JP2019078513A - Hot water supply system, hot water supply control program, hot water supply control method and water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize efficient hot water supply by improving utilization efficiency of heat storage and reducing pressure loss. SOLUTION: A heat storage tank (8) for storing a heat medium (ME1) and a heat exchanger (10) for exchanging heat of the heat medium with water are provided, and the temperature of the heat medium circulating in the heat exchanger is detected. A water amount adjusting means (water amount adjustment) that distributes the temperature sensor (22) and the water supply to the heat exchanger (10) and the bypass path (bypass pipe 16) and adjusts the distribution amount of the water to the heat exchanger and the bypass path. Part 12), the pump (9) that circulates the heat medium that exchanges heat with the water supply from the heat storage tank to the heat exchanger through the circulation path, and the detection temperature of the heat medium whether hot water can be discharged at the first set temperature (Ts1). If hot water cannot be discharged at the first set temperature (Ts1), the heat is switched to the second set temperature (Ts2) lower than the first set temperature, and the heat is adjusted by the water amount adjusting means (water amount adjusting unit 12). The control unit (20) is provided to reduce the amount of water supplied to the exchanger from the time when the first set temperature is discharged. [Selection diagram] Fig. 1

Description

The present invention relates to a control technology of a heat exchanger which exchanges heat of a heat medium of a heat storage tank to water supply.

Exhaust heat is heat-exchanged to a heat medium, and the heat medium is stored in a heat storage tank for heat storage. In this heat storage tank, a so-called hierarchical heat storage method is adopted in which a heat medium having a low temperature is heated from the lower layer side, heated to high temperature, and returned to the upper layer side of the heat storage tank. In heat storage utilization from a heat storage tank utilizing such a heat storage system, a heat medium is taken out from the upper layer side and heat exchange is performed with warm water.
With regard to such heat exchange, when the heat medium of the heat storage tank is heat-exchanged to the water supply, depending on the heat storage amount of the heat storage tank, insufficient heat is generated when the water supply is heated to the set temperature. It is known that the amount of heat shortage is compensated by an auxiliary heating source and the temperature of the hot water is raised to a set temperature (Patent Document 1).

JP, 2011-214793, A

By the way, the technique of patent document 1 can utilize heat storage of a thermal storage tank efficiently for feedwater heating, and the practicability is highly evaluated.
However, even if the heat storage tank has little heat storage, if it is intended to use it entirely for feedwater heating, the amount of circulation of the heat medium relative to the feedwater flowing through the heat exchanger will be increased to the limit. In such control, in the heat exchanger, for example, the plate heat exchanger, the water supply passage is thin, and the pressure loss can not be ignored.
Moreover, disturbing the stratification state of hierarchical heat storage in the heat storage tank has a problem that the heat storage utilization efficiency is lowered even if the heat exchange efficiency is high.
Then, in view of the said subject, the objective of this invention is improving utilization efficiency of thermal storage, aiming at reduction of a pressure loss, and implement | achieving efficient hot-water supply.

In order to achieve the above object, according to one aspect of the hot water supply system of the present invention, there is provided a hot water supply system comprising a heat storage tank for storing a heat medium and a heat exchanger for exchanging heat of the heat medium to water supply. A temperature sensor for detecting the temperature of the heat medium circulating to the heat exchanger, and a feed water is distributed to the heat exchanger and the bypass passage, and the amount of water to adjust the distribution amount of the feed water flowing to the heat exchanger and the bypass passage The adjusting means, the pump for circulating the heat medium which exchanges heat with the water supply from the heat storage tank to the heat exchanger through the circulation path, and judging whether the hot water can be discharged at the first set temperature by the detected temperature of the heat medium If the hot water can not be discharged due to the first set temperature, the distribution amount of the water supplied to the heat exchanger adjusted by the water amount adjustment means is switched to a second set temperature lower than the first set temperature. Said first And a control unit for reducing than at tapping of the set temperature.
In this hot water supply system, if the hot water supply unit converts the water supply into hot water and discharges hot water by the heat exchanger, and the hot water discharge temperature of the hot water supply unit is lower than the first set temperature, the hot water is set to the first set temperature Or, it may be provided with an auxiliary heating unit that heats to another temperature to let it flow out.
In order to achieve the above object, according to one aspect of the hot water supply control program of the present invention, it is a hot water supply control program to be realized by a computer, which is detected from a temperature sensor that detects the temperature of the heat medium circulating in the heat exchanger. A function of acquiring a temperature, and a function of distributing the feed water to the heat exchanger and the bypass, and controlling the distribution of the water amount adjusting means for adjusting the distribution of the feed water flowing to the heat exchanger and the bypass; A function of controlling a pump that circulates a heat medium that exchanges heat with the water supply from the heat storage tank to the heat exchanger through a circulation path, and whether or not hot water can be output at a first set temperature according to the detected temperature of the heat medium If it is determined that hot water can not be discharged due to the first set temperature, the temperature is switched to a second set temperature lower than the first set temperature, and flows to the heat exchanger adjusted by the water amount adjusting unit And a serial function to reduce the water distribution amount from the time of pouring of the first set temperature is achieved on the computer.

In order to achieve the above object, according to one aspect of the hot water supply control method of the present invention, there is provided a hot water supply control method using a heat storage tank for storing a heat medium and a heat exchanger for exchanging heat of the heat medium to water supply. The step of detecting the temperature of the heat medium circulating to the heat exchanger, and distributing the feed water to the heat exchanger and the bypass passage by means of a water amount adjustment means, and distributing the feed water to the heat exchanger and the bypass passage The step of adjusting the amount, the step of circulating the heat medium which exchanges heat with the water supply from the heat storage tank through the circulation path to the heat exchanger, and whether the hot water can be discharged by the first set temperature according to the temperature of the heat medium And in the step of determining, if the hot water can not be discharged at the first set temperature, switching to a second set temperature lower than the first set temperature, the water supplied to the heat exchanger adjusted by the water amount adjusting means Distribution amount of And a step of reducing than at the tapping of the first set temperature.
In this hot water supply control method, the step of converting the water supply into hot water and discharging the hot water by the heat exchanger, and the hot water at the first set temperature or the other if the output temperature is less than the first set temperature. And heating the mixture to a temperature of

In order to achieve the above object, according to one aspect of the water heating apparatus of the present invention, there is provided a heat storage tank for storing a heat medium, and a heat exchanger comprising a heat exchanger for exchanging heat of the heat medium to water supply. A temperature sensor for detecting the temperature of the heat medium circulating to the heat exchanger, and a feed water is distributed to the heat exchanger and the bypass passage, and the amount of water to adjust the distribution amount of the feed water flowing to the heat exchanger and the bypass passage The adjusting means, the pump for circulating the heat medium which exchanges heat with the water supply from the heat storage tank to the heat exchanger through the circulation path, and judging whether the hot water can be discharged at the first set temperature by the detected temperature of the heat medium If the hot water can not be discharged due to the first set temperature, the distribution amount of the water supplied to the heat exchanger adjusted by the water amount adjustment means is switched to a second set temperature lower than the first set temperature. The first set temperature Of a control unit for reducing than at tapping.
In this hot water supply apparatus, provided separately or integrally with the hot water supply apparatus, if the hot water temperature of the hot water supply apparatus is less than the first set temperature, the water supplied from the hot water supply apparatus or the hot water is used as the first set temperature or the other It may be provided with an auxiliary heating unit that heats to a temperature of 50 ° C. to be discharged.

  According to the present invention, any of the following effects can be obtained.

(1) Even when the heat storage of the heat storage tank does not reach the heat quantity required for the hot water of the set temperature, the heat medium of the heat storage tank is used, so that the heat medium heat quantity can be effectively used.
(2) When the heat storage of the heat storage tank does not reach the heat quantity required for the hot water at the set temperature, the amount of heat exchange water supplied to the heat exchanger can be reduced, and the pressure loss on the heat exchanger side can be reduced.

(3) When circulating the heat medium to the heat exchanger, a circulating pump is generally used. However, since the amount of circulation can be reduced, excessive rotation of the pump rotational speed of the circulating pump can be suppressed, etc. Power can be reduced.
(4) When the heat storage of the heat storage tank does not reach the amount of heat required for the hot water at the set temperature, the amount of heat medium used in the heat storage tank is reduced. Can be used efficiently.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the hot-water supply system which concerns on one Embodiment. It is a figure for demonstrating temperature control of a hot-water supply part. It is a flowchart which shows the processing procedure of hot-water supply control. FIG. 1 is a diagram showing a hot water supply system according to a first embodiment. It is a block diagram showing a control system. A is a table showing the feed water temperature, temperature after heat exchange, heat exchange amount and minimum heat medium temperature when obtaining the hot water supply set temperature Ts1 = 35 [° C.], and B is the case when the hot water supply temperature set Ts1 = 40 [° C.] Table showing the water supply temperature, temperature after heat exchange, amount of heat exchange and minimum heat medium temperature, C is the temperature of water supply, temperature after heat exchange, amount of heat exchange and minimum heat medium when obtaining hot water setting temperature Ts1 = 45 [° C] It is a table which shows temperature. It is a figure which shows the minimum heat-medium temperature with respect to the water supply temperature at the time of using hot-water supply preset temperature as a parameter. It is a figure for demonstrating the hot-water supply operation | movement corresponding to heat storage. It is a flowchart which shows the processing procedure of a hot-water supply system comprehensively. It is a flowchart which shows the processing procedure of a fuel cell unit. It is a flowchart which shows the processing procedure of a hot-water supply unit. It is a flowchart which shows the processing procedure of a backup hot-water supply unit. It is a figure which shows the pressure loss with respect to a passing flow rate ratio. FIG. 7 is a diagram showing a hot water supply system according to a second embodiment. It is a figure which shows the hot-water supply system which concerns on Example 3. FIG.

[One embodiment]
FIG. 1 shows a hot water supply system according to an embodiment of the present invention. The configuration shown in FIG. 1 is an example, and the present invention is not limited to such a configuration.
The hot water supply system 2 includes a hot water supply unit 4 and an auxiliary heating unit 6. The hot water supply unit 4 heat-exchanges the heat of the heat medium ME 1 with the water supply W, and guides the hot water HW to the auxiliary heating unit 6. In the auxiliary heating unit 6, if the warm water HW from the hot water supply unit 4 has a set temperature, the warm water HW is discharged as it is, and if it is less than the set temperature, the heated water is raised to the set temperature by auxiliary heating. I will

The hot water supply unit 4 includes a heat storage tank 8, a pump 9, a heat exchanger 10, and a water amount adjustment unit 12. The heat storage tank 8 is stored by the heat medium ME1. The heat medium ME1 extracted from the lower layer side of the heat storage tank 8 is circulated and heated to the heat source side (not shown), and the heat medium ME1 heated to high temperature is returned to the upper layer side of the heat storage tank 8. Thus, heat storage is performed in the heat storage tank 8 in a stratified state in which the heat storage tank 8 rises from the lower layer to the upper layer.
The pump 9 is operated when the heat of the heat medium ME1 is heat-exchanged to the feed water W, and the heat medium ME1 is circulated to the heat exchanger 10.
For example, a plate heat exchanger is used for the heat exchanger 10. At the time of heat exchange, the heat medium ME1 taken out from the upper layer side of the heat storage tank 8 to the circulation path 13 is circulated through the circulation path 13 to the heat exchanger 10 by operating the pump 9, and the lower layer of the heat storage tank 8 after heat exchange. Be returned to the side.

The water amount adjustment unit 12 is an example of the water amount adjustment means of the heat exchanger 10, distributes the feed water W to the heat exchanger 10 and the bypass pipe 16 which is an example of the bypass passage, and adjusts the water flow rate of the heat exchanger 10. The water supply W from the water supply pipe 14 flows to the inlet side of the heat exchanger 10 through the water amount adjustment unit 12 or flows from the bypass pipe 16 to the hot water discharge pipe 18. In the water amount adjustment unit 12, the control unit 20 is provided with the mixing valve M1 whose opening degree is controlled, and the distribution amount of the water supply W to be flowed to the heat exchanger 10 and the bypass pipe 16 is adjusted.
The temperature of the heat medium ME1 circulated from the heat storage tank 8 to the heat exchanger 10 is detected by the temperature sensor 22. The temperature of the hot water HW obtained by mixing the feed water W of the bypass pipe 16 with the hot water HW of the hot water discharge pipe 18 is detected by the temperature sensor 24.

  The water supply W or the hot water HW is supplied to the auxiliary heating unit 6 from the hot water supply unit 4. When the temperature of the water supply W or the warm water HW is low, the auxiliary heating unit 6 performs the auxiliary heating of the water supply W or the warm water HW. The auxiliary heating unit 6 is provided with a heat exchanger 26 and a heat exchanger 28. The heat exchanger 26 exchanges heat between the water supply W or the hot water HW from the water supply unit 4 supplied from the water supply pipe 30 and the heat medium ME2. The heat exchanger 28 exchanges the heat of the heat source 34 with the heat medium ME2. The temperature sensor 32 detects the temperature of the water supply W or the hot water HW passing through the water supply pipe 30. A bypass pipe 36 is branched from the water supply pipe 30, and a water amount adjustment unit 38 including the bypass pipe 36 and the mixing valve M2 is provided, and the water supply W or the hot water HW is discharged from the water supply pipe 30 according to the opening degree of the mixing valve M2. The hot water HW of the pipe 40 is mixed and discharged.

  The control unit 20 determines whether it is possible to take out the hot water at the first set temperature Ts1 based on the detected temperature of the heat medium ME1, and when the hot water can not be output at the set temperature Ts1, the second set temperature Ts2 (<Ts1) To reduce the distribution amount of the water supply W flowing to the heat exchanger 10 adjusted by the water amount adjustment unit 12 from the time of hot water discharge of the set temperature Ts1. The set temperature Ts1 is, for example, a temperature arbitrarily set by the user from the remote control device, and is stored in the storage means. On the other hand, the set temperature Ts2 is a temperature set by the determination of the control unit 20, is stored in the storage unit, and is read as necessary.

According to such a hot water supply system 2, warm water HW which heated the feed water W by heat exchange with the heat medium ME1, that is, warm water HW having a temperature (Ts1 + α1) higher than the set temperature Ts1 by a predetermined temperature α1 (eg 6 ° C.). And the non-heated water supply W are mixed, and hot water supply is performed at the set temperature Ts1.
With regard to this control, reference is made to FIG.
a) The rotational speed of the pump 9 is controlled so that the detected temperature To1 (temperature after heat exchange) which is the temperature of the warm water HW after passing through the heat exchanger 10 becomes the temperature (Ts1 + α1). If To1> (Ts1 + α1), the rotational speed of the pump 9 is decreased, and if To1 <(Ts1 + α1), the rotational speed of the pump 9 is increased.
b) Regarding the flow path of the water amount adjustment unit 12, if the heat exchanger 10 side port of the mixing valve M1 is A route and the bypass pipe 16 side port of the mixing valve M1 is B route, the detection temperature Tm1 becomes the set temperature Ts1 Thus, the flow rate ratio (mixing ratio) of the A route and the B route is controlled.
Since the relationship between the detected temperature To1 and the detected temperature Ti1 of the water supply W is usually To1> Ti1, in the control of the flow rate ratio, if Tm1> Ts1, the flow rate ratio of the B route is increased, and if Tm1 <Ts1 Control to increase the flow rate ratio of the A route is performed.

Here, when the detected temperature T1 of the heat medium ME1 decreases, the rotation speed of the circulating pump 9 increases by the control of a), and the detected temperature T1 decreases to a temperature at which the detected temperature To1 can not maintain the temperature (Ts1 + α1). When it shifts to, the rotational speed of the circulation pump 9 reaches the upper limit rotational speed.
In the control of b), if the detected temperature To1 is maintained at the temperature (Ts1 + α1), the control continues, but as the detected temperature To1 decreases, the flow rate ratio of the A route increases and finally A The flow rate ratio of the route will reach 100%.
In order to improve the rotational speed of the pump 9, in Japanese Patent No. 5577135, when the detected temperature T1 falls below a predetermined temperature, the detected temperature To1 is a predetermined temperature α2 (for example, 5 ° C.) than the detected temperature T1. The temperature is controlled to be as low as possible, that is, the detected temperature To1 = (T1−α2). Thereby, an excessive increase in the rotational speed of the pump 9 can be prevented. However, when mixing control is performed so that the detection temperature Tm1 becomes the set temperature Ts1, the flow rate ratio of the A route increases with the decrease of the detection temperature To1, and the pressure loss of the water supply W tends to increase. Become.

Therefore, at the control switching timing, the setting temperature Ts1 is switched to the low setting temperature Ts2, and the setting temperature Ts2 is switched to a temperature between the detection temperature To1 and the detection temperature Ti1 as a realizable temperature. For example, as the set temperature Ts2,
Ts2 = (To1 + Ti1) / 2 = (T1−α2 + Ti1) / 2
If it switches to, the flow rate ratio of A route and B route will be 50 [%].
As described above, in the control of switching from the set temperature Ts1 to Ts2, hot water supply control for controlling the mixing valve M1 can be used together while preventing hunting or the like so that the detected temperature Tm1 becomes a predetermined temperature.
Therefore, the set temperatures Ts1 and Ts2 are switched based on the detected temperature T1 of the heat medium ME1 of the heat storage tank 8, and the hot water supply by the hot water supply unit 4 and the hot water supply by the hot water supply unit 4 and the auxiliary heating unit 6 and the auxiliary heating unit 6 alone are performed. .
(1) When the feed water W can be heated to the set temperature Ts1 by the heat medium ME1: Hot water with the set temperature Ts1 can be provided only by the hot water supply unit 4 without using the auxiliary heating by the auxiliary heating unit 6.
(2) The detected temperature T1 of the heat medium ME1 is higher than the temperature of the water supply W, but when the water supply W can not be heated to the set temperature Ts1: Using the auxiliary heating by the auxiliary heating unit 6 together, hot water supply of the set temperature Ts1 is possible is there.

(3) When the detected temperature T1 of the heat medium ME1 is equal to the temperature of the water supply W, and even if heat exchange is performed from the heat medium ME1 to the water supply W, the water supply W can not be heated, that is, there is no heat storage in the heat medium ME1: It is possible to perform hot water supply of the set temperature Ts1 only by the auxiliary hot water supply unit 6 without using heating by the hot water supply unit 4. In this control, for example, the relationship between the feed water temperature and the minimum heat medium temperature shown in FIG. 7 may be used to switch between the above (1) and the above (2). In the above (3), the relationship of detection temperature of heat medium ≦ (water supply temperature + α2) may be used.
In such control, normally, the mixing valve M1 is controlled such that the outlet temperature of hot water becomes the set temperature Ts1, but when the outlet temperature at the set temperature Ts1 can not be reached under certain conditions, that is, heat storage of the heat medium ME1. The setting temperature Ts1 is switched to the low setting temperature Ts2, and the mixing ratio of the mixing valve M1 is forcibly changed by the setting temperature Ts2.

<Hot water control>
FIG. 3 shows the processing procedure of the hot water supply control of the hot water supply system 2.
The detected temperature of the heat medium ME1 is taken in (S11), and it is determined whether or not tapping is possible at the set temperature Ts1 based on the detected temperature (S12).
If tapping is possible at the set temperature Ts1 (YES in S12), the hot water HW having the set temperature Ts1 is generated by the control of the water amount adjustment unit 12 (S13). In this case, since the hot water HW having the set temperature Ts1 is supplied from the hot water supply unit 4, the auxiliary heating unit 6 does not shift to the auxiliary heating mode (YES in S17), and the hot water pipe 40 (FIG. 1) Hot water HW is obtained (S18).

If the hot water can not be obtained at the set temperature Ts1 (NO in S12), it is determined whether the detected temperature T1 of the heat medium ME1 is a temperature at which heat exchange with the feed water W is possible (S14). If the detected temperature T1 of the heat medium ME1 is a temperature at which heat exchange with the feed water W is possible (YES in S14), the current set temperature Ts1 is switched to the set temperature Ts2 and the heat exchanger 10 adjusted by the water amount adjustment unit 12 The amount of distribution of the water supply W flowing to the air is reduced from the time of tapping of the set temperature Ts1 (S15).
If the detected temperature T1 of the heat medium ME1 is a temperature at which heat exchange with the water supply W is not possible (NO in S14), the hot water supply unit 4 is allowed to flow from the hot water supply unit 4 to the auxiliary heating unit 6 (NO in S14) S16).
The auxiliary heating unit 6 determines whether the water supply W or the hot water HW flowing through the water supply pipe 30 is equal to or higher than the set temperature Ts1 (S17). If it is the set temperature Ts1 or more (YES in S17), hot water is supplied without performing the auxiliary heating (S18). If it is less than the set temperature Ts1 (NO in S17), the mode is shifted to the auxiliary heating mode, the water supply W or the warm water HW is heat exchanged with the heat of the heat medium ME2 to raise the temperature, and the hot water is supplied at the set temperature Ts1 (S19) ).

<Effect of one embodiment>
According to this embodiment, the following effects can be obtained.
(1) When the hot water HW having the set temperature Ts1 can not be obtained by the hot water supply unit 4, the set temperature Ts1 is switched to the low set temperature Ts2 to suppress the amount of water flowing to the heat exchanger 10 on the hot water supply unit 4 side. The pressure loss by 10 can be reduced.
(2) When the hot water HW having the set temperature Ts1 can not be obtained by the hot water supply unit 4, hot water HW heated to the set temperature Ts1 can be supplied by the auxiliary heating of the auxiliary heating unit 6.
(3) Since the amount of water supplied to the heat exchanger 10 is adjusted according to the heat storage, the utilization efficiency of the heat medium ME1 of the heat storage tank 8 is enhanced, and the stratification state on the heat storage tank 8 side is not disturbed.

FIG. 4 shows the hot water supply system according to the first embodiment. In FIG. 4, the same parts as in FIG. 1 are given the same reference numerals.
In the hot water supply system 2 of the first embodiment, a fuel cell unit 42, a hot water supply unit 44, and a backup hot water supply unit 46 are provided.
The fuel cell unit 42 is provided with a fuel cell 48, a heat exchanger 50 and a circulation pump 52. The fuel cell 48 is an example of a heat source, and uses heat generated during power generation as a heat source. The heat exchanger 50 exchanges the heat of the exhaust gas ME3 of the fuel cell 48 with the heat medium ME1 on the heat storage tank 8 side. The circulation pump 52 is installed in the circulation passage 54 of the heat medium ME1 and circulates the heat medium ME1 from the lower layer side of the heat storage tank 8 to the heat exchanger 50 at the time of driving. Return to the upper layer side.
At the time of power generation of the fuel cell 48, the circulation pump 52 is driven to circulate the heat medium ME1 from the lower layer side of the heat storage tank 8 to the heat exchanger 50, heat exchange heat of the exhaust ME3 to the heat medium ME1, and heated The medium ME1 is returned to the upper layer side of the heat storage tank 8. Thereby, stratified heat storage is performed in the heat storage tank 8. A temperature sensor 56 is installed on the inlet side of the heat exchanger 50, and the temperature of the heat medium ME1 on the lower side of the heat storage tank 8 is detected. A temperature sensor 58 is installed at the outlet side of the heat exchanger 50, and the temperature of the heat medium ME1 returned to the upper layer side of the heat storage tank 8 is detected.

The hot water supply unit 44 is provided with a plate heat exchanger 60 together with the heat storage tank 8. A heat pump 64 and a temperature sensor 22 are provided in the circulation path 62 for flowing the heat medium ME1 of the heat storage tank 8 to the plate heat exchanger 60. When the heat pump 64 is driven, the heat medium ME1 circulates from the upper layer portion of the heat storage tank 8 to the plate heat exchanger 60 and is returned to the lower layer side of the heat storage tank 8. The temperature sensor 22 detects the temperature of the heat medium on the upper layer side of the heat storage tank 8. A temperature sensor 66 installed in the heat storage tank 8 detects the temperature of the heat medium ME1 in the tank.
A water pipe or the like is connected to the water supply pipe 14, and the water supply W is supplied. The water supply pipe 14 is provided with a mixing valve 68, a water amount sensor 70, and a temperature sensor 72, and a hot water discharge pipe 18 is connected via the mixing valve 68 and the bypass pipe 16. The outlet pipe 18 is provided with a water control valve 74 and temperature sensors 76, 78. The bypass pipe 16 causes the water supply W diverted by the mixing valve 68 to flow to the hot water outlet pipe 18 side. The water control valve 74 controls the amount of the hot water HW or the water W supplied from the hot water outlet pipe 18. The temperature sensor 76 detects the temperature of the hot water at the outlet of the plate heat exchanger 60. The temperature sensor 78 detects the temperature of the warm water HW obtained by mixing the warm water HW and the feed water W.

The backup hot water supply unit 46 is provided with a plate heat exchanger 80 and a heat exchanger 82. The plate heat exchanger 80 is provided with a water supply pipe 30 on the inlet side and a hot water outlet pipe 40 on the outlet side thereof. The water supply pipe 30 is supplied with the water supply W or the warm water HW from the hot water supply unit 44 and provided with a temperature sensor 84, a water amount sensor 85, and a water control valve 86, and a mixing valve 88 for branching the bypass pipe 36 is connected. The temperature sensor 84 detects the temperature of the hot water HW or the water supply W flowing from the hot water supply unit 44. The water amount sensor 85 detects the water amount of the hot water HW or the water supply W flowing from the hot water supply unit 44, and the water control valve 86 controls the water amount.
The outlet pipe 40 is provided with temperature sensors 90, 92. The temperature sensor 90 detects the temperature of the hot water at the outlet of the plate heat exchanger 80. The temperature sensor 92 detects the temperature of the hot water HW obtained by mixing the water W supplied from the bypass pipe 36 or the hot water HW with the hot water HW on the hot water discharge pipe 40 side.
The plate heat exchanger 80 is provided with a circulation path 94 to circulate the heat medium ME2. The circulation path 94 is provided with a heat exchanger 82, a circulation pump 96, an open tank 98, and a temperature sensor 100. The circulation pump 96 circulates the heat medium ME2 to the circulation path 94 when driven. The plate heat exchanger 80 exchanges the heat of the heat medium ME2 with the feed water W or the hot water HW. The heat exchanger 82 exchanges heat from the combustion heat of the burner 102 with the heat medium ME2. The open tank 98 absorbs the volume fluctuation of the heat medium ME 2 circulating in the circulation path 94.

<Control Unit 20 of Hot Water Supply System 2>
FIG. 5 shows the control unit 20 (FIG. 1) of the hot water supply system 2. The control unit 20 includes a battery control unit 104, a hot water supply unit control unit 106, a backup control unit 108, and a remote control control unit 110. The battery control unit 104 controls the fuel cell unit 42. The hot water supply unit control unit 106 controls the hot water supply unit 44. The backup control unit 108 controls the backup hot water supply unit 46. The remote control control unit 110 is provided in the remote control device, and cooperates with the battery control unit 104, the hot water supply unit control unit 106, and the backup control unit 108 in a wired or wireless manner.
The battery control unit 104 includes a computer, and includes a processor 112, a memory unit 114, an input / output unit (I / O) 116, and a system communication unit 118. The processor 112 executes an OS (Operating System) and a battery control program in the memory unit 114. The memory unit 114 includes a ROM (Read-Only Memory) and a RAM (Random-Access Memory), and stores an OS and a battery control program. The system communication unit 118 exchanges control data with the remote control control unit 110, the system communication unit 126 of the hot water supply unit control unit 106, and the system communication unit 134 of the backup control unit 108. The temperatures detected by the temperature sensors 56 and 58 are input to the I / O 116 as control information, and the control output of the circulation pump 52 is obtained.

The hot water supply unit control unit 106 is configured by a computer, and includes a processor 120, a memory unit 122, an input / output unit (I / O) 124, and a system communication unit 126. The processor 120 executes the OS and the hot water supply control program in the memory unit 122. The memory unit 122 includes a ROM, an EEPROM (Electrically Erasable Programmable Read-Only Memory) and a RAM, and stores an OS and a hot water supply control program. The system communication unit 126 exchanges control data with the remote control control unit 110, the system communication unit 118 of the battery control unit 104, and the system communication unit 134 of the backup control unit 108. The detection temperatures of the temperature sensors 22, 66, 72, 76, 78 and the amount of water detected by the water amount sensor 70 are input to the I / O 124 as control information, and control outputs of the heat pump 64 and the mixing valve 68 are obtained.
The backup control unit 108 is configured by a computer, and includes a processor 128, a memory unit 130, an input / output unit (I / O) 132, and a system communication unit 134. The processor 128 executes the OS and backup control program stored in the memory unit 130. The memory unit 130 includes a ROM, an EEPROM, and a RAM, and stores an OS and a backup control program. The system communication unit 134 exchanges control data with the remote control control unit 110, the system communication unit 118 of the battery control unit 104, and the system communication unit 126 of the hot water supply unit control unit 106. The detection temperatures of the temperature sensors 84, 90, 92, and 100, and the amount of water detected by the water amount sensor 85 are input to the I / O 132 as control information, and control outputs of the circulation pump 96, water control valve 86 and mixing valve 88 are obtained. Be

<Heating water control by heat medium ME1>
A in FIG. 6 shows the relationship between the feed water temperature and the minimum heat medium temperature when the hot water supply set temperature (hereinafter referred to as “set temperature Ts1”) is 35 ° C. FIG. 6 B shows that the set temperature Ts1 is 40 ° C. C in FIG. 6 shows the relationship between the feed water temperature and the minimum heat medium temperature when the set temperature Ts1 is 45 ° C.].
From these relationships, FIG. 7 shows a relationship graph of the feed water temperature and the minimum heat medium temperature with the set temperature Ts1 as a parameter. In FIG. 7, A is a set temperature Ts1 = 35 ° C., B is a set temperature Ts1 = 40 ° C., and C is a set temperature Ts1 = 45 ° C.
From this relationship, for example, if the feed water temperature is 15 ° C. and the set temperature Ts1 is 40 ° C., the minimum heat medium temperature needs to be 60.6 ° C.

<When the hot water of the set temperature Ts1 is available by the heat medium ME1>
A of FIG. 8 shows an operation when the hot water supply unit 44 can perform the hot water supply of the set temperature Ts1 with the heat medium ME1. In A of FIG. 8, thick lines indicate the flows of the water supply W, the hot water HW, and the heat medium ME1.
When it is possible to supply water at the set temperature Ts1 with the heat medium ME1, in the hot water supply unit 44, the detected temperature To1 (temperature after heat exchange) of the temperature sensor 76 is a value (Ts1 + 6 [° C] higher by 6 ° C. than the set temperature Ts1, for example. ] (The first target temperature of heat exchange), the rotation speed of the heat pump 64 is controlled. The opening degree of ports a and b of the mixing valve 68 is controlled so that the detected temperature Tm1 of the temperature sensor 78 becomes the set temperature Ts1.

  At this time, in the backup hot water supply unit 46, since the detected temperature Ti2 of the temperature sensor 84 becomes equal to or higher than the set temperature Ts1, the mixing valve 88 controls the port d side to an open degree of 100%. Since the burner 102 does not burn, the mixing valve 88 has no water flow on the port c side. For example, when the set temperature Ts1 = 40 ° C. and the detected temperature Ti1 of the temperature sensor 72 = 20 ° C., the ratio of the flow rate on the port a side of the mixing valve 68 and the flow rate on the port b side is a: b = 77 : 23. In the mixing valve 88 of the backup hot water supply unit 46, the water amount on the port d side is 100%. That is, when hot water of the set temperature Ts1 can be supplied by the heat medium ME1, 77% of the total amount of water flowing to the hot water supply system 2 flows to the heat exchanger 60, and 23% of the total amount of water flows to the bypass pipe 16. Flow. As a result, 77% of the total amount of water is affected by the heat exchanger 60.

<When the hot water of the set temperature Ts1 can not be generated by the heat medium ME1>
B of FIG. 8 shows the hot water supply operation when the hot water supply unit 44 can not perform the hot water supply of the set temperature Ts1 with the heat medium ME1. In B of FIG. 8, thick lines indicate the flows of the water supply W, the hot water HW, and the heat mediums ME1 and ME2.
In this case, the rotational speed control of the heat pump 64 is performed so that the detected temperature To1 = (T1-5 [° C.]). When the target temperature of the detection temperature Tm1 is the normal set temperature Ts1, the flow rate ratio of the a route increases with the decrease of the detection temperature To1, and finally the total amount of water is affected by the heat exchanger 60. Therefore, the target temperature of the detection temperature Tm1 is set to a temperature at which the mixing of the a route and the b route of the mixing valve 68 is performed. That is, the set temperature Ts1 is changed to the set temperature Ts2 (<Ts1) with respect to the detected temperature Tm1. The set temperature Ts2 may be a temperature lower than the set temperature Ts1, and for example, if controlled to To1 = (T1-5 [° C.]), first, the set temperature Ts2 = (Ti1 + (T1-5) Assuming that the target temperature) / 2) is the target temperature, the degree of opening of the mixing valve 68 is adjusted, and the flow rate of 50% is obtained at each of the ports a and b. As a result, it is possible to reduce the pressure loss due to the water supply W flowing to the a route side.

Second, if the target temperature is set closer to the detected temperature Ti1 as in the set temperature Ts2 = (Ti1 + Ti1 + (T1-5)) / 3, the flow rate flowing to the b route side of the mixing valve 68 can be increased. Thus, the pressure loss of the feed water W flowing to the a route can be further reduced.
As described above, it is not necessary to change the control mode of the mixing valve 68 only by changing the set temperature Ts1 to the set temperature Ts2. Therefore, no software redesign is required.
In this case, on the side of the backup hot water supply unit 46, the circulation pump 96 is driven to burn the burner 102, and the detected temperature Tj is controlled to 80 ° C. Since the detected temperature Ti2 is lower than the set temperature Ts1, the detected temperature To2 is mixed with the detected temperature To2 ≒ 80 [° C.], and the opening degree control of the mixing valve 88 is performed so that the detected temperature Tm2 becomes the set temperature Ts1.
At this time, since the detected temperature Ti2 is closer to the set temperature Ts1 than the detected temperature To2, the port c side flow rate and the port d side flow rate of the mixing valve 88 become the port c side flow rate <port d side flow rate.

For example, in the case where the set temperature Ts1 = 40 ° C. and the detection temperature Ti1 = 20 ° C., if the detection temperature T1 = 40 ° C., the detection temperature To1 = 35 ° C. is obtained.
Here, the set temperature Ts2 is
(Ti1 + T1-5) / 2 = (20 + 35) /2=27.5 [° C.]
If the target temperature of the detection temperature Tm1 is changed from the setting temperature Ts1 to the setting temperature Ts2, the a side flow rate and the b side flow rate of the mixing valve 68 become the a side flow rate: b side flow rate 50:50, and the detection temperature Tm1 It will be set to 27.5 [degreeC].
Since the detection temperature Ti2 is 27.5 ° C., it is mixed with the warm water HW at the detection temperature To2 〔80 ° C., and the detection temperature Tm2 is controlled to 40 ° C. The port d side flow rate is port c side flow rate: port d side flow rate ≒ 24: 76. Therefore, 50% of the total amount of water is affected by the heat exchanger 60, and approximately 24% of the total amount of water is affected by the heat exchanger 80. Thereby, the pressure loss by the heat exchangers 60 and 80 is reduced.

<Case where heat exchange with the heat medium ME1 is not possible>
C in FIG. 8 shows the operation in the case where heat exchange with the heat medium ME1 is not possible. In C of FIG. 8, thick lines indicate the flows of the water supply W and the heat medium ME2.
If the heat exchange by the heat medium ME1 is not possible, the heat storage unit 44 has low heat storage and can not use it for heat exchange for hot water supply, so the mixing valve 68 is controlled to flow 100% of the water supply W to the port b side. , The heat pump 64 is in a stop state. In this case, the detection temperature Tm1 becomes the detection temperature Ti1.

In the backup hot water supply unit 46, the circulation pump 96 is driven to burn the burner 102, and the detected temperature Tj is controlled to 80 ° C.
Since the detected temperature Ti2 is less than the set temperature Ts1, it is mixed with the warm water HW having the detected temperature To2 ≒ 80 ° C., and the degree of opening of the mixing valve 88 is controlled so that the detected temperature Tm2 becomes the set temperature Ts1.
Since the detected temperature Ti2 is closer to the set temperature Ts1 than the detected temperature To2, the ratio of the port c side flow rate of the mixing valve 88 to the port d side flow rate is: port c side flow rate <port d side flow rate.

For example, at the set temperature Ts1 = 40 ° C. and the detection temperature Ti1 = 20 ° C., if the detection temperature T1 = 20 ° C., the heat pump 64 is stopped.
At this time, the ratio between the port a side flow rate and the port b side flow rate of the mixing valve 68 is port a side flow rate: port b side flow rate = 0: 1. At this time, 100% of the total flow rate flows to the port b side.
Since the detection temperature Ti2 = Tm1 = Ti1 = 20 [° C], mixing with the detection temperature To2 〔80 [° C] and controlling the detection temperature Tm2 to the set temperature Ts1 = 40 [° C], the flow on the port c side of the mixing valve 88 The ratio of the port d side flow rate is: port c side flow rate: port d side flow rate 1: 2 1: 2.
Therefore, one third of the total amount of water is affected by the heat exchanger 80, and no pressure loss due to the heat exchanger 60 occurs.

<Control of Hot Water Supply System 2>
FIG. 9 shows a processing procedure of control of the hot water supply system 2. The control includes the respective controls of the remote control control unit 110, the battery control unit 104, the hot water supply unit control unit 106 and the backup control unit 108, and the respective controls are executed in cooperation with each other.
After initialization (S101), the remote control control unit 110 repeatedly executes input acceptance processing (S102) and display output processing (S103). In the display output process, status information obtained by the battery control unit 104, the hot water supply unit control unit 106, or the backup control unit 108 is displayed on an LCD (Liquid Crystal Display).

After initialization (S104), the battery control unit 104 receives ON / OFF of the operation switch by the input acceptance process (S102), shifts to the heat recovery process (S105) shown in FIG. 10, and is obtained by this heat recovery process The information is provided to the remote control unit 110.
After initialization (S106), the hot water supply unit control unit 106 receives an instruction of the set temperature Ts1 in the input acceptance process (S102), shifts to the hot water supply process (S107) shown in FIG. It is provided to the remote control unit 110.
After initialization (S108), the backup control unit 108 receives an instruction of the set temperature Ts1 in the input acceptance process (S102), shifts to the backup hot water supply process (S109) shown in FIG. 12, and obtains status information obtained by the backup hot water supply process. Are provided to the remote control unit 110.

<Heat recovery process>
FIG. 10 shows a processing procedure of heat recovery processing by the battery control unit 104. In this processing procedure, the operation of the operation switch of the input acceptance processing (S102) of the remote control unit 110 is monitored (S201), and if the operation switch = ON (YES in S201), the fuel cell 48 is driven (S202), The rotation of the circulation pump 52 is controlled such that the output temperature of the temperature sensor 58 is, for example, 75 ° C. (S203).
If the operation switch = OFF (NO at S201), the fuel cell 48 is stopped (S204), and the circulation pump 52 is stopped (S205).

<Hot water supply process>
FIG. 11 shows the processing procedure of the hot water supply process of the hot water supply unit 44. In this processing procedure, it is determined whether or not hot water use is used (S301), and if it is not hot water use (NO in S301), the heat pump 64 is stopped (S302), and this process is ended.
If it is hot water use (YES in S301), it is determined whether the detected temperature T1 is equal to or higher than a temperature at which the set temperature Ts1 can be supplied (S303). If the detected temperature T1 is equal to or higher than the temperature at which the set temperature Ts1 can be supplied (YES in S303), the hot water supply process shown in A of FIG. 8 is executed (S304). In this process, the rotation of the heat pump 64 is controlled so that the detected temperature To1 becomes a temperature (= the set temperature Ts1 + ΔT1) higher than the set temperature Ts1 by, for example, 6 ° C. (S305). The opening degree of the mixing valve 68 is controlled so that Tm1 becomes the set temperature Ts1 (S306).

If the detected temperature T1 is not higher than the temperature at which the set temperature Ts1 can be supplied (NO in S303), the detected temperature T1 exceeds the temperature (= water supply temperature + ΔT2) higher than the water supply temperature by a constant temperature ΔT2, for example, 5 ° C. It is determined whether it is (S307). If the detected temperature T1 exceeds the temperature (= water supply temperature + ΔT2) (YES in S307), the hot water supply process shown in B of FIG. 8 is executed (S308).
In this process, the rotation of the heat pump 64 is controlled such that the detected temperature To1 becomes a temperature (= T1 temperature-ΔT2) lower than the detected temperature T1 by a constant temperature ΔT2, for example, 5 ° C. (S309) A target temperature of temperature Tm1 is calculated (S310).
In this process, the target temperature is calculated from the detected temperature To1 (= T1−ΔT2) and the detected temperature Ti1 of the water supply W. For example, the first target temperature may be (To1 + Ti1) / 2, or the second target temperature may be (To1 + Ti1 + Ti1) / 3.
And control of the mixing valve 68 is performed so that one of these target temperature may be obtained (S311).

  If the detected temperature T1 is less than or equal to the temperature (= feed water temperature + ΔT) in S307 (NO in S307), the process shown in C of FIG. 8 is performed (S312). In this process, the heat pump 64 is stopped (S313), and the mixing valve 68 is controlled so that 100% of flowing water can be obtained at the port b (S314).

<Backup hot water supply process>
FIG. 12 shows the processing procedure of the backup hot water supply processing. In this processing procedure, it is determined whether the hot water supply is used (S801). This determination may be made based on the amount of water detected by the water amount sensor 85.
If it is not the hot water supply use (NO in S801), the hot water supply operation is stopped (S802), and the backup hot water supply process is ended.
If it is the hot water supply use (YES in S801), it is determined whether the detected temperature Ti2 is lower than the set temperature Ts1 (S803). If the detected temperature Ti2 is lower than the set temperature Ts1 (YES in S803), the process shifts to feedwater heating, and the circulation pump 96 is operated at a rotational speed according to the required heat amount (S804). At this time, the combustion of the burner 102 is controlled such that the detected temperature Tj becomes a predetermined temperature, for example, 80 ° C. (S805). At the same time, the opening degree ratio of the mixing valve 88 is controlled so that the detected temperature Tm2 becomes equal to the set temperature Ts1 (S806).
If the detected temperature Ti2 is equal to or higher than the set temperature Ts1 (NO in S803), the heating operation is stopped, and the opening degree ratio of the mixing valve 88 is controlled so that the amount of water 100% on the port d side.

<Relationship between heat exchanger side flow ratio and pressure loss>
FIG. 13 shows the relationship of the pressure loss to the flow rate ratio on the heat exchanger 60 side. The relationship of this pressure loss is the case of flowing 16 [l / min] as the total flow rate. From this relationship, as the flow rate increases, the pressure loss also increases quadratically. Even when the flow rate is 0%, the pressure loss is caused by the pressure loss on the common path and the bypass pipe 16 side because the measurement is performed between the water supply port and the hot water supply port of the hot water supply unit 44. It is for.
Such a relationship is a characteristic of the heat exchanger 60, but the heat exchanger 80 on the side of the backup hot water supply unit 46 also has the same tendency as long as the heat exchanger 60 has the same specifications.

<Effect of Example 1>
According to the first embodiment, the following effects can be obtained.
(1) The heat quantity can be used for hot water supply according to the heat storage of the heat storage tank 8.
(2) If the heat storage is low and it can not be used for hot water supply, the water supply W passed through the hot water supply unit 44 is heated to the set temperature Ts1 by the backup hot water supply unit 46, and hot water supply at the set temperature Ts1 is possible.
(3) Although it is not possible to raise the temperature of the feed water W up to the set temperature Ts1, in heat storage capable of exchanging heat to a certain degree, the amount of feed water flowing to the heat exchanger 60 is suppressed to reduce pressure loss and rotate the heat pump 64 The number can be reduced and efficient heat storage utilization can be achieved.

(4) When the heat storage is low, forced heat medium circulation can be avoided, and the stratification state of the heat storage tank 8 will not be disturbed.
(5) The opening ratio of the mixing valve 68 and the flow ratio are generally not in a proportional relationship. This is because the port side where the pressure loss is high becomes difficult to flow. It is assumed that the flow rate ratio on the heat exchanger 60 side decreases when the flow rate is small in the opening degree control. In other words, assuming such a phenomenon, the utilization factor of the heat storage of the heat storage tank 8 decreases, but in such control, the flow rate flowing to the heat exchanger 60 side is compensated, and the heat storage can be effectively used.

  FIG. 14 shows a hot water supply system according to a second embodiment. In the first embodiment, the heat storage tank 8 is installed in the hot water supply unit 44. However, as shown in FIG. 15, the heat storage tank 8 is removed from the hot water supply unit 44, and the tank unit 43 including the heat storage tank 8 and the heat storage tank 8 are removed. The same control is possible even when configured with the hot water supply unit 45.

FIG. 15 shows a hot water supply system according to a third embodiment. In the second embodiment, the hot water supply unit 45 and the backup hot water supply unit 46 are separately configured, but as shown in FIG. 16, similar control can be performed even if the hot water supply unit 47 and the hot water supply unit 47 are integrated. It is possible.

  Although the hot water supply unit 44 and the backup hot water supply unit 46 are independent in the above embodiment, the hot water supply unit 44, the backup hot water supply unit 46 and each control unit may be integrated as a hot water supply apparatus.

Other Embodiments
(1) In the above embodiment, the water amount adjustment unit 12 is provided with the mixing valve M1, and the water amount adjustment unit 38 is provided with the mixing valve M2. However, the bypass pipe 16 is provided with a proportional valve You may adjust.
(2) Although the fuel cell 48 is illustrated as a heat source of the heat medium ME1, an exhaust heat source such as an engine may be used.
(3) Although the burner 102 is used as a heat source of the heat medium ME2, another heat source such as electric heat may be used.
(4) The memory units 122 and 130 may be provided with storage units for storing the set temperatures Ts1 and Ts2 individually.
(5) In the above embodiment, when the setting temperature Ts1 is switched to the setting temperature Ts2, the hot water HW having the setting temperature Ts1 is discharged from the auxiliary heating unit 6, but the invention is not limited thereto. Hot water HW having a temperature higher or lower than the set temperature Ts1 may be discharged from the auxiliary heating unit 6.
(6) With regard to control of the outlet temperature, the outlet temperature may be controlled to the set temperature Ts1 using the detected temperature of the temperature sensor 24, or the outlet temperature may be controlled to the set temperature Ts1 using the detected temperature of the temperature sensor 92. May be In the latter case, when the piping from the hot water supply units 44, 45 to the backup hot water supply unit 46 is long, the temperature decrease of the hot water HW from the hot water supply units 44, 45 can be backed up by auxiliary heating of the backup hot water supply unit 46.

As described above, the most preferable embodiments and the like of the present invention have been described. The present invention is not limited to the above description. Various modifications and changes can be made by those skilled in the art based on the subject matter of the invention described in the claims or disclosed in the mode for carrying out the invention. It goes without saying that such variations and modifications are included in the scope of the present invention.

  According to the present invention, exhaust heat is stored by the heat medium, and the hot water supply control is performed according to the heat storage of the heat medium. In this hot water supply control, the amount of water flowing to the heat exchanger is controlled according to the heat storage. When it is low, by reducing the amount of water flowing to the heat exchanger, pressure loss and power loss for circulation can be reduced, and excellent effects such as disturbance of stratified heat storage of the heat storage tank can be obtained, which is beneficial. It is.

Reference Signs List 2 hot water supply system 4 hot water supply unit 6 auxiliary heating unit 8 heat storage tank 10 heat exchanger 12 water amount adjustment unit 14 water supply pipe 16 bypass pipe 18 outlet pipe 20 control unit 22 temperature sensor 24 temperature sensor 26 28 heat exchanger 30 water supply pipe 32 temperature Sensor 34 heat source 36 bypass pipe 38 water quantity adjustment unit 40 hot water supply pipe 42 fuel cell unit 44, 45, 47 hot water supply unit 46 backup hot water supply unit 48 fuel cell 50 heat exchanger 52 circulation pump 54 circulation path 56, 58 temperature sensor 60 plate heat exchange 62 Circuit 64 Heat pump 66 Temperature sensor 68 Mixing valve 70 Water flow sensor 72 Temperature sensor 74 Water control valve 76, 78 Temperature sensor 80 Plate heat exchanger 82 Heat exchanger 84 Temperature sensor 85 Water flow sensor 86 Water control valve 88 Miki Valve 90, 92 temperature sensor 94 circulation path 96 circulation pump 98 open tank 100 temperature sensor 102 burner 104 battery control unit 106 hot water supply unit control unit 108 backup control unit 110 remote control control unit 112, 120, 128 processor 114, 122, 130 memory Parts 116, 124, 132 Input / output part (I / O)
118, 126, 134 System communication unit

Claims (7)

A hot water supply system comprising: a heat storage tank for storing a heat medium; and a heat exchanger for exchanging heat of the heat medium to water supply,
A temperature sensor for detecting the temperature of the heat medium circulating in the heat exchanger;
Water amount adjusting means for distributing the water supply to the heat exchanger and the bypass, and adjusting the amount of distribution of the water supplied to the heat exchanger and the bypass;
A pump for circulating a heat medium which exchanges heat with the water supply from the heat storage tank to the heat exchanger through a circulation path;
It is judged from the detected temperature of the heat medium whether the hot water can be discharged at the first set temperature, and when the hot water can not be discharged at the first set temperature, the temperature is switched to a second set temperature lower than the first set temperature A control unit configured to reduce the distribution amount of the water supplied to the heat exchanger adjusted by the water amount adjusting means from the time when the first set temperature is discharged;
Hot water supply system characterized by having. A hot water supply unit that converts the water supply into hot water and discharges it by the heat exchanger;
An auxiliary heating unit that heats the hot water to the first set temperature or another temperature to discharge the hot water if the outlet temperature of the hot water supply unit is less than the first set temperature;
The hot water supply system according to claim 1, comprising: A hot water supply control program to be realized on a computer,
A function of acquiring the detected temperature from a temperature sensor that detects the temperature of the heat medium circulating in the heat exchanger;
A function of controlling the distribution amount of water amount adjusting means for distributing the water supply to the heat exchanger and the bypass, and adjusting the distribution amount of the water supplied to the heat exchanger and the bypass;
A function of controlling a pump that circulates a heat medium, which exchanges heat with the water supply, from the heat storage tank to the heat exchanger through a circulation path;
It is judged from the detected temperature of the heat medium whether the hot water can be discharged at the first set temperature, and when the hot water can not be discharged at the first set temperature, the temperature is switched to a second set temperature lower than the first set temperature A function of reducing the distribution amount of the water supplied to the heat exchanger adjusted by the water amount adjusting means compared to when the first set temperature is being discharged;
A hot water supply control program for making the computer realize. A heat supply control method using a heat storage tank for storing a heat medium and a heat exchanger for exchanging heat of the heat medium to feed water,
Detecting the temperature of the heat medium circulating in the heat exchanger;
Distributing the feed water to the heat exchanger and the bypass passage by means of a water amount adjustment means, and adjusting the amount of distribution of the feed water to be flowed to the heat exchanger and the bypass passage;
Circulating a heat medium, which exchanges heat with the water supply, from the heat storage tank to the heat exchanger through a circulation path;
Determining whether the hot water can be discharged at the first set temperature according to the temperature of the heat medium;
When hot water can not be discharged at the first set temperature, the distribution amount of the water supplied to the heat exchanger adjusted by the water amount adjustment unit is switched to a second set temperature lower than the first set temperature, and Reducing the temperature at the time of tapping the first set temperature;
A method for controlling hot water supply comprising: Further, the step of converting the feed water into hot water and discharging the hot water by the heat exchanger;
Heating the hot water to the first set temperature or another temperature to discharge the hot water if the outlet temperature is less than the first set temperature;
The hot-water supply control method according to claim 4, further comprising: A hot water supply apparatus comprising: a heat storage tank for storing a heat medium; and a heat exchanger for exchanging heat of the heat medium to water supply,
A temperature sensor for detecting the temperature of the heat medium circulating in the heat exchanger;
Water amount adjusting means for distributing the water supply to the heat exchanger and the bypass, and adjusting the amount of distribution of the water supplied to the heat exchanger and the bypass;
A pump for circulating a heat medium which exchanges heat with the water supply from the heat storage tank to the heat exchanger through a circulation path;
It is judged from the detected temperature of the heat medium whether the hot water can be discharged at the first set temperature, and when the hot water can not be discharged at the first set temperature, the temperature is switched to a second set temperature lower than the first set temperature A control unit configured to reduce the distribution amount of the water supplied to the heat exchanger adjusted by the water amount adjusting means from the time when the first set temperature is discharged;
A hot water supply apparatus comprising: The water heater or the hot water from the water heater according to claim 6, provided separately or integrally with the water heater according to claim 6, and the outlet temperature of the water heater is less than the first setting temperature. An auxiliary heating unit that is heated to the temperature of
A hot water supply apparatus characterized by comprising.

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