JP6960668B2 - Hot water supply system, hot water supply control program, hot water supply control method and hot water supply device - Google Patents

Description

The present invention relates to a control technique for a heat exchanger that exchanges heat from a heat medium in a heat storage tank with water supply.

The waste heat is exchanged with a heat medium, and this heat medium is stored in a heat storage tank to store heat. In this heat storage tank, a so-called hierarchical heat storage method is adopted in which a heat medium having a low temperature is heated from the lower layer side, the temperature is raised and the heat storage tank is returned to the upper layer side, and an ascending gradient is provided from the lower layer side to the upper layer side. In the use of heat storage 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 of the heat storage tank is heat-exchanged with the water supply, a shortage of heat occurs when the water supply is heated to the set temperature depending on the heat storage amount of the heat storage tank. It is known that this insufficient amount of heat is compensated by an auxiliary heating source to raise the hot water temperature to a set temperature (Patent Document 1).

Japanese Unexamined Patent Publication No. 2011-214793

By the way, the technique described in Patent Document 1 can efficiently utilize the heat storage of the heat storage tank for water supply heating, and its practicality is highly evaluated.
However, even when the heat storage in the heat storage tank is small, if the heat is to be fully utilized for heating the water supply, the circulation amount of the heat medium will be increased to the utmost with respect to the water supply 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.
Further, disturbing the stratified state of the hierarchical heat storage in the heat storage tank has a problem that the heat storage utilization efficiency is lowered even if the heat exchange efficiency is high.
Therefore, in view of the above problems, an object of the present invention is to improve the utilization efficiency of heat storage, reduce the pressure loss, and 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, the hot water supply system includes a heat storage tank for storing a heat medium and a heat exchanger for exchanging heat of the heat medium with water. a temperature sensor for detecting the temperature of the heating medium circulating in the heat exchanger, the water was dispensed into the flow path and the bypass path of the heat exchanger side, the distribution amount to be supplied to the flow path and the bypass path of the water supply At the same time, the amount of water is adjusted to generate hot water by merging the water supply that has been heat-exchanged with the heat medium by the heat exchanger and the water supply that has flowed through the bypass path at the confluence of the flow path and the bypass path. means, a pump for circulating the heating medium which has been the feedwater and heat exchange distribution to the heat exchanger to the heat exchanger through the circulating passage from the heat storage tank, is installed downstream from the merging portion, the amount of water an auxiliary heating unit that heats by receiving the hot water generated by the adjustment of the adjustment means, whether tapping is possible at the first predetermined temperature is determined by detecting the temperature of the heating medium, hot water by the first set temperature triggered by the became possible Na rather, the switch to the first predetermined temperature lower than the second predetermined temperature, the water amount adjusting means and the first said water distribution amount flowing in the heat exchanger is adjusted by The set temperature of the hot water is reduced from the time when the hot water is discharged, the water supply distributed to the heat exchanger is exchanged with the heat medium, and then mixed with the water supply flowing through the bypass path to generate the hot water. The auxiliary heating unit includes a control unit that heats the hot water when the temperature of the hot water is lower than the first set temperature.
In this hot water supply system, the temperature sensor, the water amount adjusting means, said pump including said control unit includes a hot water supply unit for tapping the water supply by the heat exchanger is converted into the hot water, the auxiliary heating unit, If the hot water outlet temperature of the hot water supply unit is lower than the first set temperature, the hot water may be heated to the first set temperature or another temperature to discharge the hot water.
In order to achieve the above object, according to one aspect of the hot water supply control program of the present invention, it is a hot water supply control program to be realized by a computer, and is detected from a temperature sensor that detects the temperature of the heat medium circulating in the heat exchanger. A function of acquiring the temperature and a function of distributing the water supply to the heat exchanger and the bypass path and controlling the distribution amount of the water amount adjusting means for adjusting the distribution amount of the water supply to the heat exchanger and the bypass path. The function of controlling the pump that circulates the heat medium that exchanges heat with the water supply from the heat storage tank to the heat exchanger through the circulation path, and whether hot water can be discharged at the first set temperature is determined by the detection temperature of the heat medium. and, triggered by that it became rather unable is tapping by the first set temperature, switch to the lower than the first predetermined temperature the second set temperature, the heat exchanger is adjusted by the amount of water adjustment means The amount of the flowing water supplied is reduced from the time when the hot water is discharged at the first set temperature, the water supplied to the heat exchanger is exchanged with the heat medium, and then mixed with the water supplied to the bypass path. and generating a temperature water and, when the generated the hot water is lower than the first predetermined temperature, thereby realizing the function of heating the hot water in the auxiliary heating unit to the computer.

In order to achieve the above object, according to one aspect of the hot water supply control method of the present invention, it is a hot water supply control method using a heat storage tank for storing a heat medium and a heat exchanger for exchanging heat of the heat medium with water supply. , A step of detecting the temperature of the heat medium circulating in the heat exchanger, and distribution of water supply to the heat exchanger and the bypass path by a water amount adjusting means, and flowing the water supply to the heat exchanger and the bypass path. Depending on the temperature of the heat medium, the step of adjusting the amount, the step of circulating the heat medium that exchanges heat with the water supply from the heat storage tank to the heat exchanger through the circulation path, and whether hot water can be discharged at the first set temperature. a step of determining, as triggered by tapping becomes rather is unable at the first set temperature, switch to the lower than the first predetermined temperature the second set temperature, said adjusted by the amount of water adjustment means The amount of the water supply flowing to the heat exchanger was reduced from the time when the hot water was discharged at the first set temperature, and the water supply distributed to the heat exchanger was heat-exchanged with the heat medium before flowing into the bypass path. wherein comprising a step of water and mixed to produce a warm water, when the generated the hot water is lower than the first predetermined temperature, and a step of heating the hot water in the auxiliary heating unit.
In this hot water supply control method further includes the step of tapping the water supply by the heat exchanger is converted into the hot water, if the hot water temperature is below the first predetermined temperature, the said hot water first set temperature Alternatively, it may include a step of heating to another temperature to generate hot water.

In order to achieve the above object, according to one aspect of the hot water supply device of the present invention, the hot water supply device includes a heat storage tank for storing a heat medium and a heat exchanger for exchanging heat of the heat medium with water. a temperature sensor for detecting the temperature of the heating medium circulating in the heat exchanger, the water was dispensed into the flow path and the bypass path of the heat exchanger side, the distribution amount to be supplied to the flow path and the bypass path of the water supply At the same time, the amount of water is adjusted to generate hot water by merging the water supply that has been heat-exchanged with the heat medium by the heat exchanger and the water supply that has flowed through the bypass path at the confluence of the flow path and the bypass path. Means, a pump that circulates the heat medium that exchanges heat with the water supply from the heat storage tank to the heat exchanger through a circulation path, and a pump that is installed downstream from the confluence and is generated by adjustment by the water amount adjusting means. was an auxiliary heating unit that heats by receiving the hot water, that if tapping is possible at the first predetermined temperature is determined by detecting the temperature of the heating medium, was rather unable is tapping by the first set temperature As an opportunity , the temperature is switched to the second set temperature lower than the first set temperature, and the distribution amount of the water supply flowing to the heat exchanger adjusted by the water amount adjusting means is reduced from the time when the hot water of the first set temperature is discharged. The water supply distributed to the heat exchanger is heat-exchanged with the heat medium and then mixed with the water supply flowing through the bypass path to generate the hot water, and the generated hot water is the first. The auxiliary heating unit is provided with a control unit that heats the hot water when the temperature is lower than the set temperature of.
In this water heater, the auxiliary heating unit includes a water heater separate from or integral with claim 6, wherein if the water heater the hot water temperature is lower than the first set temperature, said from said water heater water or by heating the hot water to the first set temperature or other temperature may then tapped.

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

(1) Even if the heat storage in the heat storage tank does not reach the amount of heat required to discharge 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 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 a heat medium in a heat exchanger, but since the amount of circulation can be reduced, excessive rotation of the pump rotation speed of the circulation pump can be suppressed, and consumption by the circulation pump. Power can be suppressed.
(4) When the heat storage 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, so the stratified state of the heat medium is not disturbed and the amount of heat medium heat is not disturbed. Can be used efficiently.

It is a figure which shows the hot water supply system which concerns on one Embodiment. It is a figure for demonstrating the temperature control of a hot water supply part. It is a flowchart which shows the processing procedure of hot water supply control. It is a figure which shows the hot water supply system which concerns on Example 1. FIG. It is a block diagram which shows the control system. A is a table showing the water supply temperature when the hot water supply set temperature Ts1 = 35 [° C.] is obtained, the temperature after heat exchange, the amount of heat exchange and the minimum heat medium temperature, and B is the table when the hot water supply set temperature Ts1 = 40 [° C.] is obtained. Table showing water supply temperature, temperature after heat exchange, heat exchange amount and minimum heat medium temperature, C is water supply temperature when hot water supply set temperature Ts1 = 45 [° C] is obtained, heat exchange temperature, heat exchange amount and minimum heat medium It is a table showing the temperature. It is a figure which shows the minimum heat medium temperature with respect to the water supply temperature when the hot water supply set temperature is a parameter. It is a figure for demonstrating the hot water supply operation corresponding to heat storage. It is a flowchart which shows the processing procedure of a hot water supply system comprehensively. It is a flowchart which shows the processing procedure of a fuel cell unit. It is a flowchart which shows the processing procedure of a hot water supply unit. It is a flowchart which shows the processing procedure of a backup hot water supply unit. It is a figure which shows the pressure loss with respect to the passing flow rate ratio. It is a figure which shows the hot water supply system which concerns on Example 2. 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 is provided with a hot water supply unit 4 and an auxiliary heating unit 6. The hot water supply unit 4 exchanges heat from 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 has 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 hot water HW at the set temperature is used. To take a 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 amount adjusting 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 circulates and is heated to the heat source side (not shown), and the heated 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 in which the heat storage tank 8 rises from the lower layer to the upper layer.
The pump 9 is operated when the heat of the heat medium ME1 is exchanged with the water supply W, and the heat medium ME1 is circulated in the heat exchanger 10.
For the heat exchanger 10, for example, a plate heat exchanger is used. 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 circulates to the heat exchanger 10 through the circulation path 13 by operating the pump 9, and after the heat exchange, the lower layer of the heat storage tank 8 Returned to the side.

The water amount adjusting unit 12 is an example of the water amount adjusting means of the heat exchanger 10, distributes the water supply W to the heat exchanger 10 and the bypass pipe 16 which is an example of the bypass path, and adjusts the water flow amount 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 adjusting unit 12, or flows from the bypass pipe 16 to the hot water outlet pipe 18. 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 water supply W flowing through the heat exchanger 10 and the bypass pipe 16 is adjusted.
The temperature of the heat medium ME1 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, which is a mixture of the hot water HW of the hot water outlet pipe 18 and the water supply W of the bypass pipe 16, is detected by the temperature sensor 24.

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

The control unit 20 determines whether hot water can be discharged at the first set temperature Ts1 based on the detection temperature of the heat medium ME1, and if hot water cannot be discharged at the set temperature Ts1, the second set temperature Ts2 (<Ts1) lower than the set temperature Ts1. ), And the distribution amount of the water supply W flowing to the heat exchanger 10 adjusted by the water amount adjusting unit 12 is reduced from the time when the hot water of the set temperature Ts1 is discharged. The set temperature Ts1 is, for example, a temperature arbitrarily set by the user from the remote control device and is stored in the storage means. On the other hand, the set temperature Ts2 is a temperature set by the determination of the control unit 20, is stored in the storage means, and is read out as needed.

According to the hot water supply system 2, the hot water HW in which the water supply W is heated by heat exchange with the heat medium ME1, that is, the hot water HW having a temperature (Ts1 + α1) higher than the set temperature Ts1 by a predetermined temperature α1 (for example, 6 [° C.]). And the unheated water supply W are mixed, and hot water is supplied at the set temperature Ts1.
Regarding this control, reference is made to FIG. 2 which summarizes the hot water supply unit 4.
a) The rotation speed of the pump 9 is controlled so that the detected temperature To1 (temperature after heat exchange), which is the temperature of the hot water HW after passing through the heat exchanger 10, becomes the temperature (Ts1 + α1). If To1> (Ts1 + α1), the rotation speed of the pump 9 is decreased, and if To1 <(Ts1 + α1), the rotation speed of the pump 9 is increased.
b) Regarding the flow path of the water amount adjusting unit 12, if the heat exchanger 10 side port of the mixing valve M1 is route A and the bypass pipe 16 side port of the mixing valve M1 is route B, the detection temperature Tm1 becomes the set temperature Ts1. As described above, the flow rate ratio (mixing ratio) of the A route and the B route is controlled.
Since the relationship between the detection temperature To1 and the detection temperature Ti1 of the water supply W is usually To1> Ti1, in the control of the flow rate ratio, if Tm1> Ts1, the flow rate ratio of the B route is increased, and if Tm1 <Ts1. , Control is performed to increase the flow rate ratio of Route A.

Here, when the detection temperature T1 of the heat medium ME1 decreases, the rotation speed of the circulation pump 9 increases due to the control of a), and the detection temperature T1 decreases to a temperature at which the detection temperature To1 cannot maintain the temperature (Ts1 + α1). In the transition to, the rotation speed of the circulation pump 9 reaches the upper limit rotation speed.
In the control of b), if the detection temperature To1 is maintained at the temperature (Ts1 + α1), the control continues, but as the detection temperature To1 decreases, the flow rate ratio of the A route increases, and finally A The flow rate ratio of the route will reach 100 [%].
In order to improve the increase in the number of rotations of the pump 9, in Patent No. 55777135, when the detection temperature T1 falls below the predetermined temperature, the detection temperature To1 becomes the predetermined temperature α2 (for example, 5 [° C.]) from the detection temperature T1. It is controlled so that the temperature is as low as possible, that is, the detection temperature To1 = (T1-α2). This makes it possible to prevent an excessive increase in the rotation speed of the pump 9. However, when mixing control is performed so that the detected temperature Tm1 becomes the set temperature Ts1, the flow rate ratio of the A route increases as the detected temperature To1 decreases, and the pressure loss of the water supply W tends to increase. Become.

Therefore, at the control switching timing, the set temperature Ts1 is switched to the lower set temperature Ts2, and the set temperature Ts2 is switched to a temperature between the detection temperature To1 and the detection temperature Ti1 as a feasible temperature. As the set temperature Ts2, for example
Ts2 = (To1 + Ti1) / 2 = (T1-α2 + Ti1) / 2
When switched to, the flow rate ratio of the A route and the B route becomes 50 [%].
In the control for switching from the set temperature Ts1 to Ts2 in this way, hot water supply control for controlling the mixing valve M1 can be used in combination while preventing hunting or the like so that the detected temperature Tm1 becomes a predetermined temperature.
Therefore, the set temperatures Ts1 and Ts2 are switched by the detection temperature T1 of the heat medium ME1 of the heat storage tank 8, and hot water is supplied by the hot water supply unit 4, hot water supply by the hot water supply unit 4 and the auxiliary heating unit 6, and hot water supply only by the auxiliary heating unit 6. ..
(1) When the heat supply W can be heated to the set temperature Ts1 by the heat medium ME1: Hot water supply at the set temperature Ts1 can be performed only by the hot water supply unit 4 without using the auxiliary heating by the auxiliary heating unit 6.
(2) When the detection temperature T1 of the heat medium ME1 is higher than the temperature of the water supply W, but the water supply W cannot be heated to the set temperature Ts1: It is possible to supply hot water at the set temperature Ts1 by using the auxiliary heating by the auxiliary heating unit 6. be.

(3) The detection temperature T1 of the heat medium ME1 is the same as the temperature of the water supply W, and even if the heat medium ME1 exchanges heat with the water supply W, the water supply W cannot be heated, that is, when the heat medium ME1 does not store heat: It is possible to supply hot water at the set temperature Ts1 only by the auxiliary hot water supply unit 6 without using the heating by the hot water supply unit 4. In this control, switching between the above (1) and the above (2) may use, for example, the relationship between the water supply temperature and the minimum heat medium temperature shown in FIG. 7. In (3) above, the relationship of the heat medium detection temperature ≤ (water supply temperature + α2) may be used.
In such control, the mixing valve M1 is normally controlled so that the hot water discharge temperature becomes the set temperature Ts1, but the hot water cannot be discharged at the set temperature Ts1 under certain conditions, that is, the heat storage of the heat medium ME1. The set temperature Ts1 is switched to a lower set temperature Ts2, and the mixing ratio of the mixing valve M1 is forcibly changed by the set temperature Ts2.

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

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

<Effect of one embodiment>
According to this embodiment, the following effects can be obtained.
(1) When the hot water HW having the set temperature Ts1 cannot be obtained in the hot water supply unit 4, the set temperature Ts1 is switched to the lower set temperature Ts2 to suppress the amount of water flowing to the heat exchanger 10 on the hot water supply unit 4, so that the heat exchanger is used. The pressure loss due to 10 can be reduced.
(2) When the hot water HW having the set temperature Ts1 cannot be obtained by the hot water supply unit 4, the hot water HW having been heated to the set temperature Ts1 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 improved, and the stratified state on the heat storage tank 8 side is not disturbed.

FIG. 4 shows a hot water supply system according to the first embodiment. In FIG. 4, the same parts as those in FIG. 1 are designated 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 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 uses heat generated during power generation as a heat source. The heat exchanger 50 exchanges heat from 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, and at the time of driving, the heat medium ME1 is circulated to the heat exchanger 50 from the lower layer side of the heat storage tank 8, and the heat medium ME1 after the heat exchange is circulated in the heat storage tank 8. Return to the upper layer side.
During power generation of the fuel cell 48, the circulation pump 52 is driven, the heat medium ME1 is circulated to the heat exchanger 50 from the lower layer side of the heat storage tank 8, the heat of the exhaust ME3 is exchanged with the heat medium ME1, and the heated heat is exchanged. The medium ME1 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 entrance 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 is provided with a plate heat exchanger 60 together with a heat storage tank 8. A heat pump 64 and a temperature sensor 22 are provided in the circulation path 62 through which the heat medium ME1 of the heat storage tank 8 flows through 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. The temperature sensor 22 detects the temperature of the heat medium on the upper layer side of the heat storage tank 8. The temperature sensor 66 installed in the heat storage tank 8 detects the temperature of the heat medium ME1 in the tank.
A water pipe or the like is connected to the water supply pipe 14, and the water supply W is supplied. The water supply pipe 14 is provided with a mixing valve 68, a water amount sensor 70, and a temperature sensor 72, and a hot water outlet pipe 18 is connected via the mixing valve 68 and the bypass pipe 16. The hot water outlet pipe 18 is provided with a water control valve 74 and temperature sensors 76 and 78. The bypass pipe 16 allows the water supply W divided by the mixing valve 68 to flow into the hot water outlet pipe 18. The water control valve 74 controls the amount of hot water HW or water supply W discharged from the hot water pipe 18. The temperature sensor 76 detects the temperature of hot water on the outlet side of the plate heat exchanger 60. The temperature sensor 78 detects the temperature of the hot water HW that is a mixture of the hot water HW and the water supply W.

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

<Control unit 20 of hot water supply system 2>
FIG. 5 shows the control unit 20 (FIG. 1) of the hot water supply system 2. The control unit 20 includes a battery control unit 104, a hot water supply unit control unit 106, a backup control unit 108, and a remote control unit 110. The battery control unit 104 controls the fuel cell unit 42. The hot water supply unit control unit 106 controls the hot water supply unit 44. The backup control unit 108 controls the backup hot water supply unit 46. The remote control unit 110 is provided in the remote control device, and is linked to the battery control unit 104, the hot water supply unit control unit 106, and the 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. 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 sends 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 detected temperatures of the temperature sensors 56 and 58 are input to the I / O 116 as control information, and the control output of the circulation pump 52 is obtained.

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

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

<When hot water can be supplied at the set temperature Ts1 with the heat medium ME1>
FIG. 8A shows an operation when the hot water supply unit 44 can supply hot water at a set temperature Ts1 with the heat medium ME1. In A of FIG. 8, the thick line shows the flow of the water supply W, the hot water HW, and the heat medium ME1.
When hot water of the set temperature Ts1 can be supplied by the heat medium ME1, in the hot water supply unit 44, the detection temperature To1 (temperature after heat exchange) of the temperature sensor 76 is higher than the set temperature Ts1 by, for example, 6 [° C.] (Ts1 + 6 [° C.]. ]) (The first target temperature for heat exchange), the rotation speed of the heating pump 64 is controlled. 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 Ts1.

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

<When hot water cannot be supplied at the set temperature Ts1 with the heat medium ME1>
FIG. 8B shows a hot water supply operation when the hot water supply unit 44 cannot supply hot water at the set temperature Ts1 with the heat medium ME1. In B of FIG. 8, the thick line shows the flow of the water supply W, the hot water HW, and the heat media ME1 and ME2.
In this case, the rotation speed of the heating pump 64 is controlled so that the detection temperature To1 = (T1-5 [° C.]). When the target temperature of the detection temperature Tm1 is the normal set temperature Ts1, the flow rate ratio of the a route increases as the detection temperature To1 decreases, and finally the total amount of water is affected by the heat exchanger 60. Therefore, the target temperature of the detection temperature Tm1 is set to the temperature at which the a route and the b route of the mixing valve 68 are mixed. That is, the set temperature Ts1 is changed to the set temperature Ts2 (<Ts1) with respect to the detected temperature Tm1. The set temperature Ts2 may be a temperature lower than the set temperature Ts1. For example, when the set temperature Ts2 is controlled to To1 = (T1-5 [° C.]), first, the set temperature Ts2 = (Ti1 + (T1-5)). ) / 2 is set as the target temperature, the opening degree of the mixing valve 68 is adjusted, and the flow rate of each of the ports a and b is 50%. As a result, the pressure loss due to the water supply W flowing on the a route side can be reduced.

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

For example, when the set temperature Ts1 = 40 [° C.] and the detection temperature Ti1 = 20 [° C.], and the detection temperature T1 = 40 [° C.], the detection temperature To1 = 35 [° C.].
Here, the set temperature Ts2 is
(Ti1 + T1-5) / 2 = (20 + 35) / 2 = 27.5 [° C.]
If the target temperature of the detection temperature Tm1 is changed from the set temperature Ts1 to the set temperature Ts2, the a-side flow rate and the b-side flow rate of the mixing valve 68 become the a-side flow rate: b-side flow rate = 50:50, and the detection temperature Tm1 = 27.5 [° C.].
Since the detection temperature Ti2 is 27.5 [° C.], when mixing with hot water HW having a detection temperature To2 ≈80 [° C.] and controlling the detection temperature Tm2 to 40 [° C.], the flow rate on the port c side of the mixing valve 88, The flow rate on the port d side is the flow rate on the port c side: the flow rate on the port d side ≈ 24:76. Therefore, 50% of the total amount of water is affected by the heat exchanger 60, and about 24% of the total amount of water is affected by the heat exchanger 80. As a result, the pressure loss due to the heat exchangers 60 and 80 is reduced.

<When heat exchange by the heat medium ME1 is not possible>
FIG. 8C shows the operation when heat exchange by the heat medium ME1 is not possible. In C of FIG. 8, the thick line shows the flow of the water supply W and the heat medium ME2.
When heat exchange by the heat medium ME1 is not possible, the hot water supply unit 44 has a 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 water supply W to the port b side. , The heat supply pump 64 is stopped. In this case, the detection temperature Tm1 becomes the detection temperature Ti1.

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

For example, at the set temperature Ts1 = 40 [° C.] and the detection temperature Ti1 = 20 [° C.], if the detection temperature T1 = 20 [° C.], the heating pump 64 is stopped.
At this time, 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 port a side flow rate: port b side flow rate = 0: 1. At this time, 100 [%] of the total flow rate flows to the port b side.
Since the detection temperature Ti2 = Tm1 = Ti1 = 20 [° C.], mixing with the detection temperature To2 ≈80 [° C.] and controlling the detection temperature Tm2 to the set temperature Ts1 = 40 [° C.], the flow rate on the port c side of the mixing valve 88 The ratio of the flow rate on the port d side is the flow rate on the port c side: the flow rate on the port d side ≈ 1: 2.
Therefore, 1/3 of the total amount of water is affected by the heat exchanger 80, and no pressure loss due to the heat exchanger 60 occurs.

<Control of hot water supply system 2>
FIG. 9 shows a processing procedure for controlling 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 with each other.
After the initialization (S101), the remote control control unit 110 repeatedly executes the input reception process (S102) and the display output process (S103). In the display output process, the state 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 the LCD (Liquid Crystal Display).

After the initialization (S104), the battery control unit 104 receives ON / OFF of the operation switch by the input reception process (S102), shifts to the heat recovery process (S105) shown in FIG. 10, and is in a state obtained by this heat recovery process. Information is provided to the remote control unit 110.
After the initialization (S106), the hot water supply unit control unit 106 receives an instruction of the set temperature Ts1 by the input reception process (S102), shifts to the hot water supply process (S107) shown in FIG. 11, and obtains the state information obtained by this hot water supply process. It is provided to the remote control unit 110.
After the initialization (S108), the backup control unit 108 receives an instruction of the set temperature Ts1 by the input reception process (S102), shifts to the backup hot water supply process (S109) shown in FIG. 12, and the state information obtained by this backup hot water supply process. To the remote control 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 reception process (S102) of the remote control unit 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.] (S203).
If the operation switch is OFF (NO in S201), the fuel cell 48 is stopped (S204) and the circulation pump 52 is stopped (S205).

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

Unless the detection temperature T1 is equal to or higher than the temperature at which the set temperature Ts1 can be supplied (NO in S303), the detection temperature T1 exceeds a constant temperature ΔT2, for example, 5 [° C.] higher than the water supply temperature (= water supply temperature + ΔT2). It is determined whether or not the temperature is high (S307). If the detected temperature T1 exceeds the temperature (= water supply temperature + ΔT2) (YES in S307), the hot water supply process shown in B of FIG. 8 is executed (S308).
In this process, the rotation of the heating pump 64 is controlled (S309) so that the detection temperature To1 becomes a constant temperature ΔT2 lower than the detection temperature T1, for example, 5 [° C.] lower (= T1 temperature −ΔT2), and is detected at the same time. The target temperature of the temperature Tm1 is calculated (S310).
In this process, the target temperature is calculated from the detection temperature To1 (= T1-ΔT2) and the detection temperature Ti1 of the water supply W. For example, the first target temperature may be (To1 + Ti1) / 2, or the second target temperature may be (To1 + Ti1 + Ti1) / 3.
Then, the mixing valve 68 is controlled so that any of these target temperatures can be obtained (S311).

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

<Backup hot water supply process>
FIG. 12 shows a processing procedure of the backup hot water supply processing. In this processing procedure, it is determined whether or not 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 Ts1 (S803). If the detected temperature Ti2 is lower than the set temperature Ts1 (YES in S803), the process shifts to water supply 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 detection 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 Ts1 (S806).
If the detection temperature Ti2 is equal to or higher than the set temperature Ts1 (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 is 100 [%] on the port d side.

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

<Effect of Example 1>
According to this Example 1, the following effects can be obtained.
(1) The amount of heat can be used for hot water supply according to the heat storage of the heat storage tank 8.
(2) When the heat storage is low and cannot be used for hot water supply, the water supply W that has passed through the hot water supply unit 44 is heated to the set temperature Ts1 by the backup hot water supply unit 46, and hot water can be supplied at the set temperature Ts1.
(3) The water supply W cannot be raised to the set temperature Ts1, but with heat storage that allows heat exchange to some extent, the amount of water supplied to the heat exchanger 60 is suppressed, pressure loss is reduced, and the heating pump 64 is rotated. The number 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.
(5) The opening ratio and the flow rate ratio of the mixing valve 68 are generally not in a proportional relationship. This is because it becomes difficult for the port side, which has a high pressure loss, to flow. This is because it is assumed that the flow rate ratio on the heat exchanger 60 side decreases when the flow rate is small in the opening degree control. In other words, assuming such a phenomenon, the utilization rate of the heat storage of the heat storage tank 8 decreases, but in such control, the flow rate flowing to the heat exchanger 60 side is compensated, and the heat storage can be effectively used.

FIG. 14 shows a hot water supply system according to the second embodiment. In the first embodiment, the heat storage tank 8 was installed in the hot water supply unit 44, but as shown in FIG. 15, the heat storage tank 8 was removed from the hot water supply unit 44, and the tank unit 43 and the heat storage tank 8 provided with the heat storage tank 8 were removed. Similar control is possible even if the hot water supply unit 45 is provided.

FIG. 15 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, but as shown in FIG. 16, the same control can be obtained even if the hot water supply unit 47 in which the hot water supply unit 45 and the backup hot water supply unit 46 are integrated is configured. 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 each control unit may be integrated as a hot water supply device.

[Other Embodiments]
(1) In the above embodiment, the configuration in which the water amount adjusting unit 12 is provided with the mixing valve M1 and the configuration in which the water amount adjusting unit 38 is provided with the mixing valve M2 are illustrated. You may adjust.
(2) Although the fuel cell 48 is illustrated as the heat source of the heat medium ME1, it may be an exhaust heat source such as an engine.
(3) Although the burner 102 is used as the heat source of the heat medium ME2, another heat source such as electric heat may be used.
(4) The memory units 122 and 130 may be provided with storage units for individually storing the set temperatures Ts1 and Ts2.
(5) In the above embodiment, when the set temperature Ts1 is switched to the set temperature Ts2, the hot water HW having the set temperature Ts1 is discharged from the auxiliary heating unit 6, but the present invention is not limited to this. Hot water HW having a temperature higher or lower than the set temperature Ts1 may be discharged from the auxiliary heating unit 6.
(6) Regarding the control of the hot water discharge temperature, the hot water discharge temperature may be controlled to the set temperature Ts1 by using the detection temperature of the temperature sensor 24, or the hot water discharge temperature may be controlled to the set temperature Ts1 by using the detection temperature of the temperature sensor 92. You may. In the latter case, when the piping from the hot water supply units 44 and 45 to the backup hot water supply unit 46 is long, the temperature drop of the hot water HW from the hot water supply units 44 and 45 can be backed up by the auxiliary heating of the backup hot water supply unit 46.

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 modifications can be made by those skilled in the art based on the gist of the invention described in the claims or disclosed in the form for carrying out the invention. Needless to say, such modifications and modifications 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, and hot water supply control is performed according to the heat storage of the heat medium. In this hot water supply control, the amount of water flowing through the heat exchanger is controlled according to the heat storage, and the heat storage is performed. When it is low, by reducing the amount of water flowing through the heat exchanger, pressure loss and power loss due to circulation can be reduced, and excellent effects such as not disturbing the stratified heat storage of 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 10 Heat exchanger 12 Water volume adjustment unit 14 Water supply pipe 16 Bypass pipe 18 Hot water outlet pipe 20 Control unit 22 Temperature sensor 24 Temperature sensor 26, 28 Heat exchanger 30 Water supply pipe 32 Temperature Sensor 34 Heat source 36 Bypass pipe 38 Water volume adjustment unit 40 Hot water 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 Instrument 62 Circulation path 64 Heat 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 Mixing 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 section (I / O)
118, 126, 134 System Communication Department

Claims (7)

A hot water supply system including a heat storage tank for storing a heat medium and a heat exchanger for exchanging heat from the heat medium with water.
A temperature sensor that detects the temperature of the heat medium circulating in the heat exchanger, and
The water distributed in the flow path and the bypass path of the heat exchanger-side, as well as adjust the distribution amount to be supplied to the flow path and the bypass path of the water supply, the heating medium and the heat exchanged the in the heat exchanger A water amount adjusting means for generating hot water by merging the water supply and the water supply flowing through the bypass path at the confluence of the flow path and the bypass path.
A pump that circulates the heat medium that exchanges heat with the water supply distributed to the heat exchanger from the heat storage tank to the heat exchanger through a circulation path.
And the merging unit is disposed downstream of the auxiliary heating unit that heats by receiving the hot water generated by the adjustment in the water adjusting unit,
Whether tapping is possible at the first predetermined temperature is determined by detecting the temperature of the heating medium, in response to it has become rather unable is tapping by the first predetermined temperature, lower than the first set temperature second The amount of water supplied to the heat exchanger adjusted by the water amount adjusting means is reduced from that at the time of hot water discharge at the first set temperature, and the water supplied to the heat exchanger is reduced. After exchanging heat with the heat medium, it is mixed with the water supply that has flowed through the bypass path to generate the hot water, and when the generated hot water is lower than the first set temperature, the auxiliary heating unit is used. A control unit that heats hot water and
A hot water supply system characterized by being equipped with. The temperature sensor, the water amount adjusting means, said pump including said control unit includes a hot water supply unit for hot water by converting the water in the hot water by the heat exchanger,
The auxiliary heating unit is characterized in that if the hot water outlet temperature of the hot water supply unit is lower than the first set temperature, the hot water is heated to the first set temperature or another temperature to discharge the hot water. The hot water supply system according to 1. It is a hot water supply control program to be realized by a computer.
A function to acquire the detected temperature from a temperature sensor that detects the temperature of the heat medium circulating in the heat exchanger,
A function of distributing the water supply to the heat exchanger and the bypass path, and controlling the distribution amount of the water amount adjusting means for adjusting the distribution amount of the water supply to the heat exchanger and the bypass path.
A function of controlling a pump that circulates the heat medium that exchanges heat with the water supply from the heat storage tank to the heat exchanger through a circulation path, and
Whether tapping is possible at the first predetermined temperature is determined by detecting the temperature of the heating medium, in response to it has become rather unable is tapping by the first predetermined temperature, lower than the first set temperature second The amount of water supplied to the heat exchanger adjusted by the water amount adjusting means is reduced from that at the time of hot water discharge at the first set temperature, and the water supplied to the heat exchanger is reduced. a function mixed with the water flowing in the bypass passage from the heating medium and is heat exchanged to produce hot water,
When the generated hot water is lower than the first set temperature, the auxiliary heating unit has a function of heating the hot water.
A hot water supply control program for realizing the above-mentioned computer. A hot water supply control method that uses a heat storage tank that stores a heat medium and a heat exchanger that exchanges heat from the heat medium with water.
A step of detecting the temperature of the heat medium circulating in the heat exchanger, and
A step of distributing the water supply to the heat exchanger and the bypass path by a water amount adjusting means, and adjusting the distribution amount of the water supply to the heat exchanger and the bypass path.
A step of circulating the heat medium that exchanges heat with the water supply from the heat storage tank to the heat exchanger through a circulation path.
A process of determining whether hot water can be discharged at the first set temperature based on the temperature of the heat medium, and
Triggered by the tapping becomes rather is unable at the first set temperature, switch to the lower than the first predetermined temperature the second set temperature, flows into the heat exchanger, which is adjusted by the amount of water adjustment means The distribution amount of the water supply is reduced from the time when the hot water is discharged at the first set temperature, the water supply distributed to the heat exchanger is exchanged with the heat medium, and then mixed with the water supply flowing through the bypass path. generating a warm water Te,
When the generated hot water is lower than the first set temperature, the step of heating the hot water with the auxiliary heating unit and the step of heating the hot water.
A hot water supply control method characterized by including. Further, the step of tapping by converting the feedwater to the hot water by the heat exchanger,
If the hot water temperature is lower than the first set temperature, the step of heating the hot water to the first set temperature or another temperature to make the hot water flow out.
The hot water supply control method according to claim 4, wherein the hot water supply control method comprises. A hot water supply device including a heat storage tank for storing a heat medium and a heat exchanger for exchanging heat from the heat medium with water.
A temperature sensor that detects the temperature of the heat medium circulating in the heat exchanger, and
The water distributed in the flow path and the bypass path of the heat exchanger-side, as well as adjust the distribution amount to be supplied to the flow path and the bypass path of the water supply, the heating medium and the heat exchanged the in the heat exchanger A water amount adjusting means for generating hot water by merging the water supply and the water supply flowing through the bypass path at the confluence of the flow path and the bypass path.
A pump that circulates the heat medium that exchanges heat with the water supply from the heat storage tank to the heat exchanger through a circulation path.
And the merging unit is disposed downstream of the auxiliary heating unit that heats by receiving the hot water generated by the adjustment in the water adjusting unit,
Whether tapping is possible at the first predetermined temperature is determined by detecting the temperature of the heating medium, in response to it has become rather unable is tapping by the first predetermined temperature, lower than the first set temperature second The amount of water supplied to the heat exchanger adjusted by the water amount adjusting means is reduced from that at the time of hot water discharge at the first set temperature, and the water supplied to the heat exchanger is reduced. After exchanging heat with the heat medium, it is mixed with the water supply that has flowed through the bypass path to generate the hot water, and when the generated hot water is lower than the first set temperature, the auxiliary heating unit is used. A control unit that heats hot water and
A hot water supply device characterized by being equipped with. The auxiliary heating unit includes a water heater separate from or integral with claim 6, wherein if the water heater the hot water temperature is lower than the first set temperature, the water supply or the hot water from the hot water supply device A hot water supply device characterized in that hot water is discharged by heating to the first set temperature or another temperature.

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