JP4249766B2 - Heat source machine - Google Patents

Description

  The present invention relates to a heat source machine having a heating function, a hot water supply function, and a bath replenishment function.

  Conventionally, as this type of heat source machine, heating means for heating the heat medium, a heating circuit for circulating the heat medium between the heating means and the heating terminal, a hot water supply circuit for supplying hot water to the hot water supply terminal, and water in the bathtub are circulated A reheating circuit that heats the water flowing in the hot water supply circuit with a heat medium, and a second liquid heat exchanger that heats the water flowing in the reheating circuit with a heat medium. It is known (see, for example, Patent Document 1). And this thing is provided with the 1st and 2nd pair of heat exchange channel connected to a heating circuit in parallel to a heating terminal, and the 1st liquid heat exchanger is interposed in the 1st heat exchange channel. The second liquid heat exchanger is interposed in the second heat exchange channel.

  Thus, if the separate heat exchange flow paths for the first and second liquid-to-liquid heat exchangers are provided, the piping structure becomes complicated and the cost increases. Therefore, it is conceivable that a single heat exchange channel is connected to the heating circuit, and both the first and second liquid heat exchangers are interposed in the heat exchange channel.

  However, in this case, during the simultaneous operation of hot water supply and reheating, the heat of the heat medium is deprived by one of the first and second liquid heat exchangers located on the upstream side. Insufficient heating of the water flowing to the other liquid-to-liquid heat exchanger located on the downstream side occurs. This point will be described in detail with reference to FIG.

  FIG. 4 (a) shows a case where the first liquid-to-liquid heat exchanger 7 is disposed in the heat exchange channel 6 on the downstream side and the second liquid-to-liquid heat exchanger 8 is disposed on the upstream side, and FIG. b) shows a case where the first liquid-liquid heat exchanger 7 and the second liquid-liquid heat exchanger 8 are arranged in the heat exchange flow path 6 on the upstream side and the downstream side, respectively. Here, the maximum heating capacity of the heat medium by the heating means is 400 kcal / min, the heat exchange capacity of the first liquid-to-heat exchanger 7 is equal to the maximum heating capacity of the heating means, and the heat of the second liquid-to-heat exchanger 8 is The exchange capacity is 40% of the maximum heating capacity by the heating means. During simultaneous operation of hot water supply and reheating, a heat medium at 70 ° C. flows into the heat exchange flow path 6 at a flow rate of 8 liters / minute, and water at 20 ° C. enters the first liquid heat exchanger 7 at 10 liters / minute. It is assumed that 20 ° C. water flows into the second liquid-heat exchanger 8 at a flow rate of 8 liters / minute.

  As shown in FIG. 4A, when the second liquid-to-liquid heat exchanger 8 is located on the upstream side, the water flowing into the second liquid-to-liquid heat exchanger 8 is 40% of the maximum heating capacity (= 160 kcal / min). Absorbs heat. Then, the water temperature rises by 20 deg obtained by dividing the heat quantity by the water quantity of 8 liters / minute, and the temperature of the heat medium falls by 20 deg obtained by dividing the heat quantity by the flow rate of the heat medium of 8 liters / minute. Therefore, the temperature of the water flowing out from the second liquid heat exchanger 8 is 40 ° C., and the temperature of the heat medium flowing into the first liquid heat exchanger 7 on the downstream side of the second liquid heat exchanger 8 is 50 ° C. become. In addition, the temperature of the heat medium decreases to 20 ° C., which is equal to the temperature of the water in the hot water supply circuit flowing into the liquid heat exchanger 7 while passing through the first liquid heat exchanger 7. And the water which flows into the 1st liquid heat exchanger 7 absorbs the heat quantity of 240 kcal / min which multiplied the temperature fall amount 30deg of the heat medium in the 1st liquid heat exchanger 7 by the flow rate of 8 liters / min of the heat medium. . Accordingly, the temperature of the water flowing to the first liquid-to-heat heat exchanger 7 rises only by 24 deg obtained by dividing the amount of heat by the amount of water 10 liters / minute, and the temperature of the water flowing out from the first liquid-to-heat heat exchanger 7 is 44. It becomes ℃. With this, the hot water supply capability becomes insufficient, which is inconvenient for the user.

  When the first liquid-to-liquid heat exchanger 7 is located upstream as shown in FIG. 4 (b), the liquid-to-liquid heat exchanger 7 while the temperature of the heat medium passes through the first liquid-to-liquid heat exchanger 7. The temperature drops to 20 ° C., which is equal to the temperature of the water in the hot water supply circuit that flows in And the water which flows into the 1st liquid heat exchanger 7 absorbs the heat quantity of 400 kcal / min which multiplied the temperature fall amount 50deg of the heat medium in the 1st liquid heat exchanger 7 by the flow rate of 8 liters / min of the heat medium. . Therefore, the temperature of the water flowing to the first liquid heat exchanger 7 is increased by 40 deg obtained by dividing the amount of heat by the amount of water 10 liters / minute, and the water temperature flowing out from the first liquid heat exchanger 7 becomes 60 ° C. Sufficient hot water supply capacity can be obtained. However, since the temperature of the heat medium on the downstream side of the first liquid-to-liquid heat exchanger 7 is lowered to 20 ° C., which is equal to the temperature of the water in the reheating circuit flowing into the second liquid-to-liquid heat exchanger 8, the second Heating of the water in the liquid heat exchanger 8, that is, reheating of the bath cannot be performed at all.

4 (a) and 4 (b), the heat medium lowered to 20 ° C. has a maximum heating capacity of 400 kcal / min due to heating at the maximum heating capacity in the heating means, and the flow rate of the heating medium is 8 liter / min. As a result, the temperature rises by 50 deg.
JP 2006-112785 A

  In view of the above points, the present invention has a hot water supply capability during simultaneous operation of hot water supply and reheating even though both the first and second liquid-to-liquid heat exchangers are provided in a single heat exchange channel. It is an object of the present invention to provide a heat source device that can suppress the decrease in the tracking ability to such a level that there is no practical problem.

In order to solve the above problems, the present invention provides a heating means for heating a heat medium, a heating circuit for circulating the heat medium between the heating means and the heating terminal, a hot water supply circuit for supplying hot water to the hot water supply terminal, and a bathtub A reheating circuit for circulating water, a first liquid-to-heat exchanger that heats water flowing in the hot water supply circuit with a heat medium, and a second liquid-to-heat heat exchanger that heats water flowing in the reheating circuit with a heat medium A heat source device comprising a single heat exchange channel connected to the heating circuit in parallel to the heating terminal, and the first and second liquid heat exchangers interposed in the heat exchange channel The second liquid heat exchanger is divided into an inflow side heat exchange part into which water from the bathtub flows in and an outflow side heat exchange part from which water flows out toward the bathtub. In addition, an inflow side heat exchanging portion of the second liquid-liquid heat exchanger is interposed on the downstream side of the first liquid-liquid heat exchanger, With the outflow side heat exchange portion of the second liquid-liquid heat exchanger is located upstream of one liquid-liquid heat exchanger is interposed, a flat box shape which is formed in the cell is a single that has been stacked A liquid heat exchange unit is provided, and among these cells, every other cell in the stacking direction is a heat medium cell intervening in series in the heat exchange flow path, and among the cells other than the heat medium cell in the stacking direction intermediate A plurality of cells located in a portion are used as a first liquid-heat exchanger cell intervened in series with the hot water supply circuit, and cells located on both sides in the stacking direction among cells other than the heat medium cell are connected in series with the additional circuit. The first liquid-liquid heat exchanger cell intervening in the first liquid-liquid heat exchanger cell and the heat medium cell in contact with the first liquid-liquid heat exchanger cell, the downstream of the heat medium flow direction And the second liquid heat exchanger cell in contact with the heat medium cell located in An inflow side heat exchanging section of the liquid heat exchanger is configured, and the second liquid heat exchanger includes a heat medium cell located upstream in the flow direction of the heat medium and a second liquid heat exchanger cell in contact with the heat medium cell. The outflow side heat exchanging section is configured to be in contact with the second liquid heat exchanger cell that is in contact with the heat medium cell located on the downstream side in the flow direction of the heat medium and the heat medium cell that is located on the upstream side in the flow direction of the heat medium. The second liquid-to-liquid heat exchanger cell is connected in series via a communication path that penetrates through other cells located between the second liquid-to-liquid heat exchanger cells .

  Here, the reheating of the bath heats up to the set bath temperature over time while circulating the water in the bathtub. Therefore, the heat exchange capacity of the second liquid heat exchanger for reheating is the same as that for hot water supply. Smaller than the heat exchange capacity of the one-component heat exchanger. Furthermore, in the present invention, since only the outflow side heat exchange section of the second liquid-liquid heat exchanger is installed on the upstream side of the first liquid-liquid heat exchanger, the first liquid-liquid heat exchanger is also operated during simultaneous operation of hot water supply and reheating. A relatively high-temperature heat medium is supplied to the one-liquid heat exchanger, and a decrease in hot water supply capacity is suppressed as much as possible. Furthermore, since a high-temperature heat medium is supplied to the outflow side heat exchanging part of the second liquid-heat heat exchanger, a decrease in the tracking ability is suppressed as much as possible. Therefore, according to the present invention, the hot water supply capacity and the additional capacity during the simultaneous operation of hot water supply and replenishment are provided, although both the first and second liquid heat exchangers are interposed in a single heat exchange flow path. It is possible to suppress the decrease in the burning ability to such an extent that there is no practical problem.

The configuration by the present invention lever, a first liquid-liquid heat exchanger and a second liquid-liquid heat exchanger consisting of the inflow-side heat exchanger and the outflow-side heat exchanger in a single liquid-liquid heat exchange unit Thus, both the first and second liquid-to-liquid heat exchangers can be made compact and the cost can be reduced.

  Hereinafter, the heat source machine according to the embodiment of the present invention shown in FIG. 1 will be described. This heat source device includes a heating means 1 for heating a heat medium (water, antifreeze liquid, etc.). The heating means 1 includes a heat exchanger 1a for flowing a heat medium and a burner 1b as a heat source for the heat exchanger 1a. The heat medium is circulated between the heating means 1 and the heating terminal 2 via the heating circuit 3.

  The heating circuit 3 includes a forward flow path 3a that sends the heat medium heated by the heating means 1 to the heating terminal 2, and a return flow path 3b that returns the heat medium that has passed through the heating terminal 2 to the heating means 1. ing. An expansion tank 31 and a pump 32 on the downstream side of the expansion tank 31 are interposed in the return side flow path 3b, and the heat medium is circulated to the heating circuit 3 by the operation of the pump 32. The heating terminal 2 includes a high-temperature terminal 21 that should flow a high-temperature heat medium and a low-temperature terminal 22 that should flow a comparatively low-temperature heat medium. The forward flow path 3a is branched into a flow path leading to the high temperature terminal 21 and a flow path leading to the low temperature terminal 22, and is branched from the return flow path 3b downstream of the pump 32 to the flow path reaching the low temperature terminal. The bypass flow path 3c is merged. In order to adjust the temperature of the heat medium supplied to the low temperature terminal 22, a flow rate adjusting valve 33 is interposed in the bypass channel 3 c. The high temperature terminal 21 and the low temperature terminal 22 are supplied with a heat medium by opening the on-off valves 21a and 22a in series.

  A hot water supply circuit 4 for supplying hot water to a hot water supply terminal 41 such as a hot water tap and a reheating circuit 5 for circulating the water in the bathtub 51 by the operation of the pump 52 are provided. Furthermore, a single heat exchange channel 6 connected to the heating circuit 3 in parallel with the heating terminal 2 is provided. And in this heat exchange flow path 6, the on-off valve 61, the 1st liquid heat exchanger 7 which heats the water which flows into the hot water supply circuit 4 with a heat medium, and the water which flows into the reheating circuit 5 are heated with a heat medium. The second liquid heat exchanger 8 is interposed. Thus, the tap water supplied from the upstream portion 4 a of the hot water supply circuit 4 is heated by the first liquid heat exchanger 7, and the heated water is supplied to the hot water supply terminal 41 via the downstream portion 4 b of the hot water supply circuit 4. . In addition, the water in the bathtub 51 sent from the upstream portion 5 a of the tracking circuit 5 is heated by the second liquid heat exchanger 8, and the heated water passes through the downstream portion 5 b of the tracking circuit 5. To reflux.

  Here, the second liquid heat exchanger 8 is connected to the upstream portion 5 a of the tracking circuit 5, and the inflow side heat exchange portion 81 into which water from the bathtub 51 flows and the downstream portion 5 b of the tracking circuit 5. And an outflow side heat exchanging portion 82 from which water flows out toward the bathtub 51. And in the heat exchange flow path 6, it is located in the downstream of the 1st liquid heat exchanger 7, the inflow side heat exchange part 81 of the 2nd liquid heat exchanger 8 is interposed, and the 1st liquid heat exchange The outflow side heat exchange part 82 of the 2nd liquid heat exchanger 8 is interposed in the upstream of the vessel 7. Thus, the heat medium heated by the heating means 1 is opened from the upstream portion 6a of the heat exchange flow path 6 to the outflow side heat exchanger 82 and the first liquid by the opening of the on-off valve 61. The heat flows through the heat exchanger 7 and the inflow side heat exchanging portion 81 of the second liquid heat exchanger 8 to the downstream portion 6 b of the heat exchange flow path 6.

  Next, with reference to FIG. 2, the heating state of the water in both the first and second liquid heat exchangers 7 and 8 during simultaneous operation of hot water supply and bath renewal will be described. The maximum heating capacity of the heating means 1 is 400 kcal / min, the heat exchange capacity of the first liquid-to-heat exchanger 7 is equal to the maximum heating capacity of the heating means 1, and the inflow side of the second liquid-to-liquid heat exchanger 8 is The heat exchange capacities of the heat exchange sections 81 and 82 on the outflow side are 20% of the maximum heating capacity of the heating means 1 respectively. During simultaneous operation of hot water supply and reheating, a heat medium at 70 ° C. flows into the heat exchange flow path 6 at a flow rate of 8 liters / minute, and water at 20 ° C. enters the first liquid heat exchanger 7 at 10 liters / minute. It is assumed that 20 ° C. water flows into the inflow side heat exchange section 81 of the second liquid-heat exchanger 8 at a flow rate of 8 liter / min.

  The water flowing to the outflow side heat exchanger 82 of the second liquid heat exchanger 8 absorbs 20% (= 80 kcal / min) of the maximum heating capacity, and the heat quantity is divided by 8 liters / min. The temperature of the heat medium rises only by 10 deg, which is obtained by dividing the amount of heat by the flow rate of the heat medium of 8 liters / minute. Accordingly, the temperature of the heat medium flowing into the first liquid heat exchanger 7 on the downstream side of the outflow side heat exchanging portion 82 is 60 ° C. Thereafter, the temperature of the heat medium decreases to 20 ° C., which is equal to the temperature of the water in the hot water supply circuit 4 flowing into the liquid-liquid heat exchanger 7 while passing through the first liquid-liquid heat exchanger 7. And the water which flows into the 1st liquid heat exchanger 7 absorbs the heat amount of 320 kcal / min which multiplied the temperature fall amount 40deg of the heat medium in the 1st liquid heat exchanger 7 by the flow rate of 8 liters / min of the heat medium. . Accordingly, the temperature of the water flowing into the first liquid-to-heat exchanger 7 is increased by 32 degrees obtained by dividing the amount of heat by the amount of water 10 liters / minute, and the temperature of the water flowing out from the first liquid-to-heat exchanger 7 is 52 ° C. Become.

  Incidentally, in the hot water supply single operation, the temperature of the heat medium is reduced by 50 deg from 70 ° C. to 20 ° C. when passing through the first liquid heat exchanger 7, and the flow rate of the heat medium is set to 8 liter / min. The amount of heat multiplied by 400 kcal / min is absorbed by water flowing into the first liquid-to-heat exchanger 7. Then, the water temperature rises by 40 deg obtained by dividing the heat quantity by the water quantity of 10 liters / minute, and the temperature of the water flowing out from the first liquid heat exchanger 7 becomes 60 ° C. Accordingly, the hot water supply capacity is slightly reduced during hot water supply and chasing simultaneous operation as compared with the single hot water supply operation. However, in the case shown in FIG. 4 (a) in which the entire second liquid-liquid heat exchanger 8 is installed on the upstream side of the first liquid-liquid heat exchanger 7, the first liquid-liquid heat exchange is performed during the simultaneous operation of hot water supply and reheating. In contrast to the temperature of water flowing out of the vessel 7 being 44 ° C., in this embodiment, the temperature of water flowing out of the first liquid heat exchanger 7 during simultaneous operation of hot water supply and reheating is as high as 52 ° C. Thus, it can be seen that the decrease in the hot water supply capability can be suppressed to a practically satisfactory level.

  The temperature of the heat medium on the downstream side of the first liquid-to-liquid heat exchanger 7 is 20 ° C., which is equal to the temperature of the water in the reheating circuit 5 flowing into the inflow-side heat exchanging portion 81 of the second liquid-to-liquid heat exchanger 8. Since it falls, water is not heated in the inflow side heat exchange part 81. Therefore, the temperature of the water flowing into the outflow side heat exchange unit 82 of the second liquid heat exchanger 8 is 20 ° C., and the outflow side heat exchange unit 82 is increased by the above-described 10 deg water temperature increase in the outflow side heat exchange unit 82. The temperature of the water flowing out from the tank becomes 30 ° C. In the case shown in FIG. 4B in which the entire second liquid-liquid heat exchanger 8 is installed on the downstream side of the first liquid-liquid heat exchanger 7, no reheating is performed at the time of simultaneous operation of hot water supply and reheating. In contrast to this, in the present embodiment, the chasing is performed to the minimum necessary even during simultaneous operation.

  As described above, in the present embodiment, although the first and second liquid-liquid heat exchangers 7 and 8 are provided in the single heat exchange flow path 6, the hot water supply and the reheating are performed simultaneously. The decrease in hot water supply capability and chasing capability can be suppressed to such a level that there is no practical problem.

  Next, with reference to FIG. 3, the concrete structure of both the 1st and 2nd liquid heat exchangers 7 and 8 is demonstrated. Both the liquid-to-liquid heat exchangers 7 and 8 are composed of a single liquid-to-liquid heat exchange unit 9 in which a plurality of (for example, nine) cells formed in a flat box shape are stacked. Among these cells, the second, fourth, sixth and eighth cells from the bottom are heat medium cells 91 intervening in series with the heat exchange flow path 6. Then, the heat medium flows through the heat medium cells 91 from the top to the bottom. That is, these heat medium cells 91 are connected in series via a communication path 91a that passes through the cells positioned between them, and the heat exchange channel is connected to the uppermost heat medium cell 91 (the eighth cell from the bottom). 6, the downstream portion 6b of the heat exchange channel 6 is connected to the lowest heat medium cell 91 (second cell from the bottom).

  Further, among the cells other than the heat medium cell 91, a plurality of cells in the middle part in the stacking direction, that is, the third, fifth and seventh cells from the bottom are the first liquid heat intervened in the hot water supply circuit 4 in series. It is an exchanger cell 92. Then, the water in the hot water supply circuit 4 flows in order from the lower one to the upper one in the first liquid-liquid heat exchanger cell 92. That is, the first liquid-to-liquid heat exchanger cells 92 are connected in series via a communication path 92a that passes through the cells positioned therebetween, and the lowest first liquid-to-liquid heat exchanger cell 92 (from the bottom) The upstream portion 4a of the hot water supply circuit 4 is connected to the third cell), and the downstream portion 4b of the hot water supply circuit 4 is connected to the uppermost first liquid-liquid heat exchanger cell 92 (seventh from the bottom).

  Further, among the cells other than the heat medium cell 91, the cells on both sides in the stacking direction, that is, the first and ninth cells from the bottom are the second liquid-liquid heat exchanger cells 93 intervened in series in the reheating circuit 5. It has become. And the water of the chasing circuit 5 is made to flow into these 2nd liquid-liquid heat exchanger cells 93 in order from the lower one to the upper one. That is, these second liquid-to-liquid heat exchanger cells 93 are connected in series via a communication passage 93a passing through the cells positioned between them, and the lowest second liquid-to-liquid heat exchanger cell 93 (from the bottom) The upstream portion 5a of the chasing circuit 5 is connected to the first cell), and the downstream portion 5b of the chasing circuit 5 is connected to the uppermost second liquid-liquid heat exchanger cell 93 (the ninth from the bottom). .

  Thus, the first liquid-to-liquid heat exchanger cell 92 and the heat medium cell 91 in contact therewith, that is, the second to eighth cells 91 and 92 from the bottom constitute the first liquid-to-liquid heat exchanger 7, and the heat medium The second liquid-liquid heat exchanger is composed of a heat medium cell 91 (second cell from the bottom) located on the downstream side in the flow direction and a second liquid-to-liquid heat exchanger cell 93 (first cell from the bottom) in contact therewith. 8 inflow side heat exchange section 81 is configured, and heat medium cell 91 (eighth cell from the bottom) located upstream in the flow direction of the heat medium and second liquid-to-liquid heat exchanger cell 93 (from the bottom) The ninth cell) constitutes the outflow side heat exchanging portion 82 of the second liquid heat exchanger 8. Note that the second and eighth cells from the bottom are the heat medium cells 91 that are also used as the heat exchange units 81 and 82 and the first liquid heat exchanger 7 on the inflow side and the outflow side.

  According to this, the 1st liquid-liquid heat exchanger 7 and the 2nd liquid-liquid heat exchanger 8 which consists of the inflow side heat exchange part 81 and the outflow side heat exchange part 82 are made into the single liquid-liquid heat exchange unit 9. It can comprise, and both the liquid heat exchangers 7 and 8 can be made compact and cost-reduced.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the above embodiment, the number of cells constituting the liquid-liquid heat exchange unit 9 is nine, and the two cells, the first from the bottom and the first from the top, are connected to the second liquid-to-liquid heat exchanger cell 93. However, the number of cells may be increased, and a total of four cells, the first and third from the bottom and the first and third from the top, may be used as the second liquid-liquid heat exchanger cell. Moreover, in the said embodiment, although the heating means 1 was comprised in what heated a heat medium with the combustion heat of the burner 1b, you may comprise in what heats a heat medium with electric heating. Further, the inflow side and outflow side heat exchange sections 81 and 82 of the first liquid-to-liquid heat exchanger 7 and the second liquid-to-liquid heat exchanger 8 can be configured by independent liquid-to-liquid heat exchangers. is there.

The figure which shows the heat-source equipment of embodiment of this invention. Explanatory drawing which shows the heating state of the water in the 1st liquid-liquid heat exchanger at the time of simultaneous operation | movement of the hot water supply and reheating in the heat-source equipment of embodiment. The typical sectional view showing the liquid heat exchange unit with which the heat source machine of an embodiment is equipped. Explanatory drawing which shows the heating state of the water in the 1st liquid heat exchanger and the 2nd liquid heat exchanger at the time of the simultaneous operation of the hot water supply and the reheating in the comparative example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Heating means, 2 ... Heating terminal, 3 ... Heating circuit, 4 ... Hot water supply circuit, 41 ... Hot water supply terminal, 5 ... Reheating circuit, 51 ... Bath, 6 ... Heat exchange flow path, 7 ... 1st liquid heat exchange 8 ... second liquid heat exchanger, 81 ... inflow side heat exchange section, 82 ... outflow side heat exchange section, 9 ... liquid heat exchange unit, 91 ... heat medium cell, 92 ... first liquid heat exchange Cell for equipment, 93 ... cell for second liquid-to-heat exchanger.

Claims (1)

Heating means for heating the heat medium, a heating circuit for circulating the heat medium between the heating means and the heating terminal, a hot water supply circuit for supplying hot water to the hot water supply terminal, a reheating circuit for circulating water in the bathtub, and a hot water supply circuit A heat source apparatus comprising a first liquid-to-heat heat exchanger that heats flowing water using a heat medium and a second liquid-to-heat heat exchanger that heats water flowing to the reheating circuit using a heat medium, and is parallel to the heating terminal In which a single heat exchange channel connected to the heating circuit is provided, and both the first and second liquid-to-liquid heat exchangers are interposed in the heat exchange channel,
The second liquid heat exchanger is divided into an inflow side heat exchange part into which water from the bathtub flows in and an outflow side heat exchange part from which water flows out toward the bathtub, and the first liquid is provided in the heat exchange channel. An inflow side heat exchanging portion of the second liquid heat exchanger is interposed on the downstream side of the heat exchanger, and the second liquid heat exchanger is positioned on the upstream side of the first liquid heat exchanger. with the outflow side heat exchange portion of the is interposed,
A single liquid-fluid heat exchange unit is provided in which a plurality of cells formed in a flat box shape are stacked, and a plurality of cells in the stacking direction are intervened in series in the heat exchange flow path. Among the cells other than the heat medium cell, a plurality of cells located in the intermediate portion in the stacking direction are used as the first liquid-liquid heat exchanger cell intervening in series with the hot water supply circuit, and the cells other than the heat medium cell The cells located on both sides in the stacking direction are the second liquid-to-liquid heat exchanger cells intervened in series with the tracking circuit, and the first liquid-to-liquid heat exchanger cell and the heat medium cell in contact with the first liquid-to-liquid heat exchanger cell A one-liquid heat exchanger is configured, and the heat medium cell located downstream in the flow direction of the heat medium and the second liquid-liquid heat exchanger cell in contact with the heat medium cell are inflow side heat exchange of the second liquid-liquid heat exchanger. The heating medium cell is located on the upstream side of the heat medium flow direction. The second liquid-liquid heat exchanger cell in contact with the second liquid-liquid heat exchanger constitutes the outflow side heat exchange section of the second liquid-liquid heat exchanger, and the second liquid-liquid heat is in contact with the heat medium cell located downstream in the flow direction of the heat medium. The exchanger cell and the second liquid-liquid heat exchanger cell in contact with the heat medium cell located on the upstream side in the flow direction of the heat medium pass through other cells positioned between the second liquid-liquid heat exchanger cells. A heat source device connected in series via a communicating path .

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