JP2019052827A - Hot water supply system, hot water supply control method and water heater - Google Patents

Abstract

To enhance heat storage use efficiency and reduce pressure loss to enable efficient hot water supply.SOLUTION: A hot water supply system includes: a thermal storage tank (8) for storing a heating medium (ME1); a heat exchanger (10) for exchanging heat of the heating medium with supply water; a temperature sensor (22) for detecting a temperature of the heating medium circulating in the heat exchanger; water amount control means (water amount control section 12) for distributing the supply water to the heat exchanger and a bypass passage (bypass pipe 16) and controlling the distribution amount of the supply water caused to flow in the heat exchanger and the bypass passage; a pump (9) for circulating the heating medium in the thermal storage tank to the heat exchanger through a circulation passage; and a control section (20) that determines whether hot water delivery at a set temperature is possible based on a detection temperature of the heating medium, controls the distribution amount of the supply water caused to flow in the heat exchanger and the bypass passage by the water amount control means to a fixed value or releases water flowing in the heat exchanger when hot water supply at the set temperature cannot be performed, and controls the heating medium circulation in the heat exchanger to a target temperature set lower than the detection temperature of the heating medium only by a predetermined temperature.SELECTED DRAWING: Figure 1

Description

The present invention relates to a heat exchanger control technique for exchanging heat from a heat storage tank heat supply to feed water.

Exhaust heat is exchanged with a heat medium, and the heat medium is stored in a heat storage tank to store heat. In this heat storage tank, a so-called hierarchical heat storage system is employed in which a low-temperature heat medium is heated from the lower layer side, and the temperature rises to return to the upper layer side of the heat storage tank so as to have an upward gradient from the lower layer side to the upper layer side. The use of heat storage from a heat storage tank using such a heat storage system is performed by taking out a heat medium from the upper layer side and exchanging heat with hot water.
With regard to such heat exchange, when the heat medium of the heat storage tank is heat-exchanged to the feed water, an insufficient amount of heat is generated when the feed water is heated to the set temperature depending on the heat storage amount of the heat storage tank. It is known that this insufficient heat quantity is compensated by an auxiliary heating source, and the hot water temperature is raised to a set temperature (Patent Document 1).

JP 2011-214793 A

By the way, the technique of patent document 1 can utilize efficiently the heat storage of a heat storage tank for feed water heating, The practicality is highly evaluated.
However, even if there is little heat storage in the heat storage tank, if it is intended to use it for heating the feed water, the circulation amount of the heat medium will be increased to the limit with respect to the feed water flowing through the heat exchanger. In such control, in a heat exchanger, for example, a plate heat exchanger, the water supply passage is narrow and the pressure loss cannot be ignored.
Moreover, disturbing the stratified state of the tiered heat storage in the heat storage tank has the problem of reducing the heat storage utilization efficiency even if the heat exchange efficiency is high.
In view of the above problems, an object of the present invention is to increase the efficiency of heat storage and reduce pressure loss to realize 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 including a heat storage tank that stores a heat medium, and a heat exchanger that exchanges heat of the heat medium with water. A temperature sensor that detects the temperature of the heat medium circulating in the heat exchanger, and a water amount that distributes the feed water to the heat exchanger and the bypass passage, and adjusts a distribution amount that flows to the heat exchanger and the bypass passage of the feed water When adjusting means, a pump that circulates the heat medium in the heat storage tank to the heat exchanger through a circulation path, and determining whether hot water can be discharged at a set temperature based on the detected temperature of the heat medium, and hot water supply at the set temperature is not possible, The distribution amount of the water supplied to the heat exchanger and the bypass passage is controlled to a fixed value by the water amount adjusting means, or the water flow of the heat exchanger is canceled, and is lower than the detected temperature of the heat medium by a predetermined temperature. Warm By setting the target temperature of the heat exchanger comprises a control unit for controlling the pump.
In this hot water supply system, the control unit further controls the heat exchange temperature of the heat exchanger from the preset temperature to a temperature higher than the preset temperature by heat exchange when the hot water can be discharged at the preset temperature, When hot water is not available, the heat exchange temperature of the heat exchanger may be controlled to a temperature that is lower than the detected temperature of the heat medium by a predetermined temperature.
In this hot water supply system, a hot water supply unit that generates hot water using the heat exchanger and outputs hot water, and auxiliary heating that heats the hot water to a set temperature and discharges the hot water if the hot water temperature of the hot water supply unit is lower than the set temperature. May be provided.

In order to achieve the above object, according to one aspect of the hot water control method of the present invention, there is provided a hot water control method using a heat storage tank for storing a heat medium and a heat exchanger for exchanging heat of the heat medium with water. A step of detecting the temperature of the heat medium circulating in the heat exchanger, and distributing water supply to the heat exchanger and the bypass passage by a water amount adjusting means, and flowing the water supply to the heat exchanger and the bypass passage A step of adjusting the amount, a step of circulating the heat medium of the heat storage tank to the heat exchanger through a circulation path, a step of determining whether hot water can be discharged at a set temperature based on the temperature of the heat medium, and hot water supply at a set temperature If it is not possible to control the distribution amount of the feed water flowing through the heat exchanger and the bypass passage to a fixed value by the water amount adjusting means, or cancel the water flow of the heat exchanger, from the detected temperature of the heat medium Low by predetermined temperature And controlling a heat medium circulation to the target temperature set on the temperature.
In this hot water supply control method, when the hot water can be discharged at the set temperature, the step of controlling the heat exchange temperature of the heat exchanger to a temperature higher than the set temperature by a heat exchange by the heat exchange, If not possible, the method may include a step of controlling the heat exchange temperature of the heat exchanger to a temperature lower than the detected temperature of the heat medium by a predetermined temperature.
The hot water supply control method further includes a step of generating hot water using the heat exchanger and discharging the hot water, and a step of heating the hot water to the set temperature and discharging the hot water if the hot water temperature is lower than the set temperature. Good.

According to one aspect of the hot water supply apparatus of the present invention, the hot water supply apparatus includes a heat storage tank that stores a heat medium and a heat exchanger that exchanges heat of the heat medium with water, and the heat exchanger circulates to the heat exchanger. A temperature sensor for detecting the temperature of the heat medium, water supply adjusting means for distributing the supply water to the heat exchanger and the bypass passage, and adjusting a distribution amount of the supply water flowing to the heat exchanger and the bypass passage, and the heat storage tank A pump that circulates the heating medium to the heat exchanger through a circulation path, and whether the hot water can be discharged at a set temperature is determined based on the detected temperature of the heating medium. The distribution amount of the feed water flowing through the exchanger and the bypass passage is controlled to a fixed value, or the water flow of the heat exchanger is canceled, and the heat exchanger has a temperature lower than the detected temperature of the heat medium by a predetermined temperature. Set target temperature A control unit for controlling the pump Te.
This hot water supply apparatus may be provided separately or integrally with the hot water supply apparatus, and may include an auxiliary heating unit that heats the hot water to the set temperature and discharges the hot water if the hot water temperature is lower than the set temperature.

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

(1) Even when the heat storage in the heat storage tank does not reach the amount of heat necessary for hot water at the set temperature, the heat medium in the heat storage tank is used, so that the heat medium heat amount can be effectively used.
(2) When the heat storage in the heat storage tank does not reach the amount of heat required for 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 in the heat exchanger, a circulation pump is generally used. However, since the amount of circulation can be reduced, the number of revolutions of the circulation pump can be reduced, and power consumption can be suppressed.
(4) If the heat storage in the heat storage tank does not reach the amount of heat required for hot water at the set temperature, the amount of heat medium used in the heat storage tank will be reduced, so the heat medium heat quantity will not be disturbed. Can be used efficiently.

It is a figure which shows the hot water supply system which concerns on one embodiment. It is a flowchart which shows an example of the hot water supply control method. 1 is a diagram illustrating a hot water supply system according to Embodiment 1. FIG. It is a block diagram which shows a control system. A is a table showing the feed water temperature, hot water temperature, amount of heat exchange, and minimum heat transfer medium temperature when hot water set temperature = 35 [° C.], and B is the feed water temperature, hot water when hot water set temperature = 40 [° C.] is obtained. C is a table showing the temperature, the amount of heat exchange, and the minimum heat transfer medium temperature, and C is a table showing the water supply temperature, the hot water temperature, the amount of heat exchange, and the minimum heat transfer temperature when obtaining the hot water supply set temperature = 45 [° C.]. It is a figure which shows the minimum heat-medium temperature with respect to feed water temperature at the time of setting temperature as a parameter. It is a figure for demonstrating the hot water supply operation | movement corresponding to heat storage. It is a figure which shows a hot-water supply circuit when heat storage is low. It is a figure which shows the process sequence of a hot water supply system comprehensively. It is a flowchart which shows the process sequence of a fuel cell unit. It is a flowchart which shows the process sequence of a hot water supply unit. A is a flowchart showing the control of the mixing valve, and B is a flowchart showing the control of the mixing valve. It is a flowchart which shows control of a mixing valve. It is a flowchart which shows the process sequence of a backup hot-water supply unit. It is a figure which shows the hot water supply system which concerns on Example 2. FIG. 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 exchanges heat of the heat medium ME1 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 hot water HW from the hot water supply unit 4 is a set temperature, the hot water HW is discharged as it is, and if it is lower than the set temperature, the temperature is raised to the set temperature by auxiliary heating, and the set temperature hot water HW Take out the hot water.

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 stores heat by the heat medium ME1. The heat medium ME1 taken out from the lower layer side of the heat storage tank 8 is circulated and heated to a heat source side (not shown), and the heated heat medium ME1 is returned to the upper layer side of the heat storage tank 8. Thereby, heat storage is performed in the heat storage tank 8 in a stratified state rising from the lower layer toward the upper layer.
The pump 9 is operated when the heat of the heat medium ME1 is exchanged with the feed water W, and the heat medium ME1 is circulated through the heat exchanger 10.
For example, a plate heat exchanger is used as 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 to the heat exchanger 10 through the circulation path 13 by operating the pump 9, and after heat exchange, the lower layer of the heat storage tank 8 Back to the side.
The water amount adjusting unit 12 is an example of a water amount adjusting unit of the heat exchanger 10, distributes the water supply W to the heat exchanger 10 and a bypass pipe 16 that is an example of a bypass path, 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 outlet side bypass pipe 16 to the hot water discharge pipe 18. In the water amount adjusting unit 12, the control unit 20 is provided with a mixing valve M <b> 1 whose opening degree is controlled, and the distribution amount of the water supply W flowing through the heat exchanger 10 and the bypass pipe 16 is adjusted.

The temperature of the heat medium ME 1 circulating 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 hot water HW of the tap water pipe 18 with the feed water W of the bypass pipe 16 is detected by the temperature sensor 24.
The control unit 20 determines whether the hot water can be discharged at the set temperature based on the detected temperature of the heat medium ME1, and when the hot water cannot be supplied at the set temperature, the distribution amount of the water supplied to the heat exchanger 10 and the bypass pipe 9 by the water amount adjusting unit 12 Is controlled to a fixed value or the water flow of the heat exchanger 10 is canceled. At this time, the target temperature for heat exchange of the heat exchanger 10 is set to a temperature lower than the detected temperature of the heat medium ME1 by a predetermined temperature, and the pump 9 is controlled. Therefore, the hot water supply control on the hot water supply unit 4 side differs depending on the detected temperature of the heat medium ME1 flowing from the heat storage tank 8 to the heat exchanger 10 (= high level, low level or minimum level).
a) High level:
If the heat storage in the heat storage tank 8 is the amount of heat that can be discharged from the feed water W with the hot water HW at the set temperature, the amount of water flowing through the heat exchanger 10 is increased or decreased according to the detected temperature.
b) Low level:
If the heat storage can be used for heat exchange with the feed water W but the level of hot water with the set temperature hot water HW is not possible, the amount of water on the heat exchanger 10 side is switched to a fixed value lower than that at the set temperature hot water. This low value may be set to 1/2, 1/3, or less than 1/3 of the amount of water supplied on the heat exchanger 10 side when the set temperature can be discharged.
c) Minimum level:
If the heat storage is at a minimum level that cannot be used for heat exchange with the feed water W, the amount of water on the heat exchanger 10 side is suppressed to 0 and the feed water W is passed through the bypass pipe 16.

As described above, the hot water HW having a set temperature, the hot water HW having a temperature lower than the set temperature, or the water supply W is supplied to the auxiliary heating unit 6 from the hot water supply unit 4. The auxiliary heating unit 6 includes heat exchangers 26 and 28 as heating means for the hot water HW. The temperature of the hot water HW flowing into the water supply pipe 30 of the auxiliary heating unit 6 is detected by the temperature sensor 32. When the detected temperature is lower than the set temperature, the mode is switched to the auxiliary heating mode in which the hot water HW is heated to the set temperature.
In the auxiliary heating mode, the heat medium ME2 is circulated through the heat exchanger 26 to operate the heat source 34 and the hot water HW is circulated, and the heat of the heat medium ME2 is exchanged with the hot water HW.
The flow rate of the hot water HW flowing from the water supply pipe 30 to the heat exchanger 26 is adjusted by the water amount adjusting unit 38. For example, a mixing valve M <b> 2 that can control the distribution amount according to the detected temperature of the hot water HW by the control unit 20 is used for the water amount adjustment unit 38. The amount of hot water flowing to the bypass pipe 36 side and the amount of hot water flowing to the heat exchanger 26 side are adjusted. Thereby, the mixed hot water HW obtained by the water amount adjusting unit 38 is discharged from the hot water discharge pipe 40.
The hot water supply control on the auxiliary heating unit 6 side varies depending on the detected temperature of the hot water HW from the hot water supply unit 4 (above or below the set temperature).
d) Detection temperature of hot water HW ≧ set temperature:
If the temperature of the hot water HW entering the auxiliary heating unit 6 from the hot water supply unit 4 is equal to or higher than the set temperature, the hot water HW is discharged without shifting to the auxiliary heating mode.
e) Detection temperature of hot water HW <set temperature:
If the temperature of the hot water HW entering the auxiliary heating unit 6 from the hot water supply unit 4 is lower than the set temperature, the mode is shifted to the auxiliary heating mode, the heat of the heat medium ME2 is exchanged with the hot water HW, and the hot water HW at the set temperature is discharged. . The same applies when the water supply W that has passed through the hot water supply unit 4 flows into the auxiliary heating unit 6.

<Hot water control>
FIG. 2 shows a processing procedure of hot water supply control of the hot water supply system 2. In this processing procedure, it is determined whether the temperature of the heat medium ME1 in the heat storage tank 8 is equal to or higher than a predetermined temperature (S11). If the temperature of the heat medium ME1 is equal to or higher than the predetermined temperature (YES in S11), the hot water HW having a set temperature is generated by the control of the water amount adjusting unit 12 (S12). In this case, since the hot water HW having the set temperature is supplied from the hot water supply unit 4, the auxiliary heating unit 6 can obtain the hot water HW having the set temperature from the hot water discharge pipe 40 without shifting to the auxiliary heating mode (YES in S16) ( S17).

If the temperature of the heat medium ME1 is lower than the predetermined temperature (NO in S11), it is determined whether the temperature of the heat medium ME1 is a temperature at which heat exchange with the feed water W is possible (S13).
If the temperature of the heat medium ME1 is a temperature at which heat exchange with the feed water W is possible (YES in S13), the distribution amount of the heat exchanger 10 and the bypass pipe 16 of the feed water W is switched to a fixed value by the control of the water amount adjusting unit 12. (S14).
If the temperature of the heat medium ME1 is a temperature at which heat exchange with the feed water W is impossible (NO in S13), the hot water is passed from the hot water supply unit 4 to the auxiliary heating unit 6 without passing the feed water W through the heat exchanger 10 (S15). ).

  The auxiliary heating unit 6 determines whether the feed water W or the hot water HW flowing through the feed water pipe 30 is equal to or higher than a set temperature (S16). If the temperature is equal to or higher than the set temperature (YES in S16), hot water is supplied without performing auxiliary heating (S17). If the temperature is lower than the set temperature (NO in S16), the mode is shifted to the auxiliary heating mode, the water supply W or the hot water HW is heated up by exchanging heat with the heat of the heat medium ME2, and hot water is supplied at the set temperature (S18).

<Effect of one embodiment>
According to this embodiment, the following effects can be obtained.
(1) When the hot water HW having the set temperature cannot be obtained in the hot water supply section 4, the amount of water flowing into the heat exchanger 10 on the hot water supply section 4 side is suppressed, so that the pressure loss due to the heat exchanger 10 can be reduced.
(2) When the hot water HW having the set temperature cannot be obtained in the hot water supply unit 4, the hot water HW heated to the set temperature by the auxiliary heating of the auxiliary heating unit 6 can be supplied.
(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 increased, and the stratified state on the heat storage tank 8 side is not disturbed.

FIG. 3 shows a hot water supply system according to the first embodiment. In FIG. 3, the same parts as those in FIG.
The hot water supply system 2 according to the first embodiment includes a fuel cell unit 42, a hot water supply unit 44, and a backup hot water supply unit 46.
The fuel cell unit 42 includes 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 heat generated during power generation is used as a heat source. The heat exchanger 50 exchanges heat of the exhaust 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 path 54 of the heat medium ME1. When driven, the circulation pump 52 circulates the heat medium ME1 from the lower layer side of the heat storage tank 8 to the heat exchanger 50, and the heat medium ME1 after heat exchange of the heat storage tank 8 Return to the upper layer.
During power generation of the fuel cell 48, the circulation pump 52 is driven, the heat medium ME1 is circulated from the lower layer side of the heat storage tank 8 to the heat exchanger 50, the heat of the exhaust ME3 is exchanged with the heat medium ME1, and the heated heat 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 entry side of the heat exchanger 50, and the temperature of the heat medium ME1 on the lower layer side of the heat storage tank 8 is detected. A temperature sensor 58 is installed on 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 includes a heat storage tank 8 and a plate heat exchanger 60. A circulation path 62 for flowing the heat medium ME1 of the heat storage tank 8 to the plate heat exchanger 60 is provided with a heat pump 64 and a temperature sensor 22. 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 heat medium temperature 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 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 and 78. The bypass pipe 16 feeds the water supply W divided by the mixing valve 68 to the outlet pipe 18 side. The water control valve 74 controls the amount of hot water HW or feed water W discharged from the hot water discharge pipe 18. The temperature sensor 76 detects the hot water temperature on the outlet side of the plate heat exchanger 60. The temperature sensor 78 detects the temperature of the hot water HW obtained by mixing the hot water HW and the feed water W.

The backup hot water supply unit 46 includes 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 hot water HW from the hot water supply unit 44, and is provided with a temperature sensor 84, a water amount sensor 85, a water control valve 86, and a mixing valve 88 for branching the bypass pipe 36. The temperature sensor 84 detects the temperature of the hot water HW flowing from the hot water supply unit 44 or the water supply W. The water amount sensor 85 detects the amount of hot water HW or water supply W flowing from the hot water supply unit 44, and the water control valve 86 controls the amount of water.
The outlet pipe 40 is provided with temperature sensors 90 and 92. The temperature sensor 90 detects the hot water temperature on the outlet side of the plate heat exchanger 80. The temperature sensor 92 detects the temperature of the hot water HW obtained by mixing the supply water W or the hot water HW from the bypass pipe 36 and the hot water HW on the outlet 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 includes 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 through the circulation path 94 when driven. The plate heat exchanger 80 exchanges heat of the heat medium ME2 into the feed water W or the hot water HW. The heat exchanger 82 exchanges the combustion heat of the burner 102 with the heat medium ME2. The open tank 98 absorbs the volume fluctuation of the heat medium ME2 circulating in the circulation path 94.

<Control unit 20 of hot water supply system 2>
FIG. 4 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 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. Remote control unit 110 is provided in the remote control device, and is linked to battery control unit 104, hot water supply unit control unit 106, and backup control unit 108 by wire or wirelessly.
The battery control unit 104 is configured by 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 transmits and receives control data to and from the remote 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 temperature detected by the temperature sensors 56 and 58 is 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 an OS and a 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 transmits and receives control data to and from the remote 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 I / O 124 receives the detected temperatures of the temperature sensors 22, 66, 72, 76, and 78 and the detected water amount of the water amount sensor 70 as control information and obtains control outputs of the heat pump 64 and the mixing valve 68.
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 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 transmits and receives control data to and from the remote 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 I / O 132 receives the detected temperatures of the temperature sensors 84, 90, 92, and 100 and the detected water amount of the water amount sensor 85 as control information, and obtains control outputs of the circulation pump 96 and the mixing valve 88.

<Hot-water supply control by heating medium ME1>
5A shows the relationship between the hot water supply temperature and the minimum heating medium temperature when the hot water supply set temperature (hereinafter, simply referred to as “set temperature”) is 35 ° C., and FIG. 5B shows the set temperature of 40 ° C. FIG. 5C shows the relationship between the feed water temperature and the minimum heat medium temperature when the set temperature is 45 [° C.].
From these relationships, FIG. 6 shows a relationship graph between the feed water temperature and the minimum heat medium temperature using the set temperature as a parameter. In FIG. 6, A is a set temperature = 35 [° C.], B is a set temperature = 40 [° C.], and C is a set temperature = 45 [° C.].
From this relationship, for example, if the feed water temperature is 15 [° C.] and the set temperature is 40 [° C.], the minimum heat medium temperature needs to be 60 [° C.].

<When hot water of set temperature is possible with heat medium ME1>
A of FIG. 7 has shown operation | movement in case hot water supply of preset temperature is possible with heat-medium ME1. In A of FIG. 7, the thick line has shown the flow of the water supply W, the warm water HW, and the heat medium ME1.
When hot water supply at the set temperature is possible with the heat medium ME1, the hot water supply unit 44 has a value (set temperature + 5 [° C.]) that the detected temperature To1 of the temperature sensor 76 is higher than the set temperature by, for example, 5 [° C.] The number of rotations of the heat pump 64 is controlled so as to be the first target temperature. The opening degree of the 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.

  At this time, in the backup hot water supply unit 46, since the detected temperature Ti2 of the temperature sensor 84 is equal to or higher than the set temperature, the mixing valve 88 controls the opening of the port d side to 100 [%]. Since the burner 102 is not combusted, the mixing valve 88 has no water flow on the port c side. For example, when the set temperature = 40 [° C.] and the detection temperature Ti1 of the temperature sensor 72 = 20 [° C.], the ratio of the flow rate on the port a side and the flow rate on the port b side of the mixing valve 68 is a: b = 4: 1 may be used. In the mixing valve 88 of the backup hot water supply unit 46, the water amount is 100% on the port d side. That is, when hot water supply at the set temperature is possible with the heat medium ME1, four-fifths of the total amount of water flowing to the hot-water supply system 2 flows to the heat exchanger 60, and one-fifth of the total amount of water flows to the bypass pipe 16. . As a result, four-fifths of the total amount of water is affected by the heat exchanger 60.

<When the heating medium ME1 cannot supply hot water at the set temperature>
B of FIG. 7 shows an operation in the case where hot water at a set temperature cannot be supplied by the heat medium ME1. In B of FIG. 7, the thick line has shown the flow of the water supply W, the warm water HW, and the heat medium ME1 and ME2.
In this case, the circulation amount of the heat medium ME1 from the heat medium tank 8 with respect to the plate heat exchanger 60 is suppressed, and control for reducing the distribution amount of the feed water W is performed. In the hot water supply unit 44, when the heating medium ME1 cannot supply hot water at the set temperature, the detected temperature To1 of the temperature sensor 76 is lower than the detected temperature T1 of the temperature sensor 22 by, for example, 5 [° C.] (T1-5 [° C.]). The rotational speed of the heat pump 64 is controlled so that That is, the target temperature for heat exchange of the plate heat exchanger 60 is controlled to a value (T1-5 [° C.]) lower than the detected temperature T1, for example, by 5 [° C.], and the heat medium ME1 with respect to the plate heat exchanger 60 is controlled. Reduce circulation. At this time, the opening degree of the mixing valve 68 is controlled so that the detected temperature Tml of the temperature sensor 78 approaches the set temperature as much as possible. In this case, 100% water supply W flows to the port a side of the mixing valve 68.

At this time, in the backup hot water supply unit 46, the circulation pump 96 is operated and the burner 102 is combusted, and the temperature Tj detected by the temperature sensor 100 is controlled to be Tj = 80 [° C.]. In this case, since the detected temperature Ti2 of the temperature sensor 84 is Ti2 = T1-5 [° C.], it is mixed with the hot water HW of the detected temperature To2≈80 [° C.] of the temperature sensor 90, and the detected temperature Tm2 of the temperature sensor 92 is detected. The opening of the mixing valve 88 is controlled so that becomes the set temperature.
In this case, when the detected temperature Ti2 of the temperature sensor 84 and the detected temperature To2 of the temperature sensor 90 are compared, the set temperature is around 40 [° C.], so that the detected temperature Ti2 of the temperature sensor 84 becomes the detected temperature To2 of the temperature sensor 90. It is a value closer to the set temperature. For this reason, when the flow rates of the ports c and d of the mixing valve 88 are compared, c-side flow rate <d-side flow rate.

For example, when the set temperature = 40 [° C.] and Ti1 = 20 [° C.], if T1 = 40 [° C.], then To1 = 35 [° C.]. In this case, when the port a side flow rate: port b side flow rate of the mixing valve 68 is compared, a side flow rate: b side flow rate = 1: 0.
At this time, since Ti2 = 35 [° C.], the hot water HW of To2≈80 [° C.] and the hot water HW of Ti2 = 35 [° C.] are mixed and controlled to Tm2 = 40 [° C.], the mixing valve 88 The port c side flow rate and the port d side flow rate are c side flow rate: d side flow rate≈1: 8.
Accordingly, 100% of the total amount of water in the hot water supply system 2 is affected by the heat exchanger 60, and one ninth of the total amount of water is affected by the heat exchanger 80. At this time, the pressure loss due to the heat exchangers 60 and 80 is maximized. The improvement of the pressure loss by such a water supply form is the subject of this invention, and such a subject is improved by control shown in FIG.

<When heat exchange with heat medium ME1 is not possible>
C of FIG. 7 has shown operation | movement in case heat exchange by the heat medium ME1 is impossible. In C of FIG. 7, the thick line has shown the flow of the feed water W and the heat medium ME2.
When heat exchange by the heat medium ME1 is not possible, the hot water supply unit 44 has low heat storage and cannot be used for heat exchange for hot water supply. Therefore, the mixing valve 68 is controlled to flow 100% of the water supply W to the port b side. The heat pump 64 is stopped.
In this case, since 100% of the water supply W passes through the hot water supply unit 44 and flows into the backup hot water supply unit 46, the detected temperature Tml of the temperature sensor 78 becomes the same temperature as the detected temperature Ti1 of the temperature sensor 84.

In the backup hot water supply unit 46, the circulation pump 96 is operated to burn the burner 102, and the detected temperature Tj of the temperature sensor 100 is controlled to Tj = 80 [° C.].
In this case, since the detected temperature Ti2 of the temperature sensor 84 is lower than the set temperature, the hot water HW of the detected temperature To2 of the temperature sensor 90 is mixed with the feed water W and the detected temperature Tm2 of the temperature sensor 92 is mixed. The opening of the mixing valve 88 is controlled so that becomes the set temperature.
Since the set temperature is a value close to 40 [° C.], the detected temperature Ti2 is closer to the set temperature than the detected temperature To2, and therefore, when comparing the port c side flow rate and the port d side flow rate of the mixing valve 88, the c side The flow rate is smaller than the d-side flow rate.

For example, when the set temperature = 40 [° C.] and Ti1 = 20 [° C.], if the detected temperature T1 of the temperature sensor 22 is T1 = 20 [° C.], the heat pump 64 is stopped.
When the port a side flow rate and the port b side flow rate of the mixing valve 68 are compared, a side flow rate: b side flow rate = 0: 1, and 100% of the total water amount flows to the port b side.
Since the detected temperature Ti2 = 20 [° C.], when mixing the hot water HW with the detected temperature To2≈80 [° C.] and the feed water W with the detected temperature Ti2 to control the set temperature = 40 [° C.], the mixing valve 88 When comparing the port c side flow rate and the port d side flow rate, the c side flow rate: d side flow rate ≈ 1: 2. Therefore, one third of the total amount of water is affected by the heat exchanger 80, and no pressure loss is caused by the heat exchanger 60.

<Control of water supply amount of heat exchangers 60 and 80 when heat storage of heat medium ME1 is low>
FIG. 8 shows control of the water supply amount of the heat exchangers 60 and 80 when the heat storage of the heat medium ME1 is low.
In the hot water supply unit 44, the heating pump is set so that the detected temperature To1 is a value (T1-5 [° C]) lower than the detected temperature T1, for example, 5 [° C] (second target temperature for heat exchange). The number of revolutions of 64 is controlled. That is, the rotational speed of the heat pump 64 is reduced so as to suppress the circulation amount of the heat medium ME1 from the heat storage tank 8 to the heat exchanger 60. At this time, regardless of the value of the detected temperature Tm1, the degree of opening of the mixing valve 68 is controlled to limit the amount of water flowing to the port a side. Thereby, the pressure loss by the heat exchanger 60 can be reduced.
In order to reduce the pressure loss, the control of the mixing valve 68 may be selected from the following control patterns.
(1) Control pattern 1: Fixed value of port a side water amount and port b side water amount (constant distribution amount)
The amount of water set on the port a side and the port b side of the mixing valve 68 is a fixed value. For example, a side flow rate: b side flow rate = 1: 1. In this case, it is preferable to reduce the port a side flow rate.

(2) Control pattern 2: The opening on the port a side is reduced to a predetermined value based on the opening of the mixing valve 68 when hot water can be supplied at a set temperature.
Although the opening degree of the mixing valve 68 changes according to the feed water temperature and the set temperature, the opening degree on the port a side is halved on the basis of the opening degree of the mixing valve 68 when the hot water can be stored at the set temperature. Set the aperture to 1/3.
For example, when hot water supply at a set temperature is possible for heat storage, if a-side flow rate: b-side flow rate = 4: 1, a-side flow rate: b-side flow rate = 2: 3 or a-side flow rate: b-side flow rate = 4. : Change to 11

(3) Control pattern 3: In the control pattern 2, the opening of the mixing valve 68 is fixed to a predetermined value. In the control pattern 3, the opening is changed according to the detected temperature To1. For example, when the feed water temperature = 20 [° C.] and the set temperature = 40 [° C.], with the detected temperature To1 = 35 [° C.] based on the a side flow rate: b side flow rate = 4: 1 of the mixing valve 68, a Side flow rate: b side flow rate = 3: 2, detection temperature To1 = 30 [° C.] a side flow rate: b side flow rate = 2: 3, detection temperature To1 = 25 [° C.] a side flow rate: b side flow rate = 1 : The distribution amount of the total water amount of the mixing valve 68 is changed to 4. According to such a change in the distribution amount, the closer the hot water HW obtained in the hot water supply unit 44 is to the set temperature, the more the heating amount by the backup hot water supply unit 46 can be reduced, and the less pressure loss occurs on the backup hot water supply unit 46 side. As the temperature approaches, the amount of heating by the backup hot water supply unit 46 increases, and as a result, the pressure loss generated in the backup hot water supply unit 46 increases.
In other words, if the heat storage is sufficient for obtaining hot water at the set temperature, the opening degree of the mixing valve 68 is controlled so that the detected temperature Tm1 of the temperature sensor 78 becomes the set temperature, and the amount of heat storage is based on the opening degree. By switching in stages along with the reduction, the pressure loss due to the heat exchangers 60 and 80 can be reduced as well as the fluctuation amount.

In the case of FIG. 8, regardless of which of control patterns 1 to 3 is selected, the backup hot water supply unit 46 operates the circulation pump 96 to burn the burner 102 and the detected temperature Tj of the temperature sensor 100 = 80 [° C.]. To control.
Since the detection temperature Ti2 of the temperature sensor 84 is a value (T1-5 [° C]) to Ti1 [° C] lower than the detection temperature T1 by 5 [° C], the hot water HW and the detection temperature To2≈80 [° C] The hot water HW is mixed and the opening degree of the mixing valve 88 is controlled so that the detected temperature Tm2 becomes the set temperature. Since the detected temperature Ti2 is closer to the set temperature than the detected temperature To2, the port c side flow rate and the port d side flow rate of the mixing valve 88 are c side flow rate <d side flow rate.
For example, when the set temperature = 40 [° C.] and Ti1 = 20 [° C.], if T1 = 40 [° C.], then To1 = 35 [° C.]. At this time, in the control pattern 2, the port a side flow rate and the port b side flow rate of the mixing valve 68 are controlled to a side flow rate: b side flow rate = 2: 3 (when reduced to 1/2), and the detected temperature Tm1 = 26 [° C.]. If the detection temperature Ti2 = 26 [° C.], the detection temperature To2≈80 [° C.] is mixed, and if the opening of the mixing valve 88 is controlled to the detection temperature Tm2 = 40 [° C.], the c side flow rate: d side The flow rate is about 1: 3. Therefore, two-fifths of the total amount of water is affected by the heat exchanger 60, and one-fourth is affected by the heat exchanger 80. In this control pattern, the pressure loss is smaller than when heat storage is possible at a set temperature.

<Control of hot water supply system 2>
FIG. 9 shows a control processing procedure of the hot water supply system 2. This control includes each control of the remote control unit 110, the battery control unit 104, the hot water supply unit control unit 106, and the backup control unit 108, and each control is executed in cooperation.
In the remote control unit 110, after initialization (S101), input reception processing (S102) and display output processing (S103) are repeatedly executed. 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).

In the battery control unit 104, after initialization (S104), the operation is switched on / off by the input reception process (S102), the process proceeds to the heat recovery process (S105) shown in FIG. 10, and the state obtained by this heat recovery process Information is provided to the remote control unit 110.
After initialization (S106), hot water supply unit control unit 106 receives an instruction for a set temperature in input reception process (S102), and proceeds to hot water supply process (S107) shown in FIG. Provided to the control unit 110.
After the initialization (S108), the backup control unit 108 receives an instruction of the set temperature by the input reception process (S102), and proceeds to the backup hot water supply process (S109) shown in FIG. 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 in the input acceptance process (S102) of the remote control unit 110 is monitored (S201). If the operation switch is ON (YES in S201), the fuel cell 48 is driven (S202), The rotation of the circulation pump 52 is controlled so that the output temperature of the temperature sensor 58 is, for example, 75 [° C.].
If the operation switch is OFF (NO in S201), the fuel cell 48 is stopped (S204), and the circulation pump 52 is stopped.

<Hot water treatment>
FIG. 11 shows a processing procedure of hot water supply processing of the hot water supply unit 44. In this processing procedure, it is determined whether or not hot water is used (S301), and if it is not hot water use (NO in S301), the heat pump 64 is stopped (S302), and this processing ends.
If hot water is used (YES in S301), it is determined whether the detected temperature T1 is equal to or higher than a temperature at which the set temperature can be supplied (S303). If the detected temperature T1 is equal to or higher than the temperature at which the set temperature can be supplied (YES in S303), the hot water supply process shown in FIG. 7A is executed (S304). In this process, the rotation of the heat pump 64 is controlled so that the detected temperature To1 becomes a temperature (= set temperature + ΔT) higher than the set temperature by a constant temperature ΔT, for example, 5 [° C.] (S305), and at the same time, the detected temperature Tm1. The opening degree of the mixing valve 68 is controlled so that becomes the set temperature (S306).

If the detected temperature T1 is not equal to or higher than the temperature at which the set temperature can be supplied (NO in S303), whether the detected temperature T1 is equal to or higher than the feed water temperature by a constant temperature ΔT, for example, 5 [° C.] higher (= feed water temperature + ΔT). Judgment is made (S307). If the detected temperature T1 is equal to or higher than the temperature (= water supply temperature + ΔT) (YES in S307), the hot water supply process shown in FIG. 8 is executed (S308). In this process, the rotation of the heat pump 64 is controlled so that the detected temperature To1 is lower than the detected temperature T1 by a constant temperature ΔT, for example, 5 [° C.] (= T1 temperature−ΔT) (S309), and at the same time, mixing is performed. The opening degree of the valve 68 is controlled (S310). The opening degree control of the mixing valve 68 is either A, B in FIG. 12 or FIG.
If the detected temperature T1 is not equal to or higher than the temperature (= water supply temperature + ΔT) (NO in S307), the process shown in FIG. 7C is executed (S311). In this process, the heat pump 64 is stopped (S312), and the mixing valve 68 is controlled so that 100% of flowing water is obtained at the port b (S313).

<Opening control 1 of mixing valve 68>
A of FIG. 12 shows opening degree control 1 of the mixing valve 68. In this control 1, the opening degree of the mixing valve 68 is controlled to a fixed value so that the ports a and b of the mixing valve 68 have a predetermined ratio, for example, 1: 1 (S401).

<Opening control 2 of mixing valve 68>
B of FIG. 12 shows the opening degree control 2 of the mixing valve 68. In this control 2, the detected temperature To1 is set to the set temperature + T, and the opening ratio of the ports a and b where the detected temperature Tm1 becomes the set temperature is calculated by the hot water HW of the feed water temperature and the detected temperature To1 (S501). Let this opening degree be x and y.
After this calculation process, the opening degree of the mixing valve 68 is controlled so as to reduce the flow rate flowing through the port a (S502). For example, the opening degree is halved and the opening degree of the mixing valve 68 is controlled so that the opening ratio of the ports a and b is a: b = x / 2: (y + x / 2).

<Opening control 3 of mixing valve 68>
FIG. 13A shows the opening degree control 3 of the mixing valve 68. In the control 3, the detected temperature To1 is set to the set temperature + T, and the opening ratio of the ports a and b where the detected temperature Tm1 becomes the set temperature is calculated from the feed water temperature and the hot water HW of the detected temperature To1 (S601). Let this opening degree be x and y.
After this calculation process, the opening degree of the mixing valve 68 is controlled so as to reduce the flow rate flowing through the port a (S602). At that time, the amount of decrease is changed depending on the detected temperature T1.
For example, at a high temperature, a: b = x / 2: (y + x / 2),
At medium temperature, a: b = x / 3: (y + 2x / 3), and
At low temperature, a: b = x / 4: (y + 3x / 4)
The opening degree of the mixing valve 68 is controlled.

<Backup hot water treatment>
FIG. 14 shows a processing procedure for backup hot water supply processing. In this processing procedure, it is determined whether or not hot water is used (S801). This determination may be made based on the amount of water detected by the water amount sensor 85.
If hot water is not used (NO in S801), the hot water supply operation is stopped (S802), and the backup hot water supply process is terminated.
If hot water is being used (YES in S801), it is determined whether the detected temperature Ti2 is lower than the set temperature (S803). If the detected temperature Ti2 is lower than the set temperature (YES in S803), the process proceeds to feed water heating, and the circulation pump 96 is operated at the number of rotations corresponding to the required amount of heat (S804). At this time, the combustion of the burner 102 is controlled so that the detected temperature Tj becomes a predetermined temperature, for example, 80 [° C.] (S805). At the same time, the opening ratio of the mixing valve 88 is controlled so that the detected temperature Tm2 becomes the set temperature (S806).
If the detected temperature Ti2 is equal to or higher than the set temperature (NO in S803), the heating operation is stopped, and the opening ratio of the mixing valve 88 is controlled so that the water amount becomes 100% on the port d side.

<Effect of Example 1>
According to the first embodiment, the following effects can be obtained.
(1) The amount of heat can be used for hot water supply according to the heat storage in the heat storage tank 8.
(2) When the heat storage is low and cannot be used for hot water supply, the hot water supply W that has passed through the hot water supply unit 44 is heated to the set temperature by the backup hot water supply unit 46, and hot water supply at the set temperature is possible.
(3) Although the feed water W cannot be raised to the set temperature, in the case of heat storage that allows a certain amount of heat exchange, the amount of feed water flowing to the heat exchanger 60 is suppressed, pressure loss is reduced, and the rotation speed of the heat pump 64 Can be suppressed and efficient heat storage can be used.
(4) When the heat storage is low, forced heat medium circulation can be avoided and the stratified state of the heat storage tank 8 is not disturbed.

FIG. 15 shows a hot water supply system according to the second embodiment. In Example 1, the hot water supply unit 44 and the heat storage tank 8 were installed. However, as shown in FIG. 15, the heat storage tank 8 was removed from the hot water supply unit 44, and the tank unit 43 provided with the heat storage tank 8 and the heat storage tank 8 were removed. Even if the hot water supply unit 45 is configured, the same control is possible.

FIG. 16 shows a hot water supply system according to the third embodiment. In the second embodiment, the hot water supply unit 45 and the backup hot water supply unit 46 are separately configured. However, as shown in FIG. 16, the same control can be performed even if the hot water supply unit 47 in which the hot water supply unit 44 and the backup hot water supply unit 46 are integrated is configured. Is possible.

In the above-described embodiment, the hot water supply unit 44 and the backup hot water supply unit 46 are configured independently. However, the hot water supply unit 44, the backup hot water supply unit 46, and each control unit may be configured as an integrated hot water supply device.

[Other Embodiments]
(1) In the above embodiment, a configuration in which the water amount adjusting unit 12 is provided with the mixing valve 68 and a configuration in which the water amount adjusting unit 38 is provided with the mixing valve 88 are exemplified. A proportional valve may be provided to adjust the flow rate.
(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 the heat source of the heat medium ME2, other heat sources such as electric heat may be used.

As described above, the most preferable embodiment of the present invention has 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 gist of the invention described in the claims or disclosed in the embodiments for carrying out the invention. It goes without saying that such modifications and changes are included in the scope of the present invention.

  According to the present invention, exhaust heat or the like is stored by a heat medium, hot water control is performed according to the heat storage of the heat medium, and in this hot water control, the amount of water flowing to the heat exchanger is controlled according to the heat storage, If it is low, reducing the amount of water flowing to the heat exchanger can reduce pressure loss, power loss for circulation, etc., and it has beneficial effects such as not disturbing the stratified heat storage of the heat storage tank. It is.

DESCRIPTION OF SYMBOLS 2 Hot-water supply system 4 Hot-water supply part 6 Auxiliary heating part 8 Heat storage tank 10 Heat exchanger 12 Water quantity adjustment part 14 Water supply pipe 16 Bypass pipe 18 Hot water pipe 20 Control part 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 amount adjusting unit 40 Hot water outlet 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 Heater pump 66 Temperature sensor 68 Mixing valve 70 Water volume sensor 72 Temperature sensor 74 Water control valve 76, 78 Temperature sensor 80 Plate heat exchanger 82 Heat exchanger 84 Temperature sensor 85 Water volume sensor 86 Water control valve 88 Mix 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 unit 112, 120, 128 Processor 114, 122, 130 Memory Unit 116, 124, 132 Input / output unit (I / O)
118, 126, 134 System communication unit

Claims (8)

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 feed water,
A temperature sensor for detecting the temperature of the heat medium circulating in the heat exchanger;
Water amount adjusting means for distributing supply water to the heat exchanger and the bypass passage, and adjusting a distribution amount to be supplied to the heat exchanger and the bypass passage of the supply water;
A pump for circulating the heat medium of the heat storage tank to the heat exchanger through a circulation path;
It is determined whether the hot water can be discharged at a set temperature based on the detected temperature of the heating medium. If hot water cannot be supplied at the set temperature, the distribution amount of the supplied water flowing to the heat exchanger and the bypass passage is set to a fixed value by the water amount adjusting means. A controller that controls or cancels the water flow of the heat exchanger, sets the target temperature of the heat exchanger to a temperature lower than the detected temperature of the heat medium by a predetermined temperature, and controls the pump;
A hot water supply system comprising:   Further, when the hot water at the set temperature is possible, the control unit controls the heat exchange temperature of the heat exchanger from the preset temperature to a temperature higher than the set temperature by heat exchange, and the hot water at the set temperature is not possible. The hot water supply system according to claim 1, wherein the heat exchange temperature of the heat exchanger is controlled to a temperature lower by a predetermined temperature than the detected temperature of the heat medium by heat exchange. A hot water supply section that generates hot water using the heat exchanger and generates hot water;
If the hot water temperature of the hot water supply unit is lower than the set temperature, an auxiliary heating unit that heats the hot water to a set temperature and discharges the hot water,
The hot water supply system according to claim 1, comprising: A hot water 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,
Detecting the temperature of the heat medium circulating in the heat exchanger;
Distributing the water supply to the heat exchanger and the bypass passage by a water amount adjusting means, and adjusting the distribution amount of the water supply flowing to the heat exchanger and the bypass passage;
Circulating the heat medium in the heat storage tank to the heat exchanger through a circulation path;
A step of judging from the temperature of the heating medium whether the hot water can be discharged at a set temperature;
When hot water cannot be supplied at a set temperature, the distribution amount of the water supplied to the heat exchanger and the bypass passage is controlled to a fixed value by the water amount adjusting means, or the water flow of the heat exchanger is canceled, and the heat medium A step of controlling the heat medium circulation to a target temperature set at a temperature lower than the temperature of
A hot water supply control method comprising: Furthermore, when hot water can be discharged at a set temperature, the step of controlling the heat exchange temperature of the heat exchanger from the set temperature to a temperature higher than the set temperature by heat exchange,
When the hot water at the set temperature is not possible, the step of controlling the heat exchange temperature of the heat exchanger to a temperature that is lower than the temperature of the heat medium by a predetermined temperature by heat exchange, and
The hot water supply control method according to claim 4, comprising: And a step of generating hot water using the heat exchanger and discharging the hot water;
If the hot water temperature is lower than the set temperature, the step of heating the hot water to a set temperature and letting out hot water;
The hot water supply control method according to claim 4, 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 supply water to the heat exchanger and the bypass passage, and adjusting a distribution amount to be supplied to the heat exchanger and the bypass passage of the supply water;
A pump for circulating the heat medium of the heat storage tank to the heat exchanger through a circulation path;
It is determined whether the hot water can be discharged at a set temperature based on the detected temperature of the heating medium. If hot water cannot be supplied at the set temperature, the distribution amount of the supplied water flowing to the heat exchanger and the bypass passage is set to a fixed value by the water amount adjusting means. A controller that controls or cancels the water flow of the heat exchanger, sets the target temperature of the heat exchanger to a temperature lower than the detected temperature of the heat medium by a predetermined temperature, and controls the pump;
A hot water supply apparatus comprising: An auxiliary heating unit that is provided separately or integrally with the hot water supply device according to claim 7 and that heats the hot water to a set temperature and discharges the hot water if the tapping temperature is lower than the set temperature,
A hot water supply apparatus comprising:

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