JP2007093135A - Hot water storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure a minimum necessary hot water quantity even when a hot water storage tank is miniaturized, and to reduce running costs by reducing the ratio of boiling-up in a daytime zone of high electric power charge. <P>SOLUTION: This hot water storage type water heater has a hot water remaining quantity calculating means 31 for calculating hot water remaining quantity in the hot water storage tank 1, and a hot water remaining quantity setting means 38 for hourly setting start hot water remaining quantity to judge the start of boiling-up operation in out of hot water, to an arbitrary value, and the start of a heating means 14 is controlled on the basis of the start hot water remaining quantity set by the hot water remaining quantity setting means 38 and the hot water remaining quantity calculated by the hot water remaining quantity calculating means 31. <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. The thing which performed the boiling operation for supplementing the insufficient amount of hot water is proposed (for example, refer 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 hot water boiling operation. For this reason, since the hot water storage tank is in a hot water storage form that is almost always boiling, only a small amount of water that should be boiled in the hot water tank is left in the midnight hours when the power charge is cheap. The ratio of boiling during the high daytime hours increases, causing the problem of increased running costs.

  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. By changing the amount of remaining hot water at the start of boiling in the belt, the necessary minimum amount of water is secured even when the hot water storage tank is downsized, and the ratio of boiling is reduced during the daytime hours when electricity charges are high. The purpose is to reduce the cost.

  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, comprising: a remaining hot water amount setting means for setting a stop remaining hot water amount for determining stoppage of the hot water boiling operation to an arbitrary value by time, and a stop remaining amount set by the remaining hot water amount setting means The amount of hot water and the remaining hot water Based on the calculated by the calculation means remaining hot water is obtained to perform the activation control of the heating means.

  According to the above invention, the amount of remaining hot water is set as a stop condition for the hot water boiling operation performed during the daytime period, and the amount of the remaining hot water is arbitrarily set according to the time in the time zone during which the hot water boiling operation is performed. Therefore, even if the hot water storage tank is downsized in order to reduce the installation space and initial cost, it is possible to secure 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 secure the necessary amount of hot water beforehand in response to the hot water filling operation that uses a large amount of hot water. In addition, the hot water boiling operation after the hot water filling operation can be solved by starting the hot water boiling operation at an early stage during the hot water filling operation. In other words, boiling during the daytime power supply time is minimized to prevent running out of hot water, and water that should be boiled during the midnight hours can be secured in the hot water storage tank, thus minimizing the running cost increase. Can do. 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, since the amount of remaining hot water that is a stop condition for the hot water boiling operation performed during the daytime period is set by changing according to time, the amount of hot water used even when the hot water storage tank is downsized. Boiling operation that secures the optimal amount of remaining hot water according to the form can be realized, there is no hot water phenomenon, and the boiling rate is low during the daytime hours when electricity charges are high, and the hot water storage type hot water supply has low running costs. An apparatus can be provided.

  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 is provided with 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. A remaining hot water amount setting means for setting the remaining hot water amount for determining stoppage of the hot water boiling operation to an arbitrary value by time, the remaining hot water amount set by the remaining hot water amount setting means and the remaining hot water amount Calculated by the calculation means It is characterized in that to perform the activation control of the heating means on the basis of the remaining hot water.

  Then, set the amount of remaining hot water as a stop condition for the hot water boiling operation performed during the daytime hours, and set this stopped residual hot water amount to an arbitrary value for each time in the time zone during which the hot water boiling operation is performed. 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 remaining hot water according to the daily hot water usage, Efficient boiling operation can be ensured without performing wasteful hot water boiling operation, and the necessary amount of hot water can be secured in advance in response to hot water filling operation using a large amount of hot water. At the same time, the hot water boiling operation after the hot water filling operation can be solved by starting the hot water boiling operation during the hot water filling operation early. In other words, boiling during the daytime power supply time is minimized to prevent running out of hot water, and water that should be boiled during the midnight hours can be secured in the hot water storage tank, thus minimizing the running cost increase. Can do. 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.

  The second aspect of the invention is a configuration in which the remaining hot water amount setting means is capable of setting the stop remaining hot water amount in units of at least one hour, and can be set to any value in a time zone excluding the total amount boiling operation time zone. It is characterized by that.

  And it shall be the composition which can set up the amount of stop hot water which judges stop condition when hot water boiling operation is started finely every hour, and secure the minimum amount of hot water required according to the actual use Thus, the boiling operation is performed efficiently. For example, in the time zone from the morning to the evening when the amount of hot water used is small, the amount of remaining hot water, which is the stop condition of the hot water boiling operation, is gradually increased every hour, and in a predetermined time zone including the bath hot water time zone By setting it to the maximum value, the amount of hot water required for bathing can be secured just before the bathing operation is started, and it can be stored in a small amount of time when there is little use of hot water before bathing. The required amount of hot water can be effectively secured while suppressing the useless boiling operation.

  The third aspect of the invention is characterized in that the remaining hot water amount setting means is set so that the amount of remaining hot water in the stop is maximized in a daytime time zone including a time zone in which a hot water filling operation is performed.

  In addition, the amount of hot water required for hot water filling operation is secured by setting the amount of remaining hot water that is the stop condition of hot water boiling operation to the maximum value during the time when hot water bathing operation is performed. In addition, it is possible to eliminate the hot water phenomenon after the hot water filling operation by reliably performing the hot water boiling operation during the hot water filling operation.

  In a fourth 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, and the capacity of the compressor is higher during boiling water boiling operation than during full boiling operation. It is characterized by raising.

  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.

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

  FIG. 1 is a block 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 whole 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. In addition, in the time zone excluding the total boiling-up operation time zone, the start remaining hot water amount and the stop remaining hot water amount are configured to be set in units of at least one hour, and by setting them to arbitrary values according to the actual usage conditions, It is possible to easily set a time zone in which it is difficult to enter the hot water boiling operation and a time zone in which the hot water boiling operation is easy.

  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. To determine whether it is necessary to start the hot water boiling operation or to stop the hot water boiling operation, and send a signal to the hot water temperature / capacity level changing means 33 and the boiling operation control means 34. Output. 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 that for the whole boiling operation, and performs the hot water boiling operation. In this 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. 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 is increased by the above boiling operation, and the remaining hot water amount calculating means 31 indicates that the remaining hot water temperature detector 7 corresponding to the set value of the stopped remaining hot water amount set by the remaining hot water amount setting means 38 exceeds the set temperature. If detected, 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 determined whether or not the amount of remaining hot water set for each time zone 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 is lower than the amount of remaining hot water, the hot water temperature / capability level changing means 33 causes the capacity of the compressor 10 to be higher than the capacity (for example, 4.5 kW) at the time of full-boiling operation. The capacity (for example, 9 kW) is changed (step 5), and the hot water boiling operation is performed (step 6).

  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 7).

  If the amount of remaining hot water in the tank does not exceed the amount of remaining hot water in step 7, the hot water boiling operation is continued (step 6). If it is determined in step 7 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 8).

  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 9).

  When it is determined in step 9 that it is a peak shift time zone, the amount of remaining hot water is calculated from the detected temperatures of 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 10).

  In step 10, if the amount of remaining hot water in the tank is not less than the amount of remaining hot water, monitoring of the remaining hot water is continued (step 11). In step 10, when the amount of remaining hot water in the tank falls below the amount of remaining hot water, the hot water temperature / capacity level changing means 33 causes the capacity of the compressor 10 to be higher than the capacity during full boiling operation (for example, 4.5 kW). The capacity is changed (for example, 9 kW) (step 12), and a hot water boiling operation is performed (step 13).

  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 14).

  If the tank remaining hot water amount does not exceed the stop remaining hot water amount in step 14, the hot water boiling operation is continued (step 13). If it is determined in step 14 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 15).

  If it is determined in step 9 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 the predetermined temperature at the end of the second predetermined time zone (step 16). ).

  If it is determined in step 16 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 17). If it is determined in step 16 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 18).

  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 The figure which shows the control flow 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 (5)

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,
A remaining hot water amount setting means for setting a stop remaining hot water amount for determining stoppage of the hot water boiling operation to an arbitrary value by time,
A hot water storage type hot water supply apparatus configured to perform stop control of the heating unit based on the amount of remaining hot water set by the remaining hot water amount setting unit and the amount of remaining hot water calculated by the remaining hot water amount calculating unit. The remaining hot water amount setting means is configured to be capable of setting the stopped remaining hot water amount in units of at least one hour, and configured to be able to be set to an arbitrary value in a time zone excluding the total amount boiling operation time zone. Hot water storage system. 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 during the daytime including the time zone during which the bath hot water filling operation is performed is maximized. 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 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 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 4.