JP6493369B2 - Water heater - Google Patents

Description

  The present invention relates to a hot water supply apparatus.

  Conventionally, as a hot water supply apparatus, there is one that includes a bypass pipe provided with a heat recovery device as a water side pipe of a bath circuit, and uses the bypass pipe as a common pipe part with the water side pipe of the hot water supply circuit (for example, JP, 2011-12845, A (patent documents 1) reference).

JP2011-12845A

  By the way, in the above hot water supply apparatus, when performing normal hot water supply without heat recovery after hot water supply for recovering the heat of the bath, the temperature of the water left by heat recovery is supplied from the outside to the bypass pipe, which is a common pipe part. If the water temperature is higher than the target hot water temperature, the hot water in the upper part of the hot water tank and the water supplied from the outside are mixed by the hot water mixing valve of the hot water supply circuit to supply hot water. There is a problem that hot water comes out.

  Accordingly, an object of the present invention is to provide a hot water supply apparatus that can prevent hot water remaining in a pipe at the start of hot water supply from being mixed by a hot water supply mixing valve and hot water having a temperature higher than a target hot water supply temperature.

In order to solve the above problems, the hot water supply apparatus of the present invention is:
It has at least one of the common pipe part of the water side pipe of the bath circuit and the water side pipe of the hot water supply circuit related to the hot water of the bath or the common pipe part of the pipe of the boiling circuit and the hot water side pipe of the hot water supply circuit A water heater,
Based on the temperature of the hot water in the upper part of the hot water storage tank and the temperature of the water supplied from the outside, the mixing valve opening for calculating the target opening of the hot water mixing valve for supplying hot water of the target hot water temperature from the hot water supply circuit A calculation unit;
If it is determined that water having a temperature higher than the normal temperature is left in the common pipe portion, the hot water in the upper part of the hot water storage tank and the water supplied from the outside are mixed by the hot water supply mixing valve of the hot water supply circuit. Hot water mixing valve opening correction unit for correcting the opening degree of the hot water mixing valve so that the mixing ratio of water is higher than the target opening degree,
A hot water mixing valve control unit that controls the hot water mixing valve based on the target opening calculated by the mixing valve opening calculation unit and the opening corrected by the hot water mixing valve opening correction unit. It is characterized by that.

  Here, the normal temperature is the temperature of the water supplied from the outside in the hot water supply operation by the hot water supply circuit in the common pipe part of the water side pipe of the bath circuit and the water side pipe of the hot water supply circuit. The temperature of the hot water in the upper part of the hot water storage tank used in the hot water supply operation by the hot water supply circuit is in the common pipe portion of the hot water supply pipe of the hot water supply circuit.

  According to the above configuration, for example, when the water side pipe of the bath circuit and the water side pipe of the hot water supply circuit have a common pipe part, the normal temperature (supplied from the outside) is supplied to the common pipe part by the operation using the bath circuit. When the hot water mixing valve of the hot water supply circuit mixes the hot water in the upper part of the hot water storage tank with the water supplied from the outside, The opening degree of the hot water mixing valve is corrected by the valve opening degree correction unit so that the mixing ratio of water is higher than the target opening degree. Based on the opening corrected by the hot water mixing valve opening correcting unit, the hot water mixing valve control unit controls the hot water mixing valve. At this time, if all the water left in the common piping part is used for hot water supply, the hot water mixing valve control unit controls the hot water mixing valve based on the target opening calculated by the mixing valve opening calculation unit What is necessary is just to perform normal hot water supply operation.

  In this way, by appropriately controlling the opening degree of the hot water supply mixing valve for the hot water supply operation after the operation using the bath circuit, for example, the operation of cooling and warming the hot water in the bath, It is possible to prevent the hot water remaining in the common piping portion from being mixed by the hot water supply mixing valve and hot water having a temperature higher than the target hot water supply temperature.

  Alternatively, when the piping of the boiling circuit and the hot water side piping of the hot water supply circuit have a common piping part, the normal temperature (the temperature of the hot water in the upper part of the hot water storage tank) ) When it is determined that hot water with a temperature higher than that is left, when the hot water mixing valve of the hot water supply circuit mixes the hot water in the upper part of the hot water storage tank with the water supplied from the outside, the hot water mixing valve opening correction is performed. The opening of the hot water supply mixing valve is corrected by the unit so that the mixing ratio of water is higher than the target opening. Based on the opening corrected by the hot water mixing valve opening correcting unit, the hot water mixing valve control unit controls the hot water mixing valve. At this time, if all the hot water left in the common piping part is used for hot water supply, the hot water mixing valve control unit controls the hot water mixing valve based on the target opening calculated by the mixing valve opening calculation unit What is necessary is just to perform normal hot water supply operation.

  Also in this case, the hot water remaining in the common pipe part at the start of hot water supply is mixed by the hot water supply mixing valve by appropriately controlling the opening degree of the hot water supply mixing valve for the hot water supply operation after the operation using the boiling circuit. Thus, hot water having a temperature higher than the target hot water supply temperature can be prevented from being discharged.

Moreover, in the hot water supply apparatus of one embodiment,
When the hot water mixing valve opening correction unit determines that water having a temperature higher than the normal temperature remains in the common pipe portion, the hot water mixing valve opening correction unit sets the opening of the hot water mixing valve to the target even when hot water is stopped. Correction is performed by a preset correction value so that the mixing ratio of water is higher than the opening.

  According to the above embodiment, the hot water mixing valve opening correction unit corrects the opening of the hot water mixing valve by a preset correction value so that the mixing ratio of water is higher than the target opening. The opening degree control can be simplified.

Moreover, in the hot water supply apparatus of one embodiment,
The hot water mixing valve opening correction unit is based on the temperature of the upper hot water in the hot water storage tank and the temperature of the water on the water side of the hot water mixing valve or the temperature of the lower water in the hot water storage tank. Then, a correction value for calculating the opening degree of the hot water supply mixing valve so that the mixing ratio of water is higher than the target opening degree is calculated.

  According to the embodiment, the hot water mixing valve opening correction unit for correcting the opening of the hot water mixing valve so that the mixing ratio of water is higher than the target opening, the temperature of the hot water in the upper part of the hot water storage tank, Based on the temperature of the water on the water side of the hot water mixing valve (or the temperature of the water in the lower part of the hot water storage tank), the correction value that makes the water mixing ratio higher than the target opening is calculated. . Accordingly, it is possible to reduce the hot water temperature overshoot at the start of hot water supply by the hot water supply circuit and bring the hot water temperature close to the target hot water temperature.

Moreover, in the hot water supply apparatus of one embodiment,
The temperature of the water on the water side of the hot water mixing valve is determined based on the temperature of the water supplied from the outside on the water side of the hot water mixing valve stored in the past.

  According to the above embodiment, the hot water mixing valve opening correction unit is supplied from the temperature of the hot water in the upper part of the hot water storage tank and from the outside of the water side of the hot water mixing valve stored when hot water was supplied in the past. Based on the temperature of the water, the correction value is determined so that the mixing ratio of water is higher than the target opening for the opening of the hot water mixing valve. Thereby, the hot-water supply temperature at the time of the hot-water supply start by the said hot-water supply circuit can be correctly made into target hot-water supply temperature.

Moreover, in the hot water supply apparatus of one embodiment,
The hot water mixing valve control unit is configured so that the hot water supply circuit starts from the time when hot water supply by the hot water supply circuit is started in a state where the opening degree of the hot water mixing valve is corrected so that the mixing ratio of water is higher than the target opening degree. When the hot water supply satisfies either one of the conditions that the preset opening time of the hot water supply continues or the condition that the integrated flow rate of the hot water supply by the hot water supply circuit is equal to or higher than the preset opening return integrated flow rate, The opening of the mixing valve is held for a preset holding time at a return opening on the hot water side with respect to the target opening.

  According to the above embodiment, the hot water mixing valve control unit is configured to correct the opening degree of the hot water mixing valve so that the mixing ratio of water is higher than the target opening degree, when hot water supply by the hot water supply circuit is started. When hot water supply by the hot water supply circuit continues for a preset opening return time, the hot water mixing valve opening is held for a preset holding time at the return opening on the hot water side from the target opening, so at the start of hot water supply It is possible to control the hot water supply temperature so as to quickly reach the target hot water temperature while preventing the hot water supply temperature from becoming higher than the target hot water temperature.

  Alternatively, the hot water supply mixing valve control unit is configured so that the hot water supply circuit starts from the time when hot water supply by the hot water supply circuit is started in a state where the opening of the hot water supply mixing valve is corrected so that the mixing ratio of water is higher than the target opening. When the integrated flow rate of hot water is equal to or higher than the preset opening return integrated flow rate, the hot water mixing valve opening is held for a preset holding time at the return opening on the hot water side from the target opening. It is possible to control the hot water supply temperature so as to quickly reach the target hot water temperature while preventing the hot water supply temperature at the start from becoming higher than the target hot water temperature.

Moreover, in the hot water supply apparatus of one embodiment,
The hot water mixing valve control unit is configured so that the hot water supply circuit starts from the time when hot water supply by the hot water supply circuit is started in a state where the opening degree of the hot water mixing valve is corrected so that the mixing ratio of water is higher than the target opening degree. When the condition that the hot water supply continues for a preset opening degree return time and the condition that the accumulated flow rate of hot water supply by the hot water supply circuit is equal to or greater than the opening degree return integrated flow rate, the opening degree of the hot water mixing valve is set to the target value. The holding time is held at the return opening on the hot water side rather than the opening.

  According to the above embodiment, the hot water supply mixing valve control unit starts the hot water supply from the time when hot water supply by the hot water supply circuit is started in a state where the opening of the hot water supply mixing valve is corrected so that the mixing ratio of water is higher than the target opening. When the hot water supply by the circuit continues for the opening return time, and when the accumulated flow rate of hot water supplied by the hot water supply circuit is equal to or greater than the integrated return flow rate of the hot water supply, the opening of the hot water mixing valve is returned to the hot water side from the target opening. Since the holding time is maintained at a degree, the hot water supply temperature at the start of hot water supply can be controlled so as to quickly reach the target hot water supply temperature while preventing the hot water supply temperature from becoming higher than the target hot water supply temperature.

Moreover, in the hot water supply apparatus of one embodiment,
The hot water mixing valve control unit is configured so that the hot water temperature of the hot water supply circuit becomes the target hot water temperature from a state where the opening degree of the hot water mixing valve is corrected so that the mixing ratio of water is higher than the target opening degree. When returning the opening degree of the hot water supply mixing valve, the feedback control start time from which the hot water supply by the hot water supply circuit is set in advance is continued from the time when the opening degree of the hot water supply mixing valve is set to a return opening side of the hot water side from the target opening degree. When satisfying either of the conditions for the hot water supply or the condition that the accumulated flow rate of the hot water supply by the hot water supply circuit is equal to or greater than the preset feedback control start accumulated flow rate, the hot water supply temperature of the hot water supply circuit becomes the target hot water supply temperature. Then, the opening degree of the hot water mixing valve is feedback controlled.

  According to the above embodiment, the hot water mixing valve control unit opens the hot water mixing valve when returning the opening degree of the hot water mixing valve to the target opening degree from the state where the water mixing ratio is corrected to be higher than the target opening degree. Opening of the hot water mixing valve so that the hot water temperature of the hot water supply circuit becomes the target hot water temperature when the hot water supply by the hot water supply circuit continues for the feedback control start time from the time when the temperature is set to the return opening on the hot water side of the target opening Feedback control. As a result, the hot water supply temperature at the start of hot water supply by the hot water supply circuit is quickly made equal to the target hot water supply temperature, and then hot water supply at a stable hot water supply temperature can be performed by feedback control.

  Alternatively, the hot water mixing valve control unit opens the opening of the hot water mixing valve when the opening degree of the hot water mixing valve is returned from the corrected state so that the mixing ratio of water is higher than the target opening degree. When the integrated flow rate of hot water supplied by the hot water supply circuit is equal to or higher than the preset feedback control start integrated flow rate from the point of time when the return opening is closer to the hot water side than the normal temperature, the hot water supply temperature of the hot water supply circuit is set to the target hot water supply temperature. Feedback control of the opening degree of the hot water mixing valve. As a result, the hot water supply temperature at the start of hot water supply by the hot water supply circuit is quickly made equal to the target hot water supply temperature, and then hot water supply at a stable hot water supply temperature can be performed by feedback control.

Moreover, in the hot water supply apparatus of one embodiment,
The hot water mixing valve control unit says that the hot water supply by the hot water supply circuit continues for a preset feedback control start time from the time when the opening degree of the hot water mixing valve is set to a return opening side of the hot water side with respect to the target opening degree. When the condition and the condition that the accumulated flow rate of hot water supplied by the hot water supply circuit is equal to or greater than the feedback control start accumulated flow rate, the opening degree of the hot water mixing valve is fed back so that the hot water temperature of the hot water circuit becomes the target hot water temperature. Control.

  In addition, the hot water mixing valve control unit is configured such that when the hot water supply by the hot water supply circuit continues for the feedback control start time from the time when the opening degree of the hot water mixing valve is set to the return opening on the hot water side from the target opening, and by the hot water supply circuit When the integrated flow rate of hot water becomes equal to or greater than the feedback control start integrated flow rate, the opening degree of the hot water mixing valve is feedback controlled so that the hot water temperature of the hot water supply circuit becomes the target hot water temperature. As a result, the hot water supply temperature at the start of hot water supply by the hot water supply circuit is quickly made equal to the target hot water supply temperature, and then hot water supply at a stable hot water supply temperature can be performed by feedback control.

Moreover, in the hot water supply apparatus of one embodiment,
The hot water mixing valve control unit corrects the opening degree of the hot water mixing valve so that the mixing ratio of water is higher than the target opening degree, and hot water supply by the hot water supply circuit is set to a target opening return hot water set in advance. The hot water supply temperature of the hot water supply circuit is the target hot water supply when either one of the conditions that the time continues or the integrated flow rate of hot water supplied by the hot water supply circuit is equal to or greater than a preset target opening return integrated flow rate is satisfied. The opening degree of the hot water supply mixing valve is returned so that the temperature is reached.

  According to the above embodiment, the hot water mixing valve control unit corrects the opening degree of the hot water mixing valve so that the mixing ratio of water is higher than the target opening degree, and then the target opening is started after hot water supply by the hot water supply circuit is started. When the hot water returning time is continued, all the water left in the common pipe part is used for hot water supply. As a result, the hot water supply temperature is adjusted so that hot water having a temperature lower than the target hot water temperature does not come out at the start of the next hot water supply in a state where the opening degree of the hot water supply mixing valve is corrected so that the mixing ratio of water is higher than the target opening degree. It is possible to return to the hot water supply mixing valve opening degree control to reach the target hot water supply temperature.

  Further, the hot water mixing valve control unit corrects the opening degree of the hot water mixing valve so that the mixing ratio of water is higher than the target opening degree, and the target opening degree in which the integrated flow rate of hot water supplied by the hot water supply circuit is set in advance. When the return integrated flow rate is exceeded, all the water left in the common pipe part is used for hot water supply. As a result, the hot water supply temperature is adjusted so that hot water having a temperature lower than the target hot water temperature does not come out at the start of the next hot water supply in a state where the opening degree of the hot water supply mixing valve is corrected so that the mixing ratio of water is higher than the target opening degree. It is possible to return to the hot water supply mixing valve opening degree control to reach the target hot water supply temperature.

Moreover, in the hot water supply apparatus of one embodiment,
The hot water mixing valve control unit corrects the opening degree of the hot water mixing valve so that the mixing ratio of water is higher than the target opening degree, and hot water supply by the hot water supply circuit is set to a target opening return hot water set in advance. When the condition that the time is continued and the condition that the integrated flow rate of hot water supply by the hot water supply circuit is equal to or greater than a preset target opening return integrated flow rate is satisfied, the hot water supply temperature of the hot water supply circuit becomes the target hot water supply temperature. To return the opening of the hot water mixing valve.

  According to the above embodiment, the hot water supply mixing valve control unit corrects the opening degree of the hot water supply mixing valve so that the mixing ratio of water is higher than the target opening degree. When the hot water resumption time continues, and when the accumulated hot water flow rate of the hot water supply circuit is equal to or higher than the preset target opening return integrated flow rate, all the water left in the common pipe is not left. To be used. As a result, the hot water supply temperature is adjusted so that hot water having a temperature lower than the target hot water temperature does not come out at the start of the next hot water supply in a state where the opening degree of the hot water supply mixing valve is corrected so that the mixing ratio of water is higher than the target opening degree. It is possible to return to the hot water supply mixing valve opening degree control to reach the target hot water supply temperature.

Moreover, in the hot water supply apparatus of one embodiment,
The bath circuit has a bath filling circuit that mixes hot water in the upper part of the hot water storage tank and water supplied from the outside to supply hot water to the bath,
The hot water mixing valve control unit corrects the opening degree of the hot water mixing valve so that the mixing ratio of water is higher than the target opening degree, and the hot water supply by the bath hot water filling circuit is set in advance. When satisfying either the condition that the opening-returning hot water filling time is continued or the condition that the accumulated flow rate of hot water supply by the bath hot water filling circuit is equal to or greater than the preset target opening returning hot water filling integrated flow rate The opening degree of the hot water supply mixing valve is returned so that the hot water supply temperature of the hot water supply circuit becomes the target hot water supply temperature.

  According to the above embodiment, the hot water supply valve control unit sets the hot water supply by the bath hot water supply circuit in a state where the opening degree of the hot water supply mixing valve is corrected so that the mixing ratio of water is higher than the target opening degree. When the target opening degree recovery hot water filling time is continued, the water left in the common pipe part is not left and used for hot water bath filling. As a result, the hot water supply temperature is adjusted so that hot water having a temperature lower than the target hot water temperature does not come out at the start of the next hot water supply in a state where the opening degree of the hot water supply mixing valve is corrected so that the mixing ratio of water is higher than the target opening degree. It is possible to return to the hot water supply mixing valve opening degree control to reach the target hot water supply temperature.

  Alternatively, the hot water supply mixing valve control unit has preset the integrated flow rate of hot water supply by the bath hot water supply circuit in a state where the opening degree of the hot water supply mixing valve is corrected so that the mixing ratio of water is higher than the target opening degree. When the target opening degree return hot water filling integrated flow rate or more is reached, the water left in the common pipe portion is not left and used for hot water filling of the bath. As a result, the hot water supply temperature is adjusted so that hot water having a temperature lower than the target hot water temperature does not come out at the start of the next hot water supply in a state where the opening degree of the hot water supply mixing valve is corrected so that the mixing ratio of water is higher than the target opening degree. It is possible to return to the hot water supply mixing valve opening degree control to reach the target hot water supply temperature.

Moreover, in the hot water supply apparatus of one embodiment,
The bath circuit has a bath filling circuit that mixes hot water in the upper part of the hot water storage tank and water supplied from the outside to supply hot water to the bath,
The hot water mixing valve control unit presets the integrated flow rate of hot water supply by the bath hot water filling circuit in a state where the opening degree of the hot water mixing valve is corrected so that the mixing ratio of water is higher than the target opening degree. Of the hot water supply circuit when the condition that the target hot water replenishment time is maintained and the hot water supply by the bath hot water filling circuit is equal to or greater than the preset target opening return hot water integrated flow rate is satisfied. The opening degree of the hot water supply mixing valve is returned so that the hot water supply temperature becomes the target hot water supply temperature.

  According to the above embodiment, the hot water supply mixing valve control unit corrects the opening degree of the hot water supply mixing valve so that the mixing ratio of water is higher than the target opening degree, and the integrated flow rate of the hot water supply by the bath hot water supply circuit When the preset target opening return hot water filling time has continued and when the hot water supply by the bath hot water filling circuit exceeds the preset target opening return hot water filling integrated flow rate, The remaining water is used for bath filling. As a result, the hot water supply temperature is adjusted so that hot water having a temperature lower than the target hot water temperature does not come out at the start of the next hot water supply in a state where the opening degree of the hot water supply mixing valve is corrected so that the mixing ratio of water is higher than the target opening degree. It is possible to return to the hot water supply mixing valve opening degree control to reach the target hot water supply temperature.

Moreover, in the hot water supply apparatus of one embodiment,
The hot-water supply mixing valve control unit, when a preset target opening return time elapses from the time when the opening degree of the hot-water supply mixing valve is corrected so that the mixing ratio of water is higher than the target opening degree, The opening degree of the hot water mixing valve is returned so that the hot water temperature of the circuit becomes the target hot water temperature.

  According to the above-described embodiment, the hot water mixing valve control unit corrects the opening degree of the hot water mixing valve so that the mixing ratio of water is higher than the target opening degree. When the time has elapsed, the opening degree of the hot water supply mixing valve is returned so that the hot water supply temperature of the hot water supply circuit becomes the target hot water supply temperature. At this time, the opening degree of the hot water supply mixing valve is set by setting the target opening degree return time so that the water remaining in the common pipe part becomes the same as the temperature of the water supplied from the outside by natural heat dissipation. The hot water mixing valve opening that sets the hot water temperature to the target hot water temperature so that hot water at a temperature lower than the target hot water temperature does not come out at the start of the next hot water supply in a state where the mixing ratio of water is higher than the target opening You can return to control.

Moreover, in the hot water supply apparatus of one embodiment,
The bath circuit is
A bath circulation circuit that circulates hot water from the bath through a heat exchanger;
A bath cooling circuit that circulates the water in the lower part of the hot water storage tank through the reheating heat exchanger and cools the hot water in the bath to make it warm.
The water side piping of the bath cooling circuit and the water side piping of the hot water supply circuit have a common piping portion.

  According to the above embodiment, since the water-side piping of the bath cooling circuit and the water-side piping of the hot water supply circuit have a common piping portion, the hot water of the bath is recirculated through the heat exchanger by the bath circulation circuit. In the state, when the bath cooling operation is performed to cool the bath water by using the bath cooling circuit to recirculate the water in the lower part of the hot water tank through the heat exchanger and cool the hot water in the bath, Water in a temperature higher than the temperature of water supplied from the outside is left in the pipe portion. In this state, by correcting the opening of the hot water supply mixing valve so that the mixing ratio of water is higher than the target opening, the hot water remaining in the common piping at the start of hot water supply is mixed with the hot water in the hot water storage tank. It is possible to prevent hot water having a temperature higher than the temperature from coming out.

Moreover, in the hot water supply apparatus of one embodiment,
The hot water mixing valve control unit corrects the opening degree of the hot water mixing valve so that the mixing ratio of water is higher than the target opening degree when the bath cooling circuit starts cooling the hot water of the bath.

  According to the above-described embodiment, when cooling of hot water in the bath is started by the bath cooling circuit, the hot water mixing valve control unit corrects the opening degree of the hot water mixing valve so that the water mixing ratio is higher than the target opening degree. Therefore, even if hot water is supplied by the hot water supply circuit during the bath cooling operation, water having a temperature higher than the externally supplied water existing in the common piping part is mixed with the hot water in the hot water storage tank at the start of hot water supply. Thus, hot water having a temperature higher than the target hot water supply temperature can be prevented from being discharged. Here, when hot water supply by the hot water supply circuit is performed during the bath cooling operation, the bath cooling operation is stopped.

Moreover, in the hot water supply apparatus of one embodiment,
A bath cooling control unit for controlling the bath cooling circuit;
The bath cooling control unit does not cool the hot water of the bath by the bath cooling circuit when the temperature of the lower water in the hot water storage tank is equal to or higher than the bath cooling prohibition temperature.

  According to the above embodiment, the bath cooling control unit does not cool the bath water by the bath cooling circuit when the temperature of the lower water in the hot water storage tank is equal to or higher than the bath cooling prohibition temperature (for example, 35 ° C.). Thereby, since the temperature difference between the water in the lower part of the hot water storage tank and the hot water temperature of the bath is small, bath cooling operation in which cooling cannot be sufficiently performed can be prohibited.

Moreover, in the hot water supply apparatus of one embodiment,
The bath cooling control unit is configured such that the temperature of the lower water in the hot water storage tank is equal to or higher than the bath cooling prohibition temperature, and the temperature of the lower water in the hot water storage tank and the temperature of the water supplied from the outside. When the difference is not less than the bath cooling prohibition temperature difference, the bath water is not cooled by the bath cooling circuit.

  According to the above embodiment, the bath cooling control unit is configured such that when the temperature of the lower water in the hot water storage tank is equal to or higher than the bath cooling prohibition temperature (for example, 35 ° C.), the temperature of the lower water in the hot water storage tank and When the temperature difference with the temperature of the supplied water is equal to or greater than the bath cooling prohibition temperature difference (for example, 15 ° C.), bath water is not cooled by the bath cooling circuit. This makes it possible to prohibit bath cooling operation where cooling is not possible because the temperature difference between the lower water in the hot water tank and the lower limit of the bath set temperature is small, and the temperature of the lower water in the hot water tank is supplied from the outside. When the temperature difference from the temperature of the water to be produced is large, the hot water supply temperature can be prevented from overshooting at the start of hot water supply after the bath cooling operation.

Moreover, in the hot water supply apparatus of one embodiment,
A bath cooling control unit that controls the bath cooling circuit is provided. The bath cooling control unit does not cool the hot water of the bath by the bath cooling circuit during hot water supply by the hot water supply circuit.

  According to the above embodiment, the bath cooling control unit prevents the bath water from being cooled by the bath cooling circuit during the hot water supply by the hot water supply circuit. The present invention can be applied to a hot water supply apparatus having a circuit configuration in which the bath cooling circuit and the hot water supply circuit cannot be used at the same time for the common pipe portion with the side pipe.

Moreover, in the hot water supply apparatus of one embodiment,
The hot water side piping of the boiling circuit and the hot water side piping of the hot water supply circuit have a common piping part,
The hot water mixing valve control unit corrects the opening degree of the hot water mixing valve so that the mixing ratio of water is higher than the target opening degree when the boiling circuit starts boiling of hot water in the hot water storage tank. To do.

  According to the above embodiment, since the hot water side piping of the boiling circuit and the hot water side piping of the hot water supply circuit have a common piping portion, when the boiling circuit starts boiling the hot water in the hot water storage tank, After the operation, water having a temperature higher than usual is left in the common pipe portion. In this state, by correcting the opening of the hot water supply mixing valve so that the mixing ratio of water is higher than the target opening, hot water remaining in the common pipe portion at the start of hot water supply is mixed with water by the hot water supply mixing valve. It is possible to prevent hot water having a temperature higher than the target hot water supply temperature from coming out.

Moreover, in the hot water supply apparatus of one embodiment,
The hot water mixing valve opening correction unit, during the boiling operation by the boiling circuit, the temperature of the hot water in the upper part of the hot water storage tank is lower than the hot water temperature of the heat pump unit connected to the boiling circuit, In addition, when the temperature difference between the hot water temperature and the temperature of the hot water in the upper part of the hot water storage tank is equal to or higher than a preset temperature, the water mixing ratio of the hot water mixing valve is higher than the target opening. Correct as follows.

  According to the above embodiment, during the boiling operation by the boiling circuit, the temperature of the hot water in the upper part of the hot water storage tank is lower than the temperature of the hot water of the heat pump unit, and the temperature of the hot water and the temperature of the hot water in the upper part of the hot water tank If the temperature difference between the two is higher than the preset temperature, the hot water mixing valve opening is corrected so that the mixing ratio of water is higher than the target opening, so that Even if hot water having a temperature higher than the preset temperature is higher than that of the hot water in the common pipe part, and the hot water left in the common pipe part is mixed with water by the hot water mixing valve, the target hot water temperature is maintained. It is possible to prevent hot water from coming out. On the other hand, if the temperature of the hot water in the upper part of the hot water storage tank is lower than the hot water temperature of the heat pump unit, but the temperature difference between the hot water temperature and the temperature of the hot water in the upper part of the hot water storage tank is less than the preset temperature, By not correcting the opening of the mixing valve, it is possible to prevent the hot water supply temperature from becoming unstable at the start of hot water supply.

Moreover, in the hot water supply apparatus of one embodiment,
A reheating circuit that recirculates hot water in the upper part of the hot water storage tank and circulates it through a heat exchanger to replenish the hot water in the bath,
The hot water mixing valve opening correction unit adjusts the opening of the hot water mixing valve from the target opening when the reheating operation by the reheating circuit and the boiling operation by the boiling circuit are performed simultaneously. Correct so that becomes higher.

  According to the above embodiment, when the reheating operation by the reheating circuit and the boiling operation by the reheating circuit are performed simultaneously, the temperature of the hot water in the upper part of the hot water storage tank is lowered by reheating operation during the reheating operation. When the temperature difference between the tapping temperature of the heat pump unit connected to the boiling circuit and the temperature of the hot water in the upper part of the hot water storage tank becomes large, the opening ratio of the hot water mixing valve is set to the water mixing ratio from the target opening. It can correct | amend so that it may become high and it can prevent that hot water higher than target hot-water supply temperature comes out.

  As is clear from the above, according to the present invention, by appropriately controlling the opening of the hot water supply mixing valve with respect to the hot water supply operation, hot water remaining in the pipe at the start of hot water supply is mixed by the hot water supply mixing valve, and the target hot water supply temperature is reached. Therefore, it is possible to realize a hot water supply apparatus that can prevent hotter hot water from coming out.

FIG. 1 is a piping system diagram of a hot water supply apparatus according to a first embodiment of the present invention. FIG. 2 is a diagram showing the flow of hot water during the boiling operation of the water heater. FIG. 3 is a diagram showing the flow of hot water during the hot water filling operation of the hot water supply apparatus. FIG. 4 is a diagram showing the flow of hot water during the reheating operation of the hot water supply apparatus. FIG. 5 is a diagram showing the flow of hot water during the bath cooling operation of the hot water supply apparatus. FIG. 6 is a diagram showing the flow of hot water during the hot water supply operation of the hot water supply apparatus. FIG. 7 is a view showing changes in the opening degree of the hot water mixing valve and the hot water temperature during the bath cooling operation of the hot water supply apparatus. FIG. 8 is a view for explaining conditions under which the bath cooling operation of the hot water supply apparatus is possible. FIG. 9 is a piping system diagram of a hot water supply apparatus according to a third embodiment of the present invention. FIG. 10 is a diagram showing the flow of hot water during the boiling operation of the hot water supply apparatus. FIG. 11 is a diagram showing the flow of hot water during the hot water supply operation of the hot water supply apparatus.

  Hereinafter, a hot water supply apparatus of the present invention will be described in detail with reference to embodiments shown in the drawings.

[First Embodiment]
FIG. 1 shows a piping system diagram of a hot water supply apparatus according to the first embodiment of the present invention.

  As shown in FIG. 1, the hot water supply apparatus includes a hot water storage unit 1 having a hot water storage tank 10 and a heat pump unit 2 for boiling water in the hot water storage tank 10 of the hot water storage unit 1.

<Boiling circuit>
One end of the pipe L1 is connected to the lower part of the hot water storage tank 10, and the other end of the pipe L1 is connected to the first water inlet port of the pump water inlet valve V1. One end of the pipe L2 is connected to the water outlet port of the pump water inlet valve V1, and the other end of the pipe L2 is connected to the water inlet port of the bypass valve V2. A boiling pump P1 is disposed in the pipe L2. Moreover, it connects to the end of the heat exchange part 2a of the heat pump unit 2 via the piping L3 to the 1st water discharge port of the bypass valve V2. The other end of the pipe L26 is connected to the second water inlet port of the pump water inlet valve V1.

  The other end of the heat exchanging part 2a of the heat pump unit 2 is connected to one end of the pipe L4, and the other end of the pipe L4 is connected to the water inlet port of the boiling three-way valve V3. Further, one end of the pipe L6 is connected to the second water discharge port of the bypass valve V2, and the other end of the pipe L6 is connected to the boiling three-way valve V3 side of the pipe L4.

  Further, one end of the pipe L5 is connected to the first water discharge port of the boiling three-way valve V3, and the other end of the pipe L5 is connected to the upper part of the hot water storage tank 10. On the other hand, one end of the pipe L7 is connected to the second water discharge port of the boiling three-way valve V3, and the other end of the pipe L7 is connected to the lower part of the hot water storage tank 10.

  The piping L1 to L5, L7, the pump inlet valve V1, the boiling pump P1, the bypass valve V2, and the boiling three-way valve V3 constitute a boiling circuit between the hot water storage tank 10 and the heat pump unit 2.

  In FIG. 1, the pump inlet valve V1 shows a state where the pipe L2 and the pipe L26 are in communication, the bypass valve V2 shows a state where the pipe L2 and the pipe L3 are in communication, and the boiling three-way valve V3 is a pipe L4. And a state where the pipe L7 is in communication.

  One end of a drainage pipe L27 provided with a drainage two-way valve 27 is connected to the hot water storage tank 10 side of the pipe L1 from the pump inlet valve V1. Normally, the drainage two-way valve 27 is closed, and when draining the water in the hot water storage tank 10 for maintenance or the like, the drainage two-way valve 27 is opened to allow the lower part of the hot water storage tank 10 and the drain outlet to communicate with each other.

  By the boiling pump P1, the hot water in the hot water storage tank 10 is supplied to the pipe L1, the pump water inlet valve V1, the bypass valve V2, the heat exchange part 2a of the heat pump unit 2, the pipe L4, the boiling three-way valve V3 and the pipe L5 (or L7). Circulate through.

<Bath bathing circuit>
Next, an external water supply port is connected to the lower part of the hot water storage tank 10 through a water supply pipe L11. In the water supply pipe L11, a strainer 11, a check valve 12 that allows only a flow from the water supply pipe side to the hot water storage tank 10 side, and a pressure reducing valve V10 are sequentially arranged from the upstream side.

  Moreover, one end of the pipe L21 is connected to the upper part of the hot water storage tank 10, and the other end of the pipe L21 is connected to the first water inlet port of the hot water filling mixing valve V4. A check valve 21 that allows only a flow from the hot water storage tank 10 side to the hot water mixing valve V4 side is disposed near the hot water mixing valve V4 of the pipe L21.

  One end of the branch pipe L12 is connected to the second water inlet port of the hot water mixing valve V4, and the other end of the branch pipe L12 is connected to the upstream side of the pressure reducing valve V10 of the water supply pipe L11. A check valve 22 that allows only a flow from the water supply port side to the hot water mixing valve V4 is disposed in the vicinity of the hot water mixing valve V4 of the branch pipe L12.

  In addition, one end of the pipe L22 is connected to the water discharge port of the hot water mixing valve V4, and the other end of the pipe L22 is connected to the hot water supply port 9a of the connection adapter 9 provided in the bathtub 3. The pipe L22 includes, in order from the hot water filling valve V4 side, a hot water electromagnetic valve V6, a check valve 5 that allows only flow from the hot water filling valve V4 side to the bathtub 3, a water amount sensor 6, and hot water. A check valve 7 that allows only the flow from the tension mixing valve V4 side to the bathtub 3 is provided.

  As the hot water filling mixing valve V4, a pulse driving type mixing valve driven by a stepping motor (not shown) is used. The ratio of the flow rate at the first water inlet port (hot water storage tank 10 side) to the flow rate at the second water inlet port (water supply side) of the hot water filling mixing valve V4 is 0% to 100% (for example, driving) of the hot water filling mixing valve V4 It is controlled by adjusting the pulses 0-1500).

  Between the check valve 5 and the water amount sensor 6 of the pipe L22, one end of a drain pipe L42 provided with a drain valve V7 is connected. Further, one end of a drain pipe L41 provided with a relief valve 28 is connected to the vicinity of the hot water storage tank 10 of the pipe L21.

  The hot water solenoid valve V6, the check valve 5, the water amount sensor 6 and the check valve 7 constitute a composite water valve 30.

  The pipe L21, the check valve 21, the hot water mixing valve V4, the pipe L22, the composite water valve 30, the water supply pipe L11, the check valve 12, the pressure reducing valve V10, the branch pipe L12, and the check valve 22 are connected to the hot water storage tank 10. The bath hot water circuit between the bathtub 3 is comprised.

  The hot water solenoid valve V6 of the composite water valve 30 is an open / close valve that opens and closes a path through which hot water in the hot water storage tank 10 flows into the bathtub 3 via a bath circulation circuit described later.

<Bath circulation circuit>
One end of the pipe L <b> 24 is connected to the water inlet 9 b of the connection adapter 9, and the other end of the pipe L <b> 24 is connected to the secondary side input of the heat exchanger 20. A bath circulation pump P2 is disposed in the pipe L24. Further, one end of the branch pipe L23 is connected to the downstream side of the composite water valve 30 of the pipe L22, and the other end of the branch pipe L23 is connected to the output on the secondary side of the reheating heat exchanger 20.

  The bath circulation pump P2 circulates hot water in the bathtub 3 through the pipe L24, the reheating heat exchanger 20 (secondary side), the branch pipe L23, and a part of the pipe L22.

  The pipe L24, the reheating heat exchanger 20 (secondary side), the branch pipe L23, the pipe L22, and the bath circulation pump P2 constitute a bath circulation circuit.

<Bath chasing circuit>
Further, one end of the branch pipe L25 is connected upstream of the composite water valve 30 of the pipe L22, and the other end of the branch pipe L25 is connected to one end of the reheating heat exchanger 20 (primary side). One end of the pipe L26 is connected to the other end of the reheating heat exchanger 20 (primary side), and the other end of the pipe L26 is connected to the second water inlet port of the pump water inlet valve V1.

  The pipe L21, the hot water mixing valve V4, a part of the pipe L22, the branch pipe L25, the reheating heat exchanger 20 (primary side), the pipe L26, the pump inlet valve V1, the pipe L2, the bypass valve V2, the pipe L6, A part of the pipe L4, the boiling three-way valve V3, the pipe L7, and the boiling pump P1 constitute a bath reheating circuit.

<Bath cooling circuit>
Further, a part of the water supply pipe L11, a branch pipe L12, a check valve 22, a hot water mixing valve V4, a part of the pipe L22, a branch pipe L25, a reheating heat exchanger 20 (primary side), a pipe L26, A pump cooling valve V1, a pipe L2, a bypass valve V2, a pipe L6, a part of the pipe L4, a boiling three-way valve V3, a pipe L7, and a boiling pump P1 constitute a bath cooling circuit.

<Hot water supply circuit>
Further, one end of the pipe L31 is connected to the upper part of the hot water storage tank 10, and the other end of the pipe L31 is connected to the first water inlet port of the hot water supply mixing valve V5. A check valve 23 that allows only the flow from the hot water storage tank 10 side to the hot water supply mixing valve V5 is disposed in the pipe L31.

  Further, one end of the branch pipe L13 is connected to the vicinity of the check valve 22 of the branch pipe L12 and to the water supply port side, and the other end of the branch pipe L13 is connected to the second water inlet port of the hot water supply mixing valve V5. A check valve 24 that allows only a flow from the water supply port side to the hot water supply mixing valve V5 is disposed near the hot water supply mixing valve V5 of the branch pipe L13.

  One end of the pipe L32 is connected to the water outlet port of the hot water mixing valve V5, and the other end of the pipe L32 is connected to the hot water supply section 26 (a faucet in this embodiment). A water amount sensor 25 is provided in the pipe L32.

  The hot water supply mixing valve V5 is a pulse-driven mixing valve that is driven by a stepping motor (not shown). The ratio of the flow rate of the first water inlet port (hot water storage tank 10 side) to the flow rate of the second water inlet port (water supply side) of the hot water supply mixing valve V5 is the opening degree 0% to 100% (for example, drive pulse 0) of the hot water supply mixing valve V5. ˜1500) is controlled.

  The pipe L31, the check valve 23, the hot water mixing valve V5, the pipe L32, the water supply pipe L11, the check valve 12, the pressure reducing valve V10, a part of the branch pipe L12, the branch pipe L13 and the check valve 24 constitute a hot water supply circuit. doing.

<Temperature sensor group>
The hot water storage tank 10 is provided with six temperature sensors T1 to T6 at substantially equal intervals from the lower side to the upper side. In addition, a temperature sensor T11 for detecting the feed water temperature is provided on the upstream side in the vicinity of the connection point between the branch pipe L12 and the branch pipe L13. In addition, a temperature sensor T <b> 12 that detects a hot water supply temperature is provided downstream of the water amount sensor 25 in the pipe L <b> 32 connected to the hot water supply unit 26.

  In addition, the pipe L24 connected to the bathtub 3 includes a water level sensor LS, a water flow switch SW as an example of a water flow sensor, and a temperature sensor T13 between the connection adapter 9 on the bathtub 3 side and the bath circulation pump P2. They are provided in order from the connection adapter 9 side.

  Furthermore, a temperature sensor T14 that detects the temperature of hot water supplied to the bathtub 3 is provided at a connection point where the branch pipe L23 is connected to the pipe L22 connected to the bathtub 3.

  Further, an incoming water temperature sensor T21 for detecting the incoming water temperature of the incoming water to the heat exchanging portion 2a of the heat pump unit 2 is provided in the pipe L3.

  Further, a tapping temperature sensor T22 for detecting a tapping temperature of the return water from the heat exchanging portion 2a of the heat pump unit 2 is provided in the pipe L4.

The heat pump unit 2 includes an outside air temperature sensor T23 that detects the outside air temperature. In addition, the heat pump unit 2 uses carbon dioxide (CO ₂ ) as a refrigerant, and can control a tapping temperature in a range of 65 ° C. to 90 ° C., for example.

<Control device>
The hot water storage unit 1 includes a control device 100 including a microcomputer and an input / output circuit. The control device 100 performs transmission / reception with the remote controller 200. The control device 100 includes temperature sensors T1 to T6, T11 to T14, a water level sensor LS, a water flow switch SW, a water amount sensor 6, 25, an incoming water temperature sensor T21, a hot water temperature sensor T22, an outside air temperature sensor T23, and a remote controller 200. In response to the signal, the heat pump unit 2, the boiling pump P1, the bath circulation pump P2, the pump inlet valve V1, the bypass valve V2, the boiling three-way valve V3, the hot water mixing valve V4, the hot water mixing valve V5, and the hot water electromagnetic valve V6. Control etc.

  Moreover, the said control apparatus 100 has the mixing valve opening calculation part 100a, the hot water mixing valve opening correction | amendment part 100b, the hot water mixing valve control part 100c, the bath cooling control part 100d, and the boiling control part 100e.

  Based on the temperature of the hot water in the upper part of the hot water storage tank 10 and the temperature of the water supply (the temperature of the water supplied from the outside via the water supply pipe L11), the mixing valve opening calculation unit 100a calculates the hot water at the target hot water supply temperature TK. The target opening degree DK of the hot water supply mixing valve V5 for supply is calculated.

  The hot water mixing valve opening correction unit 100b performs hot water cooling by mixing a hot water in the upper part of the hot water storage tank 10 and water supplied from the outside with a hot water mixing valve V5 after performing a bath cooling operation described later. Then, the opening degree of the hot water supply mixing valve V5 is corrected so that the mixing ratio of water becomes higher than the target opening degree DK.

  The hot water mixing valve control unit 100c controls the hot water mixing valve V5 based on the target opening DK calculated by the mixing valve opening calculation unit 100a and the opening corrected by the hot water mixing valve opening correction unit 100b. Control.

  Further, the bath cooling control unit 100d controls a bath cooling circuit that cools and makes the hot water in the bath cool by circulating the water in the lower part of the hot water storage tank 10 through the heat exchanger 20. This bath cooling operation is performed in order to lower the bath temperature without adding water, since adding water to the bath water will make the bath water level rise or waste the added water.

  The boiling control unit 100e controls a boiling circuit that circulates hot water in the hot water storage tank 10 through the heat exchange unit 2a of the heat pump unit 2 to boil up.

[About boiling operation]
FIG. 2 shows the flow of hot water during the boiling operation of the hot water supply apparatus. In FIG. 2, the same components as those in FIG. 1 are denoted by the same reference numerals.

  In the hot water supply apparatus configured as described above, in the “boiling operation” in which hot water in the hot water storage tank 10 is boiled by the heat pump unit 2, the pump water inlet valve V1 is switched to a position where the pipe L1 and the pipe L2 are communicated as shown in FIG. The bypass valve V2 is switched to a position where the pipe L2 and the pipe L3 communicate with each other. Further, the boiling three-way valve V3 is switched to a position where the pipe L4 and the pipe L5 communicate with each other.

  Then, the boiling pump P1 is operated to supply hot water in the hot water storage tank 10 to the pipe L1, the pump water inlet valve V1, the pipe L2, the bypass valve V2, the pipe L3, the heat exchange unit 2a of the heat pump unit 2, and the pipe L4. , It is circulated through the boiling three-way valve V3 and the pipe L5 (or L7).

  The said control apparatus 100 controls the heat pump unit 2 so that the tapping temperature of the heat pump unit 2 becomes the target tapping temperature TS during the boiling operation. Here, the target hot water temperature TS is calculated by the control device 100 based on the amount of hot water supplied from the hot water storage tank 10 or the like. For example, when the amount of hot water used is large, the target hot water temperature TS is as high as 85 ° C., for example, and when the amount of hot water used is small, the target hot water temperature TS is as low as 65 ° C., for example.

[About hot water driving]
FIG. 3 shows the flow of hot water during the hot water filling operation of the hot water supply apparatus. In FIG. 3, the same components as those in FIG. 1 are denoted by the same reference numerals.

  In the above hot water supply apparatus, when performing the “hot water operation” for supplying hot water from the hot water storage tank 10 into the bath tub 3, as shown in FIG. 3, when the hot water solenoid valve V 6 is opened by the control device 100, The hot water in the upper part of is supplied into the bathtub 3 through the pipe L21, the hot water mixing valve V4 and the pipe L22. At this time, the control device 100 controls the hot water filling mixing valve V4 to mix hot hot water from the hot water storage tank 10 and external water supply based on the target set temperature. And when the water level in the bathtub 3 detected by the water level sensor LS reaches the set water level, the hot water solenoid valve V6 is closed.

  In “bath hot water operation”, when the user operates the remote controller 200 and the bath automatic operation mode for automatically maintaining the set water level and the set temperature is selected, the hot water storage tank 10 enters the bath tub 3. After performing a “hot water operation” for supplying hot water, a “bath monitoring operation” is performed in which the hot water surface level in the bathtub 3 is maintained at the set water level and the hot water temperature is maintained at the bath set temperature.

[About bathing operation]
FIG. 4 shows the flow of hot water during the reheating operation of the hot water supply apparatus. In FIG. 4, the same reference numerals are assigned to the same components as those in FIG.

  In the above hot water supply apparatus, when performing "bath reheating operation" in which hot water in the bath tub 3 is heated and repelled, as shown in FIG. 4, the pump water intake valve V1 is connected to the line L26 and the line L2. And the bypass valve V2 is switched to a position where the pipe L2 and the pipe L6 communicate with each other. Further, the boiling three-way valve V3 is switched to a position where the pipe L6 and the pipe L7 communicate with each other.

  Then, with the opening degree of the hot water filling valve V4 fully opened to the hot water side, the boiling pump P1 is operated, and the hot water in the hot water storage tank 10 is connected to the pipe L21, the hot water filling mixing valve V4. Circulate through part of the pipe L22, branch pipe L25, reheating heat exchanger 20 (primary side), pipe L26, pump water intake valve V1, pipe L2, pipe L6, part of pipe L4 and pipe L7 . At this time, by operating the bath circulation pump P2 to circulate hot water in the bathtub 3 through the pipe L24, the reheating heat exchanger 20 (secondary side), the branch pipe L23, and a part of the pipe L22, The reheating heat exchanger 20 heats the hot water on the bathtub 3 side to reheat.

[About bath cooling operation]
FIG. 5 shows the flow of hot water during the bath cooling operation of the hot water supply apparatus. In FIG. 5, the same components as those in FIG. 1 are denoted by the same reference numerals.

  In the above hot water supply apparatus, when performing “bath cooling operation” in which the hot water in the bath tub 3 is cooled and slimmed, as shown in FIG. 5, the pump water inlet valve V1 is placed at a position where the pipe L26 and the pipe L2 communicate with each other. The bypass valve V2 is switched to a position where the pipe L2 and the pipe L6 communicate with each other. Further, the boiling three-way valve V3 is switched to a position where the pipe L6 and the pipe L7 communicate with each other.

  Then, with the opening degree of the hot water filling valve V4 fully opened to the water side, the boiling pump P1 is operated to divert the water in the lower part of the hot water storage tank 10 to a part of the water supply pipe L11. Pipe L12, hot water mixing valve V4, part of pipe L22, branch pipe L25, reheating heat exchanger 20 (primary side), pipe L26, pump inlet valve V1, pipe L2, pipe L6, part of pipe L4 And circulate through the pipe L7. At this time, by operating the bath circulation pump P2 to circulate hot water in the bathtub 3 through the pipe L24, the reheating heat exchanger 20 (secondary side), the branch pipe L23, and a part of the pipe L22, The hot water on the bathtub 3 side is cooled by the reheating heat exchanger 20 to make it warm.

  In this “bath cooling operation”, the user operates the remote controller 200 to maintain the bath temperature by, for example, 2 ° C. and keep it for a predetermined time (10 minutes in this embodiment) without changing the bath set temperature. After that, the temperature of the hot water on the bathtub 3 side is returned to the bath set temperature.

[About hot water operation]
FIG. 6 shows the flow of hot water during the hot water supply operation of the hot water supply apparatus. In FIG. 6, the same components as those in FIG. 1 are denoted by the same reference numerals.

  In the above hot water supply apparatus, when performing a “hot water supply operation” in which hot water is supplied from the hot water supply unit 26, when the faucet of the hot water supply unit 26 is opened, water from the outside flows through the water supply pipe L11 as shown in FIG. Then, the hot water is supplied from the lower part of the hot water storage tank 10 into the hot water storage tank 10. Thereby, high temperature hot water is extruded from the upper part in the hot water storage tank 10 through the pipe L31.

  Then, hot water is supplied from the upper part of the hot water storage tank 10 to the first water inlet port of the hot water supply mixing valve V5 through the pipe L31, and water from the outside is part of the water supply pipe L11, the branch pipe L12, and It is supplied to the second water inlet port (water side) of the hot water supply mixing valve V5 through a part of the branch pipe L13.

  Here, hot hot water in the upper part of the hot water storage tank 10 and external water are mixed by the hot water supply mixing valve V5, and then hot water is discharged from the hot water supply section 26 through the pipe L32.

In the “hot water supply operation”, when the faucet of the hot water supply unit 26 is opened and the start of hot water supply is detected by the water amount sensor 25, the control device 100 performs an initial operation according to the target hot water supply temperature TK by the mixing valve opening degree calculation unit 100a. The mixing ratio [%] is calculated by the following formula.

  Here, the hot water temperature [° C.] in the hot water storage tank is obtained by adding a correction value to the current temperature of the hot water in the upper part of the hot water storage tank 10 detected by the temperature sensor T6. This is the temperature of the water flowing through the branch pipe L12 detected by the temperature sensor T11.

  The mixing valve opening calculation unit 100a calculates a target opening DK of the hot water mixing valve V5 according to the initial mixing ratio [%], and the hot water mixing valve control unit 100c performs hot water mixing based on the target opening DK. Control the valve V5.

  During the subsequent hot water supply operation, the hot water mixing valve control unit 100c controls the mixing ratio of hot water and water in the hot water mixing valve V5 so that the hot water temperature detected by the temperature sensor T12 becomes the target hot water temperature TK. I do.

  In FIG. 6, the pipe portion (part of the branch pipe L12) from the connection point A between the water supply pipe L11 and the branch pipe L12 to the connection point B between the branch pipe L12 and the branch pipe L13 is connected to the water side of the bath cooling circuit. A common piping portion S1 is used for the piping and the water-side piping of the hot water supply circuit. In this embodiment, the total of the internal volume of the common pipe portion S1 and the internal volume of the branch pipe L13 is 90 milliliters.

  FIG. 7 shows changes in the opening degree of the hot water supply mixing valve V5 and the hot water supply temperature during the bath cooling operation of the hot water supply apparatus. In FIG. 7, the horizontal axis represents time (arbitrary scale), and the vertical axis represents the hot water supply temperature (arbitrary scale) and the opening degree of the hot water supply mixing valve V5 (arbitrary scale). In FIG. 7, when the opening degree of the hot water supply mixing valve V5 increases upward, the ratio of the flow rate on the hot water side (hot water storage tank 10 side) to the flow rate on the water supply side increases, while the opening degree of the hot water supply mixing valve V5 decreases on the lower side. When it becomes smaller, the ratio of the flow rate on the hot water side (hot water storage tank 10 side) to the flow rate on the water supply side becomes smaller.

  As shown in FIG. 7, when the hot water supply operation by the hot water supply circuit is stopped and the bath cooling operation by the bath cooling circuit is started, the water in the lower part of the hot water storage tank 10 is reheated and the heat exchanger 20 (1 Circulate via the secondary side).

  At the same time as the start of the bath cooling operation, even when hot water supply is stopped, the opening degree of the hot water mixing valve V5 is calculated by the mixing valve opening degree calculation unit 100a by the hot water mixing valve opening degree correction unit 100b. The correction value Ds is corrected so that the mixing ratio of water is higher than that of DK.

  The bath cooling operation ends after the hot water supply mixing valve V5 is held for a predetermined time (10 minutes in this embodiment) in a state in which the opening ratio of the hot water mixing valve V5 is corrected so that the mixing ratio of water is higher than the target opening degree DK.

  By the end of the bath cooling operation, water in the lower part of the hot water storage tank 10, that is, water that is warmer than several degrees C. to several tens of degrees C. than the water supply temperature remains in the common pipe portion S1 shown in FIG.

  Next, when the hot water supply operation by the hot water supply circuit is started, an opening-return integrated flow rate (for example, 0. 3 liters) or more, and when the hot water supply by the hot water supply circuit continues for a preset opening return time (for example, 1.5 sec), the hot water mixing valve control unit 100c controls the opening of the hot water mixing valve V5. In addition, the hot water side is returned to the return opening (in this embodiment, +60 pulses hot water from the target opening DK) with respect to the target opening DK calculated by the mixing valve opening calculation unit 100a.

  Next, in the section t2 of FIG. 7, the integrated flow rate of hot water supply by the hot water supply circuit is equal to or greater than a preset feedback control start integrated flow rate (for example, 0.2 liters) from the time when the opening degree of the hot water mixing valve V5 is set to the return opening degree. When hot water supply by the hot water supply circuit continues for a preset feedback control start time (for example, 1.0 sec), the hot water supply valve control unit 100c causes the hot water supply temperature of the hot water supply circuit to become the target hot water supply temperature TK. Thus, the opening degree of the hot water supply mixing valve V5 is feedback-controlled.

  In FIG. 7, a change in hot water temperature when the opening degree of the hot water mixing valve V5 is “without correction control” is indicated by a dotted line, and a large overshoot occurs at the start of hot water supply. On the other hand, in the hot water supply apparatus of the first embodiment, the hot water supply temperature in “with correction control” for correcting the opening degree of the hot water supply mixing valve V5 so that the mixing ratio of water becomes higher than the target opening degree DK (FIG. No. 7 (shown by a solid line) reduces the overshoot at the start of hot water supply and quickly reaches the target hot water temperature.

  Next, the conditions under which the bath cooling operation of the water heater can be performed will be described with reference to FIG. In FIG. 8, the horizontal axis represents the water supply temperature [° C.], and the vertical axis represents the temperature [° C.] of the lower water in the hot water storage tank 10. In FIG. 8, the area surrounded by the thick solid line is the operation area of the hot water supply apparatus. That is, the allowable range of the water supply temperature [° C.] in this hot water supply apparatus is 5 ° C. to 29 ° C., and the allowable range of the temperature [° C.] of the lower water in the hot water storage tank 10 is 5 when the water supply temperature is 5 ° C. When the feed water temperature is 29 ° C., it is 30 ° C. to 80 ° C.

  Here, the bath cooling prohibition temperature is set to 35 ° C. or more as a first condition in which the temperature difference between the temperature of the lower water in the hot water storage tank 10 and the hot water temperature of the bath is small and cooling cannot be sufficiently performed.

  Moreover, since the temperature difference between the temperature of the lower water in the hot water storage tank 10 and the water supply temperature (the temperature of the water supplied from the outside) is large, the second condition for the hot water supply temperature to overshoot at the start of hot water supply is bath cooling. The forbidden temperature difference is 15 ° C or more.

  Therefore, the region in which the bath cooling operation by the bath cooling circuit is possible is a hatched region shown in FIG.

  According to the hot water supply apparatus having the above configuration, when it is determined that water having a temperature higher than the normal temperature (water supply temperature) is left in the common pipe portion S1 by the operation using the bath cooling circuit, the hot water supply mixing valve V5 of the hot water supply circuit is used. When the hot water in the upper part of the hot water storage tank 10 and the water supplied from the outside are mixed to supply hot water, the hot water mixing valve opening correction unit 100b sets the opening degree of the hot water mixing valve V5 to be higher than the target opening degree DK. The mixture ratio is corrected so as to increase.

  Here, the target opening degree DK of the hot water supply mixing valve V5 is determined based on the temperature of the hot water in the hot water storage tank 10 detected by the temperature sensor T6 by the mixing valve opening degree calculation unit 100a and the temperature sensor T11 during past water supply. It is calculated based on the water supply temperature (temperature of water supplied from the outside) detected by.

  Then, on the basis of the opening corrected by the hot water mixing valve opening correction unit 100b, the hot water mixing valve control unit 100c controls the hot water mixing valve V5 to set the opening of the hot water mixing valve V5 to the target opening. It correct | amends so that the mixing ratio of water may become higher than DK. When the opening degree of the hot water supply mixing valve V5 is corrected so that the mixing ratio of water is higher than the target opening degree DK, the water remaining in the common pipe portion S1 is used for hot water supply without being mixed. Based on the target opening degree DK calculated by the valve opening degree calculation unit 100a, a normal hot water supply operation is performed in which the hot water supply mixing valve control unit 100c controls the hot water supply mixing valve V5.

  In this way, by appropriately controlling the opening degree of the hot water supply mixing valve V5 with respect to the hot water supply operation after the bath cooling operation using the bath cooling circuit (the operation for cooling the bath water to make it warm). The hot water remaining in the common pipe portion S1 at the start of hot water supply can be prevented from being mixed by the hot water supply mixing valve V5 and hot water having a temperature higher than the target hot water supply temperature TK can be prevented from coming out of the faucet of the hot water supply section 26.

  In addition, the hot water mixing valve opening correction unit 100b sets the opening of the hot water mixing valve V5 so that the mixing ratio of water is higher than the target opening DK (in this embodiment, 100). Since the amount of correction is equal to the pulse), the opening control of the hot water supply mixing valve V5 can be simplified.

  The hot water mixing valve opening correction unit 100b includes the temperature of the hot water in the upper part of the hot water storage tank 10 detected by the temperature sensor T6 and the water side of the hot water mixing valve V5 stored when hot water was supplied in the past. The correction value Ds for correcting the opening degree of the hot water supply mixing valve V5 so that the mixing ratio of water becomes higher than the target opening degree DK may be determined based on the water supply temperature. In this case, it is possible to reduce the hot water supply temperature overshoot at the start of hot water supply by the hot water supply circuit and bring the hot water supply temperature closer to the target hot water supply temperature TK.

  In addition, the hot water mixing valve opening correction unit 100b includes the temperature of the upper hot water in the hot water storage tank 10 detected by the temperature sensor T6 and the temperature of the lower water in the hot water storage tank 10 detected by the temperature sensor T1. The correction value Ds for correcting the opening degree of the hot water supply mixing valve V5 so that the mixing ratio of water is higher than the target opening degree DK may be determined.

  In addition, the hot water supply mixing valve control unit 100c starts the hot water supply circuit from the time when hot water supply by the hot water supply circuit is started in a state where the opening degree of the hot water supply mixing valve V5 is corrected so that the mixing ratio of water becomes higher. When the accumulated flow rate of hot water reaches or exceeds a preset opening return integrated flow rate (for example, 0.3 liters), hot water supply by the hot water supply circuit continues for a preset opening time recovery time (for example, 1.5 sec). When this is done, the opening time of the hot-water supply mixing valve V5 is set to a holding time (for example, 1 .. 0 sec). Accordingly, the hot water supply temperature can be controlled so as to quickly reach the target hot water supply temperature TK while preventing the hot water supply temperature at the start of hot water supply by the hot water supply circuit from becoming higher than the target hot water supply temperature.

  Note that the hot water supply mixing valve control unit 100c starts the hot water supply by the hot water supply circuit in a state where the opening degree of the hot water supply mixing valve V5 is corrected so that the mixing ratio of water is higher than the target opening degree DK. When the accumulated flow rate of hot water supply by the hot water supply circuit becomes equal to or greater than the opening return integrated flow rate (for example, 0.3 liter), the opening time of the hot water mixing valve V5 is maintained at the return opening on the hot water side from the target opening DK. You may make it hold | maintain (for example, 1.0 sec).

  Alternatively, the hot water mixing valve control unit 100c is configured to start hot water supply by the hot water supply circuit in a state where the opening degree of the hot water mixing valve V5 is corrected so that the mixing ratio of water is higher than the target opening degree DK. When hot water supply by the hot water supply circuit continues for an opening return time (for example, 1.5 sec), the opening of the hot water mixing valve V5 is set to the return opening on the hot water side from the target opening DK and the holding time (for example, 1.0 sec). You may make it hold | maintain.

  When the hot water mixing valve control unit 100c returns the target opening degree DK to the target opening degree DK from the state in which the opening degree of the hot water mixing valve V5 is corrected so that the mixing ratio of water is higher than the target opening degree DK, first, The opening degree of the valve V5 is set to a return opening degree on the hot water side from the target opening degree DK (+60 pulse hot water side from the target opening degree DK). Then, from the time when the hot water supply mixing valve V5 is set to the return opening degree, when the integrated flow rate of hot water supply by the hot water supply circuit becomes equal to or higher than a preset feedback control start integrated flow rate (for example, 0.2 liter), and by the hot water supply circuit When hot water supply continues for a preset feedback control start time (for example, 1.0 sec), the opening degree of the hot water supply mixing valve V5 is feedback controlled so that the hot water supply temperature of the hot water supply circuit becomes the target hot water supply temperature TK. As a result, the hot water supply temperature at the start of hot water supply by the hot water supply circuit is quickly made equal to the target hot water supply temperature TK, and then hot water supply at a stable hot water supply temperature can be performed by feedback control.

  Here, the integrated flow rate of hot water supply by the hot water supply circuit is obtained by multiplying the flow rate [liter / sec] per unit time detected by the water amount sensor 25 by the hot water supply time [sec].

  The feedback control start integrated flow rate is set assuming that the opening degree of the hot water supply mixing valve V5 is 50%, but the feedback control start integrated flow rate is set based on the current opening degree of the hot water supply mixing valve V5. Also good. For example, if the current opening degree of the hot water supply mixing valve V5 is on the water side with respect to 50% of the opening degree of the hot water supply mixing valve V5, the feedback control start integrated flow rate is smaller than when the opening degree is set to 50%. On the other hand, if the current opening degree of the hot water supply mixing valve V5 is on the hot water side with respect to 50%, the feedback control start integrated flow rate is made larger than when the opening degree is set to 50%.

  When the opening degree of the hot water mixing valve V5 is corrected so that the mixing ratio of water is higher than the target opening degree DK, the hot water mixing valve control unit 100c returns to the target opening degree DK. Is set to a return opening on the hot water side with respect to the target opening DK (+60 pulse hot water side from the target opening DK), and then the feedback control start integrated flow ( For example, the opening degree of the hot water supply mixing valve V5 may be feedback-controlled so that the hot water supply temperature of the hot water supply circuit becomes the target hot water supply temperature TK. In this case, after the hot water supply temperature at the start of hot water supply by the hot water supply circuit is quickly set to the target hot water supply temperature TK, the hot water at a stable hot water supply temperature can be provided by feedback control.

  Alternatively, when the hot water mixing valve control unit 100c returns the target opening degree DK to the target opening degree DK from the state where the opening degree of the hot water mixing valve V5 is corrected so that the mixing ratio of water is higher than the target opening degree DK, the hot water mixing valve V5 is used. Is set to a return opening on the hot water side with respect to the target opening DK (+60 pulse hot water side from the target opening DK), and then a feedback control start time (for example, 1.0 sec) in which hot water supply by the hot water supply circuit is set in advance. ) When the operation is continued, the opening degree of the hot water supply mixing valve V5 may be feedback controlled so that the hot water supply temperature of the hot water supply circuit becomes the target hot water supply temperature TK.

  Further, in the state where the hot water of the bath is circulated through the heat exchanger 20 by the bath circulation circuit, the lower water in the hot water storage tank 10 is circulated through the heat exchanger 20 by the bath cooling circuit. When the bath cooling operation is performed in which the hot water in the bath is cooled to make it warm, water having a temperature higher than the water supply temperature remains in the common pipe portion S1 after the bath cooling operation. In this state, by correcting the opening degree of the hot water supply mixing valve V5 so that the mixing ratio of water is higher than the target opening degree DK, hot water having a temperature higher than the target hot water supply temperature TK is discharged at the start of hot water supply. Can be prevented.

  In addition, when the hot water mixing valve control unit 100c starts cooling the hot water in the bath by the bath cooling circuit, the opening degree of the hot water mixing valve V5 is corrected so that the mixing ratio of water becomes higher than the target opening degree DK. Therefore, even when hot water is supplied by the hot water supply circuit during the bath cooling operation, it is possible to prevent hot water having a temperature higher than the target hot water temperature TK at the start of hot water supply. In this case, if hot water is supplied by the hot water supply circuit during the bath cooling operation, the bath cooling operation is immediately stopped.

  The bath cooling control unit 100d is configured such that when the temperature of the water in the lower part of the hot water storage tank 10 is equal to or higher than the bath cooling prohibition temperature (for example, 35 ° C.), When the temperature difference is equal to or greater than the bath cooling prohibition temperature difference (for example, 15 ° C.), bath water is not cooled by the bath cooling circuit. As a result, the temperature difference between the water in the lower part of the hot water storage tank 10 and the lower limit of the bath set temperature is small, so that the bath cooling operation that cannot be sufficiently cooled can be prohibited, and the temperature of the lower part of the hot water tank 10 When the temperature difference with the temperature of the water supplied from is large, it is possible to prevent the hot water temperature from overshooting at the start of hot water supply after the bath cooling operation.

  When the temperature of the lower water in the hot water storage tank 10 is not lower than the bath cooling prohibition temperature (for example, 35 ° C.), the bath cooling control unit 100d may not cool the hot water in the bath by the bath cooling circuit. Good. In this case, since the temperature difference between the water in the lower part of the hot water storage tank 10 and the hot water temperature of the bath is small, bath cooling operation in which cooling cannot be sufficiently performed can be prohibited.

  In addition, during the hot water supply by the hot water supply circuit, the bath cooling control unit 100d does not cool the hot water of the bath by the bath cooling circuit, so that the water side piping of the bath cooling circuit and the water side of the hot water supply circuit The present invention can be applied to a hot water supply apparatus having a circuit configuration in which the bath cooling circuit and the hot water supply circuit cannot be used at the same time for the common pipe portion S1 with the pipe.

  In the first embodiment, the pipe portion from the connection point A between the water supply pipe L11 and the branch pipe L12 to the connection point B between the branch pipe L12 and the branch pipe L13 is the water side pipe of the bath cooling circuit and the water of the hot water supply circuit. Although the common piping portion S1 with the side piping is used, the present invention may be applied to a hot water supply apparatus appropriately provided with a common piping portion according to the configuration of the bath cooling circuit or the configuration of the hot water supply circuit.

[Second Embodiment]
The hot water supply device of the second embodiment of the present invention has the same configuration as the hot water supply device of the first embodiment except for the operation of the control device 100, and FIG.

  The hot water supply device of the second embodiment has the same effects as the hot water supply device of the first embodiment.

  In addition, the hot water mixing valve control unit 100c of the hot water supply apparatus according to the second embodiment corrects the opening degree of the hot water mixing valve V5 so that the mixing ratio of water is higher than the target opening degree DK. By pipe L31, check valve 23, hot water supply mixing valve V5, pipe L32, water quantity sensor 25, water supply pipe L11, check valve 12, pressure reducing valve V10, part of branch pipe L12, branch pipe L13 and check valve 24) When the target opening return hot water supply time (for example, 5.0 sec) has continued since the start of hot water supply, and the integrated flow rate of hot water supply by the hot water supply circuit is greater than or equal to a preset target opening return integrated flow rate (eg, 1 liter) When this happens, the water left in the common pipe portion S1 does not remain and is used for hot water supply. Thereby, in a state where the opening degree of the hot water supply mixing valve V5 is corrected so that the mixing ratio of water becomes higher than the target opening degree DK, hot water having a temperature lower than the target hot water supply temperature TK does not come out at the start of the next hot water supply. It is possible to return to the hot water mixing valve opening degree control in which the hot water temperature is set to the target hot water temperature.

  In addition, the hot water mixing valve control unit 100c previously sets the integrated flow rate of hot water supply by the hot water supply circuit in a state where the opening degree of the hot water mixing valve V5 is corrected so that the mixing ratio of water is higher than the target opening degree DK. When the target opening degree return integrated flow (for example, 1 liter) or more is reached, the hot water mixing valve opening degree control may be returned to the hot water supply temperature TK. Thereby, in a state where the opening degree of the hot water supply mixing valve V5 is corrected so that the mixing ratio of water becomes higher than the target opening degree DK, hot water having a temperature lower than the target hot water supply temperature TK does not come out at the start of the next hot water supply. It is possible to return to the hot water mixing valve opening degree control in which the hot water temperature is set to the target hot water temperature.

  The target opening degree return integrated flow rate is set with the opening degree of the hot water supply mixing valve V5 set to 50%, but the target opening degree return integrated flow rate is set based on the current opening degree of the hot water supply mixing valve V5. Also good.

  Alternatively, the hot water supply mixing valve control unit 100c corrects the opening degree of the hot water supply mixing valve V5 so that the mixing ratio of water is higher than the target opening degree DK, and then starts the hot water supply by the hot water supply circuit. At the time of opening degree return hot water supply time (for example, 5.0 sec), the hot water mixing valve opening degree control may be performed so that the hot water supply temperature becomes the target hot water supply temperature TK.

  The hot water supply mixing valve control unit 100c corrects the opening degree of the hot water supply mixing valve V5 so that the mixing ratio of water is higher than the target opening degree DK, and the bath hot water filling circuit (pipe L21, check valve). 21. Preset target opening degree of hot water supply by hot water supply mixing valve V4, pipe L22, composite water valve 30, water supply pipe L11, check valve 12, pressure reducing valve V10, branch pipe L12 and check valve 22) When the return hot water filling time (for example, 5.0 sec) is continued and the accumulated flow rate of hot water supply by the bath hot water filling circuit exceeds the preset target opening return hot water filling integrated flow rate (1 liter), The water left in the common pipe portion S1 is not left and used for bathing. Thereby, in a state where the opening degree of the hot water supply mixing valve V5 is corrected so that the mixing ratio of water becomes higher than the target opening degree DK, hot water having a temperature lower than the target hot water supply temperature TK does not come out at the start of the next hot water supply. It is possible to return to the hot water mixing valve opening degree control in which the hot water temperature is set to the target hot water temperature.

  In addition, the hot water supply valve control unit 100c sets hot water supply by the bath hot water supply circuit in a state where the opening degree of the hot water supply mixing valve V5 is corrected so that the mixing ratio of water is higher than the target opening degree DK. When the target opening degree return hot water filling time (for example, 5.0 sec) is continued, the hot water mixing valve opening degree control may be performed so that the hot water supply temperature becomes the target hot water temperature.

  Alternatively, the hot water supply mixing valve control unit 100c corrects the opening of the hot water supply mixing valve V5 so that the mixing ratio of water is higher than the target opening DK, and the accumulated flow of hot water supply by the bath hot water supply circuit May be returned to the hot water mixing valve opening control to set the hot water supply temperature to the target hot water temperature when the preset opening of the target opening return hot water filling integrated flow rate (1 liter) or more is reached.

  Further, the hot water supply mixing valve control unit 100c corrects the opening degree of the hot water supply mixing valve V5 so that the mixing ratio of water is higher than the target opening degree DK. 60 minutes), the opening degree of the hot water supply mixing valve V5 is returned so that the hot water supply temperature of the hot water supply circuit becomes the target hot water supply temperature TK. At this time, hot water mixing is performed by setting a target opening return time so that the water left in the common pipe portion S1 becomes the same as the water supply temperature (temperature of water supplied from the outside) by natural heat dissipation. In the state where the opening degree of the valve V5 is corrected so that the mixing ratio of water is higher than the target opening degree DK, the hot water mixing valve V5 is set so that hot water having a temperature lower than the target hot water supply temperature TK does not come out at the start of the next hot water supply. The opening can be returned to the target opening DK.

[Third Embodiment]
FIG. 9 shows a piping system diagram of a hot water supply apparatus according to the third embodiment of the present invention. The hot water supply apparatus of the third embodiment has the same configuration as the hot water supply apparatus of the first embodiment shown in FIG. 1 except for the connection of the pipe L5, and the same reference numerals are assigned to the same components. .

  As shown in FIG. 9, the hot water supply apparatus of the third embodiment has one end of the pipe L5 connected to the first outlet port of the boiling three-way valve V3 and the other end of the pipe L5 connected to the pipe L31 of the hot water supply circuit. ing.

  During the heating operation of the hot water supply apparatus, as shown in FIG. 10, the pump water inlet valve V1 is switched to a position where the pipe L1 and the pipe L2 are communicated, and the bypass valve V2 is switched to a position where the pipe L2 and the pipe L3 are communicated. Further, the boiling three-way valve V3 is switched to a position where the pipe L4 and the pipe L5 communicate with each other.

  Then, the boiling pump P1 is operated to supply hot water in the hot water storage tank 10 to the pipe L1, the pump water inlet valve V1, the pipe L2, the bypass valve V2, the pipe L3, the heat exchange unit 2a of the heat pump unit 2, and the pipe L4. , Circulating through a part of the boiling three-way valve V3, the pipe L5 and the pipe L31.

  As described above, in the hot water supply apparatus of the third embodiment, hot hot water from the heat pump unit 2 flows into the upper portion of the hot water storage tank 10 through the pipe L5 and a part of the pipe L31.

  And when boiling operation is complete | finished, in the piping L31, it will be in the state by which the hot tap water remains in the piping part between the connection point C of the piping L5 and the piping L31 to the upper part of the hot water storage tank 10. FIG. . This piping portion is composed of a piping and a hot water supply circuit (piping L31, check valve 23, check valve 23, Piping common to the hot water side piping of the hot water supply mixing valve V5, piping L32, water amount sensor 25, water supply piping L11, check valve 12, pressure reducing valve V10, part of the branch piping L12, branch piping L13 and check valve 24) Part S2.

  On the other hand, the flow of hot water during the hot water supply operation of the hot water supply device is the same as that of the hot water supply device of the first embodiment, as shown in FIG. That is, in the hot water supply device, when the faucet of the hot water supply unit 26 is opened, water from the outside is supplied into the hot water storage tank 10 from the lower part of the hot water storage tank 10 through the water supply pipe L11 by the water supply pressure. Hot water is pushed out from the upper part through the pipe L31. Then, hot water is supplied from the upper part of the hot water storage tank 10 to the first water inlet port of the hot water supply mixing valve V5 through the pipe L31, and water from the outside is part of the water supply pipe L11, the branch pipe L12, and It is supplied to the second water inlet port (water side) of the hot water supply mixing valve V5 through a part of the branch pipe L13.

  According to the hot water supply apparatus having the above configuration, hot water having a temperature higher than the normal temperature (the temperature of the hot water in the hot water storage tank 10) is left in the common pipe portion S2 by the operation using the boiling circuit. When the hot water mixing valve V5 of the hot water supply circuit mixes hot water in the upper part of the hot water storage tank 10 with water supplied from outside, the hot water mixing valve opening correction unit 100b opens the opening of the hot water mixing valve V5. Is corrected so that the mixing ratio of water is higher than the target opening degree DK. Based on the opening corrected by the hot water mixing valve opening correcting unit 100b, the hot water mixing valve control unit 100c controls the hot water mixing valve V5. At this time, if all the hot water left in the common pipe portion S2 is used for hot water supply, the hot water supply mixing valve control unit 100c supplies hot water based on the target opening degree DK calculated by the mixing valve opening calculation unit 100a. A normal hot water supply operation for controlling the mixing valve V5 may be performed.

  In this way, the hot water remaining in the common pipe portion S2 at the start of hot water supply is controlled by appropriately controlling the opening of the hot water supply mixing valve V5 with respect to the hot water supply operation after the boiling operation using the boiling circuit. Are mixed by the hot water supply mixing valve V5 and hot water having a temperature higher than the target hot water supply temperature TK can be prevented from coming out of the faucet of the hot water supply section 26.

  Further, the temperature of the hot water in the hot water storage tank 10 is lower than the hot water temperature of the heat pump unit 2 detected by the temperature sensor T22 during the boiling operation by the boiling circuit, and the hot water temperature and the hot water tank 10 When the temperature difference with the temperature of the hot water at the upper part of the water is equal to or higher than a preset judgment temperature, the opening of the hot water supply mixing valve V5 is corrected so that the mixing ratio of water is higher than the target opening DK. Hot water having a temperature higher than the temperature of the hot water in the hot water storage tank 10 detected by the temperature sensor T6 during operation is left in the common pipe portion S2, and the hot water left in the common pipe portion S2 is left. However, even if it is mixed with water by the hot water supply mixing valve V5, hot water higher than the target hot water supply temperature TK can be prevented. On the other hand, if the temperature of the hot water in the hot water storage tank 10 is lower than the hot water temperature of the heat pump unit 2, but the temperature difference between the hot water temperature and the temperature of the hot water in the hot water storage tank 10 is less than the judgment temperature, By not correcting the opening of the mixing valve V5, it is possible to prevent the hot water supply temperature from becoming unstable at the start of hot water supply.

  The other end of the pipe L26, one end of which is connected to the other end of the reheating heat exchanger 20 (primary side) of the reheating circuit, is connected to the upper portion of the hot water storage tank 10, and hot water is stored through this reheating circuit. In the hot water supply apparatus having a recirculation circulation pump that circulates the hot water in the upper part of the tank 10 and returns it back to the upper part of the hot water storage tank 10, the reheating operation by the reheating circuit and the boiling operation by the reheating circuit are simultaneously performed. When performed, the opening degree of the hot water supply mixing valve V5 is corrected so that the mixing ratio of water becomes higher than the target opening degree DK. Thereby, the temperature of the hot water in the upper part of the hot water storage tank 10 is lowered by the reheating operation during the boiling operation, and the hot water temperature of the heat pump unit 2 connected to the boiling circuit and the hot water of the upper part in the hot water storage tank 10 are reduced. When the temperature difference from the temperature becomes large, hot water having a temperature higher than the target hot water supply temperature TK can be prevented.

  In the said 3rd Embodiment, the piping part of the piping L31 between the connection point C of the piping L5 and the piping L31 to the upper part of the hot water storage tank 10 is common to the hot water side piping of a boiling circuit, and the hot water side piping of a hot water supply circuit. However, the present invention may be applied to a hot water supply apparatus in which a common pipe portion is appropriately provided according to the configuration of the boiling circuit and the hot water supply circuit.

  Although specific embodiments of the present invention have been described, the present invention is not limited to the first to third embodiments, and various modifications can be made within the scope of the present invention. For example, what combined suitably the content described in the said 1st-3rd embodiment is good also as one Embodiment of this invention.

DESCRIPTION OF SYMBOLS 1 ... Hot water storage unit 2 ... Heat pump unit 2a ... Heat exchange part 3 ... Bathtub 5, 7, 12, 21, 22, 23, 24 ... Check valve 6,25 ... Water quantity sensor 9 ... Connection adapter 9a ... Hot water supply port 9b ... Water absorption Mouth 10 ... Hot water storage tank 11 ... Strainer 20 ... Reheating heat exchanger 26 ... Hot water supply unit 27 ... Two-way valve for drainage 28 ... Relief valve 30 ... Compound water valve 100 ... Control device 100a ... Mixing valve opening calculation unit 100b ... Hot water supply Mixing valve opening correction unit 100c ... Hot water supply mixing valve control unit 100d ... Bath cooling control unit 100e ... Boiling control unit 200 ... Remote controller LS ... Water level sensor P1 ... Boiling pump P2 ... Bath circulation pump SW ... Water flow switches L1-L7 , L21, L22, L24, L26, L31, L32 ... piping L11 ... water supply piping L12, L13, L23, L25 ... branch piping L41, L42 ... drainage distribution T1 to T6, T11 to T14, ... temperature sensor T21 ... incoming water temperature sensor T22 ... hot water temperature sensor T23 ... outside air temperature sensor V1 ... pump water inlet valve V2 ... bypass valve V3 ... boiling three-way valve V4 ... hot water filling mixing valve V5 ... Mixing valve V6 ... Hot water solenoid valve V10 ... Pressure reducing valve

Claims (21)

It has at least one of the common pipe part of the water side pipe of the bath circuit and the water side pipe of the hot water supply circuit related to the hot water of the bath or the common pipe part of the pipe of the boiling circuit and the hot water side pipe of the hot water supply circuit A water heater,
Based on the temperature of the hot water in the upper part of the hot water storage tank and the temperature of the water supplied from the outside, the mixing valve opening for calculating the target opening of the hot water mixing valve for supplying hot water of the target hot water temperature from the hot water supply circuit A calculation unit;
If it is determined that water having a temperature higher than the normal temperature is left in the common pipe portion, the hot water in the upper part of the hot water storage tank and the water supplied from the outside are mixed by the hot water supply mixing valve of the hot water supply circuit. Hot water mixing valve opening correction unit for correcting the opening degree of the hot water mixing valve so that the mixing ratio of water is higher than the target opening degree,
A hot water mixing valve control unit that controls the hot water mixing valve based on the target opening calculated by the mixing valve opening calculation unit and the opening corrected by the hot water mixing valve opening correction unit Hot water supply device characterized by The hot water supply apparatus according to claim 1,
When the hot water mixing valve opening correction unit determines that water having a temperature higher than the normal temperature remains in the common pipe portion, the hot water mixing valve opening correction unit sets the opening of the hot water mixing valve to the target even when hot water is stopped. A hot water supply apparatus that performs correction by a preset correction value so that the mixing ratio of water is higher than the opening. The hot water supply apparatus according to claim 1 or 2,
The hot water mixing valve opening correction unit is based on the temperature of the upper hot water in the hot water storage tank and the temperature of the water on the water side of the hot water mixing valve or the temperature of the lower water in the hot water storage tank. The hot water supply apparatus is characterized in that a correction value for calculating a water mixing ratio higher than the target opening is calculated for the opening of the hot water mixing valve. The hot water supply apparatus according to claim 3,
The temperature of the water on the water side of the hot water mixing valve is determined based on the temperature of the water supplied from the outside on the water side of the hot water mixing valve stored when the hot water is supplied in the past. Hot water supply device. In the hot water supply device according to any one of claims 1 to 4,
The hot water mixing valve control unit is configured so that the hot water supply circuit starts from the time when hot water supply by the hot water supply circuit is started in a state where the opening degree of the hot water mixing valve is corrected so that the mixing ratio of water is higher than the target opening degree. When the hot water supply satisfies either one of the conditions that the preset opening time of the hot water supply continues or the condition that the integrated flow rate of the hot water supply by the hot water supply circuit is equal to or higher than the preset opening return integrated flow rate, A hot water supply apparatus, wherein the opening of the mixing valve is held for a preset holding time at a return opening on the hot water side with respect to the target opening. In the hot water supply device according to any one of claims 1 to 4,
The hot water mixing valve control unit is configured so that the hot water supply circuit starts from the time when hot water supply by the hot water supply circuit is started in a state where the opening degree of the hot water mixing valve is corrected so that the mixing ratio of water is higher than the target opening degree. When the condition that the hot water supply continues for a preset opening degree return time and the condition that the accumulated flow rate of hot water supply by the hot water supply circuit is equal to or greater than the opening degree return integrated flow rate, the opening degree of the hot water mixing valve is set to the target value. A hot water supply apparatus that holds a holding time at a return opening degree that is closer to the hot water than the opening degree. In the hot water supply device according to claim 5 or 6 ,
The hot water mixing valve control unit is configured so that the hot water temperature of the hot water supply circuit becomes the target hot water temperature from a state where the opening degree of the hot water mixing valve is corrected so that the mixing ratio of water is higher than the target opening degree. When returning the opening degree of the hot water supply mixing valve, the feedback control start time from which the hot water supply by the hot water supply circuit is set in advance is continued from the time when the opening degree of the hot water supply mixing valve is set to a return opening side of the hot water side from the target opening degree. When satisfying either of the conditions for the hot water supply or the condition that the accumulated flow rate of the hot water supply by the hot water supply circuit is equal to or greater than the preset feedback control start accumulated flow rate, the hot water supply temperature of the hot water supply circuit becomes the target hot water supply temperature. And a feedback control of the opening degree of the hot water mixing valve. In the hot water supply device according to claim 5 or 6 ,
The hot water mixing valve control unit says that the hot water supply by the hot water supply circuit continues for a preset feedback control start time from the time when the opening degree of the hot water mixing valve is set to a return opening side of the hot water side with respect to the target opening degree. When the condition and the condition that the accumulated flow rate of hot water supplied by the hot water supply circuit is equal to or greater than the feedback control start accumulated flow rate, the opening degree of the hot water mixing valve is fed back so that the hot water temperature of the hot water circuit becomes the target hot water temperature. A hot water supply device that is controlled. In the hot water supply device according to any one of claims 1 to 4 ,
The hot water mixing valve control unit corrects the opening degree of the hot water mixing valve so that the mixing ratio of water is higher than the target opening degree, and hot water supply by the hot water supply circuit is set to a target opening return hot water set in advance. The hot water supply temperature of the hot water supply circuit is the target hot water supply when either one of the conditions that the time continues or the integrated flow rate of hot water supplied by the hot water supply circuit is equal to or greater than a preset target opening return integrated flow rate is satisfied. A hot water supply apparatus, wherein the opening degree of the hot water supply mixing valve is returned to a temperature. In the hot water supply device according to any one of claims 1 to 4 or claim 9 ,
The hot water mixing valve control unit corrects the opening degree of the hot water mixing valve so that the mixing ratio of water is higher than the target opening degree, and hot water supply by the hot water supply circuit is set to a target opening return hot water set in advance. When the condition that the time is continued and the condition that the integrated flow rate of hot water supply by the hot water supply circuit is equal to or greater than a preset target opening return integrated flow rate is satisfied, the hot water supply temperature of the hot water supply circuit becomes the target hot water supply temperature. The hot water supply apparatus is characterized in that the opening degree of the hot water supply mixing valve is returned. In the hot water supply device according to any one of claims 1 to 4, or claim 9 or claim 10 ,
The bath circuit has a bath filling circuit that mixes hot water in the upper part of the hot water storage tank and water supplied from the outside to supply hot water to the bath,
The hot water mixing valve control unit corrects the opening degree of the hot water mixing valve so that the mixing ratio of water is higher than the target opening degree, and the hot water supply by the bath hot water filling circuit is set in advance. When satisfying either the condition that the opening-returning hot water filling time is continued or the condition that the accumulated flow rate of hot water supply by the bath hot water filling circuit is equal to or greater than the preset target opening returning hot water filling integrated flow rate The hot water supply apparatus returns the opening degree of the hot water mixing valve so that the hot water supply temperature of the hot water supply circuit becomes the target hot water supply temperature. In the hot water supply device according to any one of claims 1 to 4, or claim 9 or claim 10 ,
The bath circuit has a bath filling circuit that mixes hot water in the upper part of the hot water storage tank and water supplied from the outside to supply hot water to the bath,
The hot water mixing valve control unit presets the integrated flow rate of hot water supply by the bath hot water filling circuit in a state where the opening degree of the hot water mixing valve is corrected so that the mixing ratio of water is higher than the target opening degree. Of the hot water supply circuit when the condition that the target hot water replenishment time is maintained and the hot water supply by the bath hot water filling circuit is equal to or greater than the preset target opening return hot water integrated flow rate is satisfied. A hot water supply apparatus, wherein the opening degree of the hot water supply mixing valve is returned so that the hot water supply temperature becomes the target hot water supply temperature. In the hot water supply device according to any one of claims 1 to 12,
The hot-water supply mixing valve control unit, when a preset target opening return time elapses from the time when the opening degree of the hot-water supply mixing valve is corrected so that the mixing ratio of water is higher than the target opening degree, A hot water supply apparatus, wherein an opening degree of the hot water supply mixing valve is returned so that a hot water supply temperature of the circuit becomes the target hot water supply temperature. In the hot water supply device according to any one of claims 1 to 12,
The bath circuit is
A bath circulation circuit that circulates hot water from the bath through a heat exchanger;
A bath cooling circuit that circulates the water in the lower part of the hot water storage tank through the reheating heat exchanger and cools the hot water in the bath to make it warm.
The hot water supply apparatus characterized in that the water side pipe of the bath cooling circuit and the water side pipe of the hot water supply circuit have a common pipe portion. The hot water supply apparatus according to claim 14,
The hot water mixing valve control unit corrects the opening degree of the hot water mixing valve so that the mixing ratio of water is higher than the target opening degree when the bath cooling circuit starts cooling the hot water of the bath. A hot water supply device. The hot water supply device according to claim 14 or 15,
A bath cooling control unit for controlling the bath cooling circuit;
The bath cooling control unit does not cool the bath water by the bath cooling circuit when the temperature of the lower water in the hot water storage tank is equal to or higher than the bath cooling prohibition temperature. The hot water supply apparatus according to claim 16,
The bath cooling control unit is configured such that the temperature of the lower water in the hot water storage tank is equal to or higher than the bath cooling prohibition temperature, and the temperature of the lower water in the hot water storage tank and the temperature of the water supplied from the outside. When the difference is equal to or higher than the bath cooling prohibition temperature difference, the hot water supply device of the hot water supply device is not cooled by the bath cooling circuit. The hot water supply device according to claim 14 or 15,
A hot water supply apparatus comprising a bath cooling control unit for controlling the bath cooling circuit, wherein the bath cooling control unit does not cool the hot water of the bath by the bath cooling circuit during hot water supply by the hot water supply circuit. In the hot water supply device according to any one of claims 1 to 18,
The hot water side piping of the boiling circuit and the hot water side piping of the hot water supply circuit have a common piping part,
The hot water mixing valve control unit corrects the opening degree of the hot water mixing valve so that the mixing ratio of water is higher than the target opening degree when the boiling circuit starts boiling of hot water in the hot water storage tank. A hot water supply apparatus characterized by the above. The hot water supply apparatus according to claim 19,
The hot water mixing valve opening correction unit, during the boiling operation by the boiling circuit, the temperature of the hot water in the upper part of the hot water storage tank is lower than the hot water temperature of the heat pump unit connected to the boiling circuit, In addition, when the temperature difference between the hot water temperature and the temperature of the hot water in the upper part of the hot water storage tank is equal to or higher than a preset temperature, the water mixing ratio of the hot water mixing valve is higher than the target opening. The hot water supply device is characterized by correcting as follows. The hot water supply apparatus according to claim 19,
A reheating circuit that recirculates hot water in the upper part of the hot water storage tank and circulates it through a heat exchanger to replenish the hot water in the bath,
The hot water mixing valve opening correction unit adjusts the opening of the hot water mixing valve from the target opening when the reheating operation by the reheating circuit and the boiling operation by the boiling circuit are performed simultaneously. The hot water supply device is characterized in that it is corrected so as to be higher.

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