longer than the first set allowable time, the water quality improvement process is executed.

Further, the operation control unit 5 sets the plurality of temperatures lower than the set high temperature range predicted as the temperature of hot water when heated in the hot water storage heat exchanger 22 and then present in the hot water storage tank 2. When the second continuation time for continuing the state detected by at least one of the hot water temperature sensors St, Sm, Sn, and Sb is equal to or greater than the second set allowable time, the water quality improvement process is executed. And the first duration time and the second duration time are reset to 0 as the water quality improvement process is executed.
In other words, the operation control unit 5 starts measuring the second duration when at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb detects a temperature lower than the set high temperature range. When the detected temperatures of all the hot water temperature sensors St, Sm, Sn, and Sb are within the set high temperature range, the second duration time is measured in a state where the second duration time is reset to 0, and When the second duration time is equal to or longer than the second set allowable time, the water quality improving process is executed.

  Each of the first setting allowable time, the second setting allowable time, and the set high temperature range is set in the same manner as in the first embodiment.

Next, the water quality improvement process will be described.
The operation control unit 5 controls the operation of the hot water circulation pump 19 so as to reduce the hot water circulation amount in the hot water circulation circuit 18 as compared with the normal time or the hot water circulation in the hot water circulation circuit 18 as the water quality improvement process. Is configured to execute hot water replacement promotion processing for controlling the operation of the hot water circulation pump 19.

  During the operation of the fuel cell 1, the operation of the hot water circulation pump 19 is controlled so as to adjust the hot water circulation amount so that the temperature detected by the hot water storage temperature sensor Sh becomes the target hot water storage temperature. Therefore, by operating the fuel cell 1 so that its power generation output is smaller than the normal time when the fuel cell 1 is operated in the operation mode determined by the operation mode setting process, the heat output of the fuel cell 1 is normal. Therefore, the amount of heat supplied to the hot water storage heat exchanger 22 by the cooling water is less than normal, so the hot water circulation amount is adjusted so that the detected temperature of the hot water temperature sensor Sh becomes the target hot water temperature. Therefore, when the operation of the hot water circulation pump 19 is controlled, the hot water circulation amount in the hot water storage circulation path 18 is adjusted to be smaller than normal.

That is, the hot water replacement promotion process (hereinafter referred to as hot water replacement promotion process for reducing the circulation amount) in a form in which the operation of the hot water circulation pump 19 is controlled so as to reduce the hot water circulation amount in the hot water storage circuit 18 from the normal time. In some cases, the fuel cell 1 is operated so that its power generation output is smaller than normal, and the hot water is adjusted so that the hot water circulation amount is adjusted so that the detected temperature of the hot water temperature sensor Sh becomes the target hot water temperature. The operation is performed in such a manner that the operation of the circulation pump 19 is controlled.
By the way, the output reduction setting ratio for setting the power generation output for hot water replacement promotion processing is set to a value smaller than 1 (for example, 0.8) and set in the operation mode determined in the operation mode setting process. By multiplying the generated power output by the output reduction setting ratio, the power generation output for hot water replacement promotion processing is set. In the hot water replacement promotion processing for reducing the circulation amount, the power generation output for hot water replacement promotion processing is used. The fuel cell 1 is operated.
However, if the value obtained by multiplying the power generation output set in the operation mode determined in the operation mode setting process by the output reduction setting ratio is smaller than the minimum output in the power generation output adjustment range of the fuel cell 1, hot water The power generation output for replacement promotion processing is set to the minimum output.

  Further, when the circulation of hot water in the hot water storage circuit 18 is stopped, there is no cooling source for cooling the cooling water of the fuel cell 1 in the hot water storage heat exchanger 22, so the hot water circulation in the hot water storage circuit 18 should be stopped. The hot water replacement promotion process (hereinafter sometimes referred to as hot water replacement promotion process for stopping circulation) in the form of controlling the operation of the hot water circulation pump 19 stops the fuel cell 1 and the hot water storage circuit 18. The operation of the hot water circulation pump 19 is controlled so as to stop the hot water circulation in the water.

  And, when it is the scheduled operation time zone in the operation mode set in the operation mode setting process, the hot water / water replacement promotion process for reducing the circulation amount is executed, and when it is the scheduled operation stop time zone in the operation mode, The hot water replacement promotion process is executed.

For example, when the operation mode of the fuel cell 1 is set to the load following continuous operation mode, the power generation output for the hot water replacement promotion process is set by multiplying the current power load by the output reduction setting ratio to reduce the circulation amount. Execute hot water replacement promotion process.
When the operation mode of the fuel cell 1 is set to the forced continuous operation mode, the power generation output for hot water replacement promotion processing is set by multiplying the set increase output by the output decrease setting ratio in the forced operation time zone. Then, the hot water replacement promotion process for reducing the circulation rate is executed, and the power generation output for the hot water replacement promotion process is set in the time period for the main operation in the same manner as in the load following continuous operation mode to reduce the circulation rate. Execute hot water replacement promotion process.

When the operation mode of the fuel cell 1 is determined to be a one-day response type, a two-day response type, or a three-day response type load follow intermittent operation mode, the output is reduced to the current power load in the operation time zone in the first operation cycle. Multiply the setting ratio to set the power generation output for hot water replacement promotion processing, execute hot water replacement promotion processing for reducing the circulation amount, and promote hot water replacement for circulation stop in the stop time zone in the first operation cycle Execute the process.
When the operation mode of the fuel cell 1 is set to the 1-day compatible type, the 2-day compatible type, and the 3-day compatible type of intermittent intermittent operation mode, the output decreases to the set increase output in the operation time zone in the first operation cycle. Multiply the setting ratio to set the power generation output for hot water replacement promotion processing, execute hot water replacement promotion processing for reducing the circulation amount, and promote hot water replacement for circulation stop in the stop time zone in the first operation cycle Execute the process.

  When the operation mode of the fuel cell 1 is determined to be a two-day load following, forced and suppressed intermittent operation mode, in the second operation cycle, hot water replacement promotion processing for circulation stop is executed, When the operation mode of the battery 1 is determined as a three-day load following, forced and suppressed intermittent operation mode, in the second operation cycle and the third operation cycle, hot water replacement promotion processing for circulation stop is performed. Execute.

By the way, when all the detected temperatures of the plurality of hot water temperature sensors St, Sm, Sn, and Sb are within the set low temperature range, the water quality of the hot water in the hot water storage tank 2 can be improved by the heating operation of the hot water supply auxiliary heater 24. Since it can be heated to the heating reference temperature, when all the detected temperatures of the hot water temperature sensors St, Sm, Sn, and Sb are within the set low temperature range, the hot water replacement promoting process as the water quality improving process is finished. It is configured to determine that the condition is satisfied.
That is, the operation control unit 5 executes the hot water replacement promotion process until the detected temperatures of all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb become temperatures in the set low temperature range and satisfy the termination condition. When the detected temperature of all of the plurality of hot water temperature sensors St, Sm, Sn, Sb reaches the temperature in the set low temperature range and satisfies the end condition, the fuel cell 1 is stopped and the hot water replacement promotion process is ended. The operation of the fuel cell 1 is waited until the start of the operation cycle.

Hereinafter, based on a flowchart, the control operation of the operation control unit 5 will be described.
In FIG. 2, the control operation of the operation control unit 5 in the second embodiment is whether or not the duration measurement process in step # 4, the water quality improvement process in step # 7, and the end condition in step # 8 are satisfied. Since the control operation described in the first embodiment is the same except that the determination process is different, the differences from the first embodiment will be described.

In step # 7, hot water replacement promotion processing is executed as water quality improvement processing.
In step # 8, when all the detected temperatures of the plurality of hot water temperature sensors St, Sm, Sn, and Sb are within the set low temperature range, it is determined that the end condition is satisfied.

Hereinafter, the duration measurement process will be described based on the flowchart shown in FIG.
A first duration measurement timer for measuring a first duration t1 during which at least one detected temperature of the plurality of hot water temperature sensors St, Sm, Sn, Sb continues to be higher than the upper limit temperature of the set low temperature range operates. If not, it is determined whether at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb is higher than the upper limit temperature of the set low temperature range. The measurement timer is activated to start measuring the first duration t1, and when the first duration measurement timer is operating, the measurement of the first duration t1 is continued (steps # 51 to 53).

  Subsequently, in step # 54, it is determined whether or not the detected temperatures of all the hot water temperature sensors St, Sm, Sn, Sb are equal to or lower than the upper limit temperature of the set low temperature range. When the first duration t1 is reset to 0 and is not below, that is, when at least one detected temperature of the plurality of hot water temperature sensors St, Sm, Sn, Sb is higher than the upper limit temperature of the set low temperature range, The measurement of the first duration t1 by the first duration measurement timer is continued.

  Subsequently, a second duration measurement for measuring a second duration t2 in which a state in which at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb is lower than the lower limit temperature of the set high temperature range is continued. When the timer is not in operation, it is determined whether or not at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb is lower than the lower limit temperature of the set high temperature range. The measurement of the second duration t2 is started by operating the second duration measurement timer, and when the second duration measurement timer is operating, the measurement of the second duration t2 is continued (steps # 56 to 58). .

  Subsequently, in step # 59, it is determined whether or not the detected temperatures of all of the plurality of hot water temperature sensors St, Sm, Sn, Sb are equal to or higher than the lower limit temperature of the set high temperature range. When the second duration t2 is reset to 0 and it is not more than that, that is, when the detected temperature of the plurality of hot water temperature sensors St, Sm, Sn, Sb is lower than the lower limit temperature of the set high temperature range, The measurement of the second duration t2 by the second duration measurement timer is continued.

That is, when all the detected temperatures of the plurality of hot water temperature sensors St, Sm, Sn, and Sb are equal to or lower than the upper limit temperature of the set low temperature range, the water quality of the hot water in the hot water storage tank 2 can be improved by the heating operation of the hot water supply auxiliary heater 24. Since it can be heated to the heating reference temperature, the first duration t1 is reset to 0 when the detected temperatures of all of the hot and cold water temperature sensors St, Sm, Sn, and Sb are below the upper limit temperature of the set low temperature range.
When the detected temperatures of the plurality of hot water temperature sensors St, Sm, Sn, Sb are equal to or higher than the lower limit temperature of the set high temperature range, the entire hot water storage tank 2 is filled with hot water heated by the hot water storage heat exchanger 22. Since the hot water quality of the hot water storage tank 2 is in a good state, the detected temperature of all the hot water temperature sensors St, Sm, Sn, Sb is equal to or higher than the lower limit temperature of the set high temperature range. The second duration t2 is reset to zero.

[Third Embodiment]
Hereinafter, although 3rd Embodiment is described, this 3rd Embodiment demonstrates another embodiment of the process which discriminate | determines the necessity for a water quality improvement process, Comprising: The whole structure and water quality improvement of a cogeneration system Since the processing is the same as in the first embodiment, the illustration and description of the overall configuration of the cogeneration system and the description of the water quality improvement processing are omitted, and the processing for mainly determining whether or not the water quality improvement processing is necessary will be described. .

In the third embodiment, as in the first embodiment, the operation control unit 5 has a first duration time during which the temperature in the set low temperature range is not detected by the tank upper hot water temperature sensor St. When the water quality improvement processing timing that is equal to or longer than the first set allowable time is reached, the water quality improvement processing for suppressing the deterioration of the quality of the hot water in the hot water tank 2 is performed.
Similarly to the first embodiment, the operation control unit 5 is set to be predicted as the temperature of hot water when it is present in the hot water tank 2 after being heated by the hot water storage heat exchanger 22. The water quality improvement process is configured to be executed when the water quality improvement process timing at which the second duration time during which the temperature in the high temperature range is not detected by the tank bottom hot water temperature sensor Sb is equal to or longer than the second set allowable time is reached. In addition, the first duration time and the second duration time are reset to 0 with the execution of the water quality improvement process.

  And in this 3rd Embodiment, the said operation control part 5 makes the temperature in the said setting high temperature range by the said tank bottom part hot water temperature sensor Sb until the said 1st continuation time becomes more than the said 1st setting permissible time. When detected, the first duration time is reset to zero.

In other words, the operation control unit 5 starts measuring the first duration when the detected temperature of the tank upper hot water temperature sensor St becomes higher than the set low temperature range, and the detected temperature of the tank upper hot water temperature sensor St becomes the set low temperature. When the temperature falls within the range, or when the detected temperature of the bath bottom hot water temperature sensor Sb falls within the set high temperature range, the first duration is measured while the first duration is reset to 0. When the time is equal to or longer than the first set allowable time, the water quality improving process is executed.
Further, when the detected temperature of the bath bottom hot water temperature sensor Sb becomes lower than the set high temperature range, the operation control unit 5 starts measuring the second duration, and the detected temperature of the bath bottom hot water temperature sensor Sb is within the set high temperature range. When the temperature is reached, the second duration time is measured in a state where the second duration time is reset to 0. When the second duration time is equal to or longer than the second set allowable time, the water quality improvement process is executed.

FIG. 5 shows a flowchart of the duration measurement process for measuring the first duration and the second duration.
In this flowchart, if it is determined in step # 29 that the detected temperature Tb of the tank bottom temperature sensor Sb is equal to or higher than the lower limit temperature Rb of the set high temperature range, the first duration t1 is reset to 0 in step # 31. Except for the addition of processing, the flowchart is the same as the flowchart shown in FIG. 3 described in the first embodiment, and a description thereof will be omitted.

[Fourth Embodiment]
Hereinafter, although 4th Embodiment is described, this 4th Embodiment demonstrates another embodiment of the process which discriminate | determines the necessity for a water quality improvement process, Comprising: The whole structure of a cogeneration system is 1st. Since the water quality improvement process is the same as that of the second embodiment, the illustration and description of the entire configuration of the cogeneration system and the description of the water quality improvement process are omitted, and the water quality improvement process is mainly performed. Processing for determining whether processing is necessary will be described.

In the fourth embodiment, as in the second embodiment, the operation control unit 5 sets the temperature higher than the set low temperature range to at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb. When the water quality improvement processing timing at which the first continuation time for continuing the state detected by the water becomes equal to or longer than the first set allowable time is reached, the water quality improvement processing for suppressing the water quality deterioration of the hot water tank 2 is executed. It is configured.
Similarly to the second embodiment, the operation control unit 5 is set to be predicted as the temperature of the hot water when it is present in the hot water storage tank 2 after being heated by the hot water storage heat exchanger 22. Water quality improvement processing timing at which the second duration time during which the temperature detected by at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb is detected is higher than the second set allowable time. Then, it is configured to execute the water quality improvement process, and is configured to reset the first duration time and the second duration time to 0 with the execution of the water quality improvement process.

  And in this 4th Embodiment, the said operation control part 5 is the said hot water temperature sensor St, the temperature in the said setting high temperature range, until the said 1st continuation time becomes more than the said 1st setting permissible time. When detected by all of Sm, Sn, and Sb, the first duration time is reset to zero.

In other words, the operation control unit 5 starts measuring the first duration when at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb detects a temperature higher than the set low temperature range. The detected temperatures of all the hot water temperature sensors St, Sm, Sn, Sb are within the set low temperature range, or all the detected temperatures of the plurality of hot water temperature sensors St, Sm, Sn, Sb are the set high temperature range. The first duration time is measured in a state where the first duration time is reset to 0, and the water quality improvement process is executed when the first duration time exceeds the first set allowable time. ing.
Further, the operation control unit 5 starts measuring the second duration when at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb detects a temperature lower than the set high temperature range. When the detected temperatures of all the sensors St, Sm, Sn, and Sb are within the set high temperature range, the second duration is measured while the second duration is reset to 0, and the second duration is set to the second. It is configured to execute the water quality improvement process when the allowable time is exceeded.

FIG. 6 shows a flowchart of the duration measurement process for measuring the first duration and the second duration.
In this flow chart, if it is determined in step # 59 that the detected temperatures of all the hot water temperature sensors St, Sm, Sn, and Sb are equal to or higher than the lower limit temperature of the set high temperature range, the first duration time is determined in step # 61. Except for the addition of a process for resetting t1 to 0, the flowchart is the same as the flowchart shown in FIG. 4 described in the second embodiment, and a description thereof will be omitted.

[Fifth Embodiment]
Hereinafter, although 5th Embodiment is described, this 5th Embodiment demonstrates another embodiment of the process which discriminate | determines the necessity for a water quality improvement process, Comprising: The whole structure of a cogeneration system is 1st. Since it is the same as the embodiment and the water quality improvement process is the same as the first embodiment or the second embodiment, the illustration and description of the entire configuration of the cogeneration system and the description of the water quality improvement process are mainly omitted. The process for determining whether or not the water quality improvement process is necessary will be described.

In the fifth embodiment, as in the first embodiment, the operation control unit 5 continues the state where the temperature in the set low temperature range is not detected by the tank upper hot water temperature sensor St. Is configured to execute a water quality improvement process for suppressing a decrease in the quality of the hot water in the hot water tank 2 when the water quality improvement process timing reaches the first set allowable time L1.
Similarly to the first embodiment, the operation control unit 5 is set to a high temperature that is predicted as the temperature of hot water when it is present in the hot water storage tank 2 after being heated by the hot water storage heat exchanger 22. When the second continuation time t2 for continuing the state in which the temperature within the range is not detected by the tank bottom hot water temperature sensor Sb is the water quality improvement processing timing at which the second set allowable time L2 or more is reached, the water quality improvement processing is executed. It is configured.
And the operation control part 5 is comprised so that the said 1st continuation time t1 and the said 2nd continuation time t2 may be reset to 0 with execution of the said water quality improvement process.

  In the fifth embodiment, when the operation control unit 5 detects the temperature within the set low temperature range by the tank upper hot water temperature sensor St until the first duration t1 becomes equal to or longer than the first set allowable time L1, That is, when the detected temperature Tt of the tank upper water temperature sensor St is lower than the upper limit temperature Rt of the set low temperature range, the first duration t1 is configured to be reset to 0. When the tank bottom hot water temperature sensor Sb detects a temperature within the set high temperature range before the first duration t1 reaches the first set allowable time L1, that is, the detection temperature Tb of the tank bottom hot water temperature sensor Sb is set. When the temperature is higher than the lower limit temperature Rb of the high temperature range, the first duration t1 is reset to zero.

  Further, when the operation control unit 5 detects the temperature within the set high temperature range by the bath bottom hot water temperature sensor Sb before the second duration t2 becomes equal to or longer than the second set allowable time L2, the second duration time Although t2 is configured to be reset to 0, in addition, the temperature of the tank upper water temperature sensor St is within the set low temperature range until the second duration t2 becomes equal to or longer than the second set allowable time L2. Is detected, the second duration t2 is reset to zero.

Next, a duration measurement process for measuring the first duration t1 and the second duration t2 will be described based on the flowchart of FIG.
First, it is determined whether or not the first duration measurement timer is in operation (# 32). If it is determined that the first duration measurement timer is not in operation, the temperature in the set low temperature range is detected by the tank upper hot water temperature sensor St. It is determined whether the detected temperature Tt of the tank upper hot water temperature sensor St is higher than the upper limit temperature Rt of the set low temperature range (# 33). If it is determined that the temperature is higher, the first duration measurement is performed. The timer operation is started (# 34).
When it is determined that the operation is being performed in the determination of # 32 and when the process of starting the operation of the first duration measurement timer of # 34 is executed, the detection of the tank upper hot water temperature sensor St is performed next. It is determined whether the temperature Tt is lower than the upper limit temperature Rt of the set low temperature range (# 35). If it is determined that the temperature Tt is lower, the first duration t1 is reset to 0 (# 37). When it is determined that the temperature is high in # 35, it is next determined whether or not the detected temperature Tb of the bath bottom hot water temperature sensor Sb is higher than the lower limit temperature Rb of the set high temperature range (# 36). If it is determined that it is high, the first duration t1 is reset to 0 (# 37).

  If it is determined that it is not high in # 33, if it is determined that it is not high in # 36, and if the process of resetting the first duration t1 of # 37 to 0 is executed, then the second It is determined whether or not the duration measurement timer is operating (# 38). When it is determined that the temperature is not in operation, the temperature in the set high temperature range is not detected by the bath bottom hot water temperature sensor Sb, that is, the detected temperature Tb of the bath bottom hot water temperature sensor Sb is lower than the lower limit temperature Rb of the set high temperature range. Is determined to be lower (# 39), and if it is determined to be lower, the operation of the second duration measurement timer is started (# 40).

  When it is determined that the operation is being performed in the determination of # 38, and when the processing for starting the operation of the first duration measurement timer of # 40 is executed, the detection of the bath bottom hot water temperature sensor Sb is performed next. It is determined whether the temperature Tb is higher than the lower limit temperature Rb of the set high temperature range (# 41). If it is determined that the temperature Tb is higher, the second duration t1 is reset to 0 (# 43). When it is determined that the temperature is low in # 41, it is next determined whether or not the detected temperature Tt of the tank upper hot water temperature sensor St is lower than the upper limit temperature Rt of the set low temperature range (# 42). When it is determined that the time is low, the second duration t2 is reset to 0 (# 43).

[Sixth Embodiment]
Hereinafter, the sixth embodiment will be described. This sixth embodiment describes another embodiment of the process for determining whether or not the water quality improvement process is necessary, and the overall configuration of the cogeneration system is the first. Since it is the same as the embodiment and the water quality improvement process is the same as that of the first embodiment or the second embodiment, the illustration and description of the entire configuration of the cogeneration system and the description of the water quality improvement process are omitted. The process for determining whether or not the water quality improvement process is necessary will be mainly described.

In the sixth embodiment, similarly to the second embodiment, the operation control unit 5 sets the temperature higher than the set low temperature range to at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb. When the first continuation time t1 for continuing the state detected by the water reaches the water quality improvement processing timing at which the first set allowable time L1 or more is reached, the water quality improvement processing for suppressing the water quality deterioration of the hot water tank 2 is executed. It is configured as follows.
Similarly to the second embodiment, the operation control unit 5 is set to be predicted as the temperature of the hot water when it is present in the hot water storage tank 2 after being heated by the hot water storage heat exchanger 22. Water quality improvement in which the second continuation time t2 for continuing the state in which a temperature lower than the high temperature range is detected by at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb is equal to or longer than the second set allowable time L2. When the processing timing comes, the water quality improvement processing is executed.
And the operation control part 5 is comprised so that the said 1st continuation time t1 and the said 2nd continuation time t2 may be reset to 0 with execution of the said water quality improvement process.

  In the sixth embodiment, the operation control unit 5 determines that all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb are within the set low temperature range until the first duration t1 becomes equal to or longer than the first set allowable time L1. In other words, when all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb detect a temperature that is equal to or lower than the upper limit temperature Rt within the set low temperature range, the first duration t1 is set to 0. Although it is configured to reset, all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb are set to a high temperature by the time the first duration t1 becomes equal to or longer than the first set allowable time L1. When detecting a temperature within the range, that is, when all of the plurality of hot water temperature sensors St, Sm, Sn, Sb detect a temperature equal to or higher than the lower limit temperature Rb within the set high temperature range, the first duration t1 is set. To reset to zero It has been made.

  Further, the operation control unit 5 detects the temperature within the set high temperature range by all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb until the second duration t2 becomes equal to or longer than the second set allowable time L2. In this case, the second duration time t2 is configured to be reset to 0. In addition, a plurality of hot water temperature sensors are used until the second duration time t2 becomes equal to or longer than the second set allowable time L2. When all of St, Sm, Sn, and Sb detect temperatures within the set low temperature range, the second duration t2 is reset to zero.

Next, a duration measurement process for measuring the first duration t1 and the second duration t2 will be described based on the flowchart of FIG.
First, it is determined whether or not the first duration measurement timer is in operation (# 61). If it is determined that the first duration measurement timer is not in operation, all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb are detected. It is determined whether or not a temperature within the set low temperature range is not detected, that is, whether or not at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb is higher than the upper limit temperature Rt of the set low temperature range. (# 62) When it is determined that it is high, the operation of the first duration measurement timer is started (# 63).
When it is determined that the operation is being performed in the determination of # 61 and when the process of starting the operation of the first duration measurement timer of # 63 is executed, next, a plurality of hot water temperature sensors St, Sm , Sn, Sb are determined whether or not all the detected temperatures are lower than the upper limit temperature Rt of the set low temperature range (# 64). If it is determined that the detected temperatures are lower, the first duration t1 is reset to 0 ( # 66). If it is determined in # 64 that at least one of the hot water temperature sensors St, Sm, Sn, Sb is higher than the upper limit temperature Rt of the set low temperature range, When it is determined whether all the detected temperatures of the plurality of hot water temperature sensors St, Sm, Sn, Sb are higher than the lower limit temperature Rb of the set high temperature range (# 65), and when it is determined that all the detected temperatures are high Resets the first duration t1 to 0 (# 37).

  When it is determined at # 62 that all of the plurality of hot water temperature sensors St, Sm, Sn, Sb have detected temperatures within the set low temperature range, at # 65, the plurality of hot water temperature sensors St, Sm, Sn, When it is determined that all the detected temperatures of Sb are not higher than the lower limit temperature Rb of the set high temperature range, and when the process of resetting the first duration t1 of # 66 to 0 is executed, It is determined whether or not the 2 duration measuring timer is operating (# 67). When it is determined that it is not in operation, all of the plurality of hot water temperature sensors St, Sm, Sn, Sb do not detect the temperature within the set high temperature range, that is, the plurality of hot water temperature sensors St, Sm, Sn, It is determined whether or not at least one detected temperature of Sb is lower than the lower limit temperature Rb of the set high temperature range (# 68). If it is determined that at least one detected temperature is low, the second duration measurement is performed. The timer is started (# 69).

  When it is determined that the operation is being performed in the determination of # 67 and when the process of starting the operation of the first duration measurement timer of # 69 is executed, next, a plurality of hot water temperature sensors St, Sm , Sn, Sb all detect temperatures within the set high temperature range, that is, whether all detected temperatures of the plurality of hot water temperature sensors St, Sm, Sn, Sb are higher than the lower limit temperature Rb of the set high temperature range. (# 70), and if it is determined that all the detected temperatures are high, the second duration t1 is reset to 0 (# 72). If it is determined in # 70 that at least one detected temperature of the plurality of hot water temperature sensors St, Sm, Sn, Sb is lower than the lower limit temperature Rb of the set high temperature range, then the plurality of hot water temperatures It is determined whether or not all the detected temperatures of the sensors St, Sm, Sn, and Sb are lower than the upper limit temperature Rt of the set low temperature range (# 71), and when it is determined that all the detected temperatures are low, the second duration time t2 is reset to 0 (# 43).

[Seventh Embodiment]
Hereinafter, the seventh embodiment will be described. This seventh embodiment describes another embodiment of the process for determining whether or not the water quality improvement process is necessary, and the overall configuration of the cogeneration system is the first. Since it is the same as the embodiment and the water quality improvement process is the same as the first embodiment or the second embodiment, the illustration and description of the entire configuration of the cogeneration system and the description of the water quality improvement process are mainly omitted. The process for determining whether or not the water quality improvement process is necessary will be described.

  In the seventh embodiment, as in the first embodiment, the operation control unit 5 continues the state in which the temperature within the set low temperature range is not detected by the tank upper hot water temperature sensor St. Is configured to execute a water quality improvement process for suppressing a decrease in the quality of the hot water in the hot water tank 2 when the water quality improvement process timing reaches the first set allowable time L1.

And in this 7th Embodiment, unlike the said 1st Embodiment, the operation control part 5 is the hot water in the case where it exists in the said hot water storage tank 2 after heating with the said heat exchanger 22 for hot water storage. A second setting time t2 during which a state in which a temperature lower than the set high temperature range predicted as the temperature is detected by at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb is continued is a second setting allowance. The water quality improvement processing is configured to be executed when the water quality improvement processing timing reaches the time L2 or more.
And the operation control part 5 is comprised so that the said 1st continuation time t1 and the said 2nd continuation time t2 may be reset to 0 with execution of the said water quality improvement process.

  In the seventh embodiment, when the operation control unit 5 detects the temperature within the set low temperature range by the tank upper hot water temperature sensor St until the first duration t1 becomes equal to or longer than the first set allowable time L1, that is, When the detected temperature Tt of the tank upper hot water temperature sensor St is lower than the upper limit temperature Rt of the set low temperature range, it is configured to be reset to 0. In addition, the first duration t1 is the first duration t1. When all of the plurality of hot water temperature sensors St, Sm, Sn, Sb detect the temperature in the set low temperature range until the set allowable time L1 or more, or the plurality of hot water temperature sensors St, Sm, Sn, Sb Are all configured to reset the first duration t1 to 0 when a temperature in the set high temperature range is detected.

Further, the operation control unit 5 detects all the temperatures of the hot and cold water temperature sensors St, Sm, Sn, and Sb within the set high temperature range until the second duration t2 becomes equal to or longer than the second set allowable time L2. In this case, that is, when all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb detect a temperature that is equal to or higher than the lower limit temperature Rb within the set high temperature range, the second duration t2 is reset to zero. In addition, when the tank upper hot water temperature sensor St detects a temperature within the set low temperature range until the second duration t2 becomes equal to or longer than the second set allowable time L2, or a plurality of When all the hot water temperature sensors St, Sm, Sn, and Sb detect the temperature in the set low temperature range, the second duration t2 is reset to zero.
The duration measurement process for measuring the first duration t1 and the second duration t2 can be understood by referring to the flowcharts in the fifth embodiment and the sixth embodiment, and thus detailed description thereof is omitted. .

[Eighth Embodiment]
Hereinafter, the eighth embodiment will be described. The eighth embodiment describes another embodiment of the process for determining whether or not the water quality improvement process is necessary, and the overall configuration of the cogeneration system is the first. Since it is the same as the embodiment and the water quality improvement process is the same as the first embodiment or the second embodiment, the illustration and description of the entire configuration of the cogeneration system and the description of the water quality improvement process are mainly omitted. The process for determining whether or not the water quality improvement process is necessary will be described.

  In the eighth embodiment, similarly to the first embodiment described above, the operation control unit 5 continues the state where the temperature within the set low temperature range is not detected by the tank upper hot water temperature sensor St. Is configured to execute a water quality improvement process for suppressing a decrease in the quality of the hot water in the hot water tank 2 when the water quality improvement process timing reaches the first set allowable time L1.

In the eighth embodiment, unlike the first embodiment, the operation control unit 5 sets the temperature higher than the set low temperature range to at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb. When the second continuation time t2 for continuing the state detected by one becomes the water quality improvement processing timing at which the second set allowable time L2 or more is reached, the water quality improvement processing is executed.
And the operation control part 5 is comprised so that the said 1st continuation time t1 and the said 2nd continuation time t2 may be reset to 0 with execution of the said water quality improvement process.

  In the eighth embodiment, when the operation control unit 5 detects the temperature within the set low temperature range until the first set allowable time L1 or more, that is, the tank upper hot water temperature sensor. When the detected temperature Tt of St is lower than the upper limit temperature Rt of the set low temperature range, the first duration t1 is reset to 0. In addition, the first duration t1 is the first duration t1. When all of the plurality of hot water temperature sensors St, Sm, Sn, Sb detect the temperature in the set low temperature range until the set allowable time L1 or more, or the plurality of hot water temperature sensors St, Sm, Sn, Sb Are all configured to reset the first duration t1 to 0 when a temperature in the set high temperature range is detected.

Further, the operation control unit 5 detects the temperature within the set low temperature range by all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb until the second duration t2 becomes equal to or longer than the second set allowable time L2. In this case, that is, when all the detected temperatures of the plurality of hot water temperature sensors St, Sm, Sn, Sb are equal to or lower than the upper limit temperature Rt within the set low temperature range, the second duration t2 is reset to zero. In addition, when the tank upper hot water temperature sensor St detects the temperature within the set low temperature range until the second duration t2 becomes equal to or longer than the second set allowable time L2, or a plurality of hot water When all of the temperature sensors St, Sm, Sn, and Sb detect the temperature in the set high temperature range, the second duration t2 is reset to zero.
The duration measurement process for measuring the first duration t1 and the second duration t2 can be understood by referring to the flowcharts in the fifth embodiment and the sixth embodiment, and thus detailed description thereof is omitted. .

[Ninth Embodiment]
Hereinafter, the ninth embodiment will be described. The ninth embodiment describes another embodiment of the process for determining whether or not the water quality improvement process is necessary, and the overall configuration of the cogeneration system is the first. Since it is the same as the embodiment and the water quality improvement process is the same as the first embodiment or the second embodiment, the illustration and description of the entire configuration of the cogeneration system and the description of the water quality improvement process are mainly omitted. The process for determining whether or not the water quality improvement process is necessary will be described.

  In the ninth embodiment, as in the first embodiment, the operation control unit 5 continues the state where the temperature in the set low temperature range is not detected by the tank upper hot water temperature sensor St. Is configured to execute a water quality improvement process for suppressing a decrease in the quality of the hot water in the hot water tank 2 when the water quality improvement process timing reaches the first set allowable time L1.

And in this 9th Embodiment, like the said 7th Embodiment, the operation control part 5 is the hot water in the case where it exists in the said hot water storage tank 2 after heating with the said hot water storage heat exchanger 22 A second duration t2 for continuing the state in which a temperature lower than the set high temperature range predicted as the temperature is detected by at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb is a second setting. The water quality improving process is executed when the water quality improving process timing reaches the allowable time L2 or more.
And the operation control part 5 is comprised so that the said 1st continuation time t1 and the said 2nd continuation time t2 may be reset to 0 with execution of the said water quality improvement process.

  In the ninth embodiment, when the operation control unit 5 detects the temperature within the set low temperature range by the tank upper hot water temperature sensor St until the first duration t1 becomes equal to or longer than the first set allowable time L1, that is, In addition, when the detected temperature Tt of the tank upper hot water temperature sensor St is lower than the upper limit temperature Rt of the set low temperature range, the first duration t1 is reset to 0. When all of the plurality of hot water temperature sensors St, Sm, Sn, Sb detect the temperature in the set low temperature range before the one duration t1 becomes equal to or longer than the first set allowable time L1, the plurality of hot water temperature sensors St, Sm , Sn, Sb when the temperature in the set high temperature range is detected, or when the tank bottom hot water temperature sensor Sb detects the temperature in the set high temperature range, the first duration t1 is reset to zero. Ni It is.

Further, the operation control unit 5 detects all the temperatures of the hot and cold water temperature sensors St, Sm, Sn, and Sb within the set high temperature range until the second duration t2 becomes equal to or longer than the second set allowable time L2. In this case, that is, when all of the detected temperatures of the plurality of hot water temperature sensors St, Sm, Sn, and Sb are equal to or higher than the lower limit temperature Rb within the set high temperature range, the first duration t1 is reset to zero. In addition, when the tank upper hot water temperature sensor St detects a temperature within the set low temperature range before the second duration t2 becomes equal to or longer than the second set allowable time L2, a plurality of hot water temperature sensors are detected. When all of St, Sm, Sn, and Sb detect the temperature in the set low temperature range, or when the bath bottom hot water temperature sensor Sb detects the temperature in the set high temperature range, the second duration t2 is reset to 0. Configured to To have.
The duration measurement process for measuring the first duration t1 and the second duration t2 can be understood by referring to the flowcharts in the fifth embodiment and the sixth embodiment, and thus detailed description thereof is omitted. .

[Tenth embodiment]
Hereinafter, although 10th Embodiment is described, this 10th Embodiment demonstrates another embodiment of the process which discriminate | determines the necessity for a water quality improvement process, Comprising: The whole structure of a cogeneration system is 1st. Since it is the same as the embodiment and the water quality improvement process is the same as the first embodiment or the second embodiment, the illustration and description of the entire configuration of the cogeneration system and the description of the water quality improvement process are mainly omitted. The process for determining whether or not the water quality improvement process is necessary will be described.

  In the tenth embodiment, as in the first embodiment, the operation control unit 5 continues the state in which the temperature in the set low temperature range is not detected by the tank upper hot water temperature sensor St. Is configured to execute a water quality improvement process for suppressing a decrease in the quality of the hot water in the hot water tank 2 when the water quality improvement process timing becomes equal to or longer than the first set allowable time L1.

In the ninth embodiment, as in the eighth embodiment, the operation control unit 5 sets a temperature higher than the set low temperature range among the hot water temperature sensors St, Sm, Sn, Sb. When the second continuation time t2 for continuing the state detected by at least one becomes the water quality improvement processing timing at which the second set allowable time L2 or more is reached, the water quality improvement processing is executed.
And the operation control part 5 is comprised so that the said 1st continuation time t1 and the said 2nd continuation time t2 may be reset to 0 with execution of the said water quality improvement process.

  In the tenth embodiment, when the operation control unit 5 detects the temperature within the set low temperature range by the tank upper hot water temperature sensor St until the first duration t1 becomes equal to or longer than the first set allowable time L1, that is, When the detected temperature Tt of the tank upper hot water temperature sensor St is equal to or lower than the upper limit temperature Rt of the set low temperature range, the first duration t1 and the second duration t2 are reset to zero. However, when all of the plurality of hot water temperature sensors St, Sm, Sn, Sb detect the temperature in the set low temperature range until the first duration t1 becomes equal to or longer than the first set allowable time L1, When all of the hot water temperature sensors St, Sm, Sn, and Sb detect the temperature in the set high temperature range, or when the tank bottom hot water temperature sensor Sb detects the temperature in the set high temperature range, the first duration t1 0 It is configured to reset.

Further, the operation control unit 5 detects the temperature within the set low temperature range by all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb until the second duration t2 becomes equal to or longer than the second set allowable time L2. In other words, if all the detected temperatures of the plurality of hot water temperature sensors St, Sm, Sn, Sb detect a temperature not more than the upper limit temperature Rt within the set low temperature range, the first duration t1 is reset to 0. In addition, when the tank upper hot water temperature sensor St detects the temperature within the set low temperature range until the second duration t2 becomes equal to or longer than the second set allowable time L2, When all of the plurality of hot water temperature sensors St, Sm, Sn, Sb detect the temperature in the set high temperature range, or when the bath bottom hot water temperature sensor Sb detects the temperature in the set high temperature range, the second duration time Reset t2 to 0 It is configured to.
The duration measurement process for measuring the first duration t1 and the second duration t2 can be understood by referring to the flowcharts in the fifth embodiment and the sixth embodiment, and thus detailed description thereof is omitted. .

[Eleventh embodiment]
The eleventh embodiment will be described below. The eleventh embodiment describes another embodiment of a process for determining whether or not a water quality improvement process is necessary, and the overall configuration of the cogeneration system is the first. Since it is the same as the embodiment and the water quality improvement process is the same as the first embodiment or the second embodiment, the illustration and description of the entire configuration of the cogeneration system and the description of the water quality improvement process are mainly omitted. The process for determining whether or not the water quality improvement process is necessary will be described.

  In the eleventh embodiment, similarly to the first embodiment, the operation control unit 5 continues the state where the temperature in the set low temperature range is not detected by the tank upper hot water temperature sensor St. Is configured to execute a water quality improvement process for suppressing a decrease in the quality of the hot water in the hot water tank 2 when the water quality improvement process timing becomes equal to or longer than the first set allowable time L1.

In the eleventh embodiment, similarly to the fifth embodiment, the operation control unit 5 is heated in the hot water storage tank 2 after being heated in the hot water storage heat exchanger 22, and the hot water in this case. When the second duration t2 for continuing the state in which the temperature within the set high temperature range predicted as the temperature of the tank is not detected by the tank bottom hot water temperature sensor Sb is the water quality improvement processing timing at which the second set allowable time L2 or more is reached, It is comprised so that a water quality improvement process may be performed.
And the operation control part 5 is comprised so that the said 1st continuation time t1 and the said 2nd continuation time t2 may be reset to 0 with execution of the said water quality improvement process.

  In the eleventh embodiment, when the operation control unit 5 detects the temperature within the set low temperature range by the tank upper hot water temperature sensor St until the first duration t1 becomes equal to or longer than the first set allowable time L1, that is, When the detected temperature Tt of the tank upper hot water temperature sensor St is equal to or lower than the upper limit temperature Rt of the set low temperature range, the first duration time t1 is reset to 0. If all of the plurality of hot water temperature sensors St, Sm, Sn, Sb detect the temperature in the set low temperature range before the duration time t1 becomes equal to or longer than the first set allowable time L1, the plurality of hot water temperature sensors St, Sm, When all of Sn and Sb detect the temperature in the set high temperature range, or when the tank bottom hot water temperature sensor Sb detects the temperature in the set high temperature range, the first duration t1 and the second duration t2 are set. Reset to 0 It is configured to Tsu door.

Further, when the operation control unit 5 detects the temperature within the set high temperature range until the second duration t2 becomes equal to or longer than the second set allowable time L2, the tank bottom hot water temperature sensor Sb detects the set high temperature range. When the tank bottom hot water temperature sensor Sb detects a temperature equal to or higher than the lower limit temperature Rb, the second duration t2 is reset to 0. In addition, the second duration t2 When the tank upper hot water temperature sensor St detects a temperature within the set low temperature range before the second set allowable time L2 is reached, all of the plurality of hot water temperature sensors St, Sm, Sn, Sb are within the set low temperature range. When the temperature is detected, or when all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb detect the temperature in the set high temperature range, the second duration t2 is configured to be reset to zero. Yes.
The duration measurement process for measuring the first duration t1 and the second duration t2 can be understood by referring to the flowcharts in the fifth embodiment and the sixth embodiment, and thus detailed description thereof is omitted. .

[Twelfth embodiment]
Hereinafter, the twelfth embodiment will be described. The twelfth embodiment describes another embodiment of the process for determining whether or not the water quality improvement process is necessary, and the overall configuration of the cogeneration system is the first. Since it is the same as the embodiment and the water quality improvement process is the same as the first embodiment or the second embodiment, the illustration and description of the entire configuration of the cogeneration system and the description of the water quality improvement process are mainly omitted. The process for determining whether or not the water quality improvement process is necessary will be described.

  In the twelfth embodiment, as in the second embodiment, the operation control unit 5 sets the temperature higher than the set low temperature range to at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb. When the first continuation time t1 for continuing the state detected by the water reaches the water quality improvement processing timing at which the first set allowable time L1 or more is reached, the water quality improvement processing for suppressing the water quality deterioration of the hot water tank 2 is executed. It is configured as follows.

Similarly to the second embodiment, the operation control unit 5 is set to be predicted as the temperature of the hot water when it is present in the hot water storage tank 2 after being heated by the hot water storage heat exchanger 22. Water quality improvement in which the second continuation time t2 for continuing the state in which a temperature lower than the high temperature range is detected by at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb is equal to or longer than the second set allowable time L2. When the processing timing comes, the water quality improvement processing is executed.
And the operation control part 5 is comprised so that the said 1st continuation time t1 and the said 2nd continuation time t2 may be reset to 0 with execution of the said water quality improvement process.

  In the twelfth embodiment, the operation control unit 5 determines that all of the plurality of hot water temperature sensors St, Sm, Sn, Sb are within the set low temperature range until the first duration t1 becomes equal to or longer than the first set allowable time L1. In other words, when all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb detect a temperature that is equal to or lower than the upper limit temperature Rt within the set low temperature range, the first duration t1 is set to 0. Although it is configured to reset, all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb are set to a high temperature by the time the first duration t1 becomes equal to or longer than the first set allowable time L1. When detecting a temperature within the range, that is, when all of the plurality of hot water temperature sensors St, Sm, Sn, Sb detect a temperature equal to or higher than the lower limit temperature Rb within the set high temperature range, or the tank upper hot water temperature sensor St is set low When detecting the temperature within the range, that is, when the tank upper hot water temperature sensor St detects a temperature equal to or lower than the upper limit temperature Rt within the set low temperature range, the first duration time t1 is reset to zero. ing.

Further, the operation control unit 5 detects the temperature within the set high temperature range by all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb until the second duration t2 becomes equal to or longer than the second set allowable time L2. In this case, the second duration time t2 is configured to be reset to 0. In addition, a plurality of hot water temperature sensors are used until the second duration time t2 becomes equal to or longer than the second set allowable time L2. When all of St, Sm, Sn, and Sb detect the temperature within the set low temperature range, or when the tank upper hot water temperature sensor St detects the temperature within the set low temperature range, the second duration t2 is set to 0. Is configured to reset.
The duration measurement process for measuring the first duration t1 and the second duration t2 can be understood by referring to the flowcharts in the fifth embodiment and the sixth embodiment, and thus detailed description thereof is omitted. .

[Thirteenth embodiment]
Hereinafter, the thirteenth embodiment will be described. The thirteenth embodiment describes another embodiment of a process for determining whether or not a water quality improvement process is necessary, and the overall configuration of the cogeneration system is the first. Since it is the same as the embodiment and the water quality improvement process is the same as the first embodiment or the second embodiment, the illustration and description of the entire configuration of the cogeneration system and the description of the water quality improvement process are mainly omitted. The process for determining whether or not the water quality improvement process is necessary will be described.

  In the thirteenth embodiment, as in the second embodiment, the operation control unit 5 sets the temperature higher than the set low temperature range to at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb. When the first continuation time t1 for continuing the state detected by the water reaches the water quality improvement processing timing at which the first set allowable time L1 or more is reached, the water quality improvement processing for suppressing the water quality deterioration of the hot water tank 2 is executed. It is configured as follows.

Similarly to the second embodiment, the operation control unit 5 is set to be predicted as the temperature of the hot water when it is present in the hot water storage tank 2 after being heated by the hot water storage heat exchanger 22. Water quality improvement in which the second continuation time t2 for continuing the state in which a temperature lower than the high temperature range is detected by at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb is equal to or longer than the second set allowable time L2. When the processing timing comes, the water quality improvement processing is executed.
And the operation control part 5 is comprised so that the said 1st continuation time t1 and the said 2nd continuation time t2 may be reset to 0 with execution of the said water quality improvement process.

  In the thirteenth embodiment, the operation control unit 5 determines that all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb are within the set low temperature range until the first duration t1 becomes equal to or longer than the first set allowable time L1. In other words, when all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb detect a temperature that is equal to or lower than the upper limit temperature Rt within the set low temperature range, the first duration t1 is set to 0. Although it is configured to reset, all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb are set to a high temperature by the time the first duration t1 becomes equal to or longer than the first set allowable time L1. When detecting a temperature within the range, that is, when all of the plurality of hot water temperature sensors St, Sm, Sn, Sb detect a temperature equal to or higher than the lower limit temperature Rb within the set high temperature range, or the bath bottom hot water temperature sensor Sb is set high When detecting a temperature within the range, that is, when the tank bottom hot water temperature sensor Sb detects a temperature equal to or higher than the lower limit temperature Rb within the set high temperature range, the first duration t1 is reset to zero. ing.

Further, the operation control unit 5 detects the temperature within the set high temperature range by all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb until the second duration t2 becomes equal to or longer than the second set allowable time L2. In this case, the second duration time t2 is configured to be reset to 0. In addition, a plurality of hot water temperature sensors are used until the second duration time t2 becomes equal to or longer than the second set allowable time L2. When all of St, Sm, Sn, and Sb detect the temperature within the set low temperature range, or when the tank bottom hot water temperature sensor Sb detects the temperature within the set high temperature range, the second duration t2 is set. It is configured to reset to zero.
The duration measurement process for measuring the first duration t1 and the second duration t2 can be understood by referring to the flowcharts in the fifth embodiment and the sixth embodiment, and thus detailed description thereof is omitted. .

[Fourteenth embodiment]
Hereinafter, the fourteenth embodiment will be described. The fourteenth embodiment describes another embodiment of a process for determining whether or not a water quality improvement process is necessary, and the overall configuration of the cogeneration system is the first. Since it is the same as the embodiment and the water quality improvement process is the same as the first embodiment or the second embodiment, the illustration and description of the entire configuration of the cogeneration system and the description of the water quality improvement process are mainly omitted. The process for determining whether or not the water quality improvement process is necessary will be described.

  In the fourteenth embodiment, as in the second embodiment, the operation control unit 5 sets the temperature higher than the set low temperature range to at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb. When the first continuation time t1 for continuing the state detected by the water reaches the water quality improvement processing timing at which the first set allowable time L1 or more is reached, the water quality improvement processing for suppressing the water quality deterioration of the hot water tank 2 is executed. It is configured as follows.

Similarly to the second embodiment, the operation control unit 5 is set to be predicted as the temperature of the hot water when it is present in the hot water storage tank 2 after being heated by the hot water storage heat exchanger 22. Water quality improvement in which the second continuation time t2 for continuing the state in which a temperature lower than the high temperature range is detected by at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb is equal to or longer than the second set allowable time L2. When the processing timing comes, the water quality improvement processing is executed.
And the operation control part 5 is comprised so that the said 1st continuation time t1 and the said 2nd continuation time t2 may be reset to 0 with execution of the said water quality improvement process.

  In the fourteenth embodiment, the operation control unit 5 determines that all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb are within the set low temperature range until the first duration t1 becomes equal to or longer than the first set allowable time L1. In other words, when all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb detect a temperature that is equal to or lower than the upper limit temperature Rt within the set low temperature range, the first duration t1 is set to 0. Although it is configured to reset, all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb are set to a high temperature by the time the first duration t1 becomes equal to or longer than the first set allowable time L1. When detecting a temperature within the range, that is, when all of the plurality of hot water temperature sensors St, Sm, Sn, Sb detect a temperature equal to or higher than the lower limit temperature Rb within the set high temperature range, the tank upper hot water temperature sensor St is Set low temperature range Is detected, that is, when the tank upper hot water temperature sensor St detects a temperature below the upper limit temperature Rt within the set low temperature range, or the tank bottom hot water temperature sensor Sb detects a temperature within the set high temperature range. In other words, when the tank bottom hot water temperature sensor Sb detects a temperature equal to or higher than the lower limit temperature Rb within the set high temperature range, the first duration t1 is reset to zero.

Further, the operation control unit 5 detects the temperature within the set high temperature range by all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb until the second duration t2 becomes equal to or longer than the second set allowable time L2. In this case, the second duration time t2 is configured to be reset to 0. In addition, a plurality of hot water temperature sensors are used until the second duration time t2 becomes equal to or longer than the second set allowable time L2. When all of St, Sm, Sn, Sb detect the temperature within the set low temperature range, when the tank upper hot water temperature sensor St detects the temperature within the set low temperature range, or when the tank bottom hot water temperature sensor Sb sets When detecting a temperature within the high temperature range, the second duration t2 is reset to zero.
The duration measurement process for measuring the first duration t1 and the second duration t2 can be understood by referring to the flowcharts in the fifth embodiment and the sixth embodiment, and thus detailed description thereof is omitted. .

[Fifteenth embodiment]
The fifteenth embodiment will be described below. The fifteenth embodiment describes another embodiment of a process for determining whether or not a water quality improvement process is necessary, and the overall configuration of the cogeneration system is the first. Since it is the same as the embodiment and the water quality improvement process is the same as the first embodiment or the second embodiment, the illustration and description of the entire configuration of the cogeneration system and the description of the water quality improvement process are mainly omitted. The process for determining whether or not the water quality improvement process is necessary will be described.

  In the fifteenth embodiment, similarly to the second embodiment, the operation control unit 5 sets the temperature higher than the set low temperature range to at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb. When the first continuation time t1 for continuing the state detected by the water reaches the water quality improvement processing timing at which the first set allowable time L1 or more is reached, the water quality improvement processing for suppressing the water quality deterioration of the hot water tank 2 is executed. It is configured as follows.

The operation control unit 5 is different from the second embodiment described above, and the operation control unit 5 is heated in the hot water storage heat exchanger 22 and then exists in the hot water storage tank 2. When the second continuation time t2 for continuing the state in which the tank bottom hot water temperature sensor Sb detects a temperature lower than the set high temperature range predicted as the temperature is the water quality improvement processing timing at which the second set allowable time L2 is reached, It is comprised so that the said water quality improvement process may be performed.
And the operation control part 5 is comprised so that the said 1st continuation time t1 and the said 2nd continuation time t2 may be reset to 0 with execution of the said water quality improvement process.

  In the fifteenth embodiment, the operation control unit 5 determines that all of the plurality of hot water temperature sensors St, Sm, Sn, Sb are within the set low temperature range before the first duration t1 becomes equal to or longer than the first set allowable time L1. In other words, when all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb detect a temperature that is equal to or lower than the upper limit temperature Rt within the set low temperature range, the first duration t1 is set to 0. Although it is configured to reset, all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb are set to a high temperature by the time the first duration t1 becomes equal to or longer than the first set allowable time L1. When detecting a temperature within the range, that is, when all of the plurality of hot water temperature sensors St, Sm, Sn, Sb detect a temperature equal to or higher than the lower limit temperature Rb within the set high temperature range, or the bath bottom hot water temperature sensor Sb is set high When detecting a temperature within the range, that is, when the tank bottom hot water temperature sensor Sb detects a temperature equal to or higher than the lower limit temperature Rb within the set high temperature range, the first duration t1 is reset to zero. ing.

Further, when the tank bottom hot water temperature sensor Sb detects the temperature within the set high temperature range before the second continuation time t2 becomes equal to or longer than the second set allowable time L2, the operation control unit 5 performs the second continuation. The time t2 is configured to be reset to 0. In addition, a plurality of hot water temperature sensors St, Sm, Sn, Sb are required until the second duration t2 becomes equal to or longer than the second set allowable time L2. Is detected within the set high temperature range, or when all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb detect temperatures within the set low temperature range, the second duration t2 is set to 0. Configured to reset.
The duration measurement process for measuring the first duration t1 and the second duration t2 can be understood by referring to the flowcharts in the fifth embodiment and the sixth embodiment, and thus detailed description thereof is omitted. .

[Sixteenth Embodiment]
Hereinafter, the sixteenth embodiment will be described. The sixteenth embodiment describes another embodiment of a process for determining whether or not a water quality improvement process is necessary, and the overall configuration of the cogeneration system is the first. Since it is the same as the embodiment and the water quality improvement process is the same as the first embodiment or the second embodiment, the illustration and description of the entire configuration of the cogeneration system and the description of the water quality improvement process are mainly omitted. The process for determining whether or not the water quality improvement process is necessary will be described.

  In the sixteenth embodiment, similarly to the second embodiment, the operation control unit 5 sets the temperature higher than the set low temperature range to at least one of the plurality of hot water temperature sensors St, Sm, Sn, Sb. When the first continuation time t1 for continuing the state detected by the water reaches the water quality improvement processing timing at which the first set allowable time L1 or more is reached, the water quality improvement processing for suppressing the water quality deterioration of the hot water tank 2 is executed. It is configured as follows.

The operation control unit 5 is different from the second embodiment described above, and the operation control unit 5 is heated in the hot water storage heat exchanger 22 and then exists in the hot water storage tank 2. When the second continuation time t2 for continuing the state in which the tank bottom hot water temperature sensor Sb detects a temperature lower than the set high temperature range predicted as the temperature is the water quality improvement processing timing at which the second set allowable time L2 is reached, It is comprised so that the said water quality improvement process may be performed.
And the operation control part 5 is comprised so that the said 1st continuation time t1 and the said 2nd continuation time t2 may be reset to 0 with execution of the said water quality improvement process.

  In the sixteenth embodiment, the operation control unit 5 determines that all of the plurality of hot water temperature sensors St, Sm, Sn, Sb are within the set low temperature range until the first duration t1 becomes equal to or longer than the first set allowable time L1. In other words, when all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb detect a temperature that is equal to or lower than the upper limit temperature Rt within the set low temperature range, the first duration t1 is set to 0. Although it is configured to reset, all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb are set to a high temperature by the time the first duration t1 becomes equal to or longer than the first set allowable time L1. When detecting a temperature within the range, that is, when all of the plurality of hot water temperature sensors St, Sm, Sn, Sb detect a temperature equal to or higher than the lower limit temperature Rb within the set high temperature range, the bath bottom hot water temperature sensor Sb is Set high temperature range In other words, when the tank bottom hot water temperature sensor Sb detects a temperature equal to or higher than the lower limit temperature Rb within the set high temperature range, or the tank upper hot water temperature sensor St detects a temperature within the set low temperature range. In other words, when the tank upper hot water temperature sensor St detects a temperature equal to or lower than the upper limit temperature Rt within the set low temperature range, the first duration t1 is reset to zero.

Further, when the tank bottom hot water temperature sensor Sb detects the temperature within the set high temperature range before the second continuation time t2 becomes equal to or longer than the second set allowable time L2, the operation control unit 5 performs the second continuation. The time t2 is configured to be reset to 0. In addition, a plurality of hot water temperature sensors St, Sm, Sn, Sb are required until the second duration t2 becomes equal to or longer than the second set allowable time L2. When all of the temperature of the plurality of hot water temperature sensors St, Sm, Sn, Sb detect the temperature within the set low temperature range, or when the tank upper hot water temperature sensor St is set low temperature When detecting the temperature within the range, the second duration t2 is reset to zero.
The duration measurement process for measuring the first duration t1 and the second duration t2 can be understood by referring to the flowcharts in the fifth embodiment and the sixth embodiment, and thus detailed description thereof is omitted. .

[Seventeenth embodiment]
Hereinafter, the seventeenth embodiment will be described. However, the seventeenth embodiment describes another embodiment of the water quality improvement process, and the overall configuration of the cogeneration system is the same as that of the first embodiment. The duration measurement process in the process for determining whether or not the water quality improvement process is necessary can be applied to those described in the first to sixteenth embodiments, and the illustration and explanation of the entire configuration of the cogeneration system are shown. In addition, the description of the duration measurement process will be omitted, and the water quality improvement process will be mainly described, and if necessary, the entire configuration of the cogeneration system will be additionally described.

In the seventeenth embodiment, when the operation control unit 5 reaches the water quality improvement processing timing as the water quality improvement processing, the operation of the heating unit H, that is, the operation of the fuel cell 1 and the hot water is performed. When the circulation pump 19 is in operation, it waits until the operation stop condition for stopping the operation of the fuel cell 1 is satisfied (that is, the operation of the fuel cell 1 and the operation of the hot water circulation pump 19 are continued), When the operation stop condition is satisfied and the operation of the fuel cell 1 and the operation of the hot water circulation pump 19 are stopped, the fuel cell 1 is determined until it is determined that the total amount of hot water in the hot water tank 2 is within the set low temperature range. And a standby hot water replacement process for stopping the operation of the hot water circulation pump 19 is performed.
It should be noted that, when the water quality improvement processing timing is reached, when the operation of the heating unit H is stopped, that is, when the operation of the fuel cell 1 is stopped and the operation of the hot water circulation pump 19 is stopped, Until it is determined that the total amount of hot water is within the set low temperature range, the operation of the fuel cell 1 is stopped and the operation of the hot water circulation pump 19 is stopped.

  When the operation stop condition is described, the operation control unit 5 sets the automatic operation mode and the manual operation mode in the remote control operation unit (not shown) of the cogeneration system described above, and the manual operation mode. In this case, when an activation command is commanded by the remote control operation unit, a fuel cell operation process for operating devices necessary for the operation, such as the operation of the fuel cell 1 and the operation of the hot water circulation pump 19, is performed. Further, when a stop command is instructed by the remote control operation unit, a fuel cell stop process for stopping the operation of the operated devices, such as the operation of the fuel cell 1 and the operation of the hot water circulation pump 19, is performed. It will be.

  In the automatic operation mode, the operation control unit 5 executes the operation mode setting process at the start of the operation cycle as described above. Then, when setting to continuously operate the fuel cell 1 from the operation mode setting process, that is, when setting all the time zones as the operation time zones, and some time zones by the intermittent operation. In any case, the fuel cell operation processing is executed in the operation time zone, that is, in the operation timing, and in other times than the set operation time zone, that is, when it is not the operation timing. The fuel cell stop process is executed.

When the hot water stored in the hot water tank 2 is not full, that is, the operation control unit 5 means that at least one of the hot water temperature sensors St, Sm, Sn, Sb is a lower limit within a set high temperature range. When a temperature lower than the temperature Rb is detected, or when the tank bottom hot water temperature sensor Sb detects a temperature lower than the lower limit temperature Rb within the set high temperature range, it is determined that the operation is possible. When it is determined that the vehicle can be operated, in the manual operation mode, when the start command is instructed by the remote control operation unit, and in the automatic operation mode, when the operation timing is the operation time zone. Then, the operation process of the fuel cell is executed.
Further, when the hot water stored in the hot water tank 2 is full, that is, the operation control unit 5 means that all of the plurality of hot water temperature sensors St, Sm, Sn, Sb are within the set high temperature range. When a temperature higher than Rb is detected, or when the bath bottom hot water temperature sensor Sb detects a temperature higher than the lower limit temperature Rb within the set high temperature range, it is determined that the operation is impossible. In the manual operation mode, the fuel cell stop process is executed even when a start command is issued by the remote control operation unit, and in the automatic operation mode, even when the operation timing is the operation time zone. become.
In the seventeenth embodiment, since the operation of the fuel cell 1 is stopped when the hot water stored in the hot water tank 2 is full, the radiator 33 described in the first embodiment. Is not necessary, and the radiator 33 can be omitted.

Further, when the operation control unit 5 continues the fuel cell operation process for a set time (for example, when it continues for 648 hours, which corresponds to 27 days), the operation control unit 5 uses the fuel to temporarily stop the fuel cell 1. Execute battery stop processing.
Incidentally, if the operation time continues for the set time in this way, the fuel cell stop process is performed in the home where the cogeneration system is installed, for example, the amount of fuel gas supplied to the home where the fuel cell 1 is installed. A microcomputer meter to be monitored will be equipped, and the microcomputer meter will exceed the set monitoring time (for example, 720 hours, which corresponds to 30 days) for which the fuel gas supply continues. In order to prevent the microcomputer meter from operating the emergency stop function unnecessarily, the emergency stop function for stopping the gas supply is provided.

  Therefore, when the operation stop condition for stopping the operation of the fuel cell 1 is satisfied, when a stop command is commanded in the manual operation mode, or when a time zone other than the operation time zone is entered in the automatic operation mode, This corresponds to a case where the hot water stored in the hot water storage tank 2 is full and cannot be operated or when the fuel cell operation process is continued for a set time.

In addition, the operation control unit 5 detects that the temperature of the bath upper hot water temperature sensor St is equal to or lower than the upper limit temperature Rt within the set low temperature range, so that the total amount of hot water in the hot water storage tank 2 is within the set low temperature range. Is configured to determine.
By the way, in order to determine that the total amount of hot water in the hot water tank 2 is within the set temperature range, the hot water temperature in the hot water tank 2 is detected when the tank upper hot water temperature sensor St detects the temperature within the set low temperature range. When the plurality of hot water temperature sensors St to Sb detect temperatures within the set low temperature range instead of the configuration for determining that the total amount is within the set temperature range, the total amount of hot water in the hot water tank 2 is within the set temperature range. It is good also as a structure which discriminate | determines that it is this temperature. Further, when the accumulated amount of hot water discharged from the hot water tank 2 is equal to or greater than the capacity of the hot water tank 2, the total amount of hot water in the hot water tank 2 may be determined to be within the set temperature range.

  In the seventeenth embodiment, when the operation control unit 5 comes to the water quality improvement processing timing, the operation stop condition is established because the fuel cell 1 is in operation and the hot water circulation pump 19 is in operation. When the standby time is longer than the allowable standby time (for example, 24 hours), the operation of the fuel cell 1 and the operation of the hot water circulation pump 19 are forcibly stopped and the hot water tank 2 is Until the total amount of hot water is determined to be within the set low temperature range, the forced stop hot water replacement process for stopping the operation of the heating means and the operation of the hot water circulation means is executed. Yes.

  Further, in the seventeenth embodiment, when the operation control unit 5 comes to the water quality improvement processing timing, the operation stop condition is established because the fuel cell 1 is operating and the hot water circulation pump 19 is operating. In the case where it is determined that the total amount of hot water in the hot water tank 2 is a temperature within the set low temperature range, and the total amount of hot water in the hot water tank is When it is determined that the temperature is within the set high temperature range, the standby type hot / cold water replacement process is stopped, assuming that the end condition is satisfied.

  That is, the operation control unit 5 is configured such that when all of the plurality of hot water temperature sensors St, Sm, Sn, and Sb detect temperatures within the set low temperature range, or the tank upper hot water temperature sensor St sets the temperature within the set low temperature range. In the case of detection, it is configured to discriminate that the total amount of hot water in the hot water storage tank 2 is within the set low temperature range, and all of the plurality of hot water temperature sensors St, Sm, Sn, Sb are set. When detecting the temperature within the high temperature range, or when the tank bottom hot water temperature sensor Sb detects the temperature within the set high temperature range, the total amount of hot water in the hot water storage tank is the temperature within the set high temperature range. It is configured to determine that there is.

Next, the control operation of the operation control unit 5 in the seventeenth embodiment will be described based on the flowchart of FIG.
First, it is determined whether or not the fuel cell operation process is continued for a set time, that is, whether or not the fuel cell 1 is continuously operated for a set time (# 81). In order to stop the fuel cell 1 once, a fuel cell stop process is executed (# 82). Then, after the fuel cell stop process is executed, the process proceeds to # 92, which will be described later.

  If it is determined in step # 81 that the set time has not been continued, it is determined whether the operation mode is the automatic operation mode or the manual operation mode (# 83). If there is, the fuel cell operation process of # 91 is executed, and if there is a stop command, the fuel cell stop process of # 90 is executed.

If it is determined in # 83 that the automatic operation mode is selected, it is determined whether or not it is the start time of the operation cycle (# 86), and if it is the start time of the operation cycle, the operation mode setting process is executed. (87).
When it is determined at # 86 that it is not the start point of the operation cycle, or after the operation form setting process is executed at # 87, when continuous operation is set or when it is in intermittent operation When it is time, it is determined that it is the operation timing (# 88), and when it is determined that it is the operation timing, it is determined whether or not the hot water stored in the hot water tank 2 is not full and can be operated. (# 89) If the operation is possible, the fuel cell operation process is executed.
If it is determined in # 88 that the operation timing is not reached, or if it is determined in # 89 that the operation is not possible, a fuel cell stop process is executed (# 90).

  Next, it is determined whether or not a processing flag indicating that it is necessary to perform water quality improvement processing is ON (# 92). If it is determined that the processing flag is not ON, the first duration t1 and A duration measurement process for measuring the second duration t2 is executed (# 93), and the first duration t1 is equal to or longer than the first allowable time L1, or the second duration t2 is equal to or longer than the second allowable time. In this case, the process flag is turned on (# 96).

  If it is determined in # 92 that the processing flag is ON, it is determined whether or not the fuel cell 1 is in a stopped state (# 97). If not, the processing flag is set to ON. It is determined whether or not the waiting time from the waiting time is equal to or longer than the allowable waiting time (for example, 24 hours) (# 98). If the standby time does not reach the standby allowable time, whether or not the end condition is satisfied, that is, whether the total amount of hot water in the hot water tank 2 is within the set low temperature range, or hot water storage It is determined whether or not the total amount of hot and cold water in the tank is within the set high temperature range (# 99), and when the end condition is satisfied, the processing flag is turned off (# 100) and the first continuation A process (# 101) for resetting the time t1 and the second duration t2 to 0 is executed.

  If it is determined in # 97 that the fuel cell 1 is in a stopped state, the process (# 103) for determining whether or not the above-mentioned end condition is satisfied is repeated until the end condition is satisfied. When the end condition is satisfied, processing for turning off the processing flag (# 100) and processing for resetting the first duration time t1 and the second duration time t2 to 0 (# 101) are executed.

  If it is determined in # 98 that the standby time after turning on the processing flag is equal to or longer than the allowable waiting time, a fuel cell stop process is executed to forcibly stop the fuel cell 1 (# 102). Next, the process of determining whether or not the above end condition is satisfied (# 103) is repeated until the end condition is satisfied. When the end condition is satisfied, processing for turning off the processing flag (# 100) and processing for resetting the first duration time t1 and the second duration time t2 to 0 (# 101) are executed.

[Another embodiment]
Next, another embodiment will be described.
(B) In the first embodiment described above, the tank upper hot water temperature sensor St is provided so as to detect the temperature of the hot water in the upper part of the hot water tank 2, but is sent from the upper part of the hot water tank 2 to adjust the temperature. It may be provided in the flow path portion connecting the upper part of the hot water tank 2 and the hot water supply auxiliary heater 24 in the hot water supply passage 17 so as to detect the temperature of the hot water existing in the hot water supply passage 17 without being done.
In the first embodiment, the tank bottom hot water temperature sensor Sb is provided so as to detect the temperature of the hot water at the bottom of the hot water tank 2, but the temperature is adjusted by being sent from the bottom of the hot water tank 2. Alternatively, the hot water storage circuit 18 may be provided in a channel portion connecting the bottom of the hot water tank 2 and the hot water storage heat exchanger 22 so as to detect the temperature of the hot water existing in the hot water storage circuit 18.

(B) In each of the above embodiments, the determination reference temperature at which the hot water supply auxiliary heater 24 serving as the hot water supply heating means is heated is in a temperature range that can be commanded by the operation remote controller R as the hot water supply target temperature command means. Although the case where the set increase temperature (for example, 5 ° C.) is set to the lower limit value is exemplified, the determination reference temperature is set to the lower limit value of the temperature range that can be commanded by the operation remote controller R. Is also possible.
Moreover, the hot water target temperature which is set as a fixed value in advance by the mixing valve 34 as the mixing means for the hot water heated to the heating reference temperature by the auxiliary heater 24 for hot water supply without providing the hot water target temperature command means. In the case of hot water supply adjusted to (for example, 42 ° C.), the determination reference temperature is set to a hot water supply target temperature set in advance as a fixed value. The reference temperature may be set to a temperature obtained by adding a set temperature (for example, 5 ° C.) to a hot water supply target temperature set in advance as a fixed value.

(C) In each of the second and fourth embodiments described above, in the scheduled operation time zone in the operation mode determined in the operation mode setting process, the hot water circulation amount in the hot water storage circuit 18 is normally set as the water quality improvement process. Although the case where the hot water replacement promotion process for reducing the circulation amount for controlling the operation of the hot water circulation pump 19 to control the operation of the hot water circulation pump 19 is executed to be less than the time is illustrated, the water quality improvement process is performed in the scheduled operation time zone as well as the scheduled shutdown time zone. As an alternative, a hot water replacement promotion process for stopping the circulation that controls the operation of the hot water circulation pump 19 to stop the hot water circulation in the hot water storage circuit 18 may be executed.
In this case, the fuel cell 1 is stopped or the radiator 33 is operated while the operation of the fuel cell 1 is continued.
That is, when the circulation of hot water in the hot water storage circuit 18 is stopped, there is no cooling source for cooling the cooling water in the hot water storage heat exchanger 22, so the fuel cell 1 is stopped or the operation of the fuel cell 1 is performed. The radiator 33 is operated while continuing and the cooling water is cooled by the radiator 33.
Also in this case, until the detection temperature of all of the plurality of hot water temperature sensors St, Sm, Sn, Sb reaches the temperature of the set low temperature range, or the detection temperature of the tank upper hot water temperature sensor St becomes the temperature of the set low temperature range. Until that happens, hot water replacement promotion processing is executed.

(D) The method for setting the power generation output for the hot water replacement promotion processing is the method illustrated in the second embodiment, that is, the power generation output set to the power generation output set in the operation mode determined in the operation mode setting processing. It is not limited to the method of setting by multiplying the usage ratio, and for example, a method of setting to the minimum output of the power generation output adjustment range of the fuel cell 1 may be used.

(E) In each of the first and third embodiments, as the water quality improvement process, instead of the hot water delivery stop state heating process, the hot water replacement promotion process is performed in the same manner as described in the second embodiment. May be executed. In this case, the hot water replacement promotion process is executed until the temperature detected by the tank upper hot water temperature sensor St reaches a temperature within the set low temperature range.
In each of the second and fourth embodiments, the hot water supply stop state heating process is executed as the water quality improvement process in the same manner as described in the first embodiment, instead of the hot water replacement promotion process. You may do it. In this case, until the detected temperatures of all of the plurality of hot water temperature sensors St, Sm, Sn, Sb are within the set high temperature range, or the temperature detected by the tank upper hot water temperature sensor St is the temperature in the set low temperature range. Until this time, the hot water delivery stop state heating process is executed.

(F) As the water quality improvement process, in addition to the hot water delivery stop state heating process and the hot water replacement promotion process exemplified in the above embodiment, for example, the total amount of hot water in the hot water tank 2 by drainage means for draining hot water in the hot water tank 2 You may comprise so that the hot water replacement | exchange process which drains and replaces with the water from the water supply path 16 may be performed.

(G) Specific set values of the first set allowable time, the second set allowable time, the set high temperature range, and the heating reference temperature are not limited to the set values exemplified in the above embodiment, and various Can be set to
In the above embodiment, the first setting allowable time and the second setting allowable time are set to the same time, but may be set to different times.

(H) When the hot water replacement promotion process is executed as the water quality improvement process, the fuel cell 1 is operated as described above until the start point of the next operation cycle after the completion condition for ending the water quality improvement process is satisfied. In the second embodiment, the form in which the fuel cell 1 is stopped and the operation of the fuel cell 1 is waited is adopted, but the form in which the fuel cell 1 is operated in the operation form determined in the operation form setting process, or the present You may employ | adopt the form which drives the fuel cell 1 by electric power load follow-up driving | operation.

(I) Separately from the heating unit H, a separate heating means for heating the hot water flowing through the hot water storage circulation path 18 is provided, and in the hot water delivery stop state heating process, the separate heating means is heated. You may comprise, and you may comprise so that both the heating part H and another heating means may be heat-actuated.
For example, by switching the heating medium circulation switching three-way valve 30 to the terminal detour flow state and operating the heating medium circulation pump 21, the heating medium auxiliary heater 25 is heated to operate. The heating medium heated by the auxiliary heater 25 is supplied to the heating medium heating heat exchanger 23, and the hot water flowing through the hot water storage circuit 18 is heated by the heating medium. The separate heating means may be configured by the heat medium circulation path 20, the heat medium auxiliary heater 25, the heat medium circulation pump 21, the heat medium heating heat exchanger 23, and the like.
Alternatively, a direct heating type auxiliary heater (instantaneous water heater, electric heater, or the like) is provided so as to directly heat the hot water flowing through the hot water storage circuit 18, and the direct heating type auxiliary heater is used to You may make it comprise a heating means.

(N) In the hot water replacement promotion process, not only the hot water tank 2 but also hot water in the hot water circulation path 18 and hot water in the hot water supply path 17 are supplied through the water supply path 16 and then heated by the heating unit H. You may comprise so that it may replace with hot water.

(L) The setting method of the setting increase output in the forced continuous operation mode and the forced intermittent operation mode is not limited to the method exemplified in the above embodiment.
For example, a method of setting power with a large set increase rate with respect to the predicted power load, a method of setting to the maximum output in the power generation output adjustment range, or a plurality of temporarily set increase outputs in all stages, A method may be used in which the temporarily set increase output having the maximum predicted energy reduction amount obtained by Expression 8 is set as the set increase output.
Moreover, the setting method of the setting suppression output in the suppression continuous operation mode and the suppression intermittent operation mode is not limited to the method illustrated in the above embodiment.
For example, a method of setting the power with a small set reduction rate with respect to the predicted power load, a method of setting to the minimum output in the power generation output adjustment range, or a total number of temporarily set suppression outputs in a plurality of stages, A method of setting the temporary setting suppression output having the maximum predicted energy reduction amount obtained by Expression 8 as the setting suppression output may be used.

(W) In the above embodiment, the operation mode having the maximum predicted energy reduction amount among the plurality of types of operation modes is determined as the operation mode of the fuel cell 1, and the fuel cell 1 is operated in the determined operation mode. However, the fuel cell 1 may be operated in a preset operation mode, for example, a current power load following operation. Further, among the plurality of types of operation modes, an operation mode in which the predicted carbon dioxide reduction amount is high or the predicted utility cost merit is increased is defined as the fuel cell 1 operation mode, and the fuel cell 1 is operated in the determined operation mode. You may comprise so that it may drive | operate.

(W) In the above embodiment, the heating unit H is illustrated as being configured to use heat generated from the fuel cell 1 as an example of the combined heat and power supply as a heat source, but a gas burner, an electric heater, or an electric type A dedicated heat source such as a heat pump may be provided, and heat generated from an engine-driven heat pump that drives a compressor by a gas engine, a gasoline engine, or the like may be used as a heat source.
When the heating unit H is configured to use heat generated from the combined heat and power supply as a heat source, the combined heat and power supply is not limited to the fuel cell 1 illustrated in the above embodiment, for example, an engine driven rotary type. A power generation device can be applied.

(F) In each of the above embodiments, for example, in the first embodiment, the first continuation time t1 in which the tank upper hot water temperature sensor St continues the state in which the temperature within the set low temperature range is not detected is the first set allowable time L1. At the timing of the water quality improvement processing as described above, the water quality improvement processing is executed, and further, the second duration t2 during which the tank bottom portion hot water temperature sensor Sb continues to detect no temperature within the set high temperature range is set to the second setting. When the water quality improvement processing timing is equal to or longer than the permissible time L1, the water quality improvement processing is executed. In the second embodiment, the plurality of hot water temperature sensors St to Sb do not detect the temperature within the set low temperature range. When the water quality improvement processing timing at which the first continuation time t1 for continuing the water becomes equal to or longer than the first set allowable time L1 is reached, the water quality improvement processing is executed, and a plurality of hot water is added. When the second continuation time t2 during which the temperature sensors St to Sb do not detect the temperature within the set high temperature range is equal to or greater than the second set allowable time L1, the water quality improvement process is executed. In the above example, the second duration t2 is measured in addition to the measurement of the first duration t1, but the configuration for measuring the second duration t2 is omitted, and the second duration t2 is the second set allowable time. By becoming more than L1, it can carry out omitting the composition which performs water quality improvement processing.

As described above, in the case where the second duration t2 is omitted and the second duration t2 is equal to or longer than the second set allowable time L1, the configuration for executing the water quality improvement process is omitted. You may make it increase the structure which resets 1 continuation time t1.
That is, for example, when the first continuation time t1 in which the tank upper hot water temperature sensor St does not detect the temperature within the set low temperature range is equal to or greater than the first set allowable time L1, the water quality improvement process is performed. In the case of execution, when the tank bottom hot water temperature sensor Sb detects a temperature within the set high temperature range before the first duration t1 becomes equal to or longer than the first set allowable time L1, the first duration t1 is reset to 0. Similarly, the plurality of hot water temperature sensors St to Sb detect the temperature within the set low temperature range or the set high temperature until the first duration time t1 becomes equal to or longer than the first set allowable time L1. If a temperature within the range is detected, the first duration t1 can be reset to zero.
Moreover, when the 1st continuation time t1 which continues the state which does not detect the temperature in the setting low temperature range by the some hot water temperature sensors St-Sb becomes the water quality improvement process timing which becomes more than 1st setting permissible time L1, a water quality improvement process will be carried out. In the case of execution, if the tank bottom hot water temperature sensor Sb detects a temperature within the set high temperature range, the first duration t1 can be reset to 0, and similarly, the first duration t1 is the first duration t1. When the plurality of hot water temperature sensors St to Sb detect the temperature within the set high temperature range or the tank upper temperature water temperature sensor St detects the temperature within the set low temperature range before the set allowable time L1 or more, One duration t1 can be configured to be reset to zero.

(Y) In the above embodiment, the case where the plurality of hot water temperature sensors St to Sb are configured by combining the tank upper portion hot water temperature sensor St and the tank bottom portion hot water temperature sensor Sb is illustrated. Instead of the tank bottom hot water temperature sensor Sb, a plurality of hot water temperature sensors may be configured by separately providing an upper hot water temperature sensor and a tank bottom temperature sensor.
And in the said embodiment, although the case where four sensors were juxtaposed as a some hot water temperature sensor St-Sb was illustrated, three sensors may be juxtaposed and five or more sensors are juxtaposed. It can also be implemented.

(T) In the above seventeenth embodiment, when the standby hot water replacement process is performed, the forced stop type hot water replacement process is executed when the standby time exceeds the standby allowable time. Usually, since it is not considered that the operation can be continued continuously over a long period of time, this forced stop hot water replacement process may be omitted.

(L) When executing the hot water replacement promotion process and the standby hot water replacement process as the water quality improvement process, the end conditions for ending the water quality improvement process are all the hot water temperature sensors St, Sm, Sn, Sb. In which the temperature within the set high temperature range is detected, or the set low temperature range is detected by the tank upper hot water temperature sensor St. Furthermore, the hot water discharged from the hot water storage tank 2 The accumulated amount can be set to be a condition that the capacity of the hot water tank 2 or more.

(So) The mixing means constituted by the mixing valve 34 or the like is not necessarily provided as a constituent element of the hot water supply device, for example, when the automatic adjustment type mixing plug is provided at the hot water supply location.

(Tu) In the above embodiment, the hot water storage tank 2 is hermetically sealed and hot water is supplied to the hot water supply path 17 by the water supply pressure of the water supply path 16. However, the hot water storage tank 2 is open to the atmosphere and the hot water supply pump is used. You may comprise so that hot water supply may be carried out by force.

(E) In the above embodiment, when the temperature of the hot water supplied as the hot water supply heating means is lower than the determination reference temperature, the hot water supply heating means 24 heats the hot water to a heating reference temperature that can improve the quality of the hot water. However, when the temperature of the hot water in the upper part of the hot water tank 2 is lower than the judgment reference temperature, the hot water is heated to a heating reference temperature that can improve the quality of the hot water. May be.

(N) In the above embodiment, the case where the hot water supply heating means 24 as the hot water supply heating means is provided as a dedicated hot water supply heating means for heating the hot water flowing through the hot water supply passage 17 is illustrated. However, you may implement in the form combined with the heating means for the heating of the heat-consuming terminal 3.
That is, for example, a heating circulation path that connects a location upstream and downstream of the hot water supply heating means in the hot water supply channel 17 is provided via the heat consuming terminal 3, and hot water is provided in the heating circulation path. By arranging a circulation pump for circulating the heat, the hot water supply heating means can also be used as the heating means for heating the heat consuming terminal 3.

2 Hot water storage tank 5 Operation control means 16 Water supply path 17 Hot water supply path 18 Hot water circulation circuit 19 Hot water circulation means 28 Hot water supply stop means 34 Mixing means H Heating means R Hot water target temperature command means Sb Tank bottom hot water temperature detection means, hot water temperature detection Means Si Feed water temperature detection means Sm Hot water temperature detection means Sn Hot water temperature detection means St Tank upper hot water temperature detection means, hot water temperature detection means

Claims (7)

A hot water storage tank in which water is supplied through a water supply path connected to the bottom and hot water is sent out through a hot water supply path connected to the top;
Hot water circulation means for circulating hot water in the hot water storage tank through the hot water circulation path in the form of returning the hot water taken out from the tank bottom to the upper part of the tank;
Heating means for heating hot water flowing through the hot water circulation circuit;
Heating means for hot water supply for heating hot water flowing through the hot water supply path;
A hot water storage type hot water supply apparatus provided with an operation control means for controlling operation,
A bath upper hot water temperature detecting means for detecting the temperature of hot water present in the hot water supply path without being adjusted by being sent from the upper hot water of the hot water tank or the upper temperature of the hot water tank is provided,
When the non-low temperature duration time during which the operation control means does not detect the temperature within the set low temperature range is not detected by the tank upper hot water temperature detection means becomes the water quality improvement processing timing that is equal to or higher than the set allowable time for low temperature, The water quality improvement process for suppressing the water quality deterioration of the hot water of the water is performed, and the non-low temperature duration time is reset to 0 with the execution of the water quality improvement process,
Regardless of whether or not the water quality improvement process is performed , when the temperature of the hot water supplied to the hot water supply device or the temperature of the hot water in the upper part of the hot water storage tank is lower than the determination reference temperature, It is configured to heat hot water to a heating reference temperature that can improve the water quality of
A hot water storage type hot water supply apparatus in which the set low temperature range is a range lower than the determination reference temperature. A hot water storage tank in which water is supplied through a water supply path connected to the bottom and hot water is sent out through a hot water supply path connected to the top;
Hot water circulation means for circulating hot water in the hot water storage tank through the hot water circulation path in the form of returning the hot water taken out from the tank bottom to the upper part of the tank;
Heating means for heating hot water flowing through the hot water circulation circuit;
Heating means for hot water supply for heating hot water flowing through the hot water supply path;
A hot water storage type hot water supply apparatus provided with an operation control means for controlling operation,
A plurality of hot water temperature detecting means for detecting the temperature of the hot water in the hot water tank is provided at intervals from the bottom to the upper part of the hot water tank,
The operation control means is a water quality improvement process in which a non-low temperature continuation time in which a state in which a temperature higher than a set low temperature range is detected by at least one of the plurality of hot water temperature detection means is equal to or higher than a set allowable time for low temperature When it comes to timing, it is configured to perform a water quality improvement process for suppressing deterioration in the quality of hot water in the hot water storage tank, and to reset the non-low temperature duration to 0 with the execution of the water quality improvement process,
Regardless of whether or not the water quality improvement process is performed , when the temperature of the hot water supplied to the hot water supply device or the temperature of the hot water in the upper part of the hot water storage tank is lower than the determination reference temperature, It is configured to heat hot water to a heating reference temperature that can improve the water quality of
A hot water storage type hot water supply apparatus in which the set low temperature range is a range lower than the determination reference temperature. A hot water supply target temperature command means for changing and setting the hot water supply target temperature is provided,
Mixing means for mixing the hot water from the water supply path with hot water flowing through the hot water supply path after being heated by the heating means for hot water supply and adjusting to the hot water supply target temperature is provided,
The hot water storage type hot water supply apparatus according to claim 1 or 2, wherein the determination reference temperature is a lower limit value of a temperature range that can be commanded by the hot water supply target temperature command means. A hot water supply target temperature command means for changing and setting the hot water supply target temperature is provided,
Mixing means for mixing the hot water from the water supply path with hot water flowing through the hot water supply path after being heated by the heating means for hot water supply and adjusting to the hot water supply target temperature is provided,
The hot water storage type hot water supply apparatus according to claim 1 or 2, wherein the determination reference temperature is a temperature obtained by adding a set increase temperature to a lower limit value of a temperature range that can be commanded by the hot water supply target temperature command means. Hot water delivery stop means is provided that can be switched to a hot water delivery stop state for stopping delivery of hot water from the hot water tank through the hot water supply path,
The operation control means operates the hot water circulation means in a state where the hot water delivery stop means is switched to the hot water delivery stop state as the water quality improvement process, and for the hot water storage different from the heating means or the heating means. The hot water storage type hot water supply apparatus according to any one of claims 1 to 4, wherein the hot water supply stop state heating process is performed to heat another hot means for heating hot water flowing through the circulation path. . The hot water at the upper part of the hot water tank or the hot water temperature detecting means for detecting the temperature of hot water that is sent from the upper part of the hot water tank and the temperature of the hot water is not adjusted, or the bottom of the hot water tank A plurality of hot water temperature detection means for detecting the temperature of the hot water in the hot water storage tank is disposed at intervals from the upper part,
The operation control means, as the water quality improvement processing, until the temperature within the set low temperature range is detected by the tank upper hot water temperature detection means, or the set low temperature range in all of the plurality of hot water temperature detection means Until the temperature inside is detected, the operation of the hot water circulation means is controlled so that the amount of hot water circulation in the hot water circulation circuit is made smaller than normal or the circulation of hot water in the hot water circulation circuit is stopped. The hot water storage type hot water supply apparatus according to any one of claims 1 to 4, wherein the hot water replacement promotion process for controlling the operation of the hot water circulation means is executed. The hot water at the upper part of the hot water tank or the hot water temperature detecting means for detecting the temperature of hot water that is sent from the upper part of the hot water tank and the temperature of the hot water is not adjusted, or the bottom of the hot water tank A plurality of hot water temperature detection means for detecting the temperature of the hot water in the hot water storage tank is disposed at intervals from the upper part,
The operation control means stops the operation of the heating means when the heating means is operating and the hot water circulation means is operating when the water quality improvement processing timing is reached as the water quality improvement processing. When the operation stop condition is satisfied and the operation of the heating means and the operation of the hot water circulation means are stopped, the tank upper hot water temperature detection means falls within the set low temperature range. Until the temperature of the hot water is detected, or until the temperature within the set low temperature range is detected by all of the plurality of hot water temperature detecting means, and the operation of the heating means and the operation of the hot water circulating means are stopped. The hot water storage type hot water supply apparatus according to any one of claims 1 to 4, wherein the hot water replacement process is configured to execute hot water replacement processing.

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