JP7178125B2 - Hot water supply system, hot water supply control method, hot water supply device and program - Google Patents

Description

The present invention relates to control technology for a heat exchanger that exchanges heat from a heat medium stored in a heat storage tank to feed water.

Exhaust heat is heat-exchanged with a heat medium, and this heat medium is stored in a heat storage tank for heat storage. In this heat storage tank, a so-called layered heat storage method is adopted in which a low-temperature heat medium is heated from the lower layer side, heated to a high temperature, and returned to the upper layer side of the heat storage tank with a rising gradient from the lower layer side to the upper layer side. In the utilization of stored heat from a heat storage tank using such a heat storage method, a heat medium is taken out from the upper layer side and heat is exchanged with hot water.
Regarding such heat exchange, when the heat medium in the heat storage tank is heat-exchanged with the feed water, depending on the amount of heat stored in the heat storage tank, a shortage of heat is generated when the feed water is heated to the set temperature. It is known to make up for this insufficient amount of heat with an auxiliary heating source and raise the hot water temperature to the set temperature (Patent Document 1).

JP 2011-214793 A

By the way, the technique described in Patent Document 1 can efficiently use the heat stored in the heat storage tank to heat the feed water, and its practicality is highly evaluated.
However, even if the heat stored in the heat storage tank is small, if the heat is to be fully used for heating the feed water, the amount of heat medium circulating in the feed water flowing through the heat exchanger will be increased to the limit. In such control, a heat exchanger such as a plate heat exchanger has a narrow water supply passage, and pressure loss cannot be ignored.
Moreover, there is a problem that disturbing the stratified state of the hierarchical heat storage in the heat storage tank lowers the heat storage utilization efficiency even if the heat exchange efficiency is high.
SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to achieve efficient hot water supply by increasing the utilization efficiency of stored heat and reducing pressure loss.

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 in which a heat medium is stored in a heat storage tank and heat of the heat medium is exchanged with water supply, wherein the heat medium is transferred to the water supply. A heat exchanger for heat exchange, a first temperature sensor for detecting the temperature of the heat medium, a second temperature sensor for detecting the temperature of the feed water heat-exchanged by the heat exchanger, and the heat exchanger. and a bypass passage, a pump for circulating the heat medium from the heat storage tank to the heat exchanger, and hot water supply at a set temperature based on the detected temperature of the heat medium. When it is determined that the When it is determined from the detected temperature of the heat medium that it is impossible to supply hot water at the set temperature by controlling the rotation speed of the pump, the temperature of the water supply detected by the second temperature sensor is used to control the temperature of the water supply to the heat exchanger. The feed water is distributed at a second distribution ratio in which the distribution amount is stepwise reduced from the first distribution ratio, and the temperature of the heat medium detected by the first temperature sensor is higher than the temperature of the feed water. In the case of temperature, the controller controls the rotation speed of the pump so that the temperature detected by the second temperature sensor is lower than the temperature detected by the first temperature sensor by the same or different temperature as the predetermined temperature. and
In this hot water supply system, the controller further rotates the pump so that the temperature detected by the second temperature sensor is lower than the temperature detected by the first temperature sensor by a temperature equal to or different from the predetermined temperature. The number is controlled when it is determined from the detected temperature of the heat medium that hot water cannot be supplied at the set temperature, and when the detected temperature of the heat medium is higher than the water supply temperature by the same or different temperature as the predetermined temperature . is.
In this hot water supply system, the heat source for heating the heat medium in the heat storage tank further includes a fuel cell unit for heat-exchanging exhaust heat of the fuel cell with the heat medium.

In order to achieve the above object, according to one aspect of the hot water supply control method of the present invention, a heat medium is stored in a heat storage tank, and the heat of the heat medium is heat-exchanged with water supply, the hot water supply control method comprising: a step of heat-exchanging said heat medium with feed water; a step of detecting a temperature of said heat medium with a first temperature sensor; and a step of detecting a temperature of said heat medium with a second temperature sensor; a step of detecting a temperature; a step of adjusting a distribution amount of the feed water distributed to the heat exchanger and the bypass by a water amount adjusting means; and a step of using a pump to circulate the heat medium from the heat storage tank to the heat exchanger. and when the control unit determines that the hot water supply at the set temperature is possible from the detected temperature of the heat medium, the water is distributed to the heat exchanger and the bypass at a first distribution ratio, and the second water supply is distributed to the heat exchanger and the bypass. The rotation speed of the pump is controlled so that the temperature detected by the temperature sensor is higher than the set temperature by a predetermined temperature . Distributing the feed water at a second distribution ratio in which the distribution amount to the heat exchanger is stepwise reduced from the first distribution ratio according to the temperature of the feed water detected by the temperature sensor of 2, If the temperature of the heat medium detected by the first temperature sensor is higher than the temperature of the feed water, the temperature detected by the second temperature sensor is set to the predetermined temperature higher than the temperature detected by the first temperature sensor . and controlling the number of rotations of the pump to lower the temperature by the same or different temperature .
In this hot water supply control method, the controller further controls the pump so that the temperature detected by the second temperature sensor is lower than the temperature detected by the first temperature sensor by a temperature equal to or different from the predetermined temperature. The rotational speed is controlled when it is determined from the detected temperature of the heat medium that the hot water cannot be supplied at the set temperature, and the detected temperature of the heat medium is higher than the water supply temperature by the same or different temperature as the predetermined temperature . It is time.
This hot water supply control method further includes the step of exchanging exhaust heat of the fuel cell with the heat medium to heat the heat medium by the fuel cell unit.

In order to achieve the above object, according to one aspect of the hot water supply apparatus of the present invention, there is provided a hot water supply apparatus in which a heat medium is stored in a heat storage tank and heat of the heat medium is exchanged with water supply, wherein the heat medium is transferred to the water supply. A heat exchanger for heat exchange, a first temperature sensor for detecting the temperature of the heat medium, a second temperature sensor for detecting the temperature of the feed water heat-exchanged by the heat exchanger, and the heat exchanger. and a bypass passage, a pump for circulating the heat medium from the heat storage tank to the heat exchanger, and hot water supply at a set temperature based on the detected temperature of the heat medium. When it is determined that the When it is determined from the detected temperature of the heat medium that it is impossible to supply hot water at the set temperature by controlling the rotation speed of the pump, the temperature of the water supply detected by the second temperature sensor is used to control the temperature of the water supply to the heat exchanger. The feed water is distributed at a second distribution ratio in which the distribution amount is stepwise reduced from the first distribution ratio, and the temperature of the heat medium detected by the first temperature sensor is higher than the temperature of the feed water. In the case of temperature, the controller controls the rotation speed of the pump so that the temperature detected by the second temperature sensor is lower than the temperature detected by the first temperature sensor by the same or different temperature as the predetermined temperature. and
In this hot water supply apparatus, the controller further rotates the pump so that the temperature detected by the second temperature sensor is lower than the temperature detected by the first temperature sensor by a temperature equal to or different from the predetermined temperature. The number is controlled when it is determined from the detected temperature of the heat medium that hot water cannot be supplied at the set temperature, and when the detected temperature of the heat medium is higher than the water supply temperature by the same or different temperature as the predetermined temperature . is.
In this water heater, the heat source for heating the heat medium in the heat storage tank is further provided with a fuel cell unit including a heat exchanger for heat-exchanging exhaust heat of the fuel cell to the heat medium.

In order to achieve the above object, according to one aspect of the program of the present invention, there is provided a program to be executed by a computer, which has a function of acquiring the detected temperature of the heat medium detected by the first temperature sensor ; A function of taking in the temperature of the feed water heat-exchanged in the heat exchanger detected by the temperature sensor of, a function of adjusting the distribution amount of the feed water distributed to the heat exchanger and the bypass passage by the water amount adjustment means, and a function from the heat storage tank A function of circulating the heat medium through the heat exchanger from a pump , and when it is determined that hot water supply at a set temperature is possible based on the detected temperature of the heat medium, the heat exchanger and the bypass are distributed at the first distribution ratio. The water supply is distributed, the rotation speed of the pump is controlled so that the temperature detected by the second temperature sensor is higher than the set temperature by a predetermined temperature, and the detected temperature of the heat medium is used to supply hot water at the set temperature. If it is determined that it is not possible, a second distribution in which the distribution amount to the heat exchanger is reduced stepwise from the first distribution ratio according to the temperature of the feed water detected by the second temperature sensor If the temperature of the heat transfer medium detected by the first temperature sensor is higher than the temperature of the water supply, the temperature detected by the second temperature sensor is detected by the first temperature sensor. and a function of controlling the number of revolutions of the pump so that the temperature is lower than the detected temperature by the same or different temperature as the predetermined temperature.
In this program, the number of revolutions of the pump is further controlled so that the temperature detected by the second temperature sensor is lower than the temperature detected by the first temperature sensor by a temperature equal to or different from the predetermined temperature. is when it is determined from the detected temperature of the heat medium that hot water cannot be supplied at the set temperature, and the detected temperature of the heat medium is higher than the feed water temperature by the same or different temperature as the predetermined temperature .
In this program, the computer further implements a function of controlling the heat source for heating the heat medium in the heat storage tank and the fuel cell unit for heat-exchanging exhaust heat of the fuel cell with the heat medium.

ADVANTAGE OF THE INVENTION According to this invention, one of the following effects is acquired.
(1) Even if the amount of heat stored in the heat storage tank does not reach the amount of heat required to supply hot water at the set temperature, the heat medium in the heat storage tank is used, so the heat amount of the heat medium can be used effectively.
(2) When the amount of heat stored in the heat storage tank does not reach the amount of heat required to discharge hot water at the set temperature, the amount of heat exchange water flowing to the heat exchanger can be reduced, and the pressure loss on the heat exchanger side can be reduced.
(3) A circulation pump is generally used to circulate the heat medium in the heat exchanger, but the amount of circulation can be reduced.
(4) When the amount of heat stored in the heat storage tank does not reach the amount of heat required to discharge hot water at the set temperature, the amount of heat medium used in the heat storage tank is reduced. can be used efficiently.

1 is a diagram showing a hot water supply system according to an embodiment; FIG. 5 is a flow chart showing an example of a hot water supply control method; 1 is a diagram showing a hot water supply system according to Embodiment 1; FIG. It is a block diagram showing a control system. A is a table showing the water supply temperature, hot water temperature, heat exchange water volume, and minimum heat medium temperature when the hot water supply temperature is set to 35°C, and B is the water supply temperature and hot water temperature when the hot water supply temperature is set to 40°C. A table showing temperature, heat exchange water amount and minimum heat medium temperature, and C is a table showing water supply temperature, hot water outlet temperature, heat exchange water amount and minimum heat medium temperature when hot water supply temperature is set to 45[°C]. FIG. 5 is a diagram showing the minimum heat medium temperature with respect to the feed water temperature when the set temperature is used as a parameter. FIG. 4 is a diagram for explaining a hot water supply operation corresponding to heat storage; FIG. 10 is a diagram showing a hot water supply circuit when heat storage is low; It is a figure which comprehensively shows the processing procedure of a hot water supply system. 4 is a flow chart showing a processing procedure of a fuel cell unit; 4 is a flow chart showing a processing procedure of the hot water supply unit; A is a flow chart showing control of the mixing valve, and B is a flow chart showing control of the mixing valve. 4 is a flow chart showing control of a mixing valve; 4 is a flow chart showing a processing procedure of a backup hot water supply unit; FIG. 10 is a diagram showing a hot water supply system according to Embodiment 2; FIG. 11 is a diagram showing a hot water supply system according to Embodiment 3;

[One embodiment]
FIG. 1 shows a hot water supply system according to one 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 section 4 and an auxiliary heating section 6 . The hot water supply unit 4 heat-exchanges the 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 at a set temperature, the hot water HW is discharged as it is. hot water.

The hot water supply unit 4 is provided with a heat storage tank 8 , a pump 9 , a heat exchanger 10 and a water volume adjustment unit 12 . Heat is stored in the heat storage tank 8 by the heat medium ME1. The heat medium ME1 taken out from the lower layer side of the heat storage tank 8 is circulated to the heat source side (not shown) to be heated, and the high temperature heat medium ME1 is returned to the upper layer side of the heat storage tank 8 . As a result, heat is stored in the heat storage tank 8 in a stratified state rising from the lower layer to the upper layer.
The pump 9 is operated when the heat of the heat medium ME1 is heat-exchanged with the feed water W, and the heat medium ME1 is circulated through the heat exchanger 10 .
A plate heat exchanger is used for the heat exchanger 10, for example. 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. returned to the side.
The water quantity adjusting unit 12 is an example of water quantity adjusting means for the heat exchanger 10 , distributes the feed water W to the heat exchanger 10 and a bypass pipe 16 that is an example of a bypass passage, and adjusts the water flow rate of the heat exchanger 10 . The water supply W from the water supply pipe 14 flows through the water quantity adjusting portion 12 to the inlet side of the heat exchanger 10 or flows to the hot water outlet pipe 18 from the bypass pipe 16 on the outlet side. In the water amount adjusting unit 12, the control unit 20 is provided with a mixing valve M1 whose opening degree is controlled, and the distribution amount of the feed water W flowing through the heat exchanger 10 and the bypass pipe 16 is adjusted.

A temperature sensor 22 detects the temperature of the heat medium ME1 circulating from the heat storage tank 8 to the heat exchanger 10 . A temperature sensor 24 detects the temperature of the hot water HW in which the hot water HW in the hot water outlet pipe 18 is mixed with the feed water W in the bypass pipe 16 .
The control unit 20 determines whether or not hot water can be supplied at the set temperature based on the detected temperature of the heat medium ME1, and if hot water cannot be supplied at the set temperature, the amount of water supplied to the heat exchanger 10 and the bypass pipe 16 by the water amount adjustment unit 12 is distributed. is controlled to a fixed value, or the water supply to the heat exchanger 10 is stopped. 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 according to 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 lowest level).
a) High level:
If the amount of heat stored in the heat storage tank 8 is such that hot water HW at the set temperature can be discharged from the feed water W, the amount of water flowing through the heat exchanger 10 is increased or decreased according to the detected temperature.
b) Low level:
Although the stored heat can be used for heat exchange with the feed water W, if the hot water HW at the set temperature cannot be discharged, the amount of water on the side of the heat exchanger 10 is switched to a fixed value lower than that at the time of hot water discharge at the set temperature. This low value may be one-half, one-third, or less than one-third of the amount of water supplied to the heat exchanger 10 when hot water at the set temperature is possible.
c) Minimum level:
If the stored heat 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 .

In this way, hot water HW at a set temperature, hot water HW at a temperature lower than the set temperature, or water supply W is supplied from the hot water supply unit 4 to the auxiliary heating unit 6 . The auxiliary heating unit 6 is provided with heat exchangers 26 and 28 as means for heating 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 a temperature sensor 32, and when the detected temperature is lower than the set temperature, the hot water HW is switched to the auxiliary heating mode to raise the temperature to the set temperature.
In this 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 to exchange the heat of the heat medium ME2 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 section 38 . For example, a mixing valve M2 that can control the amount of water to be distributed according to the detected temperature of the hot water HW by the control unit 20 is used for the water amount adjusting 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. As a result, the mixed hot water HW obtained by the water amount adjusting unit 38 is discharged from the hot water discharge pipe 40 .
Hot water supply control on the auxiliary heating unit 6 side differs depending on the detected temperature of the hot water HW from the hot water supply unit 4 (above the set temperature or below the set temperature).
d) Detected temperature of hot water HW≧Set temperature:
If the temperature of the hot water HW entering the auxiliary heating part 6 from the hot water supply part 4 is equal to or higher than the set temperature, the hot water HW is discharged without shifting to the auxiliary heating mode.
e) Detected 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 heat-exchanged with the hot water HW, and the hot water HW at the set temperature is discharged. . The same is true when the feed water W that has passed through the hot water supply unit 4 flows into the auxiliary heating unit 6 .

<Hot water supply control>
FIG. 2 shows the hot water supply control processing procedure of this 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 the set temperature is generated under the control of the water amount adjustment unit 12 (S12). In this case, since the hot water HW of the set temperature is supplied from the hot water supply unit 4, the auxiliary heating unit 6 can obtain the hot water HW of the set temperature from the hot water outlet 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 can be exchanged with the feed water W (YES in S13), the amount of the feed water W distributed to the heat exchanger 10 and the bypass pipe 16 is switched to a fixed value by the control of the water amount adjustment unit 12. (S14).
If the temperature of the heat medium ME1 is a temperature at which heat exchange with the feed water W is not possible (NO in S13), the feed water W is not passed through the heat exchanger 10, but is flowed from the hot water supply unit 4 to the auxiliary heating unit 6 (S15 ).

The auxiliary heating unit 6 determines whether the water supply W or hot water HW flowing through the water supply pipe 30 is at or above the set temperature (S16). If the temperature is equal to or higher than the set temperature (YES in S16), hot water is supplied without auxiliary heating (S17). If the temperature is less than the set temperature (NO in S16), the mode shifts to the auxiliary heating mode, heat is exchanged with the heat of the heat medium ME2 to raise the temperature of the water supply W or the hot water HW, and hot water is supplied at the set temperature (S18).

<Effect of one embodiment>
According to this one embodiment, the following effects are obtained.
(1) When the hot water HW at the set temperature cannot be obtained in the hot water supply unit 4, the amount of water flowing to the heat exchanger 10 on the hot water supply unit 4 side is suppressed, so the pressure loss due to the heat exchanger 10 can be reduced.
(2) When hot water HW at the set temperature cannot be obtained in the hot water supply unit 4, hot water HW heated to the set temperature by auxiliary heating by 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 amount of heat stored, the utilization efficiency of the heat medium ME1 in 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 in FIG. 1 are denoted by the same reference numerals.
The hot water supply system 2 of 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 is equipped 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 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 a circulation path 54 for the heat medium ME1, and when driven, circulates the heat medium ME1 from the lower layer side of the heat storage tank 8 to the heat exchanger 50, and circulates the heat medium ME1 after heat exchange through the heat storage tank 8. Return to upper layer.
When the fuel cell 48 generates electricity, 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, and the heat of the exhaust gas ME3 is heat-exchanged with the heat medium ME1. The medium ME 1 is returned to the upper layer side of the heat storage tank 8 . As a result, 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 to detect the temperature of the heat medium ME1 on the lower layer side of the heat storage tank 8 . A temperature sensor 58 is installed on the outlet side of the heat exchanger 50 to detect the temperature of the heat medium ME1 returned to the upper layer side of the heat storage tank 8 .

The hot water supply unit 44 is provided with a plate heat exchanger 60 together with the heat storage tank 8 . A heat supply pump 64 and a temperature sensor 22 are provided in a circulation path 62 through which the heat medium ME1 of the heat storage tank 8 flows to the plate heat exchanger 60 . When the heat supply pump 64 is driven, the heat medium ME1 circulates from the upper layer 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 . A 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 water supply W is supplied. The water supply pipe 14 is provided with a mixing valve 68 , a water quantity sensor 70 and a temperature sensor 72 , and is connected to the hot water supply pipe 18 via the mixing valve 68 and the bypass pipe 16 . The hot water outlet pipe 18 is equipped with a water control valve 74 and temperature sensors 76 and 78 . The bypass pipe 16 allows the water supply W split by the mixing valve 68 to flow into the hot water outlet pipe 18 side. The water control valve 74 controls the amount of hot water HW or water supply W discharged from the hot water discharge pipe 18 . A temperature sensor 76 detects the hot water temperature on the outlet side of the plate heat exchanger 60 . A temperature sensor 78 detects the temperature of hot water HW obtained by mixing hot water HW and feed water W. FIG.

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 its inlet side and a hot water outlet pipe 40 on its outlet side. The water supply pipe 30 is supplied with water W or hot water HW from the hot water supply unit 44, is provided with a temperature sensor 84, a water quantity sensor 85, a water control valve 86, and is connected to a mixing valve 88 for branching the bypass pipe 36. Temperature sensor 84 detects the temperature of hot water HW or water supply W flowing from hot water supply unit 44 . A water quantity sensor 85 detects the quantity of hot water HW or water supply W flowing from the hot water supply unit 44, and a water control valve 86 controls the quantity of water.
The hot water outlet pipe 40 is provided with temperature sensors 90 and 92 . A temperature sensor 90 detects the hot water temperature on the outlet side of the plate heat exchanger 80 . A temperature sensor 92 detects the temperature of hot water HW that is a mixture of the water supply W or hot water HW from the bypass pipe 36 and the hot water HW on the hot water outlet pipe 40 side.
A circulation path 94 is provided in the plate heat exchanger 80 to circulate the heat medium ME2. The circulation path 94 is equipped 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 through the circulation path 94 when driven. The plate heat exchanger 80 heat-exchanges the heat of the heat medium ME2 to the feed water W or the hot water HW. The heat exchanger 82 heat-exchanges the combustion heat of the burner 102 to the heat medium ME2. The open tank 98 absorbs volume fluctuations of the heat medium ME2 circulating in the circulation path 94 .

<Control unit 20 of hot water supply system 2>
FIG. 4 shows the controller 20 (FIG. 1) of the hot water supply system 2. As shown in FIG. The controller 20 includes a battery controller 104 , a hot water supply unit controller 106 , a backup controller 108 and a remote control controller 110 . A cell control unit 104 controls the fuel cell unit 42 . Hot water supply unit control portion 106 controls hot water supply unit 44 . Backup control unit 108 controls backup hot water supply unit 46 . Remote control unit 110 is provided in the remote control device and communicates with 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 composed of a computer, and includes a processor 112 , a memory unit 114 , an input/output unit (I/O) 116 and a system communication unit 118 . A processor 112 executes an OS (Operating System) and a battery control program in a memory unit 114 . The memory unit 114 includes ROM (Read-Only Memory) and RAM (Random-Access Memory), and stores an OS and a battery control program. System communication unit 118 transmits and receives control data to and from remote controller control unit 110 , system communication unit 126 of hot water supply unit control unit 106 , and system communication unit 134 of 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.

Hot water supply unit control section 106 is configured by a computer, and includes processor 120 , memory section 122 , input/output section (I/O) 124 , and system communication section 126 . Processor 120 executes an OS and a hot water supply control program in 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 controller 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 . The temperatures detected by the temperature sensors 22, 66, 72, 76 and 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 for the heat supply 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 in the memory unit 130 . The memory unit 130 includes ROM, EEPROM, and RAM, and stores an OS and a backup control program. System communication unit 134 transmits and receives control data to and from remote controller control unit 110 , system communication unit 118 of battery control unit 104 , and system communication unit 126 of hot water supply unit control unit 106 . The temperatures detected by 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 for the circulation pump 96 and the mixing valve 88 are obtained.

<Hot water supply control by heat medium ME1>
FIG. 5A shows the relationship between the water supply temperature and the minimum heat medium temperature when the hot water supply set temperature (hereinafter simply referred to as "set temperature") is 35 [° C.], and FIG. FIG. 5C shows the relationship between the feed water temperature and the minimum heat medium temperature when the set temperature is 45[° C.].
Based on these relationships, FIG. 6 is a graph showing the relationship between the feed water temperature and the minimum heat medium temperature with the set temperature as a parameter. In FIG. 6, A is set temperature = 35 [°C], B is set temperature = 40 [°C], and C is 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 transfer medium temperature must be 60[°C].

<When hot water supply at the set temperature is possible with the heat medium ME1>
FIG. 7A shows the operation when the heating medium ME1 can supply hot water at the set temperature. In FIG. 7A, thick lines indicate the flows of the feed water W, hot water HW, and heat medium ME1.
When the heat medium ME1 can supply hot water at the set temperature, in the hot water supply unit 44, the detected temperature To1 of the temperature sensor 76 is a value higher than the set temperature by, for example, 5 [°C] (set temperature + 5 [°C]) (heat exchange The rotation speed of the heat supply pump 64 is controlled so as to achieve the first target temperature. The opening degrees of the ports a and b of the mixing valve 68 are 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, the temperature Ti2 detected by the temperature sensor 84 is equal to or higher than the set temperature, so the mixing valve 88 controls the opening of the port d side to 100%. Since the burner 102 does not burn, the mixing valve 88 does not pass water on the port c side. For example, when the set temperature is 40° C. and the detected temperature Ti1 of the temperature sensor 72 is 20° C., the ratio of the flow rate on the port a side and the port b side of the mixing valve 68 is a:b=4: It should be 1. In the mixing valve 88 of the backup hot water supply unit 46, the amount of water on the port d side becomes 100%. That is, when the heat medium ME1 can supply hot water at the set temperature, four-fifths of the total amount of water flowing through 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. . This results in four-fifths of the total water volume being affected by the heat exchanger 60 .

<Case in which hot water at the set temperature cannot be supplied with heat medium ME1>
B in FIG. 7 shows the operation when the heating medium ME1 cannot supply hot water at the set temperature. In FIG. 7B, thick lines indicate the flows of the feed water W, hot water HW, and heat mediums ME1 and ME2.
In this case, control is performed to suppress the circulation amount of the heat medium ME1 from the heat storage tank 8 to the plate heat exchanger 60 and to reduce the distribution amount of the feed water W. When the heating medium ME1 cannot supply hot water at the set temperature, in the hot water supply unit 44, the temperature To1 detected by the temperature sensor 76 is lower than the temperature T1 detected by the temperature sensor 22 by, for example, 5[°C] (T1-5[°C]). The rotation speed of the heat supply 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 by, for example, 5[°C]. 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% of the feed water W flows to the port a side of the mixing valve 68 .

At this time, the backup hot water supply unit 46 operates the circulation pump 96 and burns the burner 102 so that the detected temperature Tj of the temperature sensor 100 becomes Tj=80[° C.]. In this case, since the temperature Ti2 detected by the temperature sensor 84 is Ti2=T1-5[°C], the temperature Tm2 detected by the temperature sensor 92 is mixed with the hot water HW whose temperature To2≈80[°C] detected by the temperature sensor 90 is mixed. is 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.]. This value is closer to the set temperature. Therefore, when the flow rates of ports c and d of the mixing valve 88 are compared, c side flow rate<d side flow rate.

For example, if the set temperature is 40[°C] and Ti1=20[°C], then To1=35[°C] if T1=40[°C]. In this case, when the port a side flow rate of the mixing valve 68 is compared with the port b side flow rate, the a side flow rate:b side flow rate is 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 c side flow rate and the port d side flow rate are c side flow rate: d side flow rate ≈ 1:8.
Therefore, 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. An object of the present invention is to improve the pressure loss due to such a water supply form, and such an object is improved by the control shown in FIG.

<Case where heat exchange by heat medium ME1 is not possible>
C of FIG. 7 shows the operation when heat exchange by the heat medium ME1 is impossible. In C of FIG. 7, thick lines indicate the flow of the feed water W and the heat medium ME2.
When the heat medium ME1 cannot exchange heat, the hot water supply unit 44 has a low heat storage capacity and cannot be used for heat exchange for hot water supply. , the heat pump 64 is stopped.
In this case, 100% of the water supply W passes through the hot water supply unit 44 and flows into the backup hot water supply unit 46, so 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, the burner 102 is burned, and the detected temperature Tj of the temperature sensor 100 is controlled to Tj=80[° C.].
In this case, since the temperature Ti2 detected by the temperature sensor 84 is less than the set temperature, the hot water HW having the temperature To2 detected by the temperature sensor 90≈80° C. is mixed with the water supply W, and the temperature Tm2 detected by the temperature sensor 92 is mixed. is the set temperature.
Since the set temperature is close to 40° C., the detected temperature Ti2 is closer to the set temperature than the detected temperature To2. Flow rate < d side flow rate.

For example, when the set temperature is 40[° C.] and Ti1=20[° C.], if the temperature T1 detected by the temperature sensor 22 is set to T1=20[° C.], the heat supply pump 64 is stopped.
Comparing the port a side flow rate and the port b side flow rate of the mixing valve 68, the a side flow rate:b side flow rate=0:1, and 100 [%] of the total water flow flows to the port b side.
Since the detected temperature Ti2 is 20[°C], the mixing valve 88 When the port c side flow rate and the port d side flow rate are compared, c side flow rate: d side flow rate ≈ 1:2. Therefore, one-third of the total water volume 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 amount of water supplied to the heat exchangers 60 and 80 when the heat storage medium ME1 is low.
In the hot water supply unit 44, the heat supply pump is operated so that the detected temperature To1 becomes a value (T1-5[°C]) lower than the detected temperature T1 by a certain temperature, for example, 5[°C] (second target temperature for heat exchange). 64 rotation speed is controlled. In other words, the rotation speed of the heat supply 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 opening degree of the mixing valve 68 is controlled to limit the amount of water flowing to the port a side. Thereby, the pressure loss due to the heat exchanger 60 can be reduced.
In order to reduce this 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 volume and port b side water volume (constant distribution volume)
The amounts of water to be set on the port a side and the port b side of the mixing valve 68 are fixed values. 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: Based on the opening of the mixing valve 68 when heat storage is capable of supplying hot water at the set temperature, the opening on the port a side is reduced to a predetermined value.
Although the opening of the mixing valve 68 changes according to the water supply temperature and the set temperature, the opening of the port a side is set to 1/2 based on the opening of the mixing valve 68 when the heat storage can supply hot water at the set temperature. or 1/3 of the opening.
For example, when heat storage can supply hot water at a set temperature, 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 like 11.

(3) Control pattern 3: In control pattern 2, the degree of opening of the mixing valve 68 is fixed at a predetermined value, but in control pattern 3, the degree of opening is changed according to the detected temperature To1. For example, when the water supply temperature is 20[°C] and the set temperature is 40[°C], the a-side flow rate of the mixing valve 68: the b-side flow rate of 4:1 is used as a reference. 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 : change the distribution of the total water volume of the mixing valve 68 to 4; According to such a change in the amount of distribution, the closer the hot water HW obtained by the hot water supply unit 44 is to the set temperature, the more the amount of heating by the backup hot water supply unit 46 can be reduced, the pressure loss occurring on the backup hot water supply unit 46 side is small, and the water supply is As the temperature approaches, the amount of heating by the backup hot water supply unit 46 increases, resulting in an increase in pressure loss occurring in the backup hot water supply unit 46 .
That is, if the stored heat is a sufficient amount of heat to supply 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. By switching stepwise with the reduction of , not only the pressure loss due to the heat exchangers 60 and 80 can be reduced, but also the amount of fluctuation can be reduced.

In the case of FIG. 8, no matter which of the control patterns 1 to 3 is selected, in the backup hot water supply unit 46, the circulation pump 96 is operated, the burner 102 is burned, and the detected temperature Tj of the temperature sensor 100 is 80[° C.]. to control.
Since the detected temperature Ti2 of the temperature sensor 84 is a value (T1-5[°C]) lower than the detected temperature T1 by 5[°C] to Ti1[°C], the hot water HW and the detected temperature To2≈80[°C] The warm 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, if the set temperature is 40[°C] and Ti1=20[°C], then To1=35[°C] if T1=40[°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 throttled to 1/2), and the detected temperature Tm1 = 26[°C]. If the detected temperature Ti2 = 26 [°C], mixing with the detected temperature To2 ≈ 80 [°C], and if the opening of the mixing valve 88 is controlled to the detected temperature Tm2 = 40 [°C], c side flow rate: d side Flow rate ≈ 1:3. Therefore, two-fifths of the total water volume will be affected by heat exchanger 60 and one-fourth by heat exchanger 80 . With this control pattern, the pressure loss is smaller than when the stored heat can supply hot water at the set temperature.

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

After the initialization (S104), the battery control unit 104 receives ON/OFF of the operation switch through the input reception process (S102), and shifts to the heat recovery process (S105) shown in FIG. Information is provided to the remote controller 110 .
After the initialization (S106), the hot water supply unit control section 106 receives an instruction of the set temperature through the input reception process (S102), proceeds to the 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 for the set temperature through the input acceptance process (S102), proceeds to the backup hot water supply process (S109) shown in FIG. Provided to the remote controller control unit 110 .

<Heat recovery treatment>
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 controller 110 is monitored (S201), and 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 becomes, 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 processing>
FIG. 11 shows the 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 supply is used (S301). If hot water supply is not used (NO in S301), the heat pump 64 is stopped (S302), and this process ends.
If hot water is to be supplied (YES in S301), it is determined whether the detected temperature T1 is equal to or higher than the 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 A of FIG. 7 is executed (S304). In this process, the rotation of the heat pump 64 is controlled so that the detected temperature To1 is higher than the set temperature by a certain temperature ΔT, for example, 5° C. (=set temperature+ΔT) (S305). is the set temperature (S306).

If the detected temperature T1 is not higher than the temperature at which the set temperature can be supplied (NO in S303), it is checked whether the detected temperature T1 is higher than the water supply temperature by a certain temperature ΔT, for example, 5°C (=water supply temperature + ΔT). It judges (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 certain temperature ΔT, for example, 5° C. (=T1 temperature−ΔT) (S309). The opening degree of the valve 68 is controlled (S310). The opening control of this 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 C of FIG. 7 is executed (S311). In this process, the heat supply pump 64 is stopped (S312), and the mixing valve 68 is controlled so that 100[%] water flow is obtained at the port b (S313).

<Opening Control 1 of Mixing Valve 68>
12A shows opening control 1 of the mixing valve 68. FIG. 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 control 2 of the mixing valve 68 . In this control 2, the detected temperature To1 is the set temperature +T, and the opening ratio of the ports a and b at which the detected temperature Tm1 becomes the set temperature is calculated from the water supply temperature and the hot water HW at the detected temperature To1 (S501). Let this opening 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 of the mixing valve 68 is controlled so that the opening is halved and the ratio of the opening of the ports a and b is a:b=x/2:(y+x/2).

<Opening Control 3 of Mixing Valve 68>
FIG. 13A shows opening control 3 of the mixing valve 68 . In this control 3, the detection temperature To1 is the set temperature +T, and the opening ratio of the ports a and b at which the detection temperature Tm1 becomes the set temperature is calculated from the water supply temperature and the hot water HW at the detection temperature To1 (S601). Let this opening 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 also changed according to the detected temperature T1.
For example, at high temperatures, a:b=x/2:(y+x/2), and
At medium temperature, a:b=x/3:(y+2x/3), and
At low temperatures a:b=x/4:(y+3x/4)
, the opening of the mixing valve 68 is controlled.

<Backup hot water processing>
FIG. 14 shows the procedure of the backup hot water supply process. In this processing procedure, it is determined whether 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 hot water supply is not used (NO in S801), the hot water supply operation is stopped (S802), and this backup hot water supply process is terminated.
If hot water supply is 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 shifts to feedwater heating, and the circulation pump 96 is operated at a rotation speed 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 amount of water on the port d side becomes 100[%].

<Effect of Example 1>
According to this Example 1, the following effects are obtained.
(1) The amount of heat stored in the heat storage tank 8 can be used to supply hot water.
(2) When heat storage is low and cannot be used for hot water supply, the backup hot water supply unit 46 heats the water supply W that has passed through the hot water supply unit 44 to a set temperature so that hot water can be supplied at the set temperature.
(3) When the temperature of the feed water W cannot be raised to the set temperature, but heat can be exchanged to some extent, the amount of feed water flowing to the heat exchanger 60 is suppressed to reduce the pressure loss and the rotation speed of the heat supply pump 64. can be suppressed, and efficient heat storage utilization can be achieved.
(4) When the heat storage is low, forced circulation of the heat medium 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 Embodiment 1, the hot water supply unit 44 and the heat storage tank 8 are installed, but as shown in FIG. The same control can be performed even if the hot water supply unit 45 is included.

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 configured separately, but as shown in FIG. 16, the same control can be performed by configuring a hot water supply unit 47 in which the hot water supply unit 44 and the backup hot water supply unit 46 are integrated. It is possible.

In the above embodiment, the hot water supply unit 44 and the backup hot water supply unit 46 are configured independently, but the hot water supply unit 44, the backup hot water supply unit 46, and the respective controllers may be integrated as a hot water supply apparatus.

[Other embodiments]
(1) In the above-described embodiment, the configuration in which the water amount adjustment unit 12 is provided with the mixing valve 68 and the configuration in which the water amount adjustment unit 38 is provided with the mixing valve 88 are exemplified. A proportional valve may be provided to regulate the flow rate.
(2) Although the fuel cell 48 is illustrated as the 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 for the heat medium ME2, other heat sources such as electric heat may be used.

As described above, the most preferable embodiment and the like of the present invention have been described. The invention is not limited to the above description. Various modifications and changes are possible for those skilled in the art based on the gist of the invention described in the claims or disclosed in the detailed description. 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 in a heat medium, and hot water supply control is performed according to the heat storage in the heat medium. If it is low, the pressure loss and power loss for circulation can be reduced by reducing the amount of water flowing to the heat exchanger, and excellent effects such as not disturbing stratified heat storage in the heat storage tank can be obtained, which is beneficial. is.

2 hot water supply system 4 hot water supply unit 6 auxiliary heating unit 8 heat storage tank 9 pump 10 heat exchanger 12 water volume adjustment unit 14 water supply pipe 16 bypass pipe 18 hot water discharge 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 volume adjustment 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 exchanger 62 circulation path 64 heat supply pump 66 temperature sensor 68 mixing valve 70 water amount sensor 72 temperature sensor 74 water control valve 76, 78 temperature sensor 80 plate heat exchanger 82 heat exchanger 84 temperature sensor 85 water amount sensor 86 water control valve 88 mixing valve 90, 92 temperature sensor 94 circulation path 96 circulation pump 98 open tank 100 temperature sensor 102 burner 104 battery control section 106 hot water supply unit control section 108 backup control section 110 remote control section 112, 120, 128 processor 114, 122, 130 Memory section 116, 124, 132 Input/output section (I/O)
118, 126, 134 system communication unit

Claims (12)

A hot water supply system in which a heat medium is stored in a heat storage tank and the heat of the heat medium is heat-exchanged with water supply,
a heat exchanger that heat-exchanges the heat medium with feed water;
a first temperature sensor that detects the temperature of the heat medium;
a second temperature sensor that detects the temperature of the feed water heat-exchanged by the heat exchanger;
water volume adjusting means for adjusting the distribution volume of the feed water to be distributed to the heat exchanger and the bypass;
a pump for circulating the heat medium from the heat storage tank to the heat exchanger;
When it is determined from the detected temperature of the heat medium that it is possible to supply hot water at the set temperature, the feed water is distributed to the heat exchanger and the bypass at a first distribution ratio, and the detected temperature of the second temperature sensor is set to the above The rotation speed of the pump is controlled so that the temperature is higher than the set temperature by a predetermined temperature, and when it is determined from the detected temperature of the heat medium that the hot water cannot be supplied at the set temperature , the temperature is detected by the second temperature sensor. The feed water is distributed at a second distribution ratio in which the distribution amount to the heat exchanger is stepwise reduced from the first distribution ratio according to the temperature of the feed water, and the first temperature sensor If the detected temperature of the heat medium is higher than the water supply temperature, the detected temperature of the second temperature sensor is set to a temperature lower than the detected temperature of the first temperature sensor by the same or different temperature as the predetermined temperature. A control unit that controls the rotation speed of the pump so that
A hot water supply system comprising: Further, the controller controls the rotation speed of the pump so that the temperature detected by the second temperature sensor is lower than the temperature detected by the first temperature sensor by a temperature equal to or different from the predetermined temperature. is when it is determined from the detected temperature of the heat medium that hot water supply at the set temperature cannot be performed, and the detected temperature of the heat medium is higher than the water supply temperature by the same or different temperature as the predetermined temperature. The hot water supply system according to claim 1. 3. The hot water supply system according to claim 1, wherein the heat source for heating the heat medium in the heat storage tank further comprises a fuel cell unit for heat-exchanging exhaust heat of a fuel cell with the heat medium. . A hot water supply control method for storing a heat medium in a heat storage tank and exchanging heat of the heat medium with water supply,
a heat exchanger heat-exchanging the heat medium with feedwater;
a first temperature sensor detecting the temperature of the heat medium;
a second temperature sensor detecting the temperature of the feed water heat-exchanged in the heat exchanger;
a step of adjusting a distribution amount of the feed water to be distributed to the heat exchanger and the bypass passage by the water amount adjusting means;
A pump circulating the heat medium from the heat storage tank to the heat exchanger;
When the controller determines from the detected temperature of the heat medium that it is possible to supply hot water at the set temperature, the water supply is distributed to the heat exchanger and the bypass at a first distribution ratio, and the second temperature sensor detects the temperature. The rotation speed of the pump is controlled so that the detected temperature is higher than the set temperature by a predetermined temperature, and when it is determined from the detected temperature of the heat medium that hot water supply at the set temperature cannot be performed, the second temperature sensor Distributing the feed water at a second distribution ratio in which the distribution amount to the heat exchanger is stepwise reduced from the first distribution ratio according to the temperature of the feed water detected in the first If the temperature detected by the temperature sensor of the heat medium is higher than the temperature of the feed water, the temperature detected by the second temperature sensor is the same as or different from the predetermined temperature than the temperature detected by the first temperature sensor. A step of controlling the rotation speed of the pump so that the temperature is lower by
A hot water supply control method comprising: Further, the controller controls the rotation speed of the pump so that the temperature detected by the second temperature sensor is lower than the temperature detected by the first temperature sensor by a temperature equal to or different from the predetermined temperature. is when it is determined from the detected temperature of the heat medium that hot water supply at the set temperature cannot be performed, and the detected temperature of the heat medium is higher than the water supply temperature by the same or different temperature as the predetermined temperature. The hot water supply control method according to claim 4. 6. The hot water supply control method according to claim 4, further comprising the step of exchanging exhaust heat of the fuel cell with the heat medium in the fuel cell unit to heat the heat medium. A water heater that stores a heat medium in a heat storage tank and heat-exchanges the heat of the heat medium with water supply,
a heat exchanger that heat-exchanges the heat medium with feed water;
a first temperature sensor that detects the temperature of the heat medium;
a second temperature sensor that detects the temperature of the feed water heat-exchanged by the heat exchanger;
water volume adjusting means for adjusting the distribution volume of the feed water to be distributed to the heat exchanger and the bypass;
a pump for circulating the heat medium from the heat storage tank to the heat exchanger;
When it is determined from the detected temperature of the heat medium that it is possible to supply hot water at the set temperature, the feed water is distributed to the heat exchanger and the bypass at a first distribution ratio, and the detected temperature of the second temperature sensor is set to the above The rotation speed of the pump is controlled so that the temperature is higher than the set temperature by a predetermined temperature, and when it is determined from the detected temperature of the heat medium that the hot water cannot be supplied at the set temperature , the temperature is detected by the second temperature sensor. The feed water is distributed at a second distribution ratio in which the distribution amount to the heat exchanger is stepwise reduced from the first distribution ratio according to the temperature of the feed water, and the first temperature sensor If the detected temperature of the heat medium is higher than the water supply temperature, the detected temperature of the second temperature sensor is set to a temperature lower than the detected temperature of the first temperature sensor by the same or different temperature as the predetermined temperature. A control unit that controls the rotation speed of the pump so that
A hot water supply device comprising: Further, the controller controls the rotation speed of the pump so that the temperature detected by the second temperature sensor is lower than the temperature detected by the first temperature sensor by a temperature equal to or different from the predetermined temperature. is when it is determined from the detected temperature of the heat medium that hot water supply at the set temperature cannot be performed, and the detected temperature of the heat medium is higher than the water supply temperature by the same or different temperature as the predetermined temperature. The water heater according to claim 7, wherein Further, the heat source for heating the heat medium in the heat storage tank is provided with a fuel cell unit including a heat exchanger for heat-exchanging exhaust heat of the fuel cell with the heat medium. The water heater described in . A program for a computer to execute,
A function of capturing the detected temperature of the heat medium detected by the first temperature sensor;
A function of capturing the temperature of the feed water heat-exchanged in the heat exchanger detected by the second temperature sensor;
a function of adjusting the distribution amount of the feed water to be distributed to the heat exchanger and the bypass passage by the water amount adjusting means;
A function of circulating the heat medium from the heat storage tank to the heat exchanger by a pump;
When it is determined from the detected temperature of the heat medium that it is possible to supply hot water at the set temperature, the feed water is distributed to the heat exchanger and the bypass at a first distribution ratio, and the detected temperature of the second temperature sensor is set to the above The rotation speed of the pump is controlled so that the temperature is higher than the set temperature by a predetermined temperature, and when it is determined from the detected temperature of the heat medium that the hot water cannot be supplied at the set temperature , the temperature is detected by the second temperature sensor. The feed water is distributed at a second distribution ratio in which the distribution amount to the heat exchanger is stepwise reduced from the first distribution ratio according to the temperature of the feed water, and the first temperature sensor If the detected temperature of the heat medium is higher than the water supply temperature, the detected temperature of the second temperature sensor is set to a temperature lower than the detected temperature of the first temperature sensor by the same or different temperature as the predetermined temperature. A function of controlling the rotation speed of the pump so that
A program for realizing by a computer. Further, controlling the number of revolutions of the pump so that the temperature detected by the second temperature sensor is lower than the temperature detected by the first temperature sensor by a temperature equal to or different from the predetermined temperature is when it is determined that hot water cannot be supplied at the set temperature based on the detected temperature of the heat medium, and the detected temperature of the heat medium is higher than the temperature of the supplied water by the same or different temperature as the predetermined temperature. 10. The program according to 10. Further, according to claim 10 or claim 11, a computer realizes a function of controlling a fuel cell unit that exchanges heat of exhaust heat of a fuel cell with the heat medium in the heat storage tank to heat the heat medium in the heat storage tank. program as described.

Images