JP2023002976A - Hot water storage and supply system - Google Patents

Abstract

To provide a hot water storage and supply system capable of stably supplying hot water at a hot water supply set temperature after restarting supply of hot water.SOLUTION: In a hot water storage and supply system (1) having a heat source machine (4) supplying hot water at a hot water supply set temperature by performing a heating operation when hot water supplied from a hot water storage unit (3) including a hot water storage tank (2) has a prescribed heating start temperature or less, the hot water storage unit (3) is provided with: a hot water mixing portion (14) adjusting a temperature by mixing the hot water of the hot water storage tank (2) and clean water and supplying the hot water to the heat source machine (4); hot water supply temperature detection means detecting a hot water supply temperature; stored hot water heat quantity detection means detecting a heat quantity of the stored hot water in the hot water storage tank (2); and a hot water storage unit control portion (18) controlling a hot water supply operation. The hot water storage unit control portion (18) uses, as a target temperature in adjusting the temperature, a hot water supply set temperature in a case when the heat quantity of stored hot water is a reference heat quantity or more, and a heating start temperature when it is less than the reference heat quantity, stores the hot water supply temperature in stopping the hot water supply operation, and uses, as the target temperature, the stored hot water supply temperature regardless of the heat quantity of stored hot water in a case when the hot water supply operation is started within a predetermined standby time after the stop of the hot water supply operation.SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD The present invention relates to a hot water storage system that uses hot water heated and stored by a main heat source machine to supply hot water.

2. Description of the Related Art Conventionally, there has been widely used a hot water storage and hot water supply system in which hot water heated by a heat pump heat source, for example, is stored in a hot water storage tank as a main heat source having a high heating operation efficiency, and the hot water in the hot water storage tank is used for hot water supply. The hot water discharged from the hot water storage tank is mixed with tap water in the hot water mixing unit, and hot water adjusted to the hot water supply set temperature is supplied.

When hot water at a temperature capable of supplying hot water at the hot water supply set temperature is not available in the hot water storage tank, the hot water discharged from the hot water storage tank is heated by, for example, a combustion type heat source as an auxiliary heat source having a large heating capacity. In the heating operation by the auxiliary heat source device, the heating capacity is adjusted in order to heat the hot water discharged from the hot water storage tank to the set hot water supply temperature.

If the temperature of the hot water in the hot water storage tank is lower than the set hot water supply temperature and close to the set hot water supply temperature, there is a risk that the temperature will be higher than the set hot water supply temperature even if the auxiliary heat source equipment is heated with the minimum heating capacity. Therefore, when heating with the auxiliary heat source equipment, tap water is mixed in the hot water mixing section to lower the temperature to below a predetermined temperature, and the water is introduced into the auxiliary heat source equipment, and the hot water supply set temperature is adjusted by the heating operation of the auxiliary heat source equipment. is configured to supply hot water.

By the way, after the hot water supply accompanied by the heating operation of the auxiliary heat source machine is stopped, there is a case where a certain amount of hot water is stored in the hot water storage tank by the main heat source machine until the hot water supply is restarted. When the hot water supply is resumed, if the hot water mixing unit remains in the same state (mixing ratio) as the previous hot water supply, there is a risk that the hot water in the hot water storage tank will be supplied with a temperature higher than the hot water supply set temperature, or the heating operation of the auxiliary heat source equipment. Therefore, there is a risk that hot water is heated to a temperature higher than the set hot water supply temperature and hot water is supplied.

Therefore, for example, as in Patent Document 1, when hot water supply is restarted in a short time, the hot water mixing unit closes the hot water storage tank side and opens the hot water side to allow low-temperature hot water to enter the auxiliary heat source machine, A technique for supplying hot water by adjusting the set temperature of hot water supply by heating operation of an auxiliary heat source machine is known. In addition, as in Patent Document 2, when the hot water supply is stopped, the hot water mixing unit is adjusted to a predetermined mixing ratio for standby, and after the hot water supply is restarted, the temperature of the hot water discharged from the hot water mixing unit is kept at the predetermined mixing ratio. A technique is known in which adjustment of the mixing ratio is started after the temperature reaches or exceeds the temperature.

Japanese Patent No. 5379083 Japanese Patent No. 4069853

However, in Patent Document 1, when the hot water supply is restarted in a short time, the temperature of the hot water entering the auxiliary heat source may become lower than that of the previous hot water supply. It takes time to supply hot water. In addition, in Patent Document 2, the mixing ratio of the hot water mixing unit during standby is usually small on the hot water storage tank side and large on the tap water side to ensure safety. It takes time to supply hot water stably.

SUMMARY OF THE INVENTION An object of the present invention is to provide a stored hot water supply system capable of stably supplying hot water at a hot water supply set temperature after resuming hot water supply.

A hot water storage and hot water supply system of the invention of claim 1 comprises a hot water storage unit having a hot water storage tank for storing hot water, and a heating operation performed in advance when the hot water discharged from the hot water storage unit is below a predetermined heating start temperature. A hot water storage and hot water supply system having a heat source device that supplies hot water at a hot water supply set temperature, wherein the hot water storage unit includes a hot water mixing unit that adjusts the temperature by mixing hot water in the hot water storage tank with tap water and supplies hot water to the heat source device. a hot water temperature detecting means for detecting a temperature of hot water discharged to the heat source machine; a stored hot water heat quantity detecting means for detecting a heat quantity of hot water stored in the hot water tank; When the stored hot water heat quantity is equal to or higher than a preset reference heat quantity, the set hot water supply temperature is adjusted as a target temperature, and when the stored hot water heat quantity is less than the reference heat quantity, the heating start temperature is adjusted as the target temperature. In the hot water storage and hot water supply system, the hot water storage unit control unit stores the hot water temperature detected by the hot water temperature detecting means when the hot water supply operation is stopped, and stores the hot water temperature detected by the hot water supply temperature detection means within a preset standby time after the hot water supply operation is stopped. The stored hot water temperature is set as the target temperature regardless of the stored hot water heat quantity when the hot water discharge operation is started.

According to the above configuration, the hot water that is adjusted to the hot water supply set temperature by the hot water storage unit is supplied without being heated by the heat source device, and the hot water that is adjusted by the hot water storage unit using the heating start temperature as the target temperature is delivered. is heated to the hot water supply set temperature by the heat source machine and hot water is supplied. The hot water supply operation by the hot water storage unit adjusts the temperature of the hot water to a target temperature set based on the heat quantity of the hot water stored in the hot water storage tank. When the hot water supply operation is stopped, the adjusted hot water supply temperature is stored, and when the hot water supply operation is restarted within the standby time, the stored hot water supply temperature is restored regardless of the hot water heat amount stored in the hot water storage tank. Adjust the temperature. Therefore, when the hot water supply operation is resumed within the standby time, hot water adjusted to the same hot water temperature as the previous hot water supply is supplied to the heat source device to reproduce the previous hot water supply condition, so that the stored hot water heat amount is reduced. It is possible to stably supply hot water at the hot water supply set temperature without being affected. Therefore, even when high-temperature hot water is stored in the hot water tank during the waiting time and the stored hot water heat quantity changes, the danger of supplying high-temperature hot water due to the high-temperature hot water can be prevented.

In the hot water storage and hot water supply system of the invention of claim 2, in the invention of claim 1, the hot water storage unit control unit controls the state of the hot water mixing unit when the hot water supply operation is stopped during standby after the hot water supply operation is stopped. characterized by maintaining
According to the above configuration, during standby after the hot water supply operation is stopped, the state of the hot water mixing section at the time when the hot water supply operation is stopped is maintained. Therefore, when the hot water supply operation is restarted within the standby time, the previous hot water supply situation is reproduced, and the hot water supply temperature can be easily adjusted to the previous hot water supply temperature.

According to a third aspect of the present invention, there is provided a hot water storage and hot water supply system according to the first aspect of the invention, wherein the hot water storage unit control section is configured such that the heat source equipment is performing a heating operation when the hot water supply operation is stopped. and setting the stored hot water discharge temperature as a target temperature when the hot water discharge operation is started within a preset waiting time after the hot water discharge operation is stopped.
According to the above configuration, the stored hot water temperature is set as the target temperature when the heat source device is performing the heating operation in the previous hot water supply and the hot water supply operation is started within the standby time. Therefore, even if high-temperature hot water is stored during standby, the stored high-temperature hot water is adjusted to the target temperature for adjusting the hot water temperature at the time of the previous hot water supply, and the stored high-temperature hot water is released. Since the amount of heat stored during the standby time is not large, if the temperature of the stored hot water is adjusted to the hot water supply set temperature and the hot water is to be supplied, the hot water will soon run out and the heating operation will be switched to by the heat source unit, and the hot water supply temperature will drop. It is not stable, but by reproducing the hot water supply with the previous heating operation, it is possible to prevent the situation where the hot water supply temperature is not stable.

According to the hot water storage system of the present invention, it is possible to stably supply hot water at the hot water supply set temperature after the hot water supply is restarted.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram of a configuration of a stored hot water supply system according to an embodiment of the present invention; 4 is a hot water supply operation control flowchart of the hot water storage unit. 4 is a target temperature setting flowchart for discharging hot water from the hot water storage unit. 4 is a heating operation control flow chart of the heat source equipment.

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

First, the configuration of a hot water storage and hot water supply system 1 of the present invention will be described based on FIG.
A hot water storage and hot water supply system 1 includes a hot water storage unit 3 having a hot water storage tank 2 and, for example, a combustion type heat source device 4 . The hot water storage unit 3 has, for example, a heat pump type heat source device as the main heat source device 5 , and performs hot water storage operation in which hot water heated to a predetermined hot water set temperature by the main heat source device 5 is stored in the hot water storage tank 2 . The heat source device 4 is an auxiliary heat source device that performs a heating operation when the temperature of hot water in the hot water storage tank 2 cannot supply hot water at the hot water supply set temperature. Depending on the temperature of the hot water discharged from the hot water storage unit 3, the heat source device 4 performs the heating operation or supplies hot water to the hot water tap 6 without performing the heating operation.

A main heat source machine going passage 8 having a pump 7 for supplying hot water from the hot water tank 2 to the main heat source machine 5 is connected to the lower portion of the hot water tank 2 . A main heat source machine return passage 9 for storing hot water heated by the main heat source machine 5 in the hot water tank 2 is connected to the top of the hot water tank 2 . In the middle of the main heat source machine return passage 9, a switching valve 10 for switching the flow path of hot water is provided. It is connected to a portion of the passage 8 upstream of the pump 7 .

A return temperature sensor 9 b for detecting the temperature of the hot water heated by the main heat source machine 5 is arranged upstream of the switching valve 10 in the main heat source machine return passage 9 . For example, when the temperature detected by the return temperature sensor 9b immediately after the start of the main heat source machine 5 is lower than a predetermined stored hot water set temperature, the switching valve 10 is switched from the hot water storage tank 2 side to the return branch passage 9a side to enable sufficient heating. The hot water is circulated without being returned to the hot water storage tank 2 until it becomes .

A water supply passage 11 for supplying tap water indicated by an arrow CW is connected to the bottom of the hot water storage tank 2 . A hot water discharge passage 12 for discharging hot water in the hot water storage tank 2 from the hot water storage unit 3 is connected to the top of the hot water storage tank 2 . A water supply branch passage 11 a branched from the middle of the water supply passage 11 is connected to a mixing valve 14 (hot water mixing section) disposed in the middle of the hot water discharge passage 12 . The mixing valve 14 mixes the hot water discharged from the hot water storage tank 2 and the tap water and discharges the hot water. Instead of the mixing valve 14, the hot water mixing section may be configured by a flow rate adjusting valve for adjusting the flow rate on the hot water storage tank 2 side and a flow rate adjusting valve for adjusting the flow rate on the water supply branch passage 11a side.

A plurality of stored hot water temperature sensors 2a to 2d are arranged in the hot water storage tank 2 in the height direction, and the temperature and amount of hot water stored in the hot water storage tank 2 can be detected. The plurality of stored hot water temperature sensors 2 a to 2 d correspond to stored hot water heat amount detection means for detecting the stored hot water heat amount of the hot water storage tank 2 .

The water supply passage 11 is provided with a water supply temperature sensor 11b for detecting the temperature of the tap water supplied from the water supply passage 11 (water supply temperature). In the hot water passage 12, a hot water flow rate sensor 12a for detecting the hot water flow rate from the hot water storage unit 3, a hot water storage tank hot water temperature sensor 12b for detecting the temperature of the hot water discharged from the hot water storage tank 2 (hot water storage tank hot water temperature), A hot water temperature sensor 12c (hot water temperature detecting means) for detecting the hot water temperature from the unit 3 is provided.

A hot water outlet passage 12 of the hot water storage unit 3 and a water supply port 4 a of the heat source machine 4 are connected by a hot water passage 15 . A hot water supply port 4 b of the heat source device 4 is connected to a hot water supply passage 16 connected to a hot water supply valve 6 . The heat source device 4 includes an incoming water temperature sensor 4c that detects the temperature of hot water entering from the water supply port 4a, a hot water supply temperature sensor 4d that detects the temperature of hot water that is supplied from the hot water supply port 4b, and a hot water supply that detects the flow rate of hot water supply. It has a flow rate sensor 4e. Hot water discharged from the hot water storage unit 3 is supplied to the hot water tap 6 via the heat source device 4, and hot water is supplied from the hot water tap 6 as indicated by an arrow HW.

The hot water storage unit 3 drives the main heat source machine 5 and the pump 7, circulates hot water between the hot water storage tank 2 and the main heat source machine 5, and stores the hot water heated by the main heat source machine 5 from the top of the hot water storage tank 2. It has a hot water storage unit control section 18 for controlling hot water storage operation. An operation terminal 19 is connected to the hot water storage unit control section 18 and the heat source device 4 for the user to set, for example, the set temperature of the hot water supply.

The hot water storage unit control unit 18 controls the output hot water temperature detected by the hot water storage tank output hot water temperature sensor 12b, the water supply temperature detected by the water supply temperature sensor 11b, and the output hot water flow rate detected by the output hot water flow rate sensor 12a. The mixing ratio in the mixing valve 14 is adjusted so that the temperature detected by the temperature sensor 12c is the preset hot water supply temperature or the predetermined heating start temperature, and the hot water is discharged. The hot water storage unit control section 18 also acquires (calculates) the amount of stored hot water heat based on the temperatures detected by the stored hot water temperature sensors 2a to 2d (heat amount detection means for stored hot water).

The hot water storage operation by the hot water storage unit control section 18 is executed, for example, so that the hot water storage tank 2 is filled with hot water at the set hot water storage temperature at a set time. Further, when the stored hot water heat quantity becomes less than the reference heat quantity, the hot water storage operation may be executed so that the hot water storage tank 2 is filled with hot water at the hot water storage set temperature, based on the hot water supply use learned and stored by the hot water storage unit control section 18. The hot water storage operation may be executed so as to store the required amount of heat predicted by the hot water storage method.

Next, the hot water supply operation control of the hot water storage unit control section 18 in the hot water supply operation in which the hot water whose temperature is adjusted by the hot water storage unit 3 is supplied to the heat source device 4 will be described based on the flowchart of FIG. Si (i=1, 2, . . . ) in the figure represents steps.

When the hot water supply operation control is started, it is determined in S1 whether or not the hot water flow rate sensor 12a has detected the hot water flow rate. This step S1 is a step for judging the start of hot water supply, and in order to detect the start of hot water supply from the hot water storage unit 3 accompanying the start of hot water supply at the hot water tap 6, the judgment of S1 is repeated. When the determination of S1 is No, the determination of S1 is performed again, and when the determination of S1 is Yes, the process proceeds to S2.

In S2, a target temperature for adjusting the temperature of the hot water to be discharged when the hot water supply operation is started is set, and the process proceeds to S3. As shown in FIG. 3, the target temperature setting at the start of the hot water supply operation is determined in S21 as to whether or not a predetermined waiting time (for example, a short period of about 3 to 10 minutes) has elapsed since the last hot water supply was stopped. If the determination in S21 is YES due to the lapse of the standby time, the process proceeds to S22, and in S22, it is determined whether or not the stored hot water heat quantity is equal to or greater than a predetermined reference heat quantity. The reference amount of heat is set in advance as a reference for operating the heat source equipment 4 . When the heating operation of the heat source device 4 is started after the hot water of the hot water storage temperature in the hot water storage tank 2 is used up, the hot water supply temperature is prevented from fluctuating due to insufficient heating. When it becomes, the heating start temperature is set as the target temperature, and the heating operation is started. For example, the amount of heat when hot water at the hot water supply set temperature is stored up to the position of the stored hot water temperature sensor 2d on the uppermost stage is set as the reference amount of heat.

If the determination in S22 is YES, the process proceeds to S23, in which the set hot water supply temperature is set as the target temperature for temperature control, and the process returns. If the determination in S22 is No, the process proceeds to S24, in which the heating start temperature is set as the target temperature for temperature control, and the process returns. On the other hand, if the standby time has not elapsed and the determination in S21 is No, the process proceeds to S25, sets the hot water outlet temperature of the previous hot water outlet operation stored in S25 as the target temperature for temperature adjustment, and returns. Therefore, after the standby time has elapsed, the target temperature is set based on the stored hot water heat quantity, and if hot water supply is restarted in a short time before the standby time has elapsed, the stored hot water discharge temperature of the previous hot water discharge operation will be set regardless of the stored hot water heat quantity. is set as the target temperature.

Next, in S3 of FIG. 2, it is determined whether or not the target temperature set in S2 is the set hot water supply temperature. If the determination in S3 is YES, the process proceeds to S4, in which hot water whose temperature is adjusted to the target temperature (hot water supply set temperature) is supplied, and the process proceeds to S5. Then, in S5, it is determined whether or not the stored hot water heat amount remains equal to or greater than the reference heat amount, and if the determination in S5 is Yes, the process proceeds to S8. If the determination in S5 is No, the process proceeds to S6, in which the target temperature is changed to the heating start temperature, and the process proceeds to S8. On the other hand, if the determination in S3 is No, the process proceeds to S7, in which hot water whose temperature is adjusted to the target temperature (the heating start temperature or the stored hot water temperature) is discharged, and the process proceeds to S8. When the hot water in the hot water storage tank 2 is below the target temperature, the hot water below the target temperature is discharged.

Next, in S8, it is determined whether or not the outlet heated water flow rate sensor 12a has detected no flow rate. This is a determination step for stopping the supply of hot water when the hot water supply is stopped by closing the hot water supply valve 6 . If the determination in S8 is No (in the case of continuation of hot water supply), the process returns to S3. If the determination in S8 is Yes (if hot water supply is to be stopped), the process proceeds to S9, where the hot water supply operation is stopped, and the process proceeds to S10.

In S10, the hot water temperature detected by the hot water temperature sensor 12c when the hot water supply operation is stopped is stored, and the process proceeds to S11. Then, in S11, it is determined whether or not a predetermined waiting time has elapsed.

If the determination in S11 is No, the process proceeds to S12, and in S12, the state (mixing ratio) of the mixing valve 14 when the hot water supply operation is stopped is maintained, and the process proceeds to S13. Then, in S13, it is determined whether or not the outlet heated water flow rate sensor 12a has detected the outlet heated water flow rate. By maintaining the state (mixing ratio) of the mixing valve 14, when hot water supply is restarted within the standby time, hot water is discharged by adjusting the stored hot water outlet temperature as a target temperature without adjusting the mixing ratio. can be done. Therefore, it is possible to immediately reproduce the previous hot water supply condition and stably supply hot water at the hot water supply set temperature.

On the other hand, if the determination in S11 is Yes, the process proceeds to S14, in which the state (mixing ratio) of the mixing valve 14 is adjusted to the standby state and returns, and this hot water supply operation control is started again from S1. In the standby state of the mixing valve 14, the side of the water supply branch passage 11a is wide open in order to prevent hot water from being discharged from the hot water storage unit 3 when high temperature hot water is stored in the hot water storage tank 2 by the hot water storage operation during standby. is set to When the hot water supply is restarted after the standby time has elapsed, the target temperature is set according to the stored hot water heat amount, and the mixing ratio of the mixing valve 14 is adjusted to supply the hot water. If the previous hot water supply was a hot water supply in which the heating operation was performed by the heat source device 4, the stored hot water heat amount may have increased sufficiently due to the hot water storage operation during standby, so the target temperature should be set according to the stored hot water heat amount. This enables optimal hot water operation.

The heat source device 4 supplies hot water whose temperature is adjusted by the hot water supply operation of the hot water storage unit 3 to the hot water tap 6 . The heating operation control at this time will be described based on the flowchart of FIG.
When the heating operation control is started, it is determined in S31 whether or not the hot water supply flow rate sensor 4e has detected the hot water supply flow rate. This step S31 is a step for determining the start of hot water supply, and is configured to repeat the determination of S31 when hot water is not being supplied so that the start of hot water supply at the hot water tap 6 can be detected. If the determination of S31 is No, the determination of S31 is performed again, and if the determination of S31 is Yes, the process proceeds to S32.

In S32, it is determined whether or not the incoming water temperature detected by the incoming water temperature sensor 4c of the heat source device 4 is higher than the heating start temperature. This is the step of determining whether or not the heat source device 4 performs the heating operation. The heating start temperature may be set according to the hot water supply set temperature so that, for example, when the heating operation is performed with a heating capacity equal to or higher than the minimum heating capacity, hot water supply can be performed at the hot water supply set temperature. It may be set as the starting temperature.

If the determination in S32 is YES, the process proceeds to S33, in which hot water is supplied without performing the heating operation, and the process proceeds to S36. On the other hand, if the determination in S32 is No, the process advances to S34 to calculate the required amount of heat required to supply hot water at the set hot water supply temperature based on the incoming water temperature, the hot water supply flow rate, and the hot water supply set temperature, and then the process advances to S35. Then, in S35, the heating operation of the required amount of heat is performed to supply hot water heated to the hot water supply set temperature, and the process proceeds to S36.

In S36, it is determined whether or not the hot water supply flow rate sensor 4e has detected no hot water supply flow rate. If the determination in S36 is No (if hot water supply continues), the process returns to S32. If the determination in S36 is Yes (if the hot water supply is finished), the process proceeds to S37, where the hot water supply is stopped (the heating operation is stopped if the heating operation is being performed) and returns, and the heating operation control starts again from S31. be done. A heating control section (not shown) of the heat source device 4 may perform this heating operation control, or the hot water storage unit control section 18 may be configured to perform heating operation control of the heat source device 4 .

The operation and effects of the hot water storage and hot water supply system 1 will be described.
The hot water which is adjusted to the hot water supply set temperature by the hot water storage unit 3 and is discharged is supplied without being heated by the heat source machine 4.例文帳に追加The hot water that is discharged from the hot water storage unit 3 with the heating start temperature as the target temperature is heated to the hot water supply set temperature by the heat source device 4 and then supplied. The hot water supply operation by the hot water storage unit 3 adjusts the temperature of hot water so that it reaches a target temperature set based on the heat quantity of hot water stored in the hot water storage tank 2 . When the hot water supply operation is stopped, the adjusted hot water supply temperature is stored, and when the hot water supply operation is restarted within the standby time, the stored hot water supply temperature is set regardless of the hot water heat amount stored in the hot water storage tank 2. Adjust the temperature to

Therefore, when the hot water supply operation is restarted within the standby time, the hot water whose temperature is adjusted to the same hot water supply temperature as the previous hot water supply is supplied to the heat source device 4 to reproduce the previous hot water supply situation. It is possible to stably supply hot water at the hot water supply set temperature without being affected by the temperature. Therefore, even when high-temperature hot water is stored in the hot-water storage tank 2 during the standby time and the stored hot-water heat quantity changes, the danger of high-temperature hot water supply due to this high-temperature hot water can be prevented. Further, when the heating operation was performed by the heat source device 4 in the previous hot water supply, the amount of heat stored during the standby time is not large. Since the hot water supply runs out and the heating operation is switched to the heat source device 4, the hot water supply temperature is not stabilized, but since the previous hot water supply condition is reproduced, the situation where the hot water supply temperature is not stabilized can be prevented.

During standby after the hot water supply operation is stopped, the state of the mixing valve 14 (hot water mixing section) at the time when the hot water supply operation is stopped is maintained. Therefore, when the hot water supply operation is restarted within the standby time, the previous hot water supply situation is reproduced, and the hot water supply temperature can be easily adjusted to the previous hot water supply temperature.

When the heat source device 4 was performing the heating operation in the previous hot water supply and the hot water discharge operation was started within the standby time, the stored hot water discharge temperature is set as the target temperature. Therefore, even if high-temperature hot water is stored during standby, the stored high-temperature hot water is adjusted to the target temperature for adjusting the hot water temperature at the time of the previous hot water supply, and the stored high-temperature hot water is released. Since the amount of heat stored during the standby time is not large, if the temperature of the stored hot water is adjusted to the hot water set temperature and the hot water is to be supplied, the hot water will soon run out and the heating operation of the heat source device 4 will switch to hot water supply. Although the hot water supply temperature is not stable, it is possible to prevent the situation where the hot water supply temperature is not stable by reproducing the hot water supply accompanied by the previous heating operation.

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 system 2: hot water storage tanks 2a to 2d: hot water temperature sensor (storage hot water heat detection means)
3: Hot water storage unit 4: Heat source machine (auxiliary heat source machine)
5: Main heat source machine 6: Hot water tap 7: Pump 8: Main heat source machine going passage 9: Main heat source machine return passage 9a: Return branch passage 10: Switching valve 11: Water supply passage 11a: Water supply branch passage 11b: Water supply temperature sensor 12 : outlet hot water passage 12a : outlet hot water flow rate sensor 12b : outlet hot water temperature sensor 12c : outlet hot water temperature sensor (outlet hot water temperature detecting means)
14: Mixing valve (hot water mixing part)
15: hot water passage 16: hot water supply passage 18: hot water storage unit control section 19: operation terminal

Claims (3)

A hot water storage unit having a hot water storage tank for storing hot water and a heat source device for supplying hot water at a preset hot water supply setting temperature by performing a heating operation when the hot water discharged from the hot water storage unit is below a predetermined heating start temperature. A hot water storage and hot water supply system,
The hot water storage unit includes a hot water mixing unit that adjusts the temperature of the hot water in the hot water storage tank with tap water and discharges hot water to the heat source machine, a hot water temperature detection means that detects the temperature of the hot water discharged to the heat source machine, and the A stored hot water calorific value detecting means for detecting the calorie of hot water stored in the hot water storage tank, and a hot water storage unit control section for controlling the operation of discharging hot water to the heat source device, and when the calorific value of the stored hot water is equal to or higher than a preset reference calorific value, the hot water supply set temperature is set. In a stored hot water supply system configured to adjust the temperature as a target temperature and adjust the heating start temperature as the target temperature when the stored hot water heat quantity is less than the reference heat quantity,
The hot water storage unit control unit stores the hot water temperature detected by the hot water temperature detecting means when the hot water discharge operation is stopped, and the hot water discharge operation is started within a preset standby time after the hot water discharge operation is stopped. , wherein the stored hot water outlet temperature is set as the target temperature regardless of the stored hot water heat quantity. 2. The hot water storage and hot water supply system according to claim 1, wherein the hot water storage unit control section maintains the state of the hot water mixing section at the time when the hot water supply operation is stopped during standby after the hot water supply operation is stopped. The hot water storage unit control section controls the hot water supply operation to be performed within a preset waiting time after the hot water supply operation is stopped, in a case where the heat source equipment is performing a heating operation when the hot water supply operation is stopped. 2. The stored hot water supply system according to claim 1, wherein the stored hot water outlet temperature is set as a target temperature when started.

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