JP6396833B2 - Heat source system - Google Patents

Description

  The present invention combines a heating heat medium (hot water, etc.) supplied to floor heating, a bathroom dryer, etc., a heat source device for heating hot water supplied to a bathtub, faucet, etc., and a cogeneration device equipped with a fuel cell or the like. It relates to a heat source system.

  Recently, cogeneration systems equipped with fuel cells and the like are becoming popular. The fuel cell generates heat during power generation and needs to be cooled. Accordingly, liquid water (cooling water) is allowed to flow through the fuel cell to cool the fuel cell, and liquid water (hot water) whose temperature has been raised by cooling the fuel cell is stored in a hot water storage tank, and the liquid water ( A cogeneration system using hot water for hot water supply is known (Patent Document 1).

JP 2007-10177 A

  In the cogeneration system of Patent Document 1, cold water (city water or the like) is stored in a lower part of a hot water storage tank, and the stored liquid water is appropriately taken out and allowed to flow through the fuel cell to cool the fuel cell. And the liquid water (hot water) which temperature rose by cooling a fuel cell is stored in the upper part of a hot water storage tank. When hot water stored in the hot water storage tank is used for hot water supply, cold water (city water, etc.) is allowed to flow into the lower part of the hot water storage tank. Then, hot water is pushed out from the upper part of the hot water storage tank and flows out. Thus, the inside of the hot water storage tank is always filled with liquid water (cold water and hot water).

  Refrigerators and the like consume electricity for 24 hours, so there is always a demand for power generation for fuel cells. Therefore, the fuel cell normally continues to operate without stopping. Even at midnight when hot water is not used, it continues to generate heat with power generation. In order to cool this heat, the fuel cell is cooled with liquid water taken out from the lower part of the hot water storage tank, and liquid water (hot water) whose temperature has increased by cooling the fuel cell is stored in the upper part of the hot water storage tank. There is a possibility that the ratio of hot water gradually increases inside the hot water tank, and eventually the hot water tank fills with hot water. In such a state, even if liquid water (hot water) is taken out from the lower part of the hot water storage tank and the liquid water (hot water) flows through the fuel cell, the fuel cell cannot be cooled.

  Therefore, when the temperature of the liquid water taken out from the lower part of the hot water storage tank is high, the radiator fan is operated to lower the temperature of the liquid water.

  However, in such a method, the heat of hot water is discarded unnecessarily, which becomes a factor of deteriorating thermal efficiency.

  The present invention has been made paying attention to such conventional problems. An object of the present invention is to provide a heat source system that exhibits excellent thermal efficiency by effectively utilizing the heat of liquid water (hot water) whose temperature has increased by cooling a heating element such as a fuel cell. That is.

  The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected, it is not limited to this. Further, the configuration described with reference numerals may be appropriately replaced or improved.

  In the first invention, the sensible heat exchanger (12) that heats the heating heat medium with the heat generated by the burner (13) and the sensible heat exchanger (12) pass through and the temperature is lowered. Heating heat exchanger (10) including latent heat exchanger (11) for heating heating heat medium with heat, heat medium circulation pump (51) for pumping heating heat medium, and heating heat medium And a heating heat medium pumped from the heat medium circulation pump (51) through the sensible heat exchanger (12) and the cistern tank (53) in this order. Heating medium circulation pipes (511, 512, 513, 514) for flowing to the heat medium circulation pump (51), and heating between the sensible heat exchanger (12) and the cistern tank (53) Provided in the middle of the heat medium circulation line (512, 513) , An operation valve (52) for controlling the flow rate of the heating heat medium, an operation valve bypass pipe (515) for bypassing the operation valve (52), the heat medium circulation pump (51), and the sensible heat. A heating heat medium circulation line (513) branched from the heating heat medium circulation line (511) between the exchanger (12) and the heating valve (52) and the cistern tank (53). ) Passing through the heat exchange pipe (516, 517), the heating element (210), the liquid water pump (240) for supplying liquid water to the heating element (210), and the heating element (210). A hot water storage tank (220) for storing the heated liquid water, and a tank bypass pipe (207,) for bypassing the liquid water heated by the heating element (210) without flowing into the hot water storage tank (220). 208) and the heating element (210) A three-way valve (250) for switching the flow direction of all or part of the liquid water to the hot water storage tank (220) or the tank bypass pipe (207, 208), and the tank bypass pipe (207, 208) Is a heat source system having a liquid-liquid heat exchanger (54) for exchanging heat between the liquid water flowing through the heat exchanger and the heating heat medium flowing through the heat exchange pipes (516, 517).

  According to a second aspect of the present invention, in the first aspect, the low-temperature heating terminal branching from the heating heat medium circulation pipe (511) between the heat medium circulation pump (51) and the sensible heat exchanger (12). The heating medium is caused to flow to the pipe line (526, 621, 622), the low temperature heating terminal (62) provided in the low temperature heating terminal pipe line (526, 621, 622), and the low temperature heating terminal (62). It is a heat source system which has the low temperature terminal valve (561) which opens in the case.

  According to a third aspect of the present invention, in the first or second aspect, the high-temperature heating is branched from the heating heat medium circulation pipe (512) between the sensible heat exchanger (12) and the operation valve (52). The terminal pipe (520, 523, 612, 613), the high-temperature heating terminal (61) provided in the high-temperature heating terminal pipe (520, 523, 612, 613), and the heating to the high-temperature heating terminal (61) It is a heat-source system which has a high temperature terminal valve (611) opened when supplying the heat medium for operation.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the heating heat medium circulation pipe (512) between the sensible heat exchanger (12) and the operation valve (52) is provided. A reheating heat exchange line (520, 521, 522) that branches off, a recirculation circulation line (78, 791, 792) through which bath water circulates, and the reheating heat exchange line (520, 521, 522). A reheating heat exchanger (55) for exchanging heat between the heating heat medium flowing through the recirculation pipe (78, 791, 792) and the hot water flowing through the recirculation circulation line (78, 791, 792), and the reheating heat exchanger (55). It is a heat source system having a flow rate control valve (551) that is opened when a heating heat medium flows.

  In a fifth aspect of the present invention, in any one of the first to fourth aspects, when the use start time of the low temperature heating terminal (62) is reserved and the preheating time comes, the low temperature heating terminal ( 62) Prior to commencing use of the heating heat exchanger (10) without igniting the heating valve (52), the high temperature terminal valve (611) and the low temperature terminal valve (561) Is a heat source system having a preheat control unit (S100) for operating the heat medium circulation pump (51) with the three-way valve (250) on the tank bypass line side in the closed state.

  According to a sixth invention, in any one of the first to fifth inventions, at least when the low temperature heating terminal (62) or the high temperature heating terminal (61) is used, the burner (13) is burned. Operating the heat medium circulation pump (51) and controlling opening and closing of the low temperature terminal valve (561), the high temperature terminal valve (611) and the operation valve (52) according to the heating terminal to be used, If the temperature of the heating heat medium flowing downstream from the junction of the low temperature heating terminal pipe (526, 621, 622) and the high temperature heating terminal pipe (520, 523, 612, 613) is lower than the reference temperature A heat source having a heating heat exchanger operation control unit (S200) in which the three-way valve (250) is on the tank bypass line side and, if higher, the three-way valve (250) is on the hot water storage tank (220) side. It is a stem.

  In a seventh aspect based on the sixth aspect, the heating heat exchanger operation control unit (S200) opens the low temperature terminal valve (561) when the low temperature heating terminal (62) is used. When the operating valve (52) is opened and the low temperature heating terminal (62) is not used, the heat source system closes the low temperature terminal valve (561).

  In an eighth aspect based on the sixth or seventh aspect, the heating heat exchanger operation control unit (S200) is configured to switch the high temperature terminal valve (611) when the high temperature heating terminal (61) is used. In the heat source system, when the valve (52) is closed and the high temperature heating terminal (61) is not used, the high temperature terminal valve (611) is closed.

  In a ninth aspect based on any one of the sixth to eighth aspects, the heating heat exchanger operation control unit (S200) opens the flow rate control valve (551) when reheating. When the operating valve (52) is in a closed state and does not catch up, the heat source system closes the flow control valve (551).

  According to this aspect, since the liquid-liquid heat exchanger performs heat exchange between the liquid water (cooling water) flowing through the heating element and the heating medium, the cooling water is cooled while cooling the liquid water (cooling water). As a result, the heating heat medium is heated. Therefore, heat can be used effectively and thermal efficiency is improved.

FIG. 1 is an overall system diagram showing an embodiment of a heat source system according to the present invention. FIG. 2 is a diagram showing the correlation between the amount of heat contained in water (water vapor) and the temperature. FIG. 3 is a diagram illustrating basic control for realizing a bath reheating function and a heating function. FIG. 4 is a diagram illustrating an example of relationship data (PQ data) between the water level (P) of the bathtub and the amount of water (Q). FIG. 5 is a flowchart of the preheat control executed by the controller. FIG. 6 is a diagram for explaining the flow of the cooling water and the heating heat medium when the preheat control of FIG. 5 is executed and the preheat start time comes. FIG. 7 is a flowchart of heating heat exchanger operation control executed by the controller. FIG. 8 is a flowchart of a valve opening / closing process executed by the controller. FIG. 9 is a diagram for explaining the flow of the heating heat medium when only the low-temperature heating terminal is used and the detected temperature of the thermistor 5241 does not exceed 40 ° C. FIG. 10 is a diagram for explaining the flow of the heating heat medium when only the low-temperature heating terminal is used and the detected temperature of the thermistor 5241 exceeds 40 ° C. FIG. 11 is a diagram for explaining the flow of the heating heat medium when only the high-temperature heating terminal is used and the temperature detected by the thermistor 5241 does not exceed 40 ° C. FIG. 12 is a diagram for explaining the flow of the heating medium when the reheating is performed while using the low-temperature heating terminal but the high-temperature heating terminal is not used and the detected temperature of the thermistor 5241 does not exceed 40 ° C. It is.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is an overall system diagram showing an embodiment of a heat source system according to the present invention.

  The heat source system 1 is a combination of a heating heat medium (hot water, etc.) supplied to floor heating or bathroom dryer, a heat source device for heating hot water supplied to a bathtub, faucet, etc., and a cogeneration device equipped with a fuel cell etc. System.

  The fuel cell generates heat during power generation and needs to be cooled. The heat source system 1 heats the heating heat medium while cooling the fuel cell by performing heat exchange between the liquid water for cooling the fuel cell and the heating heat medium, thereby improving the thermal efficiency of the entire system. .

  In order to facilitate understanding of the embodiment, a heat source device will be described first.

  The heat source device has a hot water supply function, a bath reheating function, and a heating function. The hot water supply function is mainly realized by the hot water supply heat exchanger 20, and the bath reheating function and the heating function are mainly realized by the heating heat exchanger 10.

  The hot water supply heat exchanger 20 includes a latent heat exchanger 21 and a sensible heat exchanger 22. The water supplied from the outside through the water supply introduction pipe 71 is first heated by the latent heat exchanger 21 of the hot water supply heat exchanger 20, and then heated by the sensible heat exchanger 22, and the hot water supply pipe 72. It is led to an appropriate hot water supply destination. The heat used by the latent heat exchanger 21 and the sensible heat exchanger 22 is generated by the burner 23.

  The configuration related to the hot water supply heat exchanger 20 will be further described. The water supply introduction pipe 71 is connected to the cistern tank 53 via a connection pipe 74 and a makeup water electromagnetic valve 741. The tank capacity of the cistern tank 53 is, for example, about 1 to 1.8 liters. The cistern tank 53 is open to the atmosphere via an air introduction pipe 531. A flow rate sensor 711 and an incoming water temperature sensor 712 are provided on the inlet side of the water supply introduction pipe 71. The flow rate sensor 711 is a flow rate detection unit that detects the amount of hot water flowing through the water supply introduction pipe 71. The incoming water temperature sensor 712 is temperature detecting means for detecting the incoming water temperature of the hot water flowing through the water supply introduction pipe 71. A branch pipe 73 branches from the water supply introduction pipe 71. A hot and cold water path switching valve 731 is provided at a branch point of the branch pipe 73. The branch pipe 73 joins the hot water supply pipe 72 connected to the outlet side of the sensible heat exchanger 22. The tip of the hot water supply pipe 72 is led to an appropriate hot water supply destination.

  The hot water supply pipe 72 is provided with a tapping hot water temperature detection sensor 721 on the upstream side of the junction of the branch pipe 73 and a tapping hot water temperature detection sensor 722 on the downstream side. Further, the hot water supply pipe 72 on the downstream side of the junction of the branch pipe 73 and the hot water temperature detection sensor 722 is connected to the pouring water unit 750 via the pipe 75. One end of a hot water introduction pipe 76 for bath is connected to the hot water supply unit 750, and the other end of the hot water introduction pipe 76 for bath is connected to a bathtub hot water circulation pump 77. The hot water unit 750 is provided with a hot water solenoid valve 751, a hot water sensor 752, and check valves 753 and 754. Further, a pipe 78 is connected to the discharge port of the bathtub hot water circulation pump 77, and this pipe 78 is connected to the inlet of the reheating heat exchanger 55. A pipe line 791 is connected to the outlet of the reheating heat exchanger 55, and this pipe line 791 is connected to the circulation fitting 790 of the bathtub 79. In addition, a pipe 792 is connected to the circulation fitting 790 of the bathtub 79, and this pipe 792 is connected to the suction port of the bathtub hot water circulation pump 77.

  The pipe 78 is provided with a bath temperature sensor 781, a water level sensor 782, and a bath water flow switch 783. The bath temperature sensor 781 is a bath water temperature detecting means for detecting the temperature of the bath water. The water level sensor 782 is a water level detection means for detecting the water level of the bathtub hot water. The bath water flow switch 783 is water flow detection means for detecting the water flow of the bathtub hot water circulating as described above.

  With this configuration, the hot water that has flowed from the hot water supply heat exchanger 20 to the hot water supply pipe 72 is the hot water supply pipe 72 → the pipe 75 → the pouring water unit 750 → the bath pouring introduction pipe 76 → the bathtub. After passing through the hot water circulation pump 77 in order, the bathtub hot water circulation pump 77 → the pipeline 78 → the reheating heat exchanger 55 → the pipeline 791 and the bathtub hot water circulation pump 77 → the pipeline 792 are routed to the bathtub 79. It reaches. A hot water filling pipe for performing hot water filling or water pouring is constituted by such a route. Thus, pouring using both the pipe line 791 and the pipe line 792 is a type called double conveyance. According to this type, there is a merit that resistance at the time of pouring is small, and when a water heater having a large pouring flow rate (for example, No. 24 water heater) is used, pouring can be performed quickly. There is also a type called single conveyance using only the pipe line 791. In this type, although a two-way valve is required between the pipe line 792 and the bath pouring introduction pipe line 76 connecting portion, and a cost is required, the water level sensor can be used during pouring by using the water level sensor of the pipe line 792. Can be measured. Although FIG. 1 illustrates the double conveyance type, the present invention can be applied to a single conveyance type.

  Also, the bathtub hot water in the bathtub 79 is sucked by the bathtub hot water circulation pump 77, and the circulation fitting 790 (tub 79) → the pipe 792 → the bathtub hot water circulation pump 77 → the pipe 78 → the reheating heat exchanger 55 → the pipe 791 → circulates the circulating metal fitting 790 (tub 79). The above-described pipeline forms a recirculation circulation pipeline.

  Moreover, in the figure, the code | symbol 41 shows the receiving tray for receiving the condensed water (drain) generated as mentioned later. Reference numerals 42 and 44 denote drain discharge pipes. Reference numeral 43 indicates a neutralizing means for neutralizing the drain.

  The burner 23 generates high-temperature combustion gas by burning fuel (gas). A combustion fan 24 is provided below the burner 23. The combustion fan 24 supplies and exhausts the combustion of the burner 23. The fuel (gas) flows through one gas pipe 32 branched from the gas pipe 30 and is supplied to the burner 23. A gas on / off valve 301 is interposed in the gas pipe 30. In addition, a gas proportional valve 321 and a gas on-off valve 322 are interposed in the gas pipe 32. The gas proportional valve 321 controls the amount of fuel supplied to the burner 23 by the valve opening. The gas on-off valve 322 controls fuel supply / stop to the burner 23.

  The burner 13 is the same as the burner 23. That is, below the burner 13, a combustion fan 14 for supplying and exhausting combustion of the burner 13 is provided. The fuel (gas) flows through the other gas pipe 31 branched from the gas pipe 30 and is supplied to the burner 13. A gas proportional valve 311 and a gas on-off valve 312 are interposed in the gas pipe 31. The gas proportional valve 311 controls the amount of fuel supplied to the burner 13 by the valve opening. The gas on-off valve 312 controls supply / stop of fuel to the burner 13.

  The gas on-off valves 301, 312, and 322 and the gas proportional valves 311 and 321 are all formed by electromagnetic valves. Combustion control of the burners 13 and 23 is controlled by an appropriate control method by the controller 9 shown in FIG.

  The combustion gas produced by the burners 13 and 23 has a temperature of several thousand degrees. The sensible heat exchanger 22 heats liquid water (hot water) using this combustion gas. Further, the latent heat exchanger 21 heats liquid water (hot water) using the combustion gas whose temperature has been reduced by heat exchange when passing through the sensible heat exchanger 22. Since the hot water supply heat exchanger 20 heats liquid water by the sensible heat exchanger 22 and the latent heat exchanger 21 in this way, the heat efficiency is good.

  FIG. 2 is a diagram showing the correlation between the amount of heat contained in water (water vapor) and the temperature.

This will be described in more detail with reference to FIG. When a component (for example, methane CH ₄ ) contained in the fuel gas is burned (oxidized) by the burner 23, a combustion gas containing carbon dioxide CO ₂ and water vapor H ₂ O is generated. This combustion gas has a temperature of several thousand hundred degrees. When this combustion gas passes through the sensible heat exchanger 22, it exchanges heat with water flowing through the sensible heat exchanger 22. As a result, the water flowing through the sensible heat exchanger 22 is heated, and the temperature of the combustion gas is reduced to about 200 ° C. Even if the temperature is lowered to about 200 ° C., a large amount of heat still remains in this combustion gas.

  The amount of heat contained in water (steam) has a known correlation shown in FIG. 2 with the temperature, and the amount of heat changes greatly around 100 ° C. Since the latent heat exchanger 21 collects and uses the latent heat (condensation heat) when the state changes from gas to liquid, very good thermal efficiency can be obtained. When passing through the latent heat exchanger 21, the temperature of the combustion gas is lowered from about 200 ° C. to about 50 ° C., and water vapor is condensed into liquid water. Therefore, a tray 41 for receiving condensed water (drain) is provided below the latent heat exchanger 21.

  The heating heat exchanger 10 includes a latent heat exchanger 11 and a sensible heat exchanger 12 as in the case of the hot water supply heat exchanger 20, and heats liquid water using these. Therefore, the heating heat exchanger 10 has good thermal efficiency, like the hot water supply heat exchanger 20.

  Returning to FIG. 1 again, the flow of the heating heat medium centering on the heating heat exchanger 10 will be described. The heating heat medium sent from the heat medium circulation pump 51 circulates in the heating heat exchanger 10. The circulation channel will be described.

  A pipe 511 is connected to the discharge port of the heat medium circulation pump 51, and this pipe 511 is connected to the inlet of the sensible heat exchanger 12. A pipe line 512 is connected to the outlet of the sensible heat exchanger 12, and this pipe line 512 is connected to the inlet of the low temperature operation valve 52. A pipe line 513 is connected to the outlet of the low temperature operation valve 52, and this pipe line 513 is connected to the inlet of the cistern tank 53. A pipe 514 is connected to the outlet of the cistern tank 53, and this pipe 514 is connected to the suction port of the heat medium circulation pump 51. Further, an operating valve bypass line 515 for bypassing the low temperature operating valve 52 is provided.

  Further, the pipe 511 branches from the pipe 511. This pipe line 516 is connected to the inlet of the liquid-liquid heat exchanger 54. A pipe 517 is connected to the outlet of the liquid-liquid heat exchanger 54, and this pipe 517 joins the pipe 513.

  With such a configuration, it can be said that the sensible heat exchanger 12 and the liquid-liquid heat exchanger 54 are connected in parallel between the heat medium circulation pump 51 and the cistern tank 53.

  When the heat medium circulation pump 51 is driven, the heating heat medium flows from the heat medium circulation pump 51 to the pipe 511, and a part of the heating medium is divided into the pipe 516.

  The heating heat medium that continues to flow through the pipe 511 is the pipe 511 → the sensible heat exchanger 12 → the pipe 512 → the low-temperature operating valve 52 (operating valve bypass pipe 515) → the pipe 513 → the cistern tank 53 → the pipe 514 → the heat medium circulation pump 51 flows. The above-described conduits constitute a heating medium circulation conduit for heating.

  On the other hand, the heating heat medium that is diverted from the pipe 511 and flows through the pipe 516 flows in the order of the pipe 516 → the liquid-liquid heat exchanger 54 → the pipe 517 and joins the pipe 513. A heat exchange pipeline is constituted by the above pipelines.

  And the flow which flows through the heat-medium circulation pipeline for heating and a heat exchange pipeline is a basic circulation flow.

  Next, the structure for implement | achieving the heating function which is one of the functions of the heat exchanger 10 for heating is demonstrated.

  First, the heating function using the high-temperature heating terminal will be described.

  A pipeline 520 branches from a pipeline 512 through which the heating heat medium flows, and this pipeline 520 further branches into a pipeline 521 and a pipeline 523.

  One pipe 523 from which the pipe 520 branches is connected to the entrance of the high-temperature heating terminal 61 through the pipe 612. Here, the high-temperature heating terminal is, for example, a bathroom heater or a bathroom dryer. A high temperature terminal valve 611 is provided near the entrance of the high temperature heating terminal 61. The high temperature terminal valve 611 is opened when a heating heat medium is allowed to flow to the high temperature heating terminal 61. The high temperature terminal valve 611 is, for example, a thermal valve. When the high temperature heating operation switch is turned on, the thermal valve is energized to cause the PTC thermistor to generate heat and operate the thermo actuator. By such processing, the thermal valve opens after a predetermined time (for example, 1 minute) has elapsed. When the high temperature heating operation switch is turned off, energization to the thermal valve is stopped and the thermal valve is closed after a predetermined time (for example, 20 seconds) has elapsed. When the high temperature terminal valve 611 is opened, the high temperature heating terminal 61 is supplied with a heating heat medium having a predetermined high temperature heating set temperature (for example, 80 ° C.), such as a bathroom heater or a bathroom dryer. Heating function is realized. A pipe 613 is connected to the outlet of the high temperature heating terminal 61, and this pipe 613 is connected to the pipe 524 via the heat medium junction 63 and the pipe 631. The pipe 524 is connected to the inlet of the latent heat exchanger 11. A pipe 525 is connected to the outlet of the latent heat exchanger 11, and this pipe 525 joins the pipe 513.

  A heating high temperature thermistor 5122 is provided in the pipe line 512. The heating high temperature thermistor 5122 detects the temperature of the heating heat medium that is output from the sensible heat exchanger 12. Combustion control of the burner 13 is performed based on this detection signal, so that the temperature of the heating heat medium supplied to the high-temperature heating terminal 61 is adjusted.

  With this configuration, if the high temperature terminal valve 611 is open, in addition to the basic circulation flow described above, the pipeline 512 → the pipeline 520 → the pipeline 523 → the pipeline 612 → the high temperature heating terminal 61 A branching flow of the heating heat medium is generated as follows: pipe 613 → heat medium confluencer 63 → pipe 631 → pipe 524 → latent heat exchanger 11 → pipe 525 → pipe 513. Thereby, the high temperature heating terminal 61 is heated and a heating function is realized.

  Next, a heating function using the low temperature heating terminal will be described.

  A pipeline 526 branches from the pipeline 511. The pipe 526 is connected to the heat medium branching device 56. Inside the heat medium branching device 56, a plurality of pipes are branched, and a low temperature terminal valve 561 is built in the outlet of each pipe. A pipe line 621 is connected to these outlets, and this pipe line 621 is connected to the inlet of the low temperature heating terminal 62. Here, the low temperature heating terminal is a hot water mat used for floor heating, for example. The low temperature terminal valve 561 is opened when a heating heat medium flows to the low temperature heating terminal 62. The low temperature terminal valve 561 is, for example, a thermal valve. When the low temperature heating operation switch is turned on, the thermal valve is energized to cause the PTC thermistor to generate heat and operate the thermo actuator. By such processing, the thermal valve opens after a predetermined time (for example, 1 minute) has elapsed. When the low-temperature heating operation switch is turned off, energization to the thermal valve is stopped and the thermal valve is closed after a predetermined time (for example, 20 seconds) has elapsed. A pipe 622 is connected to the outlet of the low-temperature heating terminal 62, and this pipe 622 joins the heat medium junction 63. When the low temperature terminal valve 561 is opened, a heating heat medium having a predetermined low temperature heating set temperature (for example, 60 ° C.) is supplied to the low temperature heating terminal 62 to realize a heating function (floor heating). . Note that a heating low temperature thermistor 5121 is provided in the pipe line 511. The heating low temperature thermistor 5121 detects the temperature of the heating heat medium discharged from the heat medium circulation pump 51. Combustion control of the burner 13 is performed based on this detection signal, whereby the temperature of the heating heat medium supplied to the low-temperature heating terminal 62 is adjusted.

  With this configuration, if the low temperature terminal valve 561 is open, in addition to the basic circulation flow described above, the pipe 511 → the pipe 526 → the heat medium branching device 56 → the low temperature terminal valve 561 → the pipe The branching flow of the heating heat medium such as the path 621 → the low-temperature heating terminal 62 → the pipe 622 → the heat medium combiner 63 → the pipe 631 → the pipe 524 → the latent heat exchanger 11 → the pipe 525 → the pipe 513 Arise. Thereby, the low-temperature heating terminal 62 is heated and a heating function is realized.

  In addition, one of the functions of the heat exchanger 10 for heating is a bath retreat function. This reheating function is realized in the reheating heat exchanger 55 by exchanging heat between the heating heat medium heated by the heating heat exchanger 10 and the bathtub hot water. A configuration for realizing this tracking function will be described.

  First, the heating heat medium circulating in the reheating heat exchanger 55 will be described.

  As described above, the pipe line 520 is branched from the pipe line 512 through which the heating heat medium flows, and the pipe line 520 is further branched into the pipe line 521 and the pipe line 523. , Connected to the inlet of the reheating heat exchanger 55. The heating heat medium 55 heated by the sensible heat exchanger 12 and having a predetermined set temperature (for example, 80 ° C.) flows into the reheating heat exchanger 55. A pipeline 522 is connected to the outlet of the reheating heat exchanger 55, and this pipeline 522 joins the pipeline 524.

  A flow rate control valve 551 is provided at the inlet of the reheating heat exchanger 55. The flow rate of the heating heat medium flowing into the reheating heat exchanger 55 can be adjusted by the opening degree of the flow control valve 551.

  With this configuration, if the flow control valve 551 is open, in addition to the basic circulation flow described above, the pipe 512 → the pipe 520 → the pipe 521 → the reheating heat exchanger 55 → the pipe A branching flow of the heating heat medium is generated in the order of path 522 → pipe 524 → latent heat exchanger 11 → pipe 525 → pipe 513.

  On the other hand, when reheating the bathtub hot water, as described above, the circulation fitting 790 (tub 79) → the pipe 792 → the bathtub hot water circulation pump 77 → the pipe 78 → the reheating heat exchanger 55 → the pipe 791 → the circulation fitting. 790 (tub 79). The bathtub hot water circulates in this way, and is heated by the heating heat medium when passing through the reheating heat exchanger 55 and retreated. In this way, the bathtub hot water is heated and a reheating function is realized.

  During this reheating operation, the burner 13 is burned so that the temperature of the high-temperature heating thermistor 5122 becomes a set temperature (for example, 80 ° C.), and heating is performed until the detected temperature of the bath temperature sensor 781 becomes the set temperature of the bath. Circulate the heating medium and bath water. When the temperature detected by the bath temperature sensor 781 reaches the bath setting temperature, the combustion of the burner 13 is stopped. The heat medium circulation pump 51 and the bathtub hot water circulation pump 77 are stopped after a predetermined post pump time has elapsed.

  Furthermore, when performing hot water filling (automatic hot water filling operation) to the bathtub 79, the water passing through the hot water supply heat exchanger 20 is heated by the combustion of the burner 23, and hot water is poured into the bathtub 79 through the hot water filling pipe line. Then, after the automatic hot water filling, for example, during the heat retention operation time of 4 hours, the detected temperature of the bath temperature sensor 781 is taken in, and the detected temperature is set to a predetermined allowable range from the preset bath temperature. When the temperature drops, the chasing operation is performed for 3 minutes, for example, and the operation of the function of the heat retention mode is performed so that the temperature detected by the bath temperature sensor 781 becomes the bath set temperature.

  Next, basic control for realizing the bath reheating function and the heating function will be described with reference to FIG.

  The bath remote control device 81 is an operation unit for instructing hot water supply or chasing of the bath. The bath remote control device 81 is provided with a bath set temperature input operation unit 811, a reheating switch 812, and a bath automatic switch 813.

  Bath setting temperature input operation part 811 is an operation part which sets the temperature of bathtub hot water. The bathtub hot water temperature is set to an appropriate value, for example, around 40 ° C. Information on the set temperature is added to the controller 9 and the available heat quantity calculation unit 91.

  The reheating switch 812 is an on-switch for single operation of reheating bath water. The ON signal of the reheating switch 812 is applied to the controller 9. When the controller 9 finishes the chasing operation, the chasing switch 812 is automatically turned off.

  The bath automatic switch 813 is an on / off switch for automatic hot water filling, heat retention, and water retention operation to the bathtub 79. An ON signal of the bath automatic switch 813 is applied to the controller 9, and after the automatic hot water filling, after keeping the heat and water for about 4 hours, it is automatically turned off.

  When the ON signal of the bath automatic switch 813 is applied, the controller 9 heats the water passing through the heat exchanger 29 by the combustion of the burner 23 and pours hot water into the bathtub 79 through the hot water filling pipe line. At this time, for example, as shown in FIG. 4, relation data (PQ data) between the water level (P) of the bathtub and the amount of water (Q) given in advance to the memory unit 94 and the water level sensor 782 are detected. Pour water to the set water level of the bathtub based on the detected water level. Further, when the bath water temperature detected by the bath temperature sensor 781 obtained by driving the bath water circulating pump 77 is lower than the bath set temperature, the flow control valve 551 is opened so that the bath set temperature is reached, and the bath hot water is set. The circulation pump 77 is turned on to perform a bath water reheating operation. It should be noted that the controller 9 performs the bath water reheating operation so that the bath water temperature detected by the bath temperature sensor 781 becomes the bath set temperature even when the turn-on switch 812 is turned on.

  The high temperature heating remote control device 82 is an operation unit for instructing the operation of the high temperature heating terminal 61. The high temperature heating remote control device 82 is provided with a high temperature heating switch 821. The high temperature heating switch 821 is a switch that issues an on / off operation command for the operation of the high temperature heating terminal 61. An on / off signal of the high temperature heating switch 821 is applied to the controller 9. When the high temperature heating switch 821 is turned on, the high temperature terminal valve (thermal valve) 12 is energized to cause the PTC thermistor to generate heat and operate the thermo actuator. By such processing, the thermal valve 611 is opened after a predetermined time (for example, 1 minute) has elapsed. When the high temperature / high temperature heating switch 821 is turned off, energization to the thermal valve 611 is stopped and the thermal valve 611 is closed after a predetermined time (for example, 20 seconds) has elapsed.

  The low-temperature heating remote control device 83 is an operation unit for instructing the operation of the low-temperature heating terminal 62. The low-temperature heating remote control device 83 is provided with a low-temperature heating switch 831. The low temperature heating switch 831 is a switch that issues an on / off operation command for the operation of the low temperature heating terminal 62. An on / off signal of the low-temperature heating switch 831 is applied to the controller 9. When the low temperature heating switch 831 is turned on, the low temperature terminal valve (thermal valve) 561 is energized to cause the PTC thermistor to generate heat and operate the thermo actuator. By such processing, the thermal valve 561 opens after a predetermined time (for example, 1 minute) has elapsed. When the low temperature / low temperature heating switch 831 is turned off, energization to the thermal valve 561 is stopped and the thermal valve 561 is closed after a predetermined time (for example, 20 seconds) has elapsed.

  The controller 9 receives a command signal from each of the remote control devices described above, performs combustion control (including combustion amount control) of the burner 13 and rotation control of the combustion fan 14, and drives the heat medium circulation pump 51. The controller 9 feeds back the detected temperature of the heating high temperature thermistor 5122 so that the liquid at 80 ° C. can be supplied when the high temperature heating terminal 61 is operated, and performs the combustion control of the burner 13 and the rotation control of the combustion fan 14. Then, the latent heat exchanger 11 and the sensible heat exchanger 12 are heated, and the heating heat medium is heated so that the detected temperature of the heating high temperature thermistor 5122 becomes 80 ° C.

  The heated heating medium is led out from the sensible heat exchanger 12 at about 80 ° C. and flows through the pipe line 512. And if the high temperature terminal valve 611 is opened, it will flow from the pipe 512 → the pipe 520 → the pipe 523 → the pipe 612 → the high temperature terminal valve 611 → the high temperature heating terminal 61. The heating heat medium supplied to the high temperature heating terminal 61 dissipates heat when passing through the high temperature heating terminal 61. Accordingly, in the state where the temperature of the heating heat medium is lowered to, for example, about 60 ° C., the flow passes through the pipeline 613 → the heat medium confluencer 63 → the pipeline 631 → the pipeline 524 → the latent heat exchanger 11 and the latent heat exchanger 11 to warm. The heated heating heat medium flows through the pipe line 525 → the systern tank 53 → the pipe line 514 → the heat medium circulation pump 51. Thereafter, the heating heat medium flows through the pipe 511 and is heated by the sensible heat exchanger 12.

  Further, when the operation of the low temperature heating terminal 62 is also performed during the operation of the high temperature heating terminal 61, the controller 9 performs a hot dash at 80 ° C. for the first 30 minutes and thereafter supplies a heating medium for heating at 60 ° C. It can be so. At this time, the combustion control of the burner 13 and the rotation control of the combustion fan 14 are the same as in the operation of the high-temperature heating terminal 61, and the sensible heat exchanger 12 uses the heating high-temperature thermistor 5122. A liquid having an appropriate temperature (for example, about 80 ° C.) is derived.

  When the heat valve 561 is in the open state, the heating heat medium is the heat medium circulation pump 51 → the pipe 511 → the pipe 526 → the heat medium branch 56 → the low temperature terminal valve 561 → the pipe 621 → the low temperature heating terminal 62, and so on. Flowing. During operation of the high temperature heating terminal 61, the heating heat medium discharged from the heat medium circulation pump 51 is, for example, about 60 ° C., radiates heat through the low temperature heating terminal 62, and becomes lower than, for example, 40 ° C. Then, the heating heat medium flows in the order of the pipe line 622 → the heat medium merger 63 → the pipe line 631 → the pipe line 524 → the latent heat exchanger 11.

  When the high temperature heating terminal 61 is not operating, the controller 9 controls the temperature adjustment of the heating heat medium introduced into the low temperature heating terminal 62 based on the temperature detected by the heating low temperature thermistor 5121. That is, during normal operation of the low-temperature heating terminal 62, the low-temperature capacity switching thermal valve 47 is opened to adjust the combustion amount of the burner 13 so that the detected temperature of the heating low-temperature thermistor 5121 becomes, for example, 60 ° C. A heating heat medium is sent to the pipe 621.

  Further, immediately after the operation of the low-temperature heating terminal 62 is started, the heating pipe in the low-temperature heating terminal 62 and the heating heat medium in the pipe 622 are cooled. In the hot dash operation (cold start) when heating the heating heat medium in such a state, the detected temperature of the heating high temperature thermistor 5122 is set to, for example, 80 ° C. for a predetermined hot dash setting time such as 30 minutes. Thus, the low-temperature capacity switching thermal valve 47 is opened to adjust the combustion amount of the burner 13, and the heating heat medium is sent to the pipe line 621.

  When the flow control valve 551 is open, the heating heat medium flows from the pipe 512 → the pipe 520 → the pipe 521 → the hot heat exchanger 55 → the pipe 522 and then the pipe 524. The following flows from the pipe 524 to the latent heat exchanger 11 and is heated by the latent heat exchanger 11.

  The above is the basic operation of the heat source device that realizes the hot water supply function, the bath reheating function, and the heating function. Furthermore, in the heat source system 1 of the present embodiment, a heat source device and a cogeneration device including a fuel cell are combined. The fuel cell generates heat during power generation and needs to be cooled. The heat source system 1 improves the thermal efficiency of the entire system by heating the heating heat medium with this heat. Therefore, the specific contents of this will be described below.

  Returning to FIG. 1 again, a specific configuration of a cogeneration apparatus including a fuel cell will be described.

  Cogeneration device 200 includes a fuel cell 210, a hot water storage tank 220, a radiator 230, and a circulation pump 240.

  The fuel cell 210 is composed of a plurality of cells. The fuel cell 210 generates electricity by reacting hydrogen gas generated by a reformer (not shown) and oxygen in the air. The fuel cell 210 generates heat during power generation. Therefore, the fuel cell 210 is cooled by the liquid water while the liquid water is heated by exchanging heat with the liquid water. For this reason, a liquid water conduit is connected to the fuel cell 210. A pipe 205 is connected to the coolant outlet of the fuel cell 210. This pipe line 205 is connected to the inlet of the three-way valve 250. A pipe line 206 is connected to one outlet of the three-way valve 250, and a pipe line 207 is connected to the other outlet.

  The pipe line 206 is connected to the hot water inlet of the hot water storage tank 220. A pipe 209 is connected to the hot water outlet of the hot water storage tank 220. This pipe line 209 is connected to the hot water inlet of the three-way valve 260. A water supply pipe 201 is connected to the cold water inlet of the hot water storage tank 220, and a pipe 2011 branched from the water supply pipe 201 is connected to the cold water inlet of the three-way valve 260. A pipe 202 is connected to the cold water outlet of the hot water storage tank 220. This pipe line 202 is connected to the inlet of the radiator 230. The radiator 230 includes a radiator fan as shown in the figure. A pipe line 203 is connected to the outlet of the radiator 230. This pipe line 203 is connected to the suction port of the circulation pump 240. A pipeline 204 is connected to the discharge port of the circulation pump 240. This pipe line 204 is connected to the cooling water inlet of the fuel cell 210.

  The pipe line 207 is connected to the inlet of the liquid-liquid heat exchanger 54. A pipe 208 is connected to the outlet of the liquid-liquid heat exchanger 54. The pipe 208 is connected so as to join the pipe 203. As described above, the pipe 516 and the pipe 517 are connected to the liquid-liquid heat exchanger 54, and the heating heat medium flows. The liquid-liquid heat exchanger 54 heats the heating heat medium with the cooling water while cooling the cooling water as the heating heat medium and the cooling water for the fuel cell 210 flow.

  With such a configuration, when the three-way valve 250 is open to the pipe line 206 side, the cooling water discharged from the circulation pump 240 is pipe 205 → three-way valve 250 → pipe 206 → hot water storage tank 220 → It circulates with the pipe line 202-> radiator 230-> pipe line 203-> circulation pump 240. Further, when the three-way valve 250 is open to the pipe line 207 side, the cooling water discharged from the circulation pump 240 is pipe 205 → three-way valve 250 → pipe line 207 → liquid-liquid heat exchanger 54 → pipe line 208 → It circulates with the pipe line 203-> circulation pump 240.

  A thermistor (temperature sensor) is attached to the surface of the hot water storage tank 220. In FIG. 1, five thermistors 270 are attached. The inside of the hot water storage tank 220 is filled with cold water stored in the lower part and hot water (hot water) stored in the upper part. The thermistor 270 detects the position of the boundary between the cold water and hot water.

  During operation of the fuel cell 210, the cooling water discharged from the circulation pump 240 usually increases in temperature in the fuel cell 210, and flows through the pipe 205 → the three-way valve 250 → the pipe 206 to the hot water storage tank 220. Stored. Cold water flows out from the lower part of the hot water storage tank 220 and is sucked into the circulation pump 240. By such an operation, the boundary between the cold water and hot water inside the hot water storage tank 220 is lowered.

  When hot water is supplied, water is supplied from the pipeline 201 to the hot water storage tank 220. Hot water (hot water) flows out from the upper part of the hot water storage tank 220, flows from the pipe 209 to the three-way valve 260, and flows from the arrow Y to the hot water supply heat exchanger 20 via the water supply introduction pipe 71. If the temperature of the hot water (hot water) flowing out of the tank 220 is low, it is heated by the hot water supply heat exchanger 20. By such an operation, the boundary between the cold water and hot water inside the hot water storage tank 220 rises.

  In addition, in order to operate the burner 23 in order to operate the hot water supply heat exchanger 20, a predetermined time (for example, about 10 seconds) is required. Therefore, if the boundary between cold water and hot water detected by the thermistor 270 is above (that is, if the amount of hot water in the hot water storage tank is small), the burner 23 should be ignited. In this way, even if the hot water flowing out of the hot water storage tank 220 is switched from hot water to water, the water can be sufficiently heated by the hot water supply heat exchanger 20. If this is not done, when the hot water flowing out from the hot water storage tank 220 is supplied to the hot water supply destination, if the water flows out from the hot water storage tank 220, the water will not be heated in time, and the hot water supply destination will be filled with water. The situation that it supplies may occur. However, such a situation can be prevented by igniting the burner 23 in advance.

  The fuel cell 210 requires complicated processing to restart operation after stopping operation. Further, since the refrigerator and the like consume electricity for 24 hours, there is always a power generation request for the fuel cell 210. Therefore, the fuel cell 210 normally continues to operate without stopping. For this reason, it continues to generate heat with power generation even at midnight when hot water is not used. In the conventional type that does not have the liquid-liquid heat exchanger 54 of the present embodiment, the heat is only used to heat water to make hot water and store it in a hot water storage tank. In this case, when the hot water storage tank is filled with hot water, the fan of the radiator 230 must be turned to waste heat, which is one of the causes of deteriorating thermal efficiency.

  Therefore, in this embodiment, the heat of the radiator 230 is not rotated to waste heat, but is exchanged with the heating heat medium by the liquid-liquid heat exchanger 54. By doing in this way, heat can be used effectively and thermal efficiency improves.

  As a scene where the liquid-liquid heat exchanger 54 exchanges heat with the heating medium, a scene where preheating is performed prior to the use of a low-temperature heating terminal (for example, floor heating) can be considered. Therefore, specific control contents in such a scene will be described.

  FIG. 5 is a flowchart of the preheat control executed by the controller. This control is repeatedly executed at a predetermined time cycle.

  Next, with reference to FIG. 5, the preheat control will be described focusing on the operation of the controller.

  In step S110, the controller determines whether or not a use start time of a low-temperature heating terminal (for example, floor heating) is reserved. If the determination result is negative, the controller exits the process, and if the determination result is positive, the controller proceeds to step S120.

  In step S120, the controller determines whether or not the preheat start time before the use of the low temperature heating terminal has started. For example, when the use start time is 6:00 in the morning, the preheat start time may be set at a certain time before 30 minutes, or may be changed according to the temperature. The lower the timing, the faster the timing may be set. If the determination result is negative, the controller exits the process. If the determination result is affirmative, the controller proceeds to step S130.

  In step S130, the controller operates the heat medium circulation pump 51 and sets the three-way valve 250 to the pipe line 207 side. The low temperature operation valve 52 is closed, the low temperature terminal valve 561 is closed, and the high temperature terminal valve 611 is closed. In addition, about the burner 13, a non-operation state is continued.

  Since the above processing is repeatedly executed in a predetermined time cycle as described above, S100 → S110 → S120 → RETURN is repeatedly executed until the preheat start time is reached. → S110 → S120 → S130 → RETURN is executed.

  FIG. 6 is a diagram for explaining the flow of the cooling water and the heating heat medium when the preheat control of FIG. 5 is executed and the preheat start time comes. Note that the pipelines through which the cooling water / heating heating medium flows are shaded, and the flow directions of the cooling water / heating heating medium are indicated by arrows.

  When the preheat start time comes, the controller executes S100 → S110 → S120 → S130 → RETURN as described above. Then, the cooling water discharged from the circulation pump 240 is, as shown by the hatching and arrow in FIG. 6, the pipe 205 → the three-way valve 250 → the pipe 207 → the liquid-liquid heat exchanger 54 → the pipe 208 → the pipe. Circulate with the passage 203 → circulation pump 240. Further, the heating heat medium discharged from the heat medium circulation pump 51 flows into the pipe line 511, and a part of the heating medium is divided into the pipe line 516 on the way. The heating heat medium that continues to flow through the pipe 511 is the pipe 511 → the sensible heat exchanger 12 → the pipe 512 → the low-temperature operating valve 52 (operating valve bypass pipe 515) → the pipe 513 → the cistern tank 53 → the pipe 514 → the heat medium circulation pump 51 flows. On the other hand, the heating heat medium that is diverted from the pipe 511 and flows through the pipe 516 flows in the order of the pipe 516 → the liquid-liquid heat exchanger 54 → the pipe 517 and joins the pipe 513. When the heating heat medium flows through the liquid-liquid heat exchanger 54, heat exchange with the cooling water is performed, so that the heating heat medium is heated by the cooling water while the cooling water is cooled. Therefore, heat can be used effectively and thermal efficiency is improved.

  According to the configuration of the present embodiment, the heating heat medium flows to the sensible heat exchanger 12 without flowing to the latent heat exchanger 11. The latent heat exchanger 11 is above the tray 41 described above. In this case, an external wind may flow backward from the exhaust port 100 of the heating heat exchanger 10, and the heating heat medium of the latent heat exchanger 11 may be cooled by the wind. On the other hand, according to the configuration of the present embodiment, the heating heat medium flows to the sensible heat exchanger 12 without flowing to the latent heat exchanger 11. Since the sensible heat exchanger 12 is below the receiving tray 41, the receiving tray 41 serves as a windbreak to prevent the wind from hitting the sensible heat exchanger 12, and the sensible heat exchanger 12 is not easily cooled. Therefore, it does not waste heat unnecessarily and exhibits excellent thermal efficiency.

  FIG. 7 is a flowchart of heating heat exchanger operation control executed by the controller.

  When the use start time of the low temperature heating terminal is reached, or when the high temperature heating switch 821, the low temperature heating switch 831 and the reheating switch 812 are operated and the heat exchanger for heating is activated, the controller performs the following processing.

  In step S210, the controller determines whether or not to operate the heating heat exchanger. If the determination result is negative, the controller does not enter the process. If the determination result is positive, the controller proceeds to step S220.

  In step S220, the controller operates the heat medium circulation pump 51 and the burner 13.

  In step S230, the controller executes a valve opening / closing process corresponding to the terminal to be used. Specific contents of the processing will be described later.

  In step S240, the controller determines whether or not the detected temperature of the thermistor 5241 exceeds 40 ° C. If the determination result is negative, that is, unless the temperature exceeds 40 ° C., the controller proceeds to step S250. If the determination result is affirmative, that is, exceeds 40 ° C., the controller proceeds to step S260. .

  In step S250, the controller sets the three-way valve 250 to the pipe line 207 side.

  In step S260, the controller sets the three-way valve 250 to the pipe line 206 side.

  FIG. 8 is a flowchart of a valve opening / closing process executed by the controller.

  In step S231, the controller determines whether or not to use the low-temperature heating terminal. If the determination result is negative, the controller proceeds to step S232, and if the determination result is positive, the controller proceeds to step S233.

  In step S232, the controller closes the low temperature terminal valve 561.

  In step S233, the controller opens the low temperature operation valve 52 and opens the low temperature terminal valve 561.

  In step S234, the controller determines whether to use the high-temperature heating terminal. If the determination result is negative, the controller proceeds to step S235, and if the determination result is positive, the controller proceeds to step S236.

  In step S235, the controller closes the high temperature terminal valve 611.

  In step S236, the controller closes the low temperature operation valve 52 and opens the high temperature terminal valve 611.

  In step S237, the controller determines whether to catch up. If the determination result is negative, the controller proceeds to step S238, and if the determination result is positive, the controller proceeds to step S239.

  In step S238, the controller closes the flow control valve 551.

  In step S236, the controller closes the low temperature operation valve 52 and opens the flow control valve 551.

  Next, the flow of the heating heat medium when the above processing is executed will be described.

  FIG. 9 is a diagram for explaining the flow of the heating heat medium when only the low-temperature heating terminal is used and the detected temperature of the thermistor 5241 does not exceed 40 ° C.

  First, with reference to FIG. 9, a case where only the low temperature heating terminal is used (the high temperature heating terminal is not used and the reheating is not performed) will be described. This is the case, for example, when the use of the low-temperature heating terminal is started at the reserved time, or when only the low-temperature heating switch 831 is operated.

  In this case, as long as the detected temperature of the thermistor 5241 does not exceed 40 ° C., the controller executes S200 → S210 → S220 → S230 → S231 → S233 → S234 → S235 → S237 → S238 → S240 → S250 → RETURN. . Then, the cooling water discharged from the circulation pump 240 is, as shown in FIG. 9, the pipe 205 → the three-way valve 250 → the pipe 207 → the liquid-liquid heat exchanger 54 → the pipe 208 → the pipe 203 → the circulation pump. 240, and so on. This is the same as in preheat control.

  Further, the heating heat medium discharged from the heat medium circulation pump 51 flows into the pipe line 511, and a part of the heat medium is divided into the pipe line 526 on the way. A part of the heating heat medium that continues to flow through the pipe 511 is further divided into the pipe 516 along the way. The heating heat medium that continues to flow through the pipe line 511 and the heating heat medium that flows from the pipe line 511 and flows through the pipe line 516 flow in the same manner as in preheat control.

  The heating heat medium branched from the pipe 511 to the pipe 526 is the pipe 526 → the heat medium branching device 56 (low temperature terminal valve 561) → the pipe 621 → the low temperature heating terminal 62 → the pipe 622 → the heat medium junction 63. → Pipe 631 → Pipe 524 → Latent heat exchanger 11 → Pipe 525, and merges into pipe 513.

  The heating heat medium whose temperature has been lowered by flowing through the low-temperature heating terminal 62 is heated by the latent heat (condensation heat) of water vapor contained in the combustion gas of the burner 13 by flowing through the latent heat exchanger 11, which is favorable. Heat efficiency can be obtained.

  Further, by using not only the heating heat exchanger 10 but also the liquid-liquid heat exchanger 54, the heating heat medium can be heated using the waste heat of the fuel cell 210, so that the thermal efficiency is very good.

  FIG. 10 is a diagram for explaining the flow of the heating heat medium when only the low-temperature heating terminal is used and the detected temperature of the thermistor 5241 exceeds 40 ° C.

  When the detected temperature of the thermistor 5241 exceeds 40 ° C., the controller executes S200 → S210 → S220 → S230 → S231 → S233 → S234 → S235 → S237 → S238 → S240 → S260 → RETURN. The valve 250 is switched. As a result, as shown in FIG. 10, the cooling water discharged from the circulation pump 240 flows through the pipe 205 → the three-way valve 250 → the pipe 206 → the hot water storage tank 220 and is stored in the hot water storage tank 220. Cooling water in the lower part of the hot water storage tank 220 flows through the hot water storage tank 220 → the pipe line 202 → the radiator 230 → the pipe line 203 and is sucked into the circulation pump 240.

  In the latent heat exchanger 11, the latent heat (condensation) when the state of the water vapor (water) contained in the combustion gas changes from a temperature higher than 100 ° C. to a temperature lower than 100 ° C. Heat) can be fully utilized. However, if the temperature of the heating heat medium introduced into the latent heat exchanger 11 is high, the amount of heat exchange decreases, and there is a possibility that the latent heat (condensation heat) cannot be fully utilized.

  On the other hand, in this embodiment, when the temperature detected by the thermistor 5241 exceeds 40 ° C., the three-way valve 250 is switched to stop heating the heating heat medium by the cooling water of the fuel cell. By doing in this way, it can avoid that the temperature of the heating heat medium introduced into the latent heat exchanger 11 becomes high and the latent heat (condensation heat) cannot be sufficiently utilized, and good thermal efficiency can be obtained. It is.

  FIG. 11 is a diagram for explaining the flow of the heating heat medium when only the high-temperature heating terminal is used and the temperature detected by the thermistor 5241 does not exceed 40 ° C.

  Subsequently, a case where only the high-temperature heating terminal is used (the low-temperature heating terminal is not used and the reheating is not performed) will be described. This is the case, for example, when only the high temperature heating switch 821 is operated.

  In this case, as long as the detected temperature of the thermistor 5241 does not exceed 40 ° C., the controller executes S200 → S210 → S220 → S230 → S231 → S232 → S234 → S236 → S237 → S238 → S240 → S250 → RETURN. . Then, the cooling water discharged from the circulation pump 240 is, as shown in FIG. 11, the pipe 205 → the three-way valve 250 → the pipe 207 → the liquid-liquid heat exchanger 54 → the pipe 208 → the pipe 203 → the circulation pump. 240, and so on.

  Further, the heating heat medium discharged from the heat medium circulation pump 51 flows into the pipe line 511, and a part of the heating medium is divided into the pipe line 516 on the way. Further, the heating heat medium that continues to flow through the pipe line 511 flows in the order of the pipe line 511 → the sensible heat exchanger 12 → the pipe line 512, and a part of the heating medium is divided into the pipe line 520. Since these flows (the flow in the pipe 512 and the flow that flows from the pipe 511 and flows through the pipe 516) are the same as those in the preheat control, the description thereof is omitted.

  The heating heat medium divided from the pipe line 512 to the pipe line 520 is the pipe line 520 → the pipe line 523 → the pipe line 612 → the high temperature heating terminal 61 (high temperature terminal valve 611) → the pipe line 613 → the heat medium merger 63 → the pipe. The flow passes through the path 631 → the pipe 524 → the latent heat exchanger 11 → the pipe 525, and joins the pipe 513.

  The heating heat medium whose temperature has decreased by flowing through the high-temperature heating terminal 61 is heated by the latent heat (condensation heat) of water vapor contained in the combustion gas of the burner 13 by flowing through the latent heat exchanger 11, which is favorable. Heat efficiency can be obtained.

  Further, by using not only the heating heat exchanger 10 but also the liquid-liquid heat exchanger 54, the heating heat medium can be heated using the waste heat of the fuel cell 210, so that the thermal efficiency is very good.

  When the detected temperature of the thermistor 5241 exceeds 40 ° C., the controller executes S200 → S210 → S220 → S230 → S231 → S232 → S234 → S236 → S237 → S238 → S240 → S260 → RETURN. The valve 250 is switched. As a result, the cooling water discharged from the circulation pump 240 flows through the pipe 205 → the three-way valve 250 → the pipe 206 → the hot water storage tank 220 and is stored in the hot water storage tank 220 and the cooling water below the hot water storage tank 220. Flows through the hot water storage tank 220 → the pipe line 202 → the radiator 230 → the pipe line 203 and is sucked into the circulation pump 240.

  By doing so, heating of the heating heat medium by the cooling water of the fuel cell is stopped, the temperature of the heating heat medium introduced into the latent heat exchanger 11 becomes high, and latent heat (condensation heat). Can be avoided, and good thermal efficiency can be obtained.

  FIG. 12 is a diagram for explaining the flow of the heating medium when the reheating is performed while using the low-temperature heating terminal but the high-temperature heating terminal is not used and the detected temperature of the thermistor 5241 does not exceed 40 ° C. It is.

  Next, a description will be given of a case where the low-temperature heating terminal is used and the high-temperature heating terminal is not used. This is the case, for example, when the low temperature heating switch 831 is operated and the low temperature heating terminal is used, and the reheating switch 812 or the bath automatic switch 813 is further operated to reheat.

  In this case, as long as the detected temperature of the thermistor 5241 does not exceed 40 ° C., the controller executes S200 → S210 → S220 → S230 → S231 → S233 → S234 → S235 → S237 → S239 → S240 → S250 → RETURN. .

  In this case, basically, the cooling water discharged from the circulation pump 240 and the heating heat medium discharged from the heat medium circulation pump 51 flow in the same manner as when only the low-temperature heating terminal is used. In addition, a part of the heating heat medium flowing through the pipe 512 is diverted to the pipe 520 on the way. The heating heat medium divided into the pipe 520 flows in the order of the pipe 520 → the pipe 521 → the reheating heat exchanger 55 → the pipe 522, and joins the pipe 524.

  The heating heat medium whose temperature has decreased by flowing through the low-temperature heating terminal 62 / reheating heat exchanger 55 flows through the latent heat exchanger 11, thereby causing latent heat (condensation heat) of water vapor contained in the combustion gas of the burner 13. It will be heated and favorable thermal efficiency will be obtained.

  Further, by using not only the heating heat exchanger 10 but also the liquid-liquid heat exchanger 54, the heating heat medium can be heated using the waste heat of the fuel cell 210, so that the thermal efficiency is very good.

  When the temperature detected by the thermistor 5241 exceeds 40 ° C., the three-way valve 250 is switched. As a result, the cooling water discharged from the circulation pump 240 flows through the pipe 205 → the three-way valve 250 → the pipe 206 → the hot water storage tank 220 and is stored in the hot water storage tank 220 and the cooling water below the hot water storage tank 220. Flows through the hot water storage tank 220 → the pipe line 202 → the radiator 230 → the pipe line 203 and is sucked into the circulation pump 240.

  By doing so, heating of the heating heat medium by the cooling water of the fuel cell is stopped, the temperature of the heating heat medium introduced into the latent heat exchanger 11 becomes high, and latent heat (condensation heat). Can be avoided, and good thermal efficiency can be obtained.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

  For example, the heating medium branching device 56 and the heating medium junction unit 63 are not limited to the heating device shown in FIG. 1, and other heating devices may be appropriately connected as necessary.

  In the above description, the fuel cell is described as an example of the heating element, but a power generation device using a gas engine or the like may be used.

  The above embodiments can be appropriately combined.

DESCRIPTION OF SYMBOLS 10 Heat exchanger for heating 11 Latent heat exchanger 12 Sensible heat exchanger 13 Burner 51 Heat-medium circulation pump 52 Actuation valve 53 Systurn tank 54 Liquid-liquid heat exchanger 55 Reheating heat exchanger 61 High temperature heating terminal 62 Low temperature heating terminal 551 Flow control valve 561 Low temperature terminal valve 611 High temperature terminal valve 511, 512, 513, 514 Heating medium circulation line for heating 515 Actuating valve bypass line 516, 517 Heat exchange line 520, 521, 522 Reheating heat exchange line 520, 523, 612, 613 High-temperature heating terminal line 526, 621, 622 Low-temperature heating terminal line 78, 791, 792 Reheating circulation line 210 Heating element (fuel cell)
220 hot water storage tank 240 liquid water pump 250 three-way valve 207,208 tank bypass line S100 preheat control unit S200 heating heat exchanger operation control unit

Claims (9)

A sensible heat exchanger that heats a heating heat medium with heat generated by a burner, and a latent heat heat exchanger that heats the heating heat medium with heat that has passed through the sensible heat exchanger and the temperature has decreased. A heat exchanger for heating,
A heat medium circulation pump for pumping the heating heat medium;
A cistern tank capable of storing the heating heat medium;
A heating heat medium circulation line for flowing the heating heat medium pumped from the heat medium circulation pump to the sensible heat exchanger and the cistern tank in this order and flowing again to the heat medium circulation pump;
An operating valve that is provided in the middle of the heating medium circulation line between the sensible heat exchanger and the cistern tank, and controls the flow rate of the heating medium;
An operating valve bypass line for bypassing the operating valve;
The heat branched from the heating heat medium circulation line between the heat medium circulation pump and the sensible heat exchanger and joined to the heating heat medium circulation line between the operation valve and the cistern tank An exchange line,
A heating element;
A liquid water pump for supplying liquid water to the heating element;
A hot water storage tank for storing liquid water heated through the heating element;
A tank bypass pipe for bypassing the liquid water heated by the heating element without flowing into the hot water storage tank;
A three-way valve for switching the flow direction of all or part of the liquid water heated by the heating element to the hot water storage tank or the tank bypass conduit;
A liquid-liquid heat exchanger for exchanging heat between the liquid water flowing through the tank bypass pipe and the heating heat medium flowing through the heat exchange pipe;
Having a heat source system. The heat source system according to claim 1,
A low temperature heating terminal line branched from a heating medium circulation line for heating between the heat medium circulation pump and the sensible heat exchanger;
A low-temperature heating terminal provided in the low-temperature heating terminal pipeline;
A low-temperature terminal valve that opens when the heating medium flows through the low-temperature heating terminal; and
Having a heat source system. The heat source system according to claim 1 or 2,
A high temperature heating terminal line branched from a heating medium circulation line for heating between the sensible heat exchanger and the operation valve;
A high-temperature heating terminal provided in the high-temperature heating terminal pipeline;
A high temperature terminal valve that opens when the heating medium is allowed to flow to the high temperature heating terminal;
Having a heat source system. The heat source system according to any one of claims 1 to 3,
Reheating heat exchange line branched from the heating medium circulation line for heating between the sensible heat exchanger and the operation valve;
A recirculation circuit that circulates hot water in the bathtub,
A reheating heat exchanger for exchanging heat between the heating heat medium flowing through the reheating heat exchange line and the bathtub hot water flowing through the recirculation circulation line;
A flow rate control valve that opens when the heating heat medium is allowed to flow to the reheating heat exchanger;
Having a heat source system. In the heat source system according to any one of claims 1 to 4,
When the use start time of the low temperature heating terminal is reserved and the preheat time is reached, prior to starting the use of the low temperature heating terminal, without igniting the heating heat exchanger, With the operation valve, the high temperature terminal valve, and the low temperature terminal valve closed, the three-way valve is on the tank bypass line side and has a preheat control unit that operates the heat medium circulation pump.
Heat source system. The heat source system according to any one of claims 1 to 5,
When using at least the low temperature heating terminal or the high temperature heating terminal, the burner is burned to operate the heat medium circulation pump, and the low temperature terminal valve and the high temperature terminal valve according to the heating terminal to be used, If the temperature of the heating heat medium flowing downstream from the junction of the low temperature heating terminal line and the high temperature heating terminal line is lower than a reference temperature, the opening and closing of the operation valve is controlled. It has a heat exchanger operation control unit for heating that is on the bypass line side and has the three-way valve on the hot water tank side if it is high,
Heat source system. The heat source system according to claim 6, wherein
The heating heat exchanger operation control unit is
When using the low-temperature heating terminal, the low-temperature terminal valve is opened and the operating valve is opened,
When the low temperature heating terminal is not used, the low temperature terminal valve is closed.
Heat source system. The heat source system according to claim 6 or 7,
The heating heat exchanger operation control unit is
When using the high temperature heating terminal, the high temperature terminal valve is opened and the operating valve is closed,
When the high temperature heating terminal is not used, the high temperature terminal valve is closed.
Heat source system. The heat source system according to any one of claims 6 to 8,
The heating heat exchanger operation control unit is
When replenishing, the flow control valve is opened and the operating valve is closed,
If not replenished, close the flow control valve,
Heat source system.