JP7064937B2 - Hot water supply system - Google Patents

Description

The technique disclosed herein relates to a hot water supply system.

Patent Document 1 provides a heat pump for heating water, a tank for storing water, a circulation path for sending water from the lower part of the tank to the heat pump, and a circulation path for sending water from the heat pump to the upper part of the tank. A hot water supply system equipped with a circulation pump that circulates water between the heat pump and the tank, a hot water supply channel that sends water from the upper part of the tank to the hot water supply point, a water supply channel that sends water from the water supply source to the lower part of the tank, and a control device is disclosed. Has been done. The hot water supply system can perform a boiling operation in which water is heated by a heat pump while driving a circulation pump to circulate water between the tank and the heat pump. The control device is configured to perform a boiling operation based on the actual amount of hot water used for each time zone in the past predetermined period.

Japanese Unexamined Patent Publication No. 2013-224762

In general, by setting the boiling temperature low in the boiling operation, the COP of the heat pump can be increased and the energy efficiency of the hot water supply system can be improved. Therefore, from the viewpoint of energy efficiency, it is preferable to set the boiling temperature in the boiling operation as low as possible. However, if the boiling operation is always performed with the boiling temperature set low, the amount of heat stored in the tank is expected to be large when a large amount of hot water is used in a short time, for example, when hot water is poured into a bathtub. May run short. The present specification provides a technique capable of increasing the energy efficiency of a hot water supply system while preventing a situation in which the amount of heat stored in the tank is insufficient.

The hot water supply system disclosed in the present specification is provided in a heat pump for heating water, a tank for storing water, a circulation path for sending water from the lower part of the tank to the heat pump, and a circulation path for sending water from the heat pump to the upper part of the tank. It is equipped with a circulation pump that circulates water between the heat pump and the tank, a hot water supply channel that sends water from the top of the tank to the hot water supply point, a water supply channel that sends water from the water supply source to the bottom of the tank, and a control device. ing. The hot water supply system can perform a boiling operation in which the water is heated by the heat pump while driving the circulation pump to circulate the water between the tank and the heat pump. The control device is configured to estimate the amount of hot water used for each time zone of the day based on the actual amount of hot water used for each time zone in the past predetermined period. The control device is configured to perform a boiling operation according to the amount of hot water used for each estimated time zone. The control device is configured to set a higher boiling temperature than the normal boiling operation in the boiling operation performed in preparation for the time zone when the estimated hot water usage amount is large. In the boiling operation performed in preparation for the time when the estimated amount of hot water used is large, the control device boils the normal boiling amount of water at the boiling temperature in the normal boiling operation, and then performs the normal boiling operation. It is configured to boil a high temperature boiling amount of water at a higher boiling temperature. The normal boiling amount and the high temperature boiling amount match the capacity of the tank when summed up.

In the above hot water supply system, the hot water supply usage for each time zone of the day is estimated based on the past results, and the boiling temperature is set high in the boiling operation performed in preparation for the time zone when the estimated hot water supply usage is large. do. With such a configuration, it is possible to prevent a situation in which the heat storage amount of the tank is insufficient in a time zone in which a large amount of hot water supply is expected to be used in a short time, for example, when hot water is poured into a bathtub. Further, in the above-mentioned hot water supply system, the boiling temperature is set low in the normal boiling operation other than the boiling operation performed in preparation for the time zone when the estimated hot water usage amount is large. With such a configuration, the heat pump can be operated at a high COP, and the energy efficiency of the hot water supply system can be improved. According to the above-mentioned hot water supply system, it is possible to improve the energy efficiency of the hot water supply system while preventing the situation where the heat storage amount of the tank is insufficient.

For example, when a shower is used after hot water is poured into a bathtub, a large amount of hot water may be supplied in a short time, and then normal hot water may be supplied. In such a case, it is preferable to set a high boiling temperature in order to increase the amount of heat stored in the tank for hot water supply that is performed in a large amount in a short time, but for normal hot water supply after that, it is preferable to set it to a high boiling temperature. It is preferable to keep the boiling temperature low in order to increase the COP of the heat pump. In the above hot water supply system, in the boiling operation performed in preparation for the time when the estimated hot water usage amount is large, after boiling the normal boiling amount of water at the boiling temperature in the normal boiling operation, the normal boiling is performed. By boiling a high temperature boiling amount of water at a higher boiling temperature than the raising operation, the water heated at a high boiling temperature is placed in the tank on a layer of water heated at a low boiling temperature. A temperature stratification is formed in which the layers are laminated. With such a configuration, it is possible to increase the ratio of operating the heat pump at a low boiling temperature while ensuring the amount of heat stored in the tank for hot water supply that is performed in large quantities in a short time, improving energy efficiency. can do.

The hot water supply system described above may further include a temperature sensor that detects the temperature of the water at the top of the tank. When the control device performs the boiling operation at a higher boiling temperature than the normal boiling operation and then performs the normal boiling operation again, the boiling temperature in the boiling operation is set to the temperature of the water at the top of the tank. It may be configured to be set to a higher temperature .

According to the above-mentioned hot water supply system, when the boiling operation is performed at a high boiling temperature and then the normal boiling operation is performed again , a layer of hot water remains inside the tank. However, the necessary boiling operation can be performed without breaking the temperature stratification in the tank.

The figure which shows typically the structure of the hot water supply device 2 of an Example. It is a flowchart explaining the setting process performed by the control unit 70 of the hot water supply device 2 of an embodiment. It is a flowchart explaining the high temperature boiling operation process performed by the control unit 70 of the hot water supply device 2 of an Example. It is a flowchart explaining the normal boiling operation process performed by the control unit 70 of the hot water supply device 2 of an Example.

As shown in FIG. 1, the hot water supply device 2 includes a tank 10, a tank water circulation path 20, a tap water introduction path 30, a supply path 40, a heat pump 50, a combustion device 60, a control unit 70, and a remote controller 80. To prepare for.

The heat pump 50 is a heat source machine that absorbs heat from the outside air, which is a natural environment, to heat the water in the tank water circulation path 20. Although not shown, the heat pump 50 includes a refrigerant circulation path that circulates a refrigerant (alternative freon or a natural refrigerant such as R410A, propane, CO ₂ , etc.), an evaporator that exchanges heat between the outside air and the refrigerant, and a refrigerant. A compressor that compresses to high temperature and high pressure, a condenser that exchanges heat between the water in the tank water circulation path 20 and the high temperature and high pressure refrigerant, and a low temperature and low pressure refrigerant after heat exchange is completed. It is equipped with an expansion valve.

The tank 10 stores hot water heated by the heat pump 50. The tank 10 is a closed type, and the outside is covered with a heat insulating material. Water is stored in the tank 10 until it is full. In this embodiment, the capacity of the tank 10 is 160 L. A thermistor 11 is attached to the top of the tank 10. Further, thermistors 12, 14, 16 and 18 are attached to the tank 10 at positions 12L, 30L, 50L and 80L from the upper part of the tank 10, respectively. Each thermistor 11, 12, 14, 16, 18 measures the temperature of the water at its mounting position.

The tank water circulation path 20 has an upstream end connected to the lower part of the tank 10 and a downstream end connected to the upper part of the tank 10. A circulation pump 22 is interposed in the tank water circulation passage 20. The circulation pump 22 sends out the water in the tank water circulation path 20 from the upstream side to the downstream side. Further, the tank water circulation path 20 passes through the condenser of the heat pump 50. Therefore, when the heat pump 50 is operated, the water in the tank water circulation path 20 is heated by the condenser of the heat pump 50. Therefore, when the circulation pump 22 and the heat pump 50 are operated, the water in the lower part of the tank 10 is sent to the heat pump 50 to be heated, and the water heated by the heat pump 50 is returned to the upper part of the tank 10. Further, a thermistor 24 is interposed on the upstream side of the heat pump 50 of the tank water circulation path 20. The thermistor 24 is derived from the lower part of the tank 10 and measures the temperature of water before passing through the heat pump 50. The thermistor 24 may be provided in the tank water circulation path 20 located closer to the heat pump 50 than the circulation pump 22, or may be provided in the tank water circulation path 20 located closer to the tank 10 than the circulation pump 22. ..

The tap water introduction path 30 is connected to a tap water supply source 31 whose upstream end is a water supply source. A thermistor 32 is interposed in the tap water introduction path 30. The thermistor 32 measures the temperature of tap water. The downstream side of the tap water introduction path 30 is branched into a first introduction path 30a and a second introduction path 30b. The downstream end of the first introduction path 30a is connected to the lower part of the tank 10. The downstream end of the second introduction path 30b is connected in the middle of the supply path 40. A mixing valve 42 is provided at a connection portion between the downstream end of the second introduction path 30b and the supply path 40. The mixing valve 42 adjusts the amount of water in the second introduction path 30b to be mixed with the hot water flowing in the supply path 40.

The upstream end of the supply path 40 is connected to the upper part of the tank 10. A thermistor 41 is interposed in the supply path 40 on the upstream side of the connection portion with the second introduction path 30b. The thermistor 41 measures the temperature of the water supplied from the tank 10 to the supply path 40. A combustion device 60 is interposed in the supply path 40 on the downstream side of the connection portion with the second introduction path 30b. Further, a thermistor 44 is interposed in the supply path 40 on the downstream side of the combustion device 60. The thermistor 44 measures the temperature of water after passing through the combustion device 60. The combustion device 60 heats water by burning fuel gas. The combustion device 60 heats the water in the supply path 40 so that the temperature of the water measured by the thermistor 44 matches the set temperature of the hot water supply. The downstream end of the supply path 40 is connected to, for example, a faucet in the kitchen, a shower 54 in the bathroom 48, a faucet 56, and the like. Further, at the downstream end of the supply path 40, a hot water beam valve 46 for hot water filling the bathtub 58 of the bathroom 48 is provided. The hot water valve 46 can adjust the flow rate of hot water supplied to the bathtub 58 by adjusting the opening degree. In the present specification, the faucet of the kitchen, the shower 54 and the faucet 56 of the bathroom 48, and the bathtub 58 to which hot water is supplied from the supply channel 40 are collectively referred to as a hot water supply location.

The control unit 70 includes a CPU, ROM, RAM, etc. (not shown). The control unit 70 is electrically connected to each component of the hot water supply device 2 and controls the operation of each component. A remote controller 80 is connected to the control unit 70. The remote controller 80 includes a CPU, ROM, RAM, etc. (not shown). Further, the remote controller 80 includes a display unit 80a for displaying various information related to the hot water supply device 2, and an operation unit 80b for receiving various operation inputs related to the hot water supply device 2. The user can set the hot water supply set temperature, which is the temperature of the water supplied to the shower 54, the faucet 56, the bathtub 58, etc., via the remote controller 80. Further, the user can instruct the start of hot water filling to the bathtub 58 via the remote controller 80.

Next, the operation of the hot water supply device 2 will be described. The hot water supply device 2 can perform a boiling operation, a hot water supply operation, and a hot water beam operation. In this specification, both the hot water supply operation and the hot water beam operation of the hot water supply device 2 are referred to as hot water supply by the hot water supply device 2. Hereinafter, each operation will be described.

(Boiling operation)
The boiling operation is an operation in which the water in the tank 10 is heated by the heat pump 50. When the control unit 70 instructs the execution of the boiling operation, the heat pump 50 operates and the circulation pump 22 operates. When the circulation pump 22 operates, the water in the tank 10 circulates in the tank water circulation path 20. That is, the water existing in the lower part of the tank 10 is introduced into the tank water circulation path 20, and when the introduced water passes through the condenser of the heat pump 50, it is heated by the heat of the refrigerant, and the heated water is heated by the tank 10. Returned to the top of. In the boiling operation, the control unit 70 controls the operation of the heat pump 50 and the circulation pump 22 so that the temperature of the water heated by the heat pump 50 matches the boiling set temperature. As a result, the water that has been boiled up to the set temperature is returned to the upper part of the tank 10. Inside the tank 10, a temperature stratification is formed in which a layer of high temperature water is laminated on a layer of low temperature water.

(Hot water supply operation)
The hot water supply operation is an operation of supplying the water in the tank 10 to the hot water supply location. The hot water supply operation can also be executed during the above-mentioned boiling operation. When the hot water tap is opened at the hot water supply location, tap water flows from the tap water introduction path 30 (first introduction path 30a) to the lower part of the tank 10 due to the water pressure from the tap water supply source 31. At the same time, the hot water in the upper part of the tank 10 is supplied to the hot water supply point via the supply path 40.

When the temperature of the water supplied from the tank 10 to the supply path 40 (that is, the measured temperature of the thermistor 41) is higher than the hot water supply set temperature, the control unit 70 opens the mixing valve 42 and starts from the second introduction path 30b. Tap water is introduced into the supply channel 40. Therefore, the water supplied from the tank 10 and the tap water supplied from the second introduction path 30b are mixed in the supply path 40. The control unit 70 adjusts the opening degree of the mixing valve 42 so that the temperature of the water supplied to the hot water supply location matches the hot water supply set temperature. On the other hand, the control unit 70 operates the combustion device 60 when the temperature of the water supplied from the tank 10 to the supply path 40 is lower than the hot water supply set temperature. Therefore, the water passing through the supply path 40 is heated by the combustion device 60. The control unit 70 controls the output of the combustion device 60 so that the temperature of the water supplied to the hot water supply location matches the hot water supply set temperature.

(Hot water operation)
The hot water beam operation is an operation of supplying the water in the tank 10 to the bathtub 58. When the remote controller 80 instructs to start the hot water beam, the control unit 70 opens the hot water beam valve 46. As a result, water adjusted to the hot water supply set temperature is supplied to the bathtub 58 in the same manner as in the hot water supply operation.

(Learning control)
The control unit 70 stores the amount of hot water used indicating the amount of hot water used for hot water supply every hour. The control unit 70 stores the amount of hot water supplied every hour for each day of the past predetermined period (for example, 7 days) as the hot water supply record of the hot water supply device 2.

The control unit 70 performs the setting process shown in FIG. 2 every day every time the current time reaches the reference time (for example, 2:00).

In step S2, the control unit 70 estimates the hourly hot water supply usage amount expected on the day as the predicted hot water output amount Qm1 to Qm24 based on the hot water supply results up to the previous day. For example, Qm1 is the predicted amount of hot water discharged from 2:00 to 3:00, Qm2 is the predicted amount of hot water discharged from 3:00 to 4:00, and Qm24 is the predicted amount of hot water discharged from 1:00 to 2:00. It is the predicted amount of hot water.

In step S4, the control unit 70 has a time zone (normal time zone) that can be handled by the boiling operation of the normal boiling temperature and a boiling operation of the high temperature boiling temperature based on the predicted hot water discharge amount Qm1 to Qm24. Identify the time zone (high temperature time zone) that needs to be dealt with in. For example, the control unit 70 boiled the tank 10 to full capacity (for example, 160 L) at a normal boiling temperature (for example, 65 ° C.), and then supplied hot water with a predicted hot water output amount of Qm1 to Qm24 at a hot water supply set temperature (for example, 40 ° C.). When the minimum heat storage amount (for example, the heat storage amount capable of supplying a predetermined amount (for example, 50 L) of hot water at the hot water supply set temperature (for example, 40 ° C.)) cannot be secured as the heat storage amount of the tank 10. The time zone corresponding to the amount of hot water discharged Qm1 to Qm24 is specified as a high temperature time zone, and the other time zones are specified as normal time zones. For example, the control unit 70 specifies a time zone corresponding to the predicted hot water discharge amount Qm16 (for example, from 18:00 to 19:00) as a high temperature time zone, and the predicted hot water discharge amount Qm1 to Qm15 and Qm17 to Qm24 (for example, 2). (From 0:00 to 18:00 and from 19:00 to 2:00) is specified as a normal time zone.

In step S6, the control unit 70 specifies the boiling temperature (high temperature boiling temperature) of the boiling operation performed in preparation for the high temperature time zone. For example, the control unit 70 sets a temperature (for example, 70 ° C.) higher than the normal boiling temperature (for example, 65 ° C.) by a predetermined temperature range (for example, 5 ° C.) as the determination boiling temperature. Then, the control unit 70 boiled the tank 10 to full capacity (for example, 160 L) at the determination boiling temperature, and then supplied the predicted hot water amount (for example, Qm16) at the hot water supply set temperature (for example, 40 ° C.). In this case, it is determined whether or not the minimum heat storage amount can be secured as the heat storage amount of the tank 10. In the above case, if the minimum heat storage amount can be secured as the heat storage amount of the tank 10, the control unit 70 sets the determination boiling temperature as the high temperature boiling temperature. In the above case, when the minimum heat storage amount cannot be secured as the heat storage amount of the tank 10, the control unit 70 raises the determination boiling temperature (for example, 70 ° C.) by a predetermined temperature range (for example, 5 ° C.) higher (for example, 75 ° C.). ), And then perform the above judgment again. The control unit 70 repeats the above process to specify the high temperature boiling temperature (for example, 85 ° C.).

In step S8, the control unit 70 has a boiling amount (high temperature boiling amount) at a high temperature boiling temperature (for example, 85 ° C.) and a normal boiling temperature (for example, for example) with respect to the boiling operation performed in preparation for the high temperature time zone. The boiling amount (normal boiling amount) at 65 ° C.) is specified. The high-temperature boiling amount and the normal boiling amount match the capacity of the tank 10 (for example, 160 L) when totaled. When the control unit 70 performs the boiling operation of the normal boiling amount at the normal boiling temperature (for example, 65 ° C.) and the boiling operation of the high temperature boiling amount at the high temperature boiling temperature (for example, 85 ° C.). In addition, the high temperature boiling amount and the normal boiling amount are specified so that the minimum heat storage amount can be secured as the heat storage amount of the tank 10 after the hot water supply of the predicted hot water discharge amount (for example, Qm16) in the high temperature time zone is performed.

In step S10, the control unit 70 specifies the start time of the boiling operation on the day. For example, the control unit 70 performs a boiling operation in preparation for the predicted hot water discharge amount Qm1 to Qm15 corresponding to the time zone before the high temperature time zone and a boiling operation performed in preparation for the predicted hot water discharge amount Qm16 corresponding to the high temperature time zone. And, regarding the boiling operation to prepare for the predicted hot water discharge amount Qm17 to Qm24 corresponding to the time zone after the high temperature time zone, the boiling operation is completed by the time when the first hot water supply in each time zone is started. , Specify the start time of boiling operation.

After the processing of FIG. 2 is completed, the control unit 70 executes the processing shown in FIG. 3 or FIG. 4 when the set start time of the boiling operation arrives. The control unit 70 executes the high-temperature boiling operation process shown in FIG. 3 when the start time of the boiling operation to be performed in preparation for the high-temperature time zone arrives, and when the start time of the other boiling operations arrives, FIG. 4 The normal boiling operation process shown in is executed.

(High temperature boiling operation process)
Hereinafter, the high temperature boiling operation process performed by the control unit 70 will be described with reference to FIG.

In step S22, the control unit 70 sets the boiling set temperature to the normal boiling temperature (for example, 65 ° C.).

In step S24, the control unit 70 starts the boiling operation. As a result, water heated to a normal boiling temperature (for example, 65 ° C.) is stored in the upper part of the tank 10.

In step S26, the control unit 70 waits until the boiling amount in the boiling operation after step S24 reaches the normal boiling amount. The boiling amount in the boiling operation can be calculated, for example, based on the rotation speed of the circulation pump 22 and the duration of the boiling operation. When the boiling amount reaches the normal boiling amount in step S26 (YES), the process proceeds to step S28.

In step S28, the control unit 70 changes the boiling set temperature from the normal boiling temperature (for example, 65 ° C.) to the high temperature boiling temperature (for example, 85 ° C.). As a result, in the upper part of the tank 10, water heated to a high temperature boiling temperature (for example, 85 ° C.) is stored above the water heated to a normal boiling temperature (for example, 65 ° C.).

In step S30, the control unit 70 waits until the boiling amount in the boiling operation after step S28 reaches the high temperature boiling amount. When the boiling amount reaches the high temperature boiling amount in step S30 (YES), the process proceeds to step S32.

In step S32, the control unit 70 ends the boiling operation.

By executing the high temperature boiling operation process shown in FIG. 3, the inside of the tank 10 is filled with high temperature (for example, 85 ° C.) water on a layer of low temperature (for example, 65 ° C.) water as shown in FIG. A temperature stratification is formed in which the layers of the above are laminated. As a result, it is possible to increase the ratio of operating the heat pump 50 at a low boiling temperature while ensuring a sufficient amount of heat storage in the tank 10 for a large amount of hot water supply (for example, predicted hot water output amount Qm16) performed in a short time. Energy efficiency can be improved.

(Normal boiling operation process)
Hereinafter, the normal boiling operation process performed by the control unit 70 will be described with reference to FIG. 4.

In step S42, the control unit 70 acquires the temperature of the water above the tank 10 (tank upper temperature) detected by the thermistor 11.

In step S44, the control unit 70 determines whether or not the tank upper temperature is below the normal boiling temperature (for example, 65 ° C.).

In step S44, when the tank upper temperature is below the normal boiling temperature (for example, 65 ° C.) (YES), the process proceeds to step S46. In step S46, the control unit 70 sets the boiling set temperature to the normal boiling temperature (for example, 65 ° C.). After step S46, the process proceeds to step S50.

In step S44, when the tank upper temperature exceeds the normal boiling temperature (for example, 65 ° C.) (NO), the process proceeds to step S48. In step S48, the control unit 70 sets the boiling set temperature to a temperature obtained by adding a predetermined temperature range (for example, 1 ° C.) to the tank upper temperature. As a result, the subsequent boiling operation can be performed without destroying the temperature stratification inside the tank 10. After step S48, the process proceeds to step S50.

In step S50, the control unit 70 starts the boiling operation. As a result, the water heated to the boiling set temperature set in step S46 or step S48 is stored in the upper part of the tank 10.

Normally, by executing the boiling operation, the amount of water heated to the boiling set temperature gradually increases in the upper part of the tank 10. However, the temperature of the water in the upper part of the tank 10 may decrease due to the hot water supply operation during the boiling operation. Therefore, even after the boiling operation is started in step S50, the control unit 70 updates the boiling set temperature by the processing after step S52.

In step S52, the control unit 70 acquires the temperature of the water above the tank 10 (tank upper temperature) detected by the thermistor 11.

In step S54, the control unit 70 determines whether or not the tank upper temperature is below the normal boiling temperature (for example, 65 ° C.).

In step S54, when the tank upper temperature is below the normal boiling temperature (for example, 65 ° C.) (YES), the process proceeds to step S56. In step S56, the control unit 70 sets the boiling set temperature to the normal boiling temperature (for example, 65 ° C.). After step S56, the process proceeds to step S60.

In step S54, when the tank upper temperature exceeds the normal boiling temperature (for example, 65 ° C.) (NO), the process proceeds to step S58. In step S58, the control unit 70 sets the boiling set temperature to a temperature obtained by adding a predetermined temperature range (for example, 1 ° C.) to the tank upper temperature. As a result, the subsequent boiling operation can be performed without destroying the temperature stratification inside the tank 10. After step S58, the process proceeds to step S60.

In step S60, the control unit 70 specifies the boiling set amount. For example, in the case of the boiling operation provided for the predicted hot water discharge amount Qm17 to Qm24, the control unit 70 takes into consideration the boiling temperature and the boiling amount of the water already boiled after step S50, and then steps S56 or With the boiling set temperature set in step S58, the boiling amount that can cover the predicted hot water discharge amounts Qm17 to Qm24 is calculated and specified as the boiling set amount.

In step S62, the control unit 70 determines whether or not the boiling amount in the boiling operation after step S50 has reached the boiling set amount specified in step S60. If the boiling amount has not reached the boiling set amount in step S62 (NO), the process returns to step S52. When the boiling amount reaches the boiling set amount in step S62 (YES), the process proceeds to step S64.

In step S64, the control unit 70 ends the boiling operation.

In the normal boiling operation process shown in FIG. 4, the boiling operation is performed after the boiling operation is executed at a high boiling temperature (for example, after the high temperature boiling operation process of FIG. 3 is executed in preparation for the predicted hot water output amount Qm16). In the above, even when high temperature (for example, 85 ° C.) water remains in the upper part of the tank 10, the necessary boiling operation can be performed without breaking the temperature stratification inside the tank 10.

Although the examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of claims. The techniques described in the claims include various modifications and modifications of the specific examples exemplified above.

The technical elements described herein or in the drawings exhibit their technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the techniques exemplified in the present specification or the drawings can achieve a plurality of purposes at the same time, and achieving one of the purposes itself has technical usefulness.

2: Hot water supply device 10: Tank 11: Thermistor 12: Thermistor 14: Thermistor 16: Thermistor 18: Thermistor 20: Tank water circulation path 22: Circulation pump 24: Thermistor 30: Tap water introduction path 30a: First introduction path 30b: Second Introduction path 31: Tap water supply source 32: Thermistor 40: Supply path 41: Thermistor 42: Mixing valve 44: Thermistor 46: Hot water valve 48: Bathroom 50: Heat pump 54: Shower 56: Curran 58: Bathtub 60: Combustion device 70 : Control unit 80: Remote control 80a: Display unit 80b: Operation unit

Claims (2)

A heat pump that heats water,
A tank for storing water and
A circulation path that sends water from the bottom of the tank to the heat pump and water from the heat pump to the top of the tank.
A circulation pump that is installed in the circulation path and circulates water between the heat pump and the tank,
A hot water supply channel that sends water from the top of the tank to the hot water supply point,
A water supply channel that sends water from the water source to the bottom of the tank,
Equipped with a control device
It is possible to carry out a boiling operation in which the water is heated by the heat pump while driving the circulation pump to circulate the water between the tank and the heat pump.
The control device is configured to estimate the amount of hot water used for each time zone of the day based on the actual amount of hot water used for each time zone in the past predetermined period.
The control device is configured to perform a boiling operation according to the estimated amount of hot water used for each time zone.
The control device is configured to set a higher boiling temperature than the normal boiling operation in the boiling operation performed in preparation for the time zone when the estimated hot water usage amount is large .
In the boiling operation performed in preparation for the time when the estimated amount of hot water used is large, the control device boils the normal boiling amount of water at the boiling temperature in the normal boiling operation, and then performs the normal boiling operation. It is configured to boil a high temperature boiling amount of water at a higher boiling temperature.
A hot water supply system in which the normal boiling amount and the high temperature boiling amount match the capacity of the tank when summed up . It also has a temperature sensor that detects the temperature of the water at the top of the tank.
When the control device performs the boiling operation at a higher boiling temperature than the normal boiling operation and then performs the normal boiling operation again, the boiling temperature in the boiling operation is set to the temperature of the water at the top of the tank. The hot water supply system of claim 1, which is configured to be set to a higher temperature.

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