JP2020046090A - Heat exchange control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to use a device for exchanging heat between a combustion gas and a refrigerant even while the use of the combustion gas is restricted. SOLUTION: Although power generation is stopped due to gas consumption restriction, attention is paid to the fact that the temperature of hot water in a hot water storage tank 32 is secured to some extent, and a part of the temperature is used as a heat source for heat exchange in a floor heating device 70. I tried to use it. In the heat exchanger 76, the pump 76A is driven while the main heat exchange is stopped to circulate the hot water in the hot water storage tank 32 through the hot water storage tank pipe 84. The water in the circulation pipe 78 is heated by receiving heat from the hot water storage tank pipe 84, and is dissipated from the heat radiation pipe 74A to continue floor heating. Continuation of floor heating control by sub-heat exchange is inferior to floor heating control by main heat exchange, but it is possible to suppress a sudden drop in the temperature in the living room. [Selection diagram] Fig. 3

Description

  The present invention relates to a heat exchange control device for controlling a heat exchange operation of a gas consuming device under the control of a microcomputer meter for managing gas consumption.

  A cogeneration device, for example, a household fuel cell cogeneration device is a system in which a hot water storage unit and a fuel cell unit are provided in parallel.

  In the fuel cell unit, gas is continuously consumed for the purpose of power generation, and the heat generated by the power generation heats the water in the hot water storage unit to generate hot water.

  On the other hand, the gas microcomputer meter is equipped with a safety function for detecting leakage of the gas pipe (particularly, a very small leakage in this case). In the safety function, for example, an alarm is issued when a minute leak of gas continues for 30 days.

  For this reason, in the fuel cell unit, although it is a normal specification that the gas is continuously consumed for the purpose of power generation, a certain power generation stoppage is made before 30 days elapse so that the safety function does not operate. A period is provided (see Patent Document 1).

  By the way, if another gas consuming device is used (when gas is consumed) during the power generation suspension period in the fuel cell unit, it is erroneously recognized that the gas leakage is continuing, and an alarm is issued. There are cases. Therefore, a technique has been proposed for preventing other gas consuming devices from being used during the power generation suspension period of the fuel cell unit (see Patent Document 2).

  Further, the user may be urged not to use a device that exchanges heat of the refrigerant with the combustion gas (for example, a hot-water floor heating system described in Patent Literature 3).

  Patent Literature 1 discloses that, on a day (27 days) corresponding to three days before a period (30 days) for determining that a small amount of gas is leaking, power generation is stopped all day, and when one day elapses, A configuration in which power generation is permitted is described as a state in which the start prohibition release condition is satisfied.

  Patent Document 2 discloses a method for generating a fuel gas non-consumption state so as to appropriately bring about a fuel gas non-consumption state even when a heating combustion operation process is performed during execution of a leakage determination avoidance stop process. That the heating combustion operation process is performed after the set elapsed time has elapsed.

  For reference, Patent Literature 3 discloses a general structure of a hot-water floor heating system. That is, a pipe for circulating hot water between the heat source device using the combustion gas and the floor heating panel is constructed, and the heat exchange in the heat source device heats the hot water circulating in the pipe, and the floor heating panel. This is a system that heats the living room with heat radiation from the room.

JP 2005-353292 A JP 2018-73515 A JP 2006-145119 A

  However, conventionally, the inability to use the gas consuming device during the power generation suspension period imposes a restriction on the use of the gas consuming device, and lowers the reliability of the gas-related equipment including the cogeneration device. In particular, in the winter season, the hot water floor heating system cannot be used because the reliability of users is greatly reduced compared to other gas-related facilities such as hot water supply equipment.

  An object of the present invention is to provide a heat exchange control device that can use a device that performs heat exchange with a refrigerant by using a combustion gas even while the use of the combustion gas is being restricted.

  The heat exchange control device according to the present invention includes a first heat exchange process for performing floor heating by performing heat exchange between a combustion heating unit using combustion gas as a heat source and a floor heating refrigerant, and the combustion gas A pipe portion that can be switched to any one of heat exchange processes of a second heat exchange process for performing floor heating by performing heat exchange between a heating element having a heat source other than the heat source and a floor heating refrigerant; A selection unit that selects the first heat exchange process when the use of the gas is possible, and selects the second heat exchange process when the use of the combustion gas is restricted; And a switching control unit for switching to a heat exchange process.

  According to the present invention, the pipe section includes the first heat exchange processing and the second heat exchange processing, and can be switched to either one. The selection unit selects the first heat exchange process when the use of the combustion gas is possible, and selects the second heat exchange process when the use of the combustion gas is restricted.

  The switching control unit switches to the selection unit that selects the second heat exchange process when the use of the combustion gas is restricted, and to the heat exchange process selected by the selection unit.

  Thus, the heat exchange process can be performed regardless of whether the combustion gas can be used.

  For example, in a floor heating device, a first heat exchange process is usually performed using combustion gas as a heat source to heat a circulating refrigerant (water) and radiate heat from a floor heating panel, but the combustion gas cannot be used as a heat source. Performs a second heat exchange process to heat the circulating refrigerant. In this case, a difference may be provided between the heat exchange efficiency (main heat exchange efficiency) of the first heat exchange process and the heat exchange efficiency (sub heat exchange efficiency) of the second heat exchange process (main heat exchange efficiency). > Secondary heat exchange efficiency).

  In the present invention, the heating element is hot water stored in a hot water storage tank.

  For example, there is a case where excess hot water is stored in a hot water storage tank, and this hot water can be used as a heating element.

  In the present invention, the hot water storage tank is a part of a cogeneration device provided with a power generation unit, and the hot water in the hot water storage tank is heated by using heat generated at the time of power generation of the power generation unit. Features.

  The power generation unit generates heat when generating power, and the generated heat is used for heating hot water in the hot water storage tank.

  In the present invention, the time when the use of the combustion gas is restricted is predicted, and at the start time of the predicted period, the temperature and the amount of hot water in the hot water storage tank are maximized within an allowable range. It is characterized by limiting the consumption of hot water inside.

  When it is possible to predict when the use of the combustion gas is restricted (including known times), the hot water storage tank is set so that the temperature and the amount of hot water in the hot water storage tank become the maximum allowable range at the start time of the predicted period. By limiting the consumption of hot water inside, for example, the utilization rate of the floor heating device as a heating element for sub-heat exchange can be increased.

  In the present invention, the heating element may be an electric heater provided exclusively for the second heat exchange process in a dedicated pipe for floor heating, or an electric heater provided in advance for preventing freezing of piping equipment. It is characterized by having.

  An electric heater can be used as a heating element irrespective of restrictions on the use of combustion gas.

  As described above, according to the present invention, for example, heat can be exchanged using the heat storage of the hot water storage tank. In particular, the heat storage (temperature and amount of hot water) can be maximized by predicting the timing of using the heat storage of the hot water storage tank. By doing so, it is possible to improve the utilization rate for the second heat exchange process (the sub-heat exchange process for floor heating, etc.).

  ADVANTAGE OF THE INVENTION According to this invention, the effect that the apparatus which performs heat exchange with the refrigerant | coolant by combustion gas can be utilized, even if the use restriction of combustion gas is under way.

It is a schematic diagram of a cogeneration device according to the present embodiment. FIG. 2 is a block diagram illustrating a configuration of a controller according to the present embodiment. It is a schematic structure figure of a floor heating device concerning this embodiment. A characteristic diagram showing a difference in control temperature between the case where the floor heating is stopped as in the related art during the gas consumption restriction period (hereinafter referred to as the conventional example) and the case where the floor heating is performed by the auxiliary heat exchange (referred to as the present embodiment). It is. 4 is a flowchart illustrating a heat exchange source switching control routine according to the present embodiment. It is a schematic structure figure of a floor heating device concerning modification 1 of this embodiment. It is a schematic structure figure of a floor heating device concerning modification 2 of this embodiment.

  FIG. 1 is a schematic diagram of a household fuel cell cogeneration device according to the present embodiment (hereinafter, referred to as “ENE-FARM 10” in the present embodiment) as an example of the cogeneration device of the present invention. It is shown.

  The energy farm 10 is a system in which a hot water storage unit 12 and a fuel cell unit 14 are provided side by side. It should be noted that juxtaposition does not mean that they are physically adjacent to each other, but means that they cooperate with each other. That is, the hot water storage unit 12 and the fuel cell unit 14 may be installed separately from each other and connected by piping, electric wiring, or the like.

  The energy farm 10 is controlled by a controller 16.

  (Configuration of Controller 16)

  As shown in FIG. 2, the controller 16 includes a microcomputer 34 including a CPU 34, a RAM 36, a ROM 38, an I / O 40, and a bus 42 such as a data bus and a control bus connecting these.

  The I / O 40 is connected to a controlled device 12D of the hot water storage unit 12 and a controlled device 14D of the fuel cell unit 14, and controls respective operations under the control of the controller 16.

  Further, a remote control panel 46, a microcomputer gas meter 50, and a smart meter 63 are connected to the I / O 40.

  The water temperature in the hot water storage tank 32 (see FIG. 1) described later is classified into a plurality of temperature layers. The I / O 40 is connected to a plurality of thermistors 51 (not shown in FIG. 1) for detecting the temperature of the hot water stored in the hot water storage tank 32.

  The temperature of water rises as it goes up. For this reason, the water temperature in the hot water storage tank 32 is such that the temperature of the uppermost layer is high (high temperature), the temperature decreases toward the lower layer, and the temperature of the lowermost layer is low (low temperature).

  The thermistor 51 detects the temperature of each layer (for example, when classified into four layers, each of the four layers) in the hot water storage tank 32. The controller 16 controls the timing of water supply and the amount of water supplied from the water pipe 33 (see FIG. 1) based on the temperature detected by the thermistor 51.

  As shown in FIG. 1, the hot water storage unit 12 includes a hot water storage tank 32. In addition, the fuel cell unit 14 takes in a gas (for example, city gas 13A) from the gas supply pipe 18 to purify hydrogen, and generates power by performing processing centering on reforming with hydrogen and oxygen. A stack 22 for storing electricity and an inverter 28 for converting the electric power (DC) stored in the stack 22 into AC and supplying it to a power consuming device 24 such as home appliances (home appliances) and lighting in a house 48 are provided. .

  Although home appliances and lighting are mentioned as typical examples of the power consuming devices 24, in the present embodiment, the power consuming devices 24 are all electric components required in the house 48, including home appliances and lighting. It indicates a consumer device (for example, control target devices 12D and 14D (see FIG. 2) related to the ENE-FARM 10, a power source of the remote control panel 46, and the like).

  The fuel cell unit 14 generates heat when power is generated by the stack 22, and thus needs to be cooled.

  On the other hand, in the hot water storage unit 12, tap water or the like is introduced into the hot water storage tank 32 (water supply), and it is necessary to heat (heat) the hot water supply equipment 49 (shower, bath, sink, etc.) in order to use it. .

  For this reason, the fuel cell unit 14 includes a heat exchanger 30. In the heat exchanger 30, the high heat generated by the power generation in the stack 22 and the hot water storage tank provided in the hot water storage unit 12 via the water pipe 33 are provided. The low heat of the water supplied into the heat exchanger 32 is exchanged.

  The water pipe 33 is provided with a heater (mainly an electric heater) not shown, and the water pipe 33 and peripheral devices may be prevented from freezing by heating the water pipe 33 with the heater.

  The inverter 28 that forms a part of the fuel cell unit 14 is connected to a switching unit 62 that controls switching with a commercial power supply 60. The switching unit 62 switches the power supply source (the power generated by the fuel cell unit 14 or the power from the commercial power supply 60) based on an instruction from the controller 16.

  On the downstream side of the switching unit 62, a smart meter 63 is attached as a meter for monitoring the power consumption state.

  The power generated by the fuel cell unit 14 or the power from the commercial power supply 60 is input to the smart meter 63 depending on the switching by the switching unit 62 and supplied to the power consuming device 24. . In other words, when the user uses the power consuming device 24, any power is supplied, so that the power consuming device 24 can be used without any problem.

  The smart meter 63 is connected to the controller 16, and a power source is displayed on a remote control panel 46 controlled by the controller 16.

  On the other hand, a microcomputer gas meter 50 is attached to the gas supply pipe 18. A branch portion 18A is provided on the downstream side of the microcomputer gas meter 50, and one branch pipe 18B serves as a pipeline for supplying gas to the fuel processor 20. Further, the other branch pipe 18C is further provided with a branch portion 18D, and the one branch pipe 18E serves as a conduit for supplying gas to gas consuming equipment 66 (hob, gas fan heater, etc.) in the house 48. The other branch pipe 18F serves as a pipe for supplying gas to the combustion heating section 72 which constitutes a part of the floor heating device 70.

  (Configuration of floor heating device 70)

  The floor heating device 70 includes a floor heating panel 74, and warms the air in the living room by repeatedly supplying and recovering hot water to the heat radiation pipe 74A embedded in the floor heating panel 74 (circulation structure). To heat.

  In the present embodiment, as means (heating source) for heating water in the heat radiating pipe 74A, a combustion heating unit 72 (main heat exchange) and a heat exchanger 76 (sub heat exchange) are provided. Either the main heat exchange or the sub heat exchange is selected based on predetermined conditions, and heat exchange control is performed. The detailed configuration of the floor heating device 70 and the heat exchange control will be described later.

  (Micro leak monitoring function by microcomputer gas meter 50)

  As shown in FIG. 1, the microcomputer gas meter 50 has a plurality of functions of measuring a flow rate of a supplied gas and monitoring an abnormality in the supply of the gas. The main monitoring functions include an abnormal outflow monitoring function, a seismic function, a pressure monitoring function, and a long-time use monitoring function.

  In addition, the microcomputer gas meter 50 has a "micro leak monitoring function" as a safety function, although it does not actively shut off the gas supply, in addition to the main monitoring function described above.

  In the micro leak monitoring function, an alarm is issued (flashing of an alarm lamp, etc.) when the micro leak continues for 30 days.

  The “trace amount” is a gas flow rate that is not determined to be abnormal by the above-described abnormal outflow monitoring function, pressure monitoring function, and long-time use monitoring function, and is determined from a predetermined permissible leakage range per unit time.

  Further, the definition of “continuation” is that gas flows without an interval of one hour or more. In other words, a flow interruption of less than one hour (for example, 59 minutes) is recognized as “continuation”.

  Here, since the ENE-FARM 10 normally consumes gas for the purpose of power generation, a certain power generation stop period is provided before 30 days elapse so that the trace leakage monitoring function does not work. I have to. As an example, once every 27 days of continuous operation, a power generation suspension period of a fixed time (24 hours) is provided, and the alarm counter of the safety function is reset.

  On the other hand, in order to avoid continuation in the trace leakage monitoring function and to interrupt the flow, the remote control panel 46 is used for the gas consuming devices 66 (and the combustion heating section 72 of the floor heating device 70) other than the ENE-FARM 10 so as not to consume the gas. Is notified to the user by using the display function of.

  When restricting the use of gas to users, it may be possible to minimize disruption to life depending on the season and time of day. However, on the other hand, in winter, the inability to use the floor heating device 70 makes it difficult to secure a comfortable living space, and for the user, it is more mental and physical than the use restrictions of other gas consuming devices 66. The burden on both targets is large.

  Therefore, in the present embodiment, in order to avoid continuation in the trace leakage monitoring function, in the ENE-FARM 10 in which the power generation is stopped, similarly to the gas consuming device 66, the inside of the hot water storage tank 32 heated until the power generation is stopped. By using the hot water, the minimum required floor heating function was secured.

  FIG. 3 is a schematic configuration diagram for performing switching control of the heat exchange control by the main heat exchange or the sub heat exchange by the controller 16 in the schematic configuration of the floor heating device 70 and the piping structure of the floor heating device 70.

  The floor heating device 70 includes a floor heating panel 74, and has a circulation structure that repeatedly supplies and recovers hot water to a heat radiation pipe 74A embedded in the floor heating panel 74.

  The floor heating panel 74 is laid on the floor of a specific living room of the house 48, and heats and heats the air in the living room by flowing hot water through the heat radiation pipe 74A.

  The heat radiation pipe 74 </ b> A is connected to a circulation pipe 78 provided outside the floor heating panel 74, and circulates by driving a pump 80.

  The circulation pipe 78 passes through the combustion chamber of the combustion heating section 72. A burner 72A is provided in the combustion chamber of the combustion heating section 72, and water flowing in the circulation pipe 78 is heated in the combustion chamber by the burner 72A burning (that is, gas consumption), and a predetermined temperature is maintained. Can be (main heat exchange). When the temperature of the hot water in the heat radiating pipe 74A is sufficient, the three-way valve 82 can be switched to circulate through the combustion heating unit 72.

  Here, floor heating device 70 according to the present embodiment includes a heat exchanger 76 separately from combustion heating unit 72. The heat exchanger 76 has a configuration in which a part of the circulation pipe 78 passes and a part of a hot water storage tank pipe 84 that circulates in the hot water storage tank 32 mounted on the hot water storage unit 12 of the ENE-FARM 10 passes. I have.

  In this heat exchanger 76, heat exchange is performed in which heat of the hot water flowing through the hot water storage tank piping 84 is transferred to water flowing through the circulation piping 78 of the floor heating device 70.

  The heat exchange by the heat exchanger 76 is positioned as a sub heat exchange while the heat received from the combustion heating section 72 is a main heat exchange.

  The controller 16 recognizes the gas consumption restriction time for avoiding the continuation of the trace leakage monitoring function by the microcomputer gas meter 50, and stops the combustion of the burner 72A in the combustion heating unit 72 during the period.

  In the conventional floor heating device 70, when the main heat exchange in the combustion heating unit 72 is stopped, there is no means for heating the water flowing through the heat radiating pipe 74A and the circulation pipe 78. Have been inconvenienced, such as giving up the use of floor heating during suspension or using another heating facility.

  Therefore, in the present embodiment, although the power generation by the fuel cell unit 14 is stopped due to the gas consumption limitation in the ENE-FARM 10, the temperature of the hot water in the hot water storage tank 32 of the hot water storage unit 12 is secured to some extent. Attention was paid, and a part thereof was used as a heat source for heat exchange in the floor heating device 70.

  In the heat exchanger 76, the pump 76A is driven while the main heat exchange is stopped, and the hot water in the hot water storage tank 32 is circulated through the hot water storage tank piping 84. The water in the circulation pipe 78 is heated by receiving the heat from the hot water storage tank pipe 84, and the floor heating is continued by radiating the heat from the heat radiation pipe 74A.

  FIG. 4 shows the difference in control temperature between the case where the floor heating is stopped as in the related art (referred to as the conventional example) and the case where the floor heating is performed by the sub heat exchange (referred to as the present embodiment) during the gas consumption restriction period. FIG.

  A chain line A shown in FIG. 4 is a control temperature, and when the floor heating by the main heat exchange is performed, the control temperature is almost maintained.

  In the conventional example, as shown by a dotted line B in FIG. 4, the temperature decreases from the control temperature by the temperature h2 at the start of the gas consumption restriction, and then gradually decreases at the gradient θ2.

  On the other hand, in the present embodiment, as shown by the solid line C in FIG. 4, the control temperature decreases by the temperature h1 at the start of the gas consumption limit, and then gradually decreases at the inclination θ1, compared with the conventional example. The temperature drop is small and the slope is small.

  Therefore, the continuation of the floor heating control by the sub heat exchange is inferior to the floor heating control by the main heat exchange, but can suppress the temperature in the living room from rapidly dropping.

  The characteristic shown in FIG. 4 is an example, and it is sufficient that the floor heating capacity can be improved during the gas consumption restriction period rather than performing no heat exchange at all. It does not matter whether they are superior or inferior. For example, it is possible that the floor heating capacity by the auxiliary heat exchange has the ability to maintain the control temperature if the amount of hot water stored in the hot water storage tank 32 and the temperature of the hot water can be secured.

  The operation of the present embodiment will be described below with reference to the flowchart of FIG.

  FIG. 5 is a flowchart showing a heat exchange source switching control routine according to the present embodiment.

  In step 100, it is determined whether the gas consumption is being restricted.

  If a negative determination is made in step 100, it is determined that the gas consumption restriction has not been performed or the gas consumption restriction has been completed, and the process proceeds to step 102 to determine whether or not floor heating control is being performed by sub heat exchange. Is determined.

  If an affirmative determination is made in step 102, the process proceeds to step 104, where the floor heating control by the auxiliary heat exchange is terminated, and the process proceeds to step 106. If a negative determination is made in step 102, the process proceeds to step 106.

  In step 106, the set temperature in the living room is read out, and then the process proceeds to step 108 to calculate the floor heating capacity by hot water. The floor heating capacity is to adjust the temperature of the hot water circulating in the circulation pipe 78, and the flow rate is constant in the present embodiment.

  In the next step 110, the amount of gas combustion in the combustion heating section 72 is adjusted based on the calculation result, heat exchange is performed (main heat exchange), and the routine proceeds to step 120.

  On the other hand, if an affirmative determination is made in step 100, it is determined that the gas consumption restriction period or the gas consumption restriction period has started, and the routine proceeds to step 112, where the set temperature in the living room is read, and then to step 114. The process proceeds to determine whether sub heat exchange is necessary.

  If an affirmative determination is made in step 114, the process proceeds to step 116, in which the hot water in the hot water storage tank 32 is circulated to perform heat exchange (sub heat exchange), and then proceeds to step 120.

  If a negative determination is made in step 114, the process proceeds to step 118, in which the floor heating control by the auxiliary heat exchange is stopped, and the process proceeds to step 120.

  That is, in the floor heating control by the sub heat exchange, the temperature does not become higher than the control temperature (if it is, it is expected that the temperature gradually decreases as shown in FIG. 4). Control or the like is unnecessary, and only the control as to whether or not circulation is performed. This does not deny the flow control.

  In step 120, it is determined whether or not an instruction to stop the floor heating operation has been issued. If a negative determination is made, the process returns to step 100, and the above steps are repeated.

  If an affirmative determination is made in step 120, the process proceeds to step 122 to execute an operation stop process, and this routine ends.

  As described above, in this embodiment, the hot water in the hot water storage tank 32 used as hot water can be used as a heat source for heat exchange of the floor heating device 70 only during the gas consumption restriction period. However, the heating by the floor heating device 70 can be continued.

  Although the temperature of the hot water is controlled for the purpose of hot water supply, the temperature in the hot water storage tank 32 becomes higher than normal (temperature control for hot water supply) when the gas consumption restriction period is approaching. It may be controlled. Thereby, even if the hot water in the hot water storage tank 32 is used as the heat source of the floor heating device 70, the temperature drop can be suppressed.

  In the present embodiment, ENE-FARM 10 (domestic fuel cell cogeneration system) is applied as a cogeneration device, but an eco-weil (domestic gas cogeneration system) may be used.

  Further, the present invention can be applied to a system having no hot water storage function but having a hot water storage tank (such as a latent heat recovery type gas water heater (ecojuze)).

  (Modification)

  In the present embodiment, hot water in a hot water storage tank 32 provided in a hot water storage unit 12 of a cogeneration system such as ENE-FARM 10 is used as a heat source for floor heating control by auxiliary heat exchange, and the heat exchanger 76 Heat exchange (sub heat exchange) with the water flowing through the circulation pipe 78 of the floor heating device 70, but in a house where a cogeneration system such as the ENE-FARM 10 is not installed (for example, a home heat pump water heater) In the case of (eco-cute) or the like, the following modifications (Modifications 1 and 2) can be applied as the heat source of the floor heating control by the auxiliary heat exchange.

  "Modification 1"

  FIG. 6 shows a floor heating device 86 according to a first modification of the present embodiment. Note that the same components as those of the present embodiment are denoted by the same reference numerals, and description of the configuration will be omitted.

  In the floor heating device 86 of the first modification, a pump 89 and an electric heater (electric heater, etc.) 90 are arranged in the middle of a heat exchange pipe 88 flowing in the heat exchanger 87. Electric heater 90 is supplied with electric power from commercial power supply 60 and generates heat when switch 91 is turned on. The heat generated by the electric heater 90 heats the fluid flowing through the heat exchange source pipe 88.

  In the heat exchanger 87, heat exchange (sub heat exchange) is performed between the heat exchange source pipe 88 and the circulation pipe 78 of the floor heating device 86, and during a period during which the combustion heating unit 72 cannot be used (gas consumption restriction period). However, floor heating can be continued.

  "Modification 2"

  FIG. 7 shows a floor heating device 92 according to a second modification of the present embodiment. Note that the same components as those of the present embodiment or Modification 1 are denoted by the same reference numerals, and description of the configuration will be omitted.

  The floor heating device 92 according to the second modification has a configuration in which the electric heater 90 is directly interposed in the circulation pipe 78 of the floor heating device 92. That is, the electric heater 90 itself functions as a heat exchange for the sub heat exchange according to the present embodiment, heating the water flowing through the circulation pipe 78 (sub heat exchange) is performed, and the combustion heating unit 72 cannot be used. Floor heating can be continued even during the period (gas consumption restriction period).

10 Residential fuel cell cogeneration system (Ene-Farm)
12 Hot water storage unit 12D Device to be controlled 14 Fuel cell unit 14D Device to be controlled 16 Controller (selection unit, switching control unit)
Reference Signs List 18 Gas supply pipe 18A Branch 18B Branch 18C Branch 18D Branch 18E Branch 18F Branch 20 Fuel processor 22 Stack 24 Power consumption device 28 Inverter 30 Heat exchanger 32 Hot water storage tank 33 Water pipe 34 CPU
36 RAM
38 ROM
40 I / O
42 Bus 44 Microcomputer 46 Remote control panel 48 House 49 Hot water supply equipment 50 Microcomputer gas meter 51 Thermistor 60 Commercial power supply 62 Switching unit 63 Smart meter 66 Gas consumption equipment 70 Floor heating device 72 Combustion heating unit (first heat exchange processing)
72A Burner 74 Floor heating panel 74A Radiation pipe 76 Heat exchanger (second heat exchange processing)
78 Circulation piping (Piping “First heat exchange treatment”)
80 pump 82 three-way valve 84 hot water storage tank piping (pipe section “second heat exchange processing”)

Claims (5)

First heat exchange processing for performing floor heating by performing heat exchange between a combustion heating unit using combustion gas as a heat source and a refrigerant for floor heating, and a heating element and floor heating using heat other than the combustion gas as a heat source. A pipe section that can be switched to any one of the heat exchange processes of the second heat exchange process for performing floor heating by performing heat exchange with the refrigerant for use,
A selecting unit that selects the first heat exchange process when the use of the combustion gas is possible, and selects the second heat exchange process when the use of the combustion gas is restricted;
A switching control unit that switches to the heat exchange process selected by the selection unit,
A heat exchange control device having:   The heat exchange control device according to claim 1, wherein the heating element is hot water stored in a hot water storage tank.   The hot water storage tank is a part of a cogeneration device provided with a power generation unit, and the hot water in the hot water storage tank is heated using heat generated at the time of power generation of the power generation unit. Item 3. The heat exchange control device according to Item 2.   Predict the time when the use of the combustion gas is restricted, and at the start time of the predicted period, the temperature and the amount of the hot water in the hot water storage tank are maximized within an allowable range, so that the hot water in the hot water storage tank is maximized. The heat exchange control device according to claim 2 or 3, wherein consumption is restricted.   The heating element is an electric heater provided in a dedicated pipe for the floor heating exclusively for the second heat exchange process, or an electric heater provided in advance for preventing freezing of piping equipment. The heat exchange control device according to claim 1, wherein