JP7293571B2 - Control method for storage hot water supply device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method of controlling a storage hot water supply apparatus, and more particularly to a control method of a storage hot water supply apparatus having a function of supplying heated hot water for use other than hot water supply.

2. Description of the Related Art Conventionally, there has been widely used a hot water storage hot water supply apparatus that uses hot water stored in a hot water storage tank for hot water supply by a hot water storage operation in which a heat source machine heats and stores hot water in the hot water storage tank. Such a hot water storage hot water supply apparatus includes an auxiliary heat source device and a pump for heating operation for heating hot water and tap water in the hot water storage tank when there is no hot water at a temperature that can be used for hot water supply, and the pump is heated by the heating operation. Hot water can be used for hot water supply.

In addition, the hot water storage and hot water supply device is equipped with mixing means such as a mixing valve and a mixing device, and the mixing means mixes high temperature water (hot water stored in hot water storage operation or hot water heated in heating operation) and low temperature water (clean water). A hot water supply operation is performed in which hot water adjusted to the hot water supply set temperature by adjusting the ratio is supplied to the hot water supply pipe. The hot water supply operation is started when a hot water supply valve or the like connected to the hot water supply pipe is opened, and the hot water supply operation is stopped when the hot water supply valve or the like is closed to enter a hot water supply standby state until the next hot water supply operation is started.

The hot water storage hot water supply apparatus in the hot water supply standby state adjusts the mixing ratio of the mixing means according to the hot water temperature of the high temperature water inlet of the mixing means until a predetermined waiting time elapses after the hot water supply operation is stopped. Since the mixture ratio is adjusted according to the temperature of hot water in the pipe of the high-temperature water inlet that decreases with the lapse of time, it is possible to quickly supply hot water at the hot water supply set temperature when the hot water supply operation is started next time. However, if high-temperature hot water is stored while waiting for hot water supply, when hot water supply operation is started next time, hot water whose temperature has decreased in the pipe is supplied, and then newly stored high-temperature hot water is supplied to the mixing means. Therefore, there is a problem that hot water having a higher temperature than the hot water supply set temperature is supplied because the mixture ratio is not adjusted in time.

In order to solve such a problem, for example, the hot water supply system of Patent Document 1 has a mixing unit based on the temperature of the hot water in the hot water storage tank and the set hot water supply temperature, or based on the temperature of the hot water flowing into the hot water storage tank and the set hot water supply temperature. By adjusting the mixture ratio by adjusting the opening degree of the regulating valve in the , it is possible to prevent hot water supply at a temperature higher than the hot water supply set temperature when hot water supply is restarted.

Japanese Patent No. 4906464

Some hot water storage and hot water supply devices have not only the hot water supply function described above, but also a hot water utilization function other than hot water supply, in which hot water heated by a heating operation using an auxiliary heat source is used for heating or reheating a bath. In the hot water supply system of Patent Document 1, the hot water used in the hot water use function and the hot water heated by the auxiliary heat source device for hot water supply flow into the hot water storage tank, and the mixing ratio is adjusted based on the temperature of the hot water in the hot water storage tank. to prevent hot water supply at a temperature higher than the set hot water supply temperature.

In the hot water supply system of Patent Document 1, the hot water heated by the auxiliary heat source machine is mixed with the hot water in the hot water storage tank before being supplied to the mixing unit. It becomes difficult to quickly supply hot water at the hot water supply set temperature. Further, when the hot water use function is used, the temperature stratification of the hot water formed in the hot water storage tank by the hot water storage operation is broken by the hot water used in the hot water use function, which is not preferable.

Therefore, the hot water heated by the auxiliary heat source machine is directly supplied to the mixing means, and the piping is arranged so that the hot water used in the hot water utilization function is circulated without flowing into the hot water storage tank. However, if the hot water supply operation is started while the hot water use function is being used during hot water supply standby, hot water for the hot water use function may be supplied to the mixing means. Even if the mixing ratio is adjusted according to the temperature of the hot water in the tank, there is a possibility that the hot water is supplied at a temperature higher than the hot water supply set temperature.

SUMMARY OF THE INVENTION An object of the present invention is to provide a control method for a storage hot water supply apparatus capable of preventing the supply of hot water at a temperature higher than the hot water supply set temperature when the hot water supply operation is started while the hot water utilization function is being used during hot water supply standby. .

A method for controlling a hot water storage and hot water supply apparatus according to a first aspect of the invention includes a hot water storage tank for storing hot water, a heat source device for circulating and heating the hot water in the hot water storage tank, a water supply pipe connected to the bottom of the hot water storage tank, a hot water supply pipe connected to the top of the hot water storage tank; a branch pipe of the water supply pipe; a mixing means to which the hot water supply pipe and the hot water supply pipe are connected; an auxiliary heating pipe connected to the hot water supply pipe; an auxiliary heat source device interposed in the auxiliary heating pipe; a pump interposed in the auxiliary heating pipe on the inlet side of the auxiliary heat source device; a flow regulating valve for adjusting the amount of hot water supplied to the hot water supply pipe from the hot water supply pipe; A hot water storage hot water supply apparatus having a utilization pipe, wherein the hot water supply set temperature is adjusted by adjusting the mixing ratio of the mixing means for mixing high temperature water supplied from the hot water supply pipe and low temperature water supplied from the branch pipe. hot water supply operation control for supplying hot water from the hot water supply pipe; In a method for controlling a hot water storage/hot water supply apparatus that performs hot water supply standby control for adjusting a mixture ratio, the hot water supply standby control includes executing a heating operation using the auxiliary heat source device to supply hot water to the hot water utilization pipe. hot water temperature in the hot water storage tank detected by the hot water temperature sensor, hot water temperature at the high temperature water inlet of the mixing means detected by the mixing valve high temperature water inlet temperature sensor, and temperature detected by the auxiliary heat source unit outlet temperature sensor. adjusting the mixing ratio of the mixing means in accordance with the hot water temperature on the outlet side of the auxiliary heat source machine which is detected by a flow rate control valve temperature sensor and the hot water temperature on the inlet side of the flow rate control valve detected by the flow rate control valve temperature sensor, which is the highest hot water temperature. is characterized by

According to the above configuration, the hot water storage/hot water supply apparatus having the function of using the hot water in the hot water use pipe executes the hot water supply operation control in which the hot water is adjusted to the hot water supply set temperature by the mixing means and hot water is supplied. Also, until the standby time elapses after the hot water supply operation control is stopped, hot water supply standby control is executed to adjust the mixing ratio according to the hot water temperature of the hot water inlet of the mixing means so as to supply hot water at the hot water supply set temperature. In this hot water supply standby control, a hot water storage temperature sensor, a mixing valve high temperature water inlet temperature sensor, and an auxiliary heat source machine outlet are set in a state in which a heating operation using the auxiliary heat source machine is executed to supply hot water to the hot water pipe. The mixing ratio of the mixing means is adjusted according to the highest temperature of hot water detected by the temperature sensor and the temperature sensor of the flow control valve .
Therefore, when the hot water supply operation is started during the hot water supply standby, even if the hot water of the highest temperature is supplied to the mixing means, the hot water supply at the hot water supply set temperature is ready. You can prevent hot water supply.

According to the control method of the hot water storage hot water supply apparatus of the present invention, it is possible to prevent hot water supply at a temperature higher than the hot water supply set temperature even if the hot water supply operation is started when the hot water utilization function is used during hot water supply standby.

1 is a configuration diagram of a hot water storage and hot water supply apparatus according to an embodiment of the present invention; FIG. 4 is a flow chart of hot water supply operation control of the hot water storage and hot water supply apparatus according to the embodiment of the present invention. 5 is a flowchart of hot water supply standby control of the hot water storage and hot water supply apparatus according to the embodiment of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated based on an Example.

As shown in FIG. 1, a hot water storage and hot water supply apparatus 1 includes a hot water storage tank 2 for storing hot water, a heat source device 3 for circulating and heating the hot water in the hot water storage tank 2, and a hot water supply device for adjusting the temperature. It has a heat source machine outgoing pipe 5 that supplies hot water from the hot water tank 2 to the heat source machine 3 and a heat source machine return pipe 6 that returns hot water from the heat source machine 3 to the hot water tank 2. A temperature sensor 5a for detecting the temperature of hot water introduced into the heat source device 3 is arranged in the heat source device outgoing pipe 5, and the heat source device return pipe 6 detects the temperature of the hot water heated by the heat source device 3. A heat source machine return temperature sensor 6a is provided. The heat source device 3 is, for example, a heat pump type heat source device, a fuel cell, or the like, which utilizes heat during power generation, and performs a hot water storage operation in which the hot water in the hot water storage tank 2 is heated to a temperature higher than the hot water supply set temperature and stored.

The hot water storage and hot water supply apparatus 1 also includes a water supply pipe 7 connected to the bottom of the hot water storage tank 2 for supplying clean water (low temperature water) to the hot water storage tank 2, and a hot water storage tank 2 for discharging hot water from the hot water storage tank 2. It has a hot water outlet pipe 8 connected to the top of the. The water supply pipe 7 is provided with a water supply temperature sensor 7a for detecting the temperature of the low-temperature water. A plurality of stored hot water temperature sensors 2a to 2e are arranged in the hot water storage tank 2 at predetermined intervals in the height direction thereof.

The mixing valve 4 is connected to a first branch pipe 9 (branch pipe) branched from the water supply pipe 7 , a hot water supply pipe 8 and a hot water supply pipe 10 . In the hot water supply operation in which hot water is supplied at the hot water supply set temperature, the hot water (high temperature water) supplied from the hot water supply pipe 8 and the low temperature water supplied from the first branch pipe 9 are mixed to adjust the hot water supply set temperature. Adjust the mixing ratio of 4. The hot water mixed by the mixing valve 4 is supplied to the hot water supply pipe 10 and supplied from the hot water tap 11 or the like. A hot water outlet pipe 8 near the hot water inlet of the mixing valve 4 is provided with a mixing valve high temperature water inlet temperature sensor 8 a for detecting the temperature of the high temperature water supplied to the mixing valve 4 . The hot water supply pipe 10 is provided with a hot water supply flow rate sensor 10a for detecting the hot water supply flow rate, a hot water supply temperature sensor 10b for detecting the hot water supply temperature, a hot water supply flow rate adjustment valve 10c for adjusting the hot water supply flow rate, and the like.

An auxiliary heating pipe 12 is branched from the hot water outlet pipe 8, and the auxiliary heating pipe 12 is connected to the hot water outlet pipe 8 on the mixing valve 4 side of the branched portion. An auxiliary heat source device 14 for heating hot water is interposed in the auxiliary heating pipe 12 . A pump 15 for supplying hot water to the auxiliary heat source device 14 is interposed in the auxiliary heating pipe 12 on the hot water inlet side of the auxiliary heat source device 14 . Further, an auxiliary heat source device outlet temperature sensor 12a for detecting the temperature of hot water heated by the auxiliary heat source device 14 is arranged in the auxiliary heating pipe 12 on the hot water outlet side of the auxiliary heat source device 14, and supplies hot water to the hot water outlet pipe 8. A flow control valve 16 is interposed for adjusting the amount of hot water. The flow control valve 16 is provided with a flow control valve temperature sensor 16a for detecting the temperature of the flowing hot water.

A hot water utilization pipe 18 is branched from the auxiliary heating pipe 12 on the hot water outlet side of the auxiliary heat source device 14 and upstream of the flow control valve 16 , and this hot water utilization pipe 18 is on the inlet side of the pump 15 . It is connected to the. A three-way valve 19 for switching between two paths (the auxiliary heating pipe 12 and the hot water utilization pipe 18) for supplying hot water to the auxiliary heat source device 14 is arranged at this connecting portion. The three-way valve 19 can also be adjusted so that hot water from both paths is mixed and supplied to the auxiliary heat source device 14 . The auxiliary heat source device 14 is, for example, a combustion type heat source device that heats hot water using combustion heat of fuel gas.

Hot water heated by a heating operation using the auxiliary heat source device 14 is supplied to the hot water utilization pipe 18 . The hot water use pipe 18 includes, for example, a heating heat exchanger 18a for exchanging heat between the hot water and the heating heat medium for the heating operation of heating the heating heat medium supplied to the heating equipment (not shown), and hot water for bathing. A bath reheating heat exchanger 18b for bath reheating operation for heating (reheating) the bath is provided. In addition, the hot water pipe 18 is provided with electromagnetic valves that open when using hot water other than hot water supply, such as a heating solenoid valve 18c that opens during heating operation and a bath reheating solenoid valve 18d that opens during bath reheating operation. A second branch pipe 20 branched from the water supply pipe 7 is connected to the hot water utilization pipe 18 on the downstream side of these electromagnetic valves.

The hot water storage and hot water supply apparatus 1 includes a control unit 21 for controlling the hot water supply operation and the like. The control unit 21 controls the operation of devices such as various valves and the pump 15 based on the temperature detected by the temperature sensors provided in each part such as the hot water storage temperature sensor 2a and the flow rate detected by the hot water supply flow rate sensor 10a. conduct. The control unit 21 also has a function such as a timekeeping function and a function of storing hot water supply usage history, etc., and is connected to an operation terminal 22 for performing various settings such as operation of the hot water storage and hot water supply apparatus 1 and hot water supply set temperature.

Next, a method of controlling the hot water storage and hot water supply device 1 will be described.
In the hot water storage operation, when the heat source device 3 is, for example, a heat pump type heat source device, the heat source device 3 is operated to introduce the hot water in the hot water storage tank 2 into the heat source device 3, and the hot water storage set temperature (eg, 65 ° C.) is set by the heat source device 3. hot water is stored from the upper part of the hot water storage tank 2. At this time, the control unit 21 controls the hot water storage operation by starting the hot water storage operation so that the hot water heat amount predicted based on the past hot water supply usage history is stored by the predicted time. In the case where the heat source device 3 is a heat source device that heats using the heat generated during power generation, the control unit 21 acquires the stored hot water heat amount based on the temperature detected by the stored hot water temperature sensors 2a to 2e, and the predetermined hot water storage tank 2 Heat dissipation operation control etc. are performed so that the upper limit of the stored hot water heat amount is not exceeded.

In the hot water supply operation, the control unit 21 performs hot water supply operation control to set the detection temperature of the mixing valve high temperature water inlet temperature sensor 8a (mixing valve high temperature water inlet temperature) and the detection temperature of the feed water temperature sensor 7a (feed water temperature). Based on the set hot water supply temperature, the mixture ratio of the mixing valve 4 is adjusted so that the temperature detected by the hot water supply temperature sensor 10b becomes equal to the set hot water supply temperature. This hot water supply operation control will be described based on the flowchart of FIG. Note that Si (i=1, 2, . . . ) in the flow chart represents a step.

When the hot water supply flow rate sensor 10a detects a flow rate equal to or higher than a predetermined flow rate due to the opening of the hot water supply tap 11 or the like, hot water supply operation control is started. In S1, based on the temperature detected by the stored hot water temperature sensor 2a and the set hot water supply temperature, it is determined whether or not to supply high-temperature water from the hot water storage tank 2 to the mixing valve 4 for use in supplying hot water. In this step, the hot water supply source is selected from the hot water storage tank 2 and the auxiliary heat source machine 14 . If the determination is Yes, the process proceeds to S2, in which high-temperature water is supplied from the hot water storage tank 2 to adjust the mixing ratio of the mixing valve 4, hot water is supplied at the set hot water supply temperature, and the process proceeds to S3.

In S3, it is determined whether or not the hot water storage tank 2 has enough heat to supply hot water. If the determination is Yes, the process proceeds to S4, in which it is determined whether or not the hot water supply flow rate sensor 10a detects a flow rate equal to or greater than a predetermined flow rate. If the determination is Yes, the process returns to S2, and if the determination is No, the process proceeds to S7.

On the other hand, if the determination in S1 is No, or if the determination in S3 is No, the process proceeds to S5. In S5, the hot water heated by the heating operation using the auxiliary heat source device 14 is supplied to the mixing valve 4 as high-temperature water, the mixture ratio of the mixing valve 4 is adjusted, and hot water is supplied at the hot water supply set temperature, and the process proceeds to S6. In S6, it is determined whether or not the hot water supply flow rate sensor 10a detects a flow rate equal to or higher than a predetermined flow rate. If the determination is Yes, the process returns to S5, and if the determination is No, the process proceeds to S7.

When the determination in S4 is No, or when the determination in S6 is No, in S7, the hot water supply standby control is started and the hot water supply operation control is stopped.

As described above, when the hot water supply source is the hot water storage tank 2, the stored hot water heat quantity is obtained based on the temperature detected by the stored hot water temperature sensors 2a to 2e. When the supply source of high-temperature water is the auxiliary heat source device 14, the three-way valve 19 is switched to the hot water use pipe 18 side to supply low-temperature water to the auxiliary heat source device 14 via the second branch pipe 20, and the pump 15 is turned on. It starts up, operates the auxiliary heat source machine 14, and controls the heating operation.

When the heat quantity of stored hot water decreases due to hot water supply and the supply source of high-temperature water is switched from the hot water storage tank 2 to the auxiliary heat source machine 14, the three-way valve 19 is switched to the auxiliary heating pipe 12 side, the pump 15 is started, and the auxiliary heat source machine is activated. 14 is operated to control the heating operation. When hot water is supplied by heating with the auxiliary heat source device 14, the three-way valve 19 is adjusted so that part of the hot water supplied to the hot water supply pipe 8 flows into the auxiliary heating pipe 12, and the discharge amount of the pump 15 is adjusted. By increasing , the hot water in the hot water storage tank 2 is prevented from being mixed with the high temperature water in the hot water outlet pipe 8, and good hot water outlet characteristics are ensured.

When the flow rate detected by the hot water supply flow rate sensor 10a becomes less than a predetermined flow rate due to closing of the hot water supply valve 11 or the like, the control unit 21 stops hot water supply operation control and enters a hot water supply standby state. In order to improve convenience for hot water supply users, the hot water storage/hot water supply apparatus 1 is required to be able to quickly supply hot water at the hot water supply set temperature when hot water supply is started. Therefore, the control unit 21 performs hot water supply standby control during the hot water supply standby so that the hot water supply at the hot water supply set temperature can be quickly supplied in the next hot water supply operation.

In the hot water supply standby control, the mixture ratio of the mixing valve 4 is adjusted according to the mixing valve high temperature water inlet temperature and the like so that the hot water supply can be performed at the hot water supply set temperature. This makes it possible to quickly supply hot water at the hot water supply set temperature after the start of hot water supply. This hot water supply standby control will be described based on the flowchart of FIG.

When hot water supply operation control is stopped and hot water supply standby control is started, it is determined in S10 whether hot water is being used for heating operation or the like. If the determination is Yes, the process proceeds to S11, and if the determination is No, the process proceeds to S19.

In S11, the temperature of hot water detected by the temperature sensors installed at various locations in the hot water storage and water heater 1 and the temperature of the water supply detected by the water supply temperature sensor 7a are acquired, and the process proceeds to S12. The temperature sensor for acquiring the hot water temperature is a temperature sensor arranged in a pipe or the like on the upstream side of the high-temperature water inlet of the mixing valve 4. A valve hot water inlet temperature sensor 8a, an auxiliary heat source unit outlet temperature sensor 12a, and a flow control valve temperature sensor 16a are included.

In S12, the highest hot water temperature is extracted from the hot water temperatures acquired in S11, and the process proceeds to S13. Then, in S13, the mixture ratio of the mixing valve 4 is adjusted based on the hot water temperature extracted in S12, the water supply temperature acquired in S11, and the set hot water supply set temperature, and the process proceeds to S14. At this time, by adjusting the mixture ratio, the mixing valve 4 is prepared to supply hot water at the hot water supply set temperature even if the hot water of the highest temperature is supplied.

In S14, it is determined whether or not the hot water use such as the heating operation has been stopped. When the hot water use is stopped and the determination is Yes, the process proceeds to S15, and when the hot water use is continued and the determination is No, the process returns to S11. In S15, it is determined whether or not a predetermined time (for example, 10 minutes) has passed since the use of hot water was stopped. If the determination is Yes after the predetermined time has elapsed, the process proceeds to S16, and if the determination is No, the process returns to S11.

In S16, the current mixing ratio of the mixing valve 4 is maintained and the process proceeds to S17. Since the mixing ratio is adjusted according to the highest hot water temperature among the hot water that can be supplied to the mixing valve 4 when the next hot water supply operation is started, hot water supply at a temperature higher than the hot water supply set temperature is prevented. be able to. Then, in S17, it is determined whether or not the use of hot water has been started. At S18, it is determined whether or not hot water supply has started.

On the other hand, if the determination in S10 is No, in S19, it is determined whether or not a preset standby time (for example, 10 minutes) has elapsed since the hot water supply operation was stopped. If the standby time has not elapsed and the determination is No, the process proceeds to S20, in which the mixing valve high-temperature water inlet temperature and the feed water temperature are obtained, and the process proceeds to S21. Then, in S21, the mixture ratio of the mixing valve 4 is adjusted based on the mixing valve high-temperature water inlet temperature and the feed water temperature acquired in S20, and the set hot water supply temperature, and the process proceeds to S23. At this time, the hot water at the inlet temperature of the hot water of the mixing valve is prepared so that it can be supplied at the hot water supply set temperature. If the standby time has elapsed and the determination in S19 is YES, the process proceeds to S22, where the current mixture ratio of the mixing valve 4 is maintained in S22, and the process proceeds to S23.

In S23, it is determined whether or not the use of hot water has been started. At S24, it is determined whether or not hot water supply has started.

As described above, when hot water is not being used at the start of hot water supply standby control, the control unit 21 sets the hot water supply mixture ratio of the mixing valve 4 according to the high temperature water inlet temperature of the mixing valve until the standby time elapses after the hot water supply is stopped. Adjust the temperature so that hot water can be supplied. This makes it possible to quickly supply hot water at the hot water supply set temperature after the start of hot water supply.

For example, for heating operation, when hot water is being used at the start of hot water supply standby control, or when hot water is started to be used during hot water supply standby control, the control unit 21 opens the heating solenoid valve 18c and closes the three-way valve 19. Switching to the hot water utilization pipe 18 side, the pump 15 is started, the auxiliary heat source device 14 is operated, and the heating operation is controlled. In the heating operation, hot water is heated to a predetermined temperature (for example, 80° C.) for heating operation.

At the same time, the control unit 21 adjusts the mixture ratio of the mixing valve 4 according to the highest hot water temperature among the hot water temperatures detected by the temperature sensor installed in the piping or the like on the upstream side of the high temperature water inlet of the mixing valve 4. to adjust. That is, the mixing ratio of the mixing valve 4 is adjusted according to the highest temperature of hot water that can be supplied to the mixing valve 4 when the hot water supply operation is started. When the hot water supply operation is started, even if the hot water heated for hot water use flows through the flow control valve 16 into the hot water discharge pipe 8, the mixture ratio corresponding to the highest hot water temperature is already prepared. , the hot water supply does not become hotter than the hot water supply set temperature.

When hot water is supplied while hot water is being used, the control unit 21 selects a supply source for supplying high-temperature water to the mixing valve 4 and controls the hot water supply operation in the same manner as in normal single hot water supply operation. When the supply source of high-temperature water is the auxiliary heat source device 14, the heating operation for using hot water and the heating operation for supplying hot water are performed together.

The action and effects of the present invention will be described.
The hot water storage/hot water supply apparatus 1 having a function of using the hot water in the hot water use pipe 18 performs hot water supply operation control in which hot water is adjusted to the hot water supply set temperature by the mixing valve 4 and hot water is supplied. Further, until the standby time elapses after the hot water supply operation control is stopped, hot water supply standby control is executed to adjust the mixing ratio according to the hot water temperature of the hot water inlet of the mixing valve 4 so as to supply hot water at the hot water supply set temperature. In the hot water supply standby control, the mixture ratio is adjusted according to the temperature of the highest temperature of hot water that can be supplied to the mixing valve 4 under predetermined conditions. Therefore, when the hot water supply operation is started during the hot water supply standby, even if the hot water of the highest temperature is supplied to the mixing valve 4, the hot water supply temperature is set to be higher than the hot water supply set temperature. hot water supply can be prevented.

As a predetermined condition, when the heating operation for supplying hot water to the hot water utilization pipe 18 is being executed, the mixture ratio is adjusted according to the temperature of the hot water with the highest temperature among the hot water that can be supplied to the mixing valve 4. do. Therefore, when hot water supply is started during standby for hot water supply, even if hot water with the highest temperature is supplied to the mixing valve 4 for hot water use, hot water supply at a temperature higher than the hot water supply set temperature can be prevented.

The mixing means may be a mixing device configured to adjust the mixing ratio by adjusting the flow rate of the high-temperature water flow control valve and the low-temperature water flow control valve, respectively. In this case also, the same effect as in the above embodiment can be obtained. In addition, those skilled in the art can implement various modifications to the above-described embodiments without departing from the scope of the present invention, and the present invention includes such modifications.

1: hot water storage and hot water supply device 2: hot water storage tanks 2a to 2e: hot water storage temperature sensor 3: heat source device 4: mixing valve (mixing means)
5: Heat source machine outgoing pipe 5a: Heat source machine outgoing temperature sensor 6: Heat source machine return pipe 6a: Heat source machine return temperature sensor 7: Water supply pipe 7a: Water supply temperature sensor 8: Hot water outlet pipe 8a: Mixing valve hot water inlet temperature sensor 9: First branch pipe (branch pipe)
10: Hot water supply pipe 10a: Hot water supply flow rate sensor 10b: Hot water supply temperature sensor 10c: Hot water supply flow rate adjustment valve 11: Hot water supply tap 12: Auxiliary heating pipe 12a: Auxiliary heat source unit outlet temperature sensor 14: Auxiliary heat source device 15: Pump 16: Flow rate adjustment valve 16a: Flow control valve temperature sensor 18: Hot water use pipe 18a: Heat exchanger for heating 18b: Bath reheating heat exchanger 18c: Heating solenoid valve 18d: Bath reheating solenoid valve 19: Three-way valve 20: Second branch pipe 21: Control unit 22: Operation terminal

Claims (1)

a hot water storage tank for storing hot water, a heat source device for circulating and heating the hot water in the hot water storage tank, a water supply pipe connected to the bottom of the hot water storage tank, a hot water outlet pipe connected to the top of the hot water storage tank, and A branch pipe of a water supply pipe, a hot water supply pipe and a hot water supply pipe are connected to a mixing means, an auxiliary heating pipe branched from the hot water supply pipe and connected to the hot water supply pipe on the mixing means side of the branch, and the auxiliary An auxiliary heat source device interposed in a heating pipe, a pump interposed in the auxiliary heating pipe on the inlet side of the auxiliary heat source device, and for adjusting the amount of hot water supplied from the auxiliary heating pipe to the hot water outlet pipe. A hot water storage hot water supply device comprising a flow rate adjustment valve and a hot water utilization pipe branched from the auxiliary heating pipe on the outlet side of the auxiliary heat source unit and connected to the auxiliary heating pipe on the inlet side of the pump, wherein the hot water supply Hot water supply operation control for supplying hot water from the hot water supply pipe adjusted to a hot water supply set temperature by adjusting the mixing ratio of the mixing means for mixing high temperature water supplied from the pipe and low temperature water supplied from the branch pipe; A hot water storage hot water supply apparatus that executes hot water supply standby control for adjusting the mixing ratio of the mixing means according to the hot water temperature at the high temperature water inlet of the mixing means until a preset waiting time elapses after the hot water supply operation control is stopped. In the control method of
In the hot water supply standby control, in a state in which the heating operation using the auxiliary heat source device is performed to supply hot water to the hot water pipe, the hot water temperature of the hot water storage tank detected by the hot water storage temperature sensor and the mixing The hot water temperature at the high-temperature water inlet of the mixing means detected by the valve high-temperature water inlet temperature sensor, the hot water temperature on the outlet side of the auxiliary heat source machine detected by the auxiliary heat source machine outlet temperature sensor, and the temperature sensor of the flow adjustment valve. and adjusting the mixing ratio of the mixing means in accordance with the highest hot water temperature among the hot water temperatures on the inlet side of the flow control valve .

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