JP2007218520A - Storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce running cost by ensuring a necessary minimum hot water quantity in spite of miniaturization of a hot water tank and reducing the ratio of boiling in a daytime zone with a high power rate. <P>SOLUTION: This water heater comprises a residual hot water quantity calculation means 31 for calculating a residual hot water quantity in a hot water storage tank 1, and a residual hot water quantity setting means 38 for setting a start residual hot water quantity for starting hot water outage boiling operation and a stop residual hot water quantity for stopping hot water outage boiling operation to optional values in time bases. Start and stop of a heating means 14 are performed based on the start hot water residual quantity and stop hot water residual quantity set by the setting means 38 and the residual hot water quantity calculated by the calculation means 31, and at the time of starting the heating means 14, its heating capability is changed according to the value of the start residual hot water quantity set by the setting means 38. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hot water storage type hot water supply apparatus that uses electric power to boil hot water, and more particularly to a hot water storage type hot water supply apparatus that uses a heat pump cycle using carbon dioxide as a refrigerant.

  Conventionally, in a hot water storage hot water supply system that uses midnight power to boil the entire tank, all the water filled in the hot water tank is boiled in the midnight hours when the electricity rate is low, and the daytime The general idea was to cover the hot water used for the belt. For this reason, the capacity of the hot water storage tank has been selected in accordance with the upper limit of the amount of hot water used in one day.

However, in recent years, due to the downsizing of equipment and diversification of usage patterns, in addition to the full-boiling operation during the midnight hours, the hot-water boiling operation is also performed during the daytime hours. There has been proposed one that performs a boiling operation to compensate for an insufficient amount of hot water. (For example, refer to Patent Document 1).
JP 2003-161545 A

  However, the above-mentioned conventional hot water storage type hot water supply apparatus requires a large hot water storage tank that matches the upper limit of the amount of hot water used, which increases the size of the product, requires a large installation space, and increases the initial cost. There was a problem to do. In order to solve this problem, when the hot water storage tank is downsized, it is necessary to deal with running out of hot water, and in preparation for a large amount of hot water such as a hot water bath, as described in Patent Document 1, it is a daytime time zone. It is necessary to ensure a certain amount of hot water by frequently performing a hot water boiling operation in. In addition, since the heating capacity at the time of boiling water boiling operation is performed with a constant capacity, the inside of the hot water tank is operated with a constant heating capacity regardless of the amount of remaining hot water at the start of boiling water boiling and always boiled. Even if there is a large amount of hot water remaining, even if there is a large amount of remaining hot water, inefficient operation will be performed with the same heating capacity, and water that should be boiled in the midnight hours when the electricity rate is low Since only a small amount remains in the tank, as a result, the ratio of boiling during the daytime hours when the power rate is high is increased, resulting in an increase in running cost.

  The present invention solves the above-mentioned problem, selects the tank capacity based on the amount used when bathing is hot water, and reduces the size of the hot water storage tank. In addition to changing the amount of hot water at the start of boiling in the belt and changing the heating capacity according to the value of the amount of remaining hot water, even if the hot water storage tank is downsized, the necessary minimum amount of hot water is secured and The purpose is to reduce the running cost by reducing the boiling ratio in the high daytime hours and setting the efficient heating capacity.

In order to achieve the above object, the present invention guides the hot water storage tank, the hot water discharge pipe provided at the upper part of the hot water storage tank, the water supply pipe provided at the lower part of the hot water storage tank, and the water at the lower part of the hot water storage tank to the upper part. A boiling pipe, a boiling pump provided in the boiling pipe, a heating means disposed in the middle of the boiling pipe for heating water supplied by the boiling pump, and a remaining in the hot water storage tank A remaining hot water amount calculating means for calculating the amount of hot water, and setting a time zone for performing the total boiling operation, and setting to perform a hot water boiling operation when a predetermined remaining hot water amount is calculated by the remaining hot water amount calculating means A hot water storage type hot water supply device, wherein the remaining hot water amount setting means for setting the remaining hot water amount to start the hot water boiling operation and the stopped hot water amount to stop the hot water boiling operation to an arbitrary value by time, and the remaining hot water amount By setting means A hot water boiling operation discriminating means for determining whether to start and stop the heating means based on the determined remaining hot water amount and the stopped remaining hot water amount and the remaining hot water amount calculated by the remaining hot water amount calculating means, and a hot water boiling operation Hot water temperature / capacity level changing means for setting the heating capacity according to the set value of the amount of starting remaining hot water set by the remaining hot water volume setting means at the start,
The heating means performs a hot water boiling operation with the heating capacity set by the hot water temperature / capability level changing means.

  According to the above invention, the amount of remaining hot water is set as the start condition of the hot water boiling operation performed during the daytime period, and the amount of remaining hot water is set as the stop condition of the hot water boiling operation. Set the remaining hot water amount to an arbitrary value for each hour in the time zone when the hot water boiling operation is performed, and set the heating capacity when performing the hot water boiling operation to the set value of the starting residual hot water amount. Therefore, even if the hot water storage tank is downsized to reduce the installation space and initial cost, it is necessary to ensure the optimal amount of hot water remaining according to the daily hot water usage. It is possible to ensure an efficient boiling operation without performing a wasteful hot water boiling operation, and to secure the necessary amount of hot water in advance in response to a hot water filling operation that uses a large amount of hot water. It is possible, it is possible to solve the water shortage phenomenon after the hot water filling operation by starting the boiling hot water out operation at an early stage in the hot water filling operation. In other words, boiling during the daytime power supply time period is kept to a minimum to prevent running out of hot water, and the heating capacity at that time is balanced with urgency and optimum efficiency according to the amount of remaining hot water. Since the water to be boiled in the time zone can be secured in the hot water storage tank, the running cost can be minimized. And when optimizing the installation space, initial cost and running cost, the running cost increase due to the miniaturization of the hot water storage tank can be reduced, so the capacity of the hot water storage tank can be reduced and the total cost reduction In addition, the installation can be improved.

  According to the present invention, the start and stop conditions of the hot water boiling operation performed during the daytime period are set by changing the start remaining hot water amount and the stopped residual hot water amount according to time, and when performing the hot water boiling operation. Since the heating capacity is changed according to the set value of the amount of remaining hot water to start, even when the hot water storage tank is downsized, it is possible to realize a boiling operation that secures the optimal amount of hot water according to the hot water usage. Therefore, it is possible to provide a hot water storage type hot water supply apparatus that does not run out of hot water and has a low running rate and a low boiling-up ratio in a daytime period when the power rate is high.

The first invention is a hot water storage tank, a hot water pipe provided at the upper part of the hot water storage tank, a water supply pipe provided at the lower part of the hot water storage tank, a boiling pipe for guiding the water at the lower part of the hot water storage tank to the upper part, A boiling pump provided in the boiling pipe; heating means disposed in the middle of the boiling pipe for heating water supplied by the boiling pump; and a remaining amount for calculating the amount of remaining hot water in the hot water storage tank A hot water storage type hot water supply device that includes a hot water amount calculating means, sets a time zone for performing a full boiling operation, and sets a hot water boiling operation when a predetermined remaining hot water amount is calculated by the remaining hot water amount calculating means. And the remaining hot water amount setting means for setting the remaining hot water amount for starting the hot water boiling operation and the stopped remaining hot water amount for stopping the hot water boiling operation to an arbitrary value according to time, and the remaining hot water amount setting means. Amount of hot water left Hot water boiling operation determining means for determining whether to start or stop the heating means based on the remaining hot water amount calculated by the stopped hot water amount and the remaining hot water amount calculating means, and the remaining hot water amount setting at the start of the hot water boiling operation Hot water temperature / capacity level changing means for setting the heating capacity in accordance with the set value of the starting residual hot water amount set in the means,
The heating means is characterized in that the hot water boiling operation is performed with the heating capacity set by the hot water temperature / capacity level changing means.

  Then, the amount of remaining hot water is set as the start condition for the hot water boiling operation performed during the daytime period, the amount of remaining hot water is set as the stop condition for the hot water boiling operation, and the amount of remaining hot water and the amount of remaining hot water are set. Set the value to an arbitrary value for each hour in the time zone when the hot water boiling operation is performed, and change the heating capacity when performing the hot water boiling operation according to the set value of the remaining hot water amount Therefore, even when the hot water storage tank is downsized to reduce the installation space and initial cost, it is possible to ensure the optimal amount of hot water remaining according to the daily hot water usage and waste It is possible to ensure an efficient boiling operation without performing a hot water boiling operation, and to secure the required amount of hot water beforehand in response to a hot water filling operation that uses a large amount of hot water. Rutotomoni, it is possible to eliminate the hot water shortage phenomenon after the hot water filling operation by starting the boiling hot water out operation at an early stage in the hot water filling operation. In other words, boiling during the daytime power supply time period is kept to a minimum to prevent running out of hot water, and the heating capacity at that time is balanced with urgency and optimum efficiency according to the amount of remaining hot water. Since the water to be boiled in the time zone can be secured in the hot water storage tank, the running cost can be minimized. And when optimizing the installation space, initial cost and running cost, the running cost increase due to the miniaturization of the hot water storage tank can be reduced, so the capacity of the hot water storage tank can be reduced and the total cost reduction In addition, the installation can be improved.

  In a second aspect of the invention, in particular, in the first aspect of the invention, the remaining hot water amount setting means is set so that the amount of remaining hot water is small when the amount of remaining hot water is small and the amount of remaining hot water is increased when the amount of remaining hot water is large. It is a feature.

  And in the time zone from the morning to the evening when the amount of hot water used is small, the starting residual hot water amount, which is the starting condition of the hot water boiling operation, is set to the minimum value, and it is set to a condition that makes it difficult to enter the boiling operation. The amount of remaining hot water that is a stop condition is also set to a value that secures the minimum required amount of hot water, thereby suppressing unnecessary boiling operation. In addition, in the time zone that includes the bath hot water operation from the evening when the amount of hot water used increases, the starting hot water amount that is the start condition of the hot water boiling operation is set to the maximum value, and the condition that makes it easy to enter the heating operation is set. The remaining amount of hot water that is the stop condition at that time is set to a value that can secure the maximum amount of hot water, so that the amount of hot water necessary for hot water filling operation can be secured, and the hot water boiling operation during hot water filling operation By reliably performing the operation, it is possible to eliminate the hot water phenomenon after the hot water filling operation.

  In a third aspect of the invention, particularly in the first or second aspect of the invention, the remaining hot water amount setting means is set so that the amount of remaining hot water to start and the amount of remaining hot water is maximized in a time zone in which a hot water filling operation is performed. It is what.

  And, in the time zone when the hot water bathing operation in which a large amount of hot water is used is performed, the starting residual hot water amount which is the start condition of the hot water boiling operation is set to the maximum value, and the condition is set to be easy to enter the boiling operation. The remaining amount of hot water that is the stop condition at that time is set to a value that can secure the maximum amount of hot water, so that the amount of hot water necessary for hot water filling operation can be secured, and the hot water boiling operation during hot water filling operation By reliably performing the operation, it is possible to eliminate the hot water phenomenon after the hot water filling operation.

  According to a fourth aspect of the present invention, in particular, in any one of the first to third aspects of the invention, the heating means has a set value of the starting remaining hot water amount set by the remaining hot water amount setting means when the hot water boiling operation is started. The smaller the temperature, the larger the heating capacity, and the hot water boiling operation is performed.

And since the amount of hot start hot water is set to a small value, and when the hot water boiling operation is started with only a small amount of hot water remaining in the tank, urgent is necessary, the heating means has the maximum When the amount of remaining hot water is set to a large value and the amount of remaining hot water in the tank is slightly reduced, the remaining amount of hot water in the tank is sufficiently secured. Since it is in a state and does not require much urgency, the heating capacity is reduced and efficient operation is performed. In this way, by changing the heating capacity according to the set value of the amount of remaining hot water for startup, that is, the amount of hot water in the tank at the start of hot water boiling operation, the urgency of securing hot water and the optimization of the operating efficiency of the heating means can be achieved. It is possible to perform a boiling operation while ensuring a balance.

  In a fifth aspect of the invention, in particular, in any one of the first to fourth aspects of the invention, the heating means is a heat pump cycle in which a compressor, a radiator, an expansion valve, and an evaporator are connected by a pipe, The capacity of the compressor is increased during the hot water boiling operation.

  And when the amount of remaining hot water decreases and it becomes necessary to secure the required amount of hot water urgently, it is possible to store a predetermined amount of hot water in a short time by increasing the capacity of the compressor and performing a hot water boiling operation. it can.

  According to a fifth aspect of the present invention, the heating means is a heat pump cycle in which a compressor, a radiator, an expansion valve, and an evaporator are connected by piping, the refrigerant used in the heat pump cycle is carbon dioxide, and the state exceeds the critical pressure on the high pressure side It is characterized by driving in.

  Further, hot water close to 90 ° C. can be stored, and hot water of about 65 ° C. considering Legionella bacteria can be stored at a high COP.

  An embodiment of the present invention will be described below with reference to the drawings. In addition, this invention is not limited by a present Example.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram of a hot water storage type hot water supply apparatus according to an embodiment of the present invention.

  A hot water discharge pipe 2 is provided at the upper part of the hot water storage tank 1, and a water supply pipe 3 is provided at the lower part of the hot water storage tank 1. The lower part and the upper part of the hot water storage tank 1 are communicated with each other by a boiling pipe 4, and the water in the lower part of the hot water storage tank 1 is led to a heat exchanger 6 by a boiling pump 5 and heated by the heat exchanger 6 to become hot water. The hot water storage tank 1 is guided to the upper part. When hot water is supplied from the hot water discharge pipe 2, water is supplied from the water supply pipe 3 into the hot water storage tank 1, and in the hot water storage tank 1, the hot water is separated into the upper part and the water from the lower part due to the difference in specific gravity, and the hot water is pushed down. Accumulated in layers. The hot water storage tank 1 is provided with a plurality of remaining hot water temperature detectors 7 for detecting the hot water temperature in the upper part from the lower part of the hot water storage tank 1.

  Here, the remaining hot water temperature detector 7 a disposed at the bottom of the hot water storage tank 1, the remaining hot water temperature detector 7 b disposed above the remaining hot water temperature detector 7 a, and the uppermost portion of the hot water storage tank 1 are disposed. The remaining hot water temperature detector 7e and the remaining hot water temperature detectors 7d and 7c arranged in order below the remaining hot water temperature detector 7e are provided. For example, if the total capacity of the hot water storage tank 1 is 150L, the remaining hot water temperature detector 7a is disposed at a position of 130L, and when the remaining hot water temperature detector 7a detects the hot water temperature above a predetermined temperature, the hot water storage tank 1 has a remaining hot water amount detection function for determining that 130 L or more is stored as the available hot water amount. Similarly, the remaining hot water temperature detector 7b is disposed at a position of 100L, and when the remaining hot water temperature detector 7b detects a hot water temperature of a predetermined temperature or higher, the amount of hot water that can be used in the hot water storage tank 1 is 100L or higher. Judged to be stored.

  Further, the remaining hot water temperature detector 7c is disposed at 80L, the remaining hot water temperature detector 7d is disposed at 50L, the remaining hot water temperature detector 7e is disposed at 20L, and whether or not 80L, 50L, and 20L are stored as the remaining hot water amounts, respectively. The signal which judges is output. As a criterion for determining the amount of remaining hot water, for example, when each remaining hot water temperature detector 7a, 7b, 7c, 7d, 7e falls below 45 ° C., it is determined that there is no remaining hot water amount and boiling out boiling is necessary. to decide. When the detected temperature reaches, for example, 60 ° C. or higher or a set temperature, it is determined that there is a remaining amount of hot water, and boiling is stopped. That is, the remaining hot water temperature detectors 7a, 7b, 7c, 7d, and 7e are the remaining hot water amount detectors 7e, 7d, 7c, 7b, which are arranged at the respective positions when the detected temperature is, for example, 60 ° C. or higher or the set temperature. There is hot water up to the installation position of 7a, and it is determined that there is no hot water when the temperature falls below 45 ° C. Chattering is prevented by using 45 ° C. and 60 ° C. or a set temperature as a judgment temperature.

  The heating means 14 includes a heat pump cycle in which the compressor 10, the radiator 6, the expansion valve 12, and the evaporator 11 are connected by piping. This heat pump cycle preferably uses carbon dioxide as a refrigerant and is operated in a state exceeding the critical pressure on the high pressure side. By using such a heat pump cycle, hot water close to 90 ° C. can be stored, and hot water storing about 65 ° C. considering Legionella bacteria can be stored at a high COP.

  An incoming water temperature detector 13 a is provided in the boiling pipe 4 leading to the heat exchanger 6, and a tapping temperature detector 13 b is provided in the boiling pipe 4 on the outlet side of the heat exchanger 6. In addition, the hot water storage type hot water supply apparatus according to the present embodiment includes an outside air temperature detector 13c that detects the outside air temperature.

  In the above configuration, during the boiling operation, the boiling pump 5 and the compressor 10 are operated. For example, when the boiling temperature is 90 ° C., the boiling pump 5 is adjusted to an appropriate flow rate and controlled so that the temperature of the tapping temperature detector 13b becomes 90 ° C. The temperature of the tapping water can also be controlled by controlling the heat pump cycle such as the rotational speed of the compressor 10 and the opening degree of the expansion valve 12. With the above operation, hot water of 90 ° C. is stored in the hot water storage tank 1 in order from the top, and when the incoming water temperature detector 13a detects a predetermined temperature, for example, 60 ° C., the hot water of 90 ° C. has reached the lower part of the hot water storage tank 1. Judgment is made, the boiling pump 5 and the compressor 10 are stopped, and the boiling operation is finished.

  In the hot water storage type hot water supply apparatus according to the present embodiment, a first predetermined time zone and a second predetermined time zone are set. The first predetermined time zone is, for example, a midnight time zone from 23:00 to 7 o'clock, including a time zone in which the heat exchanger 6 is operated and the whole amount boiling operation is performed, and includes a peak shift time zone. Yes. The peak shift time zone is a time zone in which the entire amount boiling operation is waited. The second predetermined time zone is, for example, a daytime time zone from 7 o'clock to 23 o'clock, and is a time zone during which no full boiling operation is performed. In the peak shift time zone and the second predetermined time zone, when it is determined that the amount of hot water is insufficient in the full-boiling operation, the hot water boiling-up operation is performed.

  The hot water storage type hot water supply apparatus of the present embodiment compares the information from the remaining hot water amount calculating means 31 and the remaining hot water amount setting means 38 and determines the start and stop of the hot water boiling operation, and the temperature Detection means 32. The hot water temperature / capacity level changing unit 33 sets the boiling water temperature and sets the capacities of the pump 5 and the compressor 10 based on signals from the hot water boiling operation discriminating unit 39 and the temperature detecting unit 32. The boiling operation control unit 34 controls the capacities of the pump 5 and the compressor 10 based on the set contents in the hot water temperature / capacity level changing unit 33. The operation unit 35 has bath automatic setting means. When the setting is input by the bath automatic setting means, the operation unit 35 outputs a setting signal to the hot water temperature / capacity level changing means 33 and the automatic bath filling means 36. In response to this, an operation start signal is output. The automatic bath filling means 36 mixes the hot water from the upper part of the hot water storage tank 1 and the cold water from the water supply pipe 3 so that the hot water temperature is set in advance, and supplies a preset hot water amount to the bathtub 37. To do.

  The remaining hot water amount calculation means 31 calculates the remaining hot water amount from the hot water temperature at each position in the hot water storage tank 1 detected by the remaining hot water temperature detector 7, and the specific method is predetermined as described above. The upper and lower reference temperatures (for example, 45 ° C. and 60 ° C. or more) are compared with the temperature detected by the remaining hot water temperature detector 7. When the temperature is equal to or higher than the reference temperature, it is determined that there is a remaining hot water amount at each position, and a signal indicating the current remaining hot water amount is output.

  The remaining hot water amount setting means 38 arbitrarily sets the starting remaining hot water amount, the stopped remaining hot water amount, or the starting remaining hot water amount and the stopped remaining hot water amount according to time, and the start condition of the hot water boiling operation performed in the daytime time period and the peak shift time period. Stop conditions are set in a pattern. Here, the starting remaining hot water amount is a set value of the remaining hot water amount at which the hot water boiling operation is started. When the remaining hot water amount in the hot water storage tank 1 falls below the starting remaining hot water amount, the hot water boiling operation is started. Specifically, when the remaining hot water amount signal output from the remaining hot water amount calculating means 31 falls below the starting remaining hot water amount signal set by the remaining hot water amount setting means 38, a boiling start signal is output.

  The remaining hot water amount is a set value of the remaining hot water amount at which the hot water boiling operation is stopped. When the remaining hot water amount in the hot water storage tank 1 exceeds this stopped remaining hot water amount by the boiling operation, the hot water boiling operation is stopped. To do. Specifically, when the remaining hot water amount signal output from the remaining hot water amount calculating unit 31 exceeds the stopped remaining hot water amount signal set by the remaining hot water amount setting unit 38, a boiling stop signal is output.

  Then, as shown in FIG. 2, the amount of remaining hot water and the amount of remaining hot water are set to arbitrary values according to time, and the appropriate amount of hot water is obtained by efficient boiling operation corresponding to the use situation of hot water according to the life pattern. I try to secure it.

  To explain in more detail with reference to FIG. 2, for example, from 7 am to 10 am in the morning, the amount of hot water used is relatively high, but a large amount of hot water is heated in the hot water storage tank 1 due to the entire night boiling operation. Since the amount of hot water is secured and it is possible to use this hot water, the amount of remaining hot water for start-up in this time zone is set to a low level so that it is difficult to enter the hot water boiling operation. Even if the amount of hot water used increases and it enters into the boiling out operation, it is not necessary to use a large amount of boiling water in consideration of the fact that hot water is not used much in the subsequent time zone. Therefore, the amount of remaining hot water during this period is set to a small value so that the amount of boiling water is reduced. Next, from 10:00 to 17:00, it is a time zone in which the amount of hot water used is the smallest in one day, and this time zone is set to be lower than the amount of remaining hot water starting from 7:00 to around 10:00, Set it to a state where it is more difficult to enter the hot water boiling operation.

  Then, by setting the amount of remaining hot water to be even smaller, it is possible to limit the heating operation during the daytime hours when the power rate is high.

  And in the time zone where the amount of hot water used is the largest in the day from 17:00 to around 20:00 including the bathing time zone, to set the starting remaining hot water amount to the maximum and prepare for the bathing time zone Start the boiling operation in advance, operate to ensure the required amount of hot water, and start the hot water boiling operation even if the amount of hot water in the hot water storage tank 1 is slightly reduced by starting the hot water filling operation, By performing the boiling operation during the hot water filling operation, the amount of hot water is secured when the shower is used thereafter. Further, the remaining hot water amount during this time period is set to the highest value so that substantially the entire hot water storage tank 1 is boiled.

Then, after 20:00 when the bathing time period ends, the amount of remaining hot water and the amount of remaining hot water are set small, and the amount of boiling water is refrained, so that the boiling rate in the low-night time period when the electricity rate is low is increased. . And after 23:00, it becomes a midnight time zone, and the peak shift time zone passes and the whole amount boiling operation is started. Naturally, the amount of remaining hot water for starting and the amount of remaining hot water for stopping are set to be small in this peak shift time zone, and the amount of hot water to be heated is refrained.

  As described above, by setting the amount of remaining hot water and the amount of hot water to stop at any time, it is possible to ensure an appropriate amount of hot water through efficient boiling operation corresponding to the usage of hot water according to the lifestyle pattern. Can do.

  The hot water boiling operation discriminating means 39 is the amount of remaining hot water in the hot water storage tank 1 calculated by the remaining hot water amount and the remaining hot water amount calculating means 31 which is set in detail by the remaining hot water amount setting means 38 for each time zone as described above. If it is determined that it is necessary to start the hot water boiling operation or whether the hot water boiling operation should be stopped, and if it is determined that the hot water boiling operation is necessary, The operation instruction information is output to the hot water temperature / capability level changing means 33 and the boiling operation control means 34 together with the setting data of the amount of remaining hot water. The temperature detection means 32 outputs the temperature signals detected by the incoming water temperature detector 13a, the outgoing water temperature detector 13b, and the outside air temperature detector 13c to the hot water temperature / capability level changing means 33 and the boiling operation control means 34.

  With the above configuration, for example, when the remaining hot water temperature calculating unit 31 detects that the remaining hot water temperature detector 7 corresponding to the set value of the activated remaining hot water amount set by the remaining hot water amount setting unit 38 is lower than 45 ° C. Then, the hot water temperature / capacity level changing means 33 sets the same boiling temperature (for example, 85 ° C.) as in the full boiling operation, at a position corresponding to the set value of the remaining activated hot water amount, that is, the activated remaining hot water amount. The hot water boiling operation is performed with a heating capacity set according to the amount of remaining hot water in the tank at which no remaining hot water is detected at the detected temperature of the provided temperature detector 7. In the hot water boiling operation, an operation signal is output from the boiling operation control means 34 to the pump 5 and the compressor 10 based on the set temperature and the heating capacity. Further, the temperature detection means 32 detects the temperature of the hot water in the hot water temperature detector 13b, and the hot water temperature / capacity level changing means 33 causes the pump 5 so that the temperature of the hot water reaches a target boiling temperature (for example, 85 ° C.). And the capability of the compressor 10 is changed.

  The amount of boiling water increases by the above-mentioned boiling operation, and the remaining hot water temperature detector 7 provided at the position corresponding to the set value of the stopped remaining water amount set by the remaining hot water amount setting means 38 has exceeded the set temperature. When detected by the hot water amount calculation means 31, the operation of the pump 5 and the compressor 10 is stopped by the boiling operation control means 34. In addition, when setting the amount of remaining hot water to the maximum, the temperature of the remaining hot water temperature detector 7a at the bottom may reach the set temperature, and the temperature detecting means is a stop condition when the whole amount is heated. 32, the incoming water temperature at the incoming water temperature detector 13a is detected. When the incoming water temperature reaches a target boiling temperature (for example, 85 ° C.), the operation of the pump 5 and the compressor 10 is stopped by the boiling operation control means 34. You may do it. The outside air temperature at the outside air temperature detector 13c is detected by the temperature detecting means 32, and the target boiling temperature is set and changed according to the outside air temperature.

  Next, the control flow of the hot water storage type hot water supply apparatus of the present embodiment will be described with reference to FIG.

  First, the boiling water temperature / capacity is determined by the hot water temperature / capacity level changing means 33 (step 1). Then, from the current time, it is determined whether or not it is a daytime time zone (second predetermined time zone) (step 2). If the present time is the second predetermined time zone, the remaining hot water amount calculated by the remaining hot water amount calculating means 31 from the detected temperatures of the remaining hot water temperature detectors 7a, 7b, 7c, 7d and 7e is determined by the remaining hot water amount setting means 38. It is judged whether or not the amount of remaining hot water set for each hour is below (step 3).

In step 3, when the tank remaining hot water amount calculated by the remaining hot water amount calculating means 31 is not less than the startup remaining hot water amount, the remaining hot water monitoring is continued (step 4). In step 3, when the amount of remaining hot water in the tank falls below the amount of remaining hot water, heating is performed by the hot water temperature / capacity level changing means 33 based on the set value of the amount of remaining hot water by time set by the remaining hot water amount setting means 38. The capacity is set (step 5). For example, when the startup remaining hot water amount is set to a small value, the capacity of the compressor 10 is set to a capacity (for example, 4.5 kW) higher than the capacity (for example, 4.5 kW) at the time of full-boiling operation. 9 kW) (step 6) and a hot water boiling operation is performed (step 7). In addition, since the hot water boiling operation is a boiling operation performed when the remaining hot water amount decreases in the daytime period, the urgency with respect to the hot water is different depending on the setting value of the starting residual hot water amount, but it is performed at midnight. From the judgment that it is more urgent than the full-boiling operation, the heating capacity during the hot water boiling operation is set to a higher value than during the full-boiling operation. The value is based on the set value of the amount of remaining activated hot water determined in step 5 between the capacity during the total amount boiling operation and the maximum capacity possessed by the heating means 14 (for example, 4.5 kW to 9 kW). Therefore, in step 5, when the amount of hot start hot water is set high, a heating capacity smaller than 9 kW is set.

  Then, the remaining hot water amount calculated by the remaining hot water amount calculating means 31 from the temperature detected by the remaining hot water temperature detectors 7a, 7b, 7c, 7d and 7e is the remaining hot water amount set by the remaining hot water amount setting means 38 for each time zone. It is determined whether or not it exceeds (step 8).

  If the amount of remaining hot water in the tank does not exceed the amount of remaining hot water in Step 8, the hot water boiling operation is continued (Step 7). If it is determined in step 8 that the amount of remaining hot water in the tank exceeds the amount of remaining hot water, the hot water boiling operation is stopped (step 9).

  If it is determined in step 2 that it is not the second predetermined time zone, it is determined whether or not it is a peak shift time zone (step 10).

  If it is determined in step 10 that it is a peak shift time zone, the remaining hot water amount is calculated from the remaining hot water temperature detectors 7a, 7b, 7c, 7d, and 7e as in the case of the daytime time zone. It is determined whether or not the tank remaining hot water amount calculated by the means 31 is less than the starting remaining hot water amount set for each time zone by the remaining hot water amount setting means 38 (step 11).

  In step 11, if the tank remaining hot water amount is not less than the startup remaining hot water amount, the remaining hot water monitoring is continued (step 12). In Step 11, when the tank remaining hot water amount is lower than the startup remaining hot water amount, similarly to the above, the set value of the startup remaining hot water amount for each time set by the remaining hot water amount setting unit 38 by the hot water temperature / capability level changing unit 33. (Step 13), for example, when the amount of remaining hot water for starting is set to a small value, the capacity of the compressor 10 is set to be greater than the capacity during the boiling operation (for example, 4.5 kW). The capacity is changed to a high capacity (for example, 9 kW) (step 14), and the hot water boiling operation is performed (step 15). The setting of the heating capacity is the same as described above, and a description thereof is omitted.

  Then, it is determined whether or not the amount of remaining hot water in the tank exceeds the amount of remaining hot water set by the remaining hot water amount setting means 38 (step 16).

  If the tank remaining hot water amount does not exceed the stop remaining hot water amount in step 16, the hot water boiling operation is continued (step 15). If it is determined in step 16 that the amount of remaining hot water in the tank exceeds the amount of remaining hot water, the hot water boiling operation is stopped (step 17).

  If it is determined in step 10 that it is not the peak shift time zone, it is determined whether or not the temperature detected by the incoming water temperature detection means 13a has reached a predetermined temperature at the end of the second predetermined time zone (step 18). ).

If it is determined in step 18 that the temperature detected by the incoming water temperature detecting means 13a has not reached the predetermined temperature, the whole amount boiling operation is performed as planned (step 19). If it is determined in step 18 that the temperature detected by the incoming water temperature detection means 13a is equal to or higher than the predetermined temperature, the whole amount boiling operation is not performed (step 20).

  The hot water storage type hot water supply apparatus of the present invention is particularly useful for a hot water storage type hot water supply apparatus using a heat pump cycle using carbon dioxide as a refrigerant, and can also be applied to a hot water storage type hot water supply apparatus using a heater or gas as a heat source.

The block diagram of the hot water storage type hot water supply apparatus by one Example of this invention The figure which shows the operation of the hot water boiling operation of the hot water storage type water heater Control flow diagram of the hot water storage type hot water supply device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Hot water supply pipe 3 Water supply pipe 4 Boiling piping 5 Boiling pump 6 Heat exchanger 7a Remaining hot water temperature detector 7b Remaining hot water temperature detector 7c Remaining hot water temperature detector 7d Remaining hot water temperature detector 7e Remaining hot water temperature detection 10 Compressor 11 Evaporator 12 Expansion valve 14 Heat pump cycle (heating means)
31 Remaining hot water amount calculating means 32 Temperature detecting means 33 Hot water temperature / capacity level changing means 34 Boiling operation control means 35 Operation unit 36 Bath automatic hot water filling means 37 Bathtub 38 Remaining hot water amount setting means 39 Hot water boiling operation determining means

Claims (6)

A hot water storage tank, a hot water pipe provided in the upper part of the hot water storage tank, a water supply pipe provided in the lower part of the hot water storage tank, a heating pipe for guiding water in the lower part of the hot water storage tank to the upper part, and provided in the heating pipe A heating pump for heating water supplied by the boiling pump disposed in the middle of the boiling piping, and a remaining hot water amount calculating means for calculating the remaining hot water amount in the hot water storage tank. ,
A hot water storage type hot water supply apparatus that sets a time zone for performing a total amount boiling operation, and sets a hot water boiling operation when the predetermined remaining hot water amount is calculated by the remaining hot water amount calculating means,
The remaining hot water amount setting means for setting the start remaining hot water amount for starting the hot water boiling operation and the stopped remaining hot water amount for stopping the hot water boiling operation to an arbitrary value according to time, and the remaining start amount set by the remaining hot water amount setting means A hot water boiling operation discriminating means for determining whether to start and stop the heating means based on the amount of hot water, the amount of remaining hot water and the amount of remaining hot water calculated by the means for calculating the remaining hot water; Hot water temperature / capacity level changing means for setting the heating capacity according to the set value of the startup residual hot water amount set by the setting means,
The hot water storage type hot water supply apparatus in which the heating means performs a hot water boiling operation with a heating capacity set by the hot water temperature / capability level changing means. The hot water storage type hot water supply apparatus according to claim 1, wherein the remaining hot water amount setting means is set such that the amount of remaining hot water is small when the amount of remaining hot water is small and the amount of remaining hot water is increased when the amount of remaining hot water is large. The hot water storage hot water supply apparatus according to claim 1 or 2, wherein the remaining hot water amount setting means is set so that the amount of remaining hot water and the amount of remaining hot water are maximized in a time zone in which a bath hot water filling operation is performed. When the hot water boiling operation is started, the heating means sets the heating capacity to be larger and performs the hot water boiling operation as the set value of the starting remaining hot water set by the remaining hot water setting means is smaller. The hot water storage type hot water supply apparatus according to any one of claims 1 to 3. The heating means is a heat pump cycle in which a compressor, a radiator, an expansion valve, and an evaporator are connected by piping, and the capacity of the compressor is increased at the time of boiling out boiling operation than at the time of full boiling operation. The hot water storage type hot water supply apparatus according to any one of claims 1 to 4. The heating means is a heat pump cycle in which a compressor, a radiator, an expansion valve, and an evaporator are connected by piping, and the refrigerant used in the heat pump cycle is carbon dioxide, and the high pressure side is operated in a state exceeding the critical pressure. The hot water storage type hot water supply apparatus according to any one of claims 1 to 5.

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