JP2014214635A - Cogeneration system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cogeneration system capable of efficiently producing heat by using an engine in a cogeneration system even in the case of a small amount of demand power.SOLUTION: In a thermoelectric conversion apparatus including a cogeneration system 1, a control element 50 for driving and controlling an engine 10 is provided separately from an auxiliary control element 13 which controls the cogeneration system 1. Therein, in the control element 50, a surplus power heater 14 contained in the cogeneration system 1 is driven and controlled. When the surplus power heater 14 is driven, the engine 10 is driven in order to produce power required for the surplus power heater 14, therefore, the control element 50 can drive and control the engine 10 indirectly and, even in the case of a small amount of demand power, waste heat produced in the engine can be properly used.

Description

  The present invention relates to a thermoelectric supply system including a cogeneration system that can generate electric power using the driving force of an engine and can recover and use exhaust heat generated when the engine is driven.

  A conventionally known cogeneration system includes an engine, a power generation element, and an exhaust heat recovery path. The engine is driven by fuel such as gas or gasoline, and the power generation element is driven by the driving force of the engine to generate power. In addition, the exhaust heat generated when the engine is driven is recovered by the exhaust heat recovery path section, and the exhaust heat is supplied to a heating element (such as a panel heater or a floor heater) disposed in the room or the like. is there. In order to keep the room temperature comfortable by the heating element, various efforts have been conventionally made (see, for example, Patent Documents 1 and 2).

  Patent Document 1 discloses an operation control mechanism in a cogeneration system incorporating a solar power generation device. Patent Document 1 describes that a problem occurs when a reverse power flow from the home (indoor) side to the commercial power source occurs during solar power generation. Due to the relationship between the solar power generation device and the amount of power used in the home, the amount of power generated by the solar power generation device is suppressed during reverse tide. And, it is considered that the actual amount of solar thermal power generation is smaller than the expected amount of solar thermal power generation, which causes problems such as the amount of power that can be sold is less than the predicted value (that is, less).

  Patent Document 2 proposes a technique for scheduling whether a user is at home or away using a HEMS (Home Energy Management System; hereinafter, abbreviated as HEMS if necessary). According to this technology, it is said that the maximum user merit (for example, power sale, indoor temperature management, etc.) can be obtained by appropriately controlling power sale, power storage and electric load by solar power generation.

JP 2012-1000039 A JP 2013-20488 A

  However, in the general cogeneration system described above, the amount of power required for the cogeneration system (that is, the amount of power consumed by the electrical load connected to the cogeneration system, the amount of power to be generated by the cogeneration system) Accordingly, the engine drive amount (rotation speed, operation time, etc.) of the cogeneration system is often determined accordingly. In this type of cogeneration system, electric power having a magnitude corresponding to the driving amount of the engine is produced, and therefore the engine driving amount is determined according to the required electric energy. In such a cogeneration system, when the amount of power required for the cogeneration system (referred to as demand power amount) is small, the engine drive amount is small accordingly, and it is difficult to obtain the necessary amount of heat only from engine exhaust heat. was there. In general, a heat supply element other than the engine (for example, a gas hot water heater or the like) is incorporated into a cogeneration system to compensate for a shortage of heat. However, when a heat supply device other than the engine is used in combination, there is a problem that it is difficult to reduce the price of the cogeneration system or the heat recovery efficiency from the heat supply device is deteriorated.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a thermoelectric supply system that can use an existing cogeneration system and can obtain a sufficient amount of heat even when the amount of power demand is small. And

The thermoelectric supply system of the present invention that solves the above problems includes an engine, a power generation element that is connected to the engine and generates electric power by the driving force of the engine, and an exhaust gas that is connected to the engine and recovers heat generated when the engine is driven. Heat recovery path, surplus power heater that is electrically connected to the power generation element and thermally connected to the exhaust heat recovery path, and drive control of the engine, the power generation element, and the surplus power heater The power generation element is electrically connectable to at least one electric load, and generates the amount of power corresponding to the amount of power demanded by the electric load by the power generation element. A cogeneration system for controlling the drive of the engine by the sub-control element,
A control element connected to the cogeneration system and capable of driving and controlling the surplus power heater;
A heating element disposed in a room and connected to the exhaust heat recovery path, and supplying heat from the exhaust heat recovery path to the room;
An indoor temperature measuring element that is disposed in the room and connected to the control element, measures an indoor temperature, and transmits an actual temperature signal corresponding to the measured indoor temperature to the control element;
An operation terminal connected to the control element and capable of inputting a set temperature by a user, and transmitting a set temperature signal corresponding to the set temperature input by the user to the control element;
When the room temperature is lower than the set temperature, the control element drives the surplus power heater to increase the demand power amount, thereby increasing the drive amount of the engine.

  According to the thermoelectric supply system of the present invention, the surplus power heater included in the cogeneration system is driven and controlled by the control element when heat is required even though electric power is not so much required. The surplus power heater is an element for preventing a reverse power flow from the cogeneration system to the commercial power source by converting surplus power generated in the cogeneration system into heat. A general cogeneration system includes a surplus power heater. The control element in the thermoelectric supply system of the present invention drives the surplus power heater even when surplus power is not generated. For this reason, even when the amount of power required is small and the amount of heat generated by the engine is small, the amount of power required by the surplus power heater is added to the demand power, and the engine drive amount increases. Therefore, the amount of heat generated in the engine increases. Moreover, if the surplus electric power heater supplies heat converted from electric power to the exhaust heat recovery path section, the amount of heat generated in the cogeneration system and supplied to the heating element further increases. That is, the control element in the thermoelectric supply system of the present invention indirectly controls the combustion of the engine. For this reason, even when the power demand is small and a sufficient amount of heat cannot be supplied by the engine conventionally, the exhaust heat can be appropriately used by the engine.

  According to the thermoelectric supply system of the present invention, the control element for driving and controlling the engine of the cogeneration system is provided separately from the sub-control element responsible for general driving control of the cogeneration system. The engine of the cogeneration system (that is, a general-purpose type) can be driven and controlled without being limited by the drive control of the cogeneration system by the sub-control element, and the necessary amount of heat can be supplied to the heating element.

The thermoelectric supply system of the present invention preferably includes any one of the following (1) to (3), and more preferably includes a plurality of (1) to (3).
(1) A hot water supply apparatus connected to the exhaust heat recovery path section is provided, and the exhaust heat recovery path section can exchange heat with water supplied to the hot water supply apparatus.
(2) Further, a path that is disposed in the exhaust heat recovery path and connected to the control element, measures the temperature of the exhaust heat recovery path and measures the measured temperature of the exhaust heat recovery path A path temperature measurement element is provided that transmits a temperature signal to the control element.
(3) The exhaust heat recovery path section includes a coolant, and the path temperature measurement element measures the temperature of the coolant flowing through the heating element.

  According to the thermoelectric supply system of the present invention, heat can be efficiently generated using the engine in the cogeneration system even when the demand power is small.

It is explanatory drawing which represents the thermoelectric supply system of embodiment typically. It is a flowchart which represents typically the control mechanism of the thermoelectric supply system of embodiment.

  The thermoelectric supply system of the present invention includes a cogeneration system, a control element, a heating element, a room temperature sensor, and an operation terminal.

  As the cogeneration system, the existing general-purpose type described above may be used. That is, the cogeneration system in the thermoelectric supply system of the present invention only needs to include an engine, a power generation element, an exhaust heat recovery path, and a surplus power heater. The type of engine is not particularly limited, but it is preferable to select an engine that is driven by general fuel such as gas, gasoline, or kerosene. The power generation element is also not particularly limited, and various elements that can generate power by the driving force of the engine can be used. The exhaust heat recovery path section only needs to be able to recover the exhaust heat of the engine and the heat of the surplus electric power heater and supply the heat to the heating element. The exhaust heat recovery path section is directly or indirectly connected to the engine and constitutes a path connecting the engine, the surplus power heater and the heating element. The exhaust heat recovery path section may transfer heat by any mechanism. However, in order to perform heat transfer appropriately, the exhaust heat recovery path section is composed of a fluid and a fluid flow path through which the fluid flows. It is good. More preferably, the fluid flow path portion has a circuit shape for supplying exhaust heat of the engine to the heating element and supplying again the fluid after heat transfer through the heating element to the engine.

  The surplus power heater is electrically connected to the power generation element, and is thermally connected to the exhaust heat recovery path section, operates by receiving power from the power generation element, and generates heat to the exhaust heat recovery path section. Any supply is acceptable. Of course, the surplus power heater in the thermoelectric supply system of the present invention may be further electrically connected to a commercial power source, similarly to the surplus power heater in the existing cogeneration system. Further, for example, a surplus power heater is thermally connected to an element that can temporarily store heat (for example, a fluid in a hot water storage tank) or an element that can use heat (for example, a fluid that circulates in a water heater). When surplus power is generated without using the heating elements, heat may be supplied to these elements.

  The control element is connected to the room temperature measurement element and the operation terminal, and sets the room temperature based on the room temperature (actual value) measured by the room temperature measurement element and the set temperature input by the user to the operation terminal. The engine is driven and controlled to approach the temperature. Specifically, as described above, the amount of demand electric power is raised by driving and controlling the surplus electric power heater, and the engine is driven with a magnitude based on the raised amount of electric power demand to obtain the required amount of engine exhaust heat. . The control element only needs to be able to perform such control, and a general device control element can be used.

  In addition, you may make the control element in the thermoelectric supply system of this invention bear the control function in the conventional cogeneration system. In other words, in this case, the control element controls the cogeneration system including the engine as usual, and the system that controls the combustion of the engine to obtain the amount of heat that exceeds the amount of exhaust heat produced by the conventional cogeneration system (that is, And the control element in the present invention).

  According to the thermoelectric supply system of the present invention, heat supply elements other than the cogeneration system (for example, a gas hot water heater) can be abolished, so that the cost required for the heating equipment can be reduced and the heat loss in the entire heat supply element can be reduced. it can.

  The heating element only needs to be capable of receiving direct or indirect supply of exhaust heat generated by the engine and heating the interior of the room. For example, the drive source supplies exhaust heat to the heating element in the state of hot water. In some cases, the heating element can be embodied as a floor heater device. The heating element is not limited to this and may be a panel heater or the like.

(Embodiment)
Hereinafter, the thermoelectric supply system of the present invention will be described with specific examples.

  The thermoelectric supply system of the embodiment is an example of the thermoelectric supply system of the present invention, and is disposed in a building. In addition, although the building in embodiment is a building, the thermoelectric supply system of this invention should just be able to heat an interior, and can also be arrange | positioned in buildings other than a building, such as a bridge and a tower. An explanatory view schematically showing the thermoelectric supply system of the embodiment is shown in FIG. 1, and a flowchart schematically showing a control mechanism of the thermoelectric supply system of the embodiment is shown in FIG.

  As shown in FIG. 1, the thermoelectric supply system of the embodiment includes a cogeneration system 1, a control element 50, a floor heater 51, an indoor temperature measurement element 52, an operation terminal 53, a solar water heater 60, and a gas water heater 70. . As will be described later, the thermoelectric supply system of the embodiment is connected to various electric loads 90 and can supply electric power.

  The cogeneration system 1 (hereinafter abbreviated as “cogeneration” as necessary) includes a gas engine 10, an electromagnetic induction generator 11, an electric path section 12, an exhaust heat recovery path section 20, a sub control element 13, and a surplus power heater 14. Prepare.

  The gas engine 10 corresponds to an engine in the thermoelectric supply system of the present invention. The gas engine 10 is disposed in a cogeneration building 91 disposed outdoors. The gas engine 10 is an engine that is driven by using city gas or propane gas as fuel, and may be selected from those commonly used for cogeneration. The electromagnetic induction generator 11 corresponds to a power generation element in the thermoelectric supply system of the present invention.

  The electromagnetic induction generator 11 is connected to the gas engine 10 and is driven by the driving force of the gas engine 10 to generate power. An electrical path unit 12 is connected to the electromagnetic induction generator 11. The electrical path unit 12 includes an AC-DC booster 12a, a DC-AC converter 12b, and an interconnection box 12c. Specifically, an AC-DC booster 12a is connected to the electromagnetic induction generator 11, and a DC-AC converter 12b is connected to the AC-DC booster 12a. Therefore, the electric power generated by the electromagnetic induction generator 11 is converted from alternating current (AC) to direct current (DC) by the AC-DC booster 12a, and further converted into an AC single-phase three-wire 200V / 100V by the DC-AC converter 12b. Converted. The DC-AC converter 12b is connected to the commercial power source 92 via the interconnection box 12c. Various electric loads 90 (lights or the like) are further connected to the interconnection box 12 c, and the electric power generated by the cogeneration can be used by these electric loads 90.

  The exhaust heat recovery path part 20 includes coolants 20a and 20b and a fluid flow path part 20c through which the coolants 20a and 20b flow. The coolants 20a and 20b are not particularly limited, and known ones can be used. The coolants 20a and 20b may be water. The fluid flow path section 20c includes a first path section 20d that exchanges heat with the gas engine 10 and the surplus power heater 14, a second path section 20e that exchanges heat with the first path section 20d, a first path section 20d, and a second path section. It includes a heat exchanger 20f responsible for heat exchange of the path portion 20e, and a hot water storage tank 20g connected to the first path portion 20d. In the thermoelectric supply system of the embodiment, the sub control element 13 is integrated with the control element 50. The sub-control element 13 performs drive control of the gas engine 10, the electromagnetic induction generator 11, and the surplus power heater 14 based on a general cogeneration control mechanism. That is, the sub-control element 13 determines the driving amount of the gas engine 10 according to the electric power required by the various electric loads 90, that is, the magnitude of the demand electric power, and generates electric power with the electromagnetic induction generator 11, 90 is supplied with power. Further, when the amount of power produced by the electromagnetic induction generator 11 temporarily becomes excessive, that is, when surplus power is generated, surplus power is supplied to the surplus power heater 14 and converted into heat.

  The first path portion 20 d includes a first flow path 21 that circulates inside the gas engine 10, a second flow path 22 that communicates with the first flow path 21 and flows in the vicinity of the surplus power heater 14, and a second flow path 22. A third flow path 23 that communicates with the first hot water storage tank 20g, a first bypass 31 that bypasses the third flow path 23 between the upstream side and the downstream side of the first hot water storage tank 20g, And a fourth flow path 24 that communicates with the third flow path 23 and the first flow path 21 and circulates inside the heat exchanger 20f. A first pump 34 is attached to the fourth flow path 24 at a position between the gas engine 10 and the heat exchanger 20f. A first valve 38 is attached to the boundary between the third flow path 23, the first bypass 31 and the second flow path 22. The coolant 20a flows in the first path portion 20d, and the coolant 20b flows in the second path portion 20e. The coolant 20a flowing through the first path portion 20d is as follows: first flow path 21 → second flow path 22 → third flow path 23 (or first bypass 31) → fourth flow path 24 → first flow path 21. It circulates in the order.

  The second path portion 20e is connected to the sixth flow path 26 that circulates inside the heat exchanger 20f, the seventh flow path 27 that communicates with the sixth flow path 26 and circulates inside the gas water heater 70 described later, An eighth flow path 28 that communicates with the seventh flow path 27 and flows through the interior of the floor heater 51 described later, and a ninth flow path 29 that communicates with the eighth flow path 28 and communicates with the sixth flow path 26. And a second bypass 32 that communicates with the ninth flow path 29 and the sixth flow path 26 and circulates in the hot water storage hot water storage tank 20h described later. A second valve 39 is attached to the boundary between the sixth flow path 26, the second bypass 32 and the seventh flow path 27. A second pump 35 is attached to the ninth flow path 29 at a position between the second bypass 32 and the heat exchanger 20f. When the room temperature is low and it is necessary to supply heat to the floor heater 51, the second valve 39 connects the sixth flow path 26 and the seventh flow path 27 and shuts off the second bypass 32. In this case, the coolant 20b flowing through the second path portion 20e flows in the order of the sixth flow path 26 → the seventh flow path 27 → the eighth flow path 28 → the ninth flow path 29 → the sixth flow path 26. Circulate. When the room temperature is sufficiently high and it is not necessary to supply heat to the floor heater 51, the second valve 39 connects the sixth flow path 26 and the second bypass 32, and the seventh flow path 27 The flow path leading to the eight flow paths 28 is blocked. In this case, the coolant 20b flowing through the second path portion 20e circulates in the order of the sixth flow path 26 → the second bypass 32 → the ninth flow path 29 → the sixth flow path 26. That is, at this time, the coolant 20b flowing through the second path portion 20e does not pass through the gas water heater 70 and the floor heater 51.

  The surplus power heater 14 is a general electric heater, and is connected to the DC-AC converter 12b. The electric system of the solar water heater 60 is connected to the DC-AC converter 12b. Specifically, the solar water heater 60 includes a solar cell panel 61, a converter 62, a hot water storage hot water tank 20 h and a hot water supply channel 63. The solar cell panel 61 is disposed on the roof of the building 95 (building) and generates power by sunlight. A converter 62 is connected to the solar cell panel 61, and the converter 62 is connected to the DC-AC converter 12b. Further, a control element 50 is also connected to the converter 62. In the embodiment, the electric power generated by the solar cell panel 61 using sunlight is supplied to the surplus power heater 14 and converted into heat as necessary. And this heat is supplied to the coolant 20a in the 1st channel | path part 20d.

  The hot water storage hot water storage tank 20h is connected to a water supply (not shown). That is, tap water is stored in the hot water storage hot water tank 20h. The hot water storage tank 20h is connected to the hot water supply passage 63, and the tap water stored in the hot water storage tank 20h circulates in the hot water supply passage 63. The hot water storage tank 20h is connected to the second bypass 32 of the second path portion 20e, and the tap water in the hot water storage tank 20h is warmed by heat exchange with the coolant 20b flowing through the second path portion 20e. . The warmed tap water is drawn into the room of the building 95 through the hot water supply flow path 63 and supplied to the user. In the embodiment, the hot water supply channel 63 is connected to the gas water heater 70. The gas water heater 70 corresponds to the hot water supply apparatus in the present invention. The gas water heater 70 includes an unillustrated heat source (gas burner) and can heat tap water in the hot water supply flow path 63. In the embodiment, the gas water heater 70 is disposed indoors and can be driven by a user.

  The indoor temperature measuring element 52 is a thermometer disposed indoors, and is connected to the control element 50 by wire or wirelessly. The room temperature measurement element 52 transmits an actual temperature signal corresponding to the measured room temperature to the control element 50.

  The operation terminal 53 is disposed indoors and connected to the control element 50 by wire or wirelessly. The operation terminal 53 can receive a set temperature by the user, can transmit a set temperature signal based on the set temperature to the control element 50, and can display the room temperature measured by the room temperature measuring element 52.

  The control element 50 in the thermoelectric supply system of the embodiment only performs drive control of the surplus power heater 14 and the gas engine 10, and drive control of the cogeneration system 1 itself is performed by the sub-control element 13. That is, the thermoelectric supply system of the embodiment can incorporate the existing cogeneration system 1 as it is. In addition, in the thermoelectric supply system of the embodiment, a part of the control element 50 constitutes the sub control element 13, but the control element 50 and the sub control element 13 may be physically separated.

  The control element 50 can be controlled in at least two ways so that the gas engine 10 has a rated output (power) or a maximum output (power). The surplus power heater 14 can be controlled in at least three ways so as to output the rated output (heat amount), the maximum output (heat amount), or the flow output described later. When the maximum output control of the gas engine 10 and the maximum output control of the surplus power heater 14 are performed, the amount of heat generated in the gas engine 10 is maximized. In the embodiment, the maximum output value of the surplus power heater 14 is determined in advance so that the amount of heat generated in the gas engine 10 is sufficient for the amount of heat required by the floor heater 51 regardless of the amount of power demand. Yes. In other words, the maximum output value of the surplus power heater 14 is produced by the gas engine 10 by consuming the shortage of power supplied to the gas engine 10 by the surplus power heater 14 regardless of the amount of power demand. It is determined in advance that the amount of heat is sufficient for the amount of heat required by the floor heater 51. In addition, when supplying the heat of the surplus power heater 14 to the floor heater 51, the sum of the heat amount generated by the gas engine 10 and the heat amount generated by the surplus power heater 14 becomes the heat amount required by the floor heater 51. It is sufficient that the maximum output value of the surplus power heater 14 is determined in advance. Further, when the heat of the surplus power heater 14 is used for purposes other than the floor heater 51, the maximum output value of the surplus power heater 14 is sufficient so that the amount of heat produced by the gas engine 10 is sufficient for the amount of heat required by the floor heater 51. May be determined in advance.

  By appropriately combining the output control of the gas engine 10 and the output control of the surplus power heater 14, the amount of heat produced by the cogeneration can be adjusted in multiple stages.

  The floor heater 51 corresponds to a heating element in the thermoelectric supply system of the present invention. Inside the floor heater 51, the 8th flow path 28 which is a part of the waste heat recovery path | route part 20 is incorporated. In the eighth flow path 28, the same coolant 20b as the exhaust heat recovery path portion 20 (more specifically, the second path portion 20e) flows.

  Hereinafter, the operation of the thermoelectric supply system of the embodiment will be described.

  In the embodiment, operation control of the gas engine 10 and the surplus power heater 14 is performed in the following three cases. Specifically, [1] When the room temperature is lower than (set temperature -2 ° C), [2] The room temperature is lower than the set temperature, but the difference between the room temperature and the set temperature is 2 ° C or less. In some cases, [3] the room temperature is higher than (set temperature + 2 ° C.).

  Hereinafter, Step 1 is abbreviated as S1. The same applies to step 2 and subsequent steps. Moreover, the evaluation (Yes or No) in each step is abbreviated as Y and N, respectively.

  As shown in FIG. 2, the control element 50 in the thermoelectric supply system of the embodiment first determines whether or not the cogeneration is in operation (S1). If the cogeneration is not in operation (S1 is Y), the room temperature measured by the room temperature measurement element 52 is compared with the set temperature preset by the user at the operation terminal 53, and the room temperature is less than the set temperature. It is determined whether or not (S2). If the room temperature is less than the set temperature (S2 is N), a cogeneration stop instruction (more specifically, a drive stop instruction for the gas engine 10) is issued. At this time, the control element 50 starts counting down and returns to S1 again after a predetermined time has elapsed.

  If the cogeneration is in operation (S1 is Y), the room temperature is compared with the set temperature, and it is determined whether (room temperature + 2 ° C.) is less than the set temperature (S3). That is, in S3, it is determined whether or not the relationship between the room temperature and the set temperature applies to the above [1]. When (room temperature + 2 ° C.) is less than the set temperature (Y in S3), the room temperature is low, and it is necessary to heat the room by the floor heater 51, so the combustion drive of the gas engine 10 is instructed. Specifically, the maximum output of the gas engine 10 is controlled by controlling the surplus power heater 14 to the maximum output. Since the heat of the surplus power heater 14 is recovered by the exhaust heat recovery path section 20, the amount of heat obtained by cogeneration at this time is the sum of the amount of heat generated by the gas engine 10 and the amount of heat generated by the surplus power heater 14. At this time, the surplus power heater 14 consumes power sufficient to compensate for the difference between the maximum output value (electric power) of the gas engine 10 and the demand power amount of the cogeneration. That is, the maximum output value of the surplus power heater 14 in the embodiment is a heat amount corresponding to the power for the supplement. After the above control, the control element 50 starts counting down, and returns to S3 again after a predetermined time.

  On the other hand, if S3 is N, that is, if the difference between the room temperature and the set temperature is 2 ° C. or less, it is determined whether the room temperature is less than the set temperature (S4). That is, in S4, it is determined whether or not the relationship between the room temperature and the set temperature applies to the above [2]. When S4 is Y, that is, the room temperature is lower than the set temperature, but the difference between the room temperature and the set temperature is 2 ° C. or less, the room temperature is low and the floor heater 51 heats the room. Although it is necessary, since it is not necessary to heat as rapidly as in the case of [1], the combustion drive of the gas engine 10 is instructed so that the amount of heat supplied to the floor heater 51 is smaller than in the case of [1]. To do. Specifically, the rated output control of the gas engine 10 is performed by controlling the surplus power heater 14 at the rated output. Also at this time, the amount of heat obtained by cogeneration is the sum of the amount of heat produced by the gas engine 10 and the amount of heat produced by the surplus power heater 14. At this time, the surplus power heater 14 consumes power sufficient to compensate for the difference between the rated output value (power) of the gas engine 10 and the demand power amount of the cogeneration. That is, the rated output value of the surplus power heater 14 in the embodiment is a heat amount corresponding to the power for the supplement. After the above control, the control element 50 starts counting down, and returns to S3 again after a predetermined time.

  Furthermore, when S4 is N, that is, when the room temperature is equal to or higher than the set temperature, the room temperature is sufficiently high. At this time, it is determined whether or not the room temperature is excessively high (S5). That is, in S5, it is determined whether the relationship between the room temperature and the set temperature satisfies the above [3].

  When S5 is N, that is, the room temperature is higher than the set temperature, but the difference between the room temperature and the set temperature is 2 ° C. or less, the drive control of the surplus power heater 14 by the control element 50 (that is, the gas engine) 10 drive control) is interrupted. Therefore, at this time, only normal cogeneration operation control by the sub-control element 13 is performed. Specifically, the gas engine 10 is driven so as to have a power generation amount corresponding to the power demand amount, the surplus power heater 14 is stopped, and the heat amount obtained by cogeneration becomes equal to the engine exhaust heat amount. After the above control, the control element 50 starts counting down, and returns to S3 again after a predetermined time.

  On the other hand, when S5 is Y, that is, when the room temperature is excessively high, the sub-control element 13 stops the gas engine 10 and only the operation of the first pump 34 and the second pump 35 is continued. That is, at this time, the amount of heat supplied to the floor heater 51 gradually decreases. Thereafter, the control element 50 starts a countdown, and performs the following S6 after a predetermined time has elapsed.

  In S6, it is determined whether or not the temperature of the coolant 20b is less than 35 ° C. Specifically, the path temperature measuring element 55 was attached to the eighth flow path 28, and the temperature (path temperature) of the coolant 20b inside the floor heater 51 was measured. Similarly to the indoor temperature measuring element 52, the path temperature measuring element 55 is connected to the control element 50 and can transmit a path actual temperature signal based on the path temperature. Therefore, the control element 50 determines whether or not the temperature of the coolant 20b is less than 35 ° C. based on the path actual temperature signal transmitted by the path temperature measuring element 55. When S6 is N, that is, when the temperature of the coolant 20b is 35 ° C. or higher, the gas engine 10 is stopped by the sub-control element 13 as in the case where S5 is Y, and the first pump 34 and the first pump 34 2 Only the operation of the pump 35 is continued. Thereafter, the control element 50 starts counting down, and performs S6 again after a predetermined time has elapsed.

  On the other hand, when S6 is Y, that is, when the temperature of the coolant 20b is lower than 35 ° C., it is considered that the amount of heat supplied to the floor heater 51 is not so large and the temperature of the coolant 20b gradually decreases. Therefore, there is not much advantage in circulating the coolant 20b at this stage. Therefore, in this case, the operation of the first pump 34 and the second pump 35 is stopped by the sub control element 13. At this time, the temperature of the coolant 20b gradually decreases, and the room temperature may also gradually decrease. For this reason, in preparation for the case where it is necessary to supply the warm coolant 20b to the floor heater 51, the control element 50 starts counting down and returns to S1 after a predetermined time has elapsed.

  According to the thermoelectric supply system of the embodiment, the surplus power heater 14 is driven and controlled by the control element 50, and the drive control of the gas engine 10 is indirectly performed. Even when drive control of the gas engine 10 is performed, the gas engine 10 can produce a desired amount of heat. That is, according to the thermoelectric supply system of the embodiment, the room temperature can be controlled as desired while using the existing cogeneration. For this reason, a heat supply device (such as a gas hot water heater) for assisting cogeneration and supplying heating heat to the room is not required, and a thermoelectric supply system can be provided at a relatively low cost.

  Further, according to the thermoelectric supply system of the embodiment, the gas engine 10 can be driven on-time according to the room temperature measured by the room temperature measuring element 52 disposed in the room, and heat can be produced. For this reason, the room temperature can be easily kept constant.

Further, in the control element 50, the drive control of the gas engine 10, that is, the temperature control of the floor heater 51 is performed based on the room temperature. Therefore, the temperature control according to the room temperature that the user actually desires, that is, the set temperature is easily performed. obtain. Furthermore, by measuring the temperature of the exhaust heat recovery path section 20 (in the embodiment, the temperature of the coolant 20b in the floor heater 51) by the path temperature measuring element 55, and controlling the operation of the cogeneration based on this measured value. Fine indoor temperature control is possible.
(Others) The present invention is not limited to the embodiment described above and shown in the drawings, and can be implemented with appropriate modifications within a range not departing from the gist.

DESCRIPTION OF SYMBOLS 1: Cogeneration system 10: Engine 11: Electric power generation element 13: Sub control element 14: Surplus electric power heater 20: Exhaust heat recovery path part 20a, 20b: Coolant 50: Control element 51: Heating element 52: Indoor temperature measurement element 53: Operation terminal 55: Path temperature measuring element 70: Hot water supply device 90: Electric load

Claims (4)

An engine, a power generation element that is connected to the engine and generates electric power by the driving force of the engine, an exhaust heat recovery path that is connected to the engine and recovers heat generated when the engine is driven, and the power generation element electrically A surplus power heater that is connected and thermally connected to the exhaust heat recovery path, and a sub-control element that performs drive control of the engine, the power generation element, and the surplus power heater, and the power generation element Is electrically connectable to at least one electric load, and the sub-control element controls the drive of the engine so that the power generation element generates the amount of power corresponding to the amount of power consumed by the electric load. Cogeneration system to perform,
A control element connected to the cogeneration system and capable of driving and controlling the surplus power heater;
A heating element disposed in a room and connected to the exhaust heat recovery path, and supplying heat from the exhaust heat recovery path to the room;
An indoor temperature measuring element that is disposed in the room and connected to the control element, measures an indoor temperature, and transmits an actual temperature signal corresponding to the measured indoor temperature to the control element;
An operation terminal connected to the control element and capable of inputting a set temperature by a user, and transmitting a set temperature signal corresponding to the set temperature input by the user to the control element;
When the room temperature is lower than the set temperature, the control element drives the surplus power heater to increase the demand power amount, thereby increasing the engine drive amount.   2. The thermoelectric supply system according to claim 1, further comprising a hot water supply device connected to the exhaust heat recovery path unit, wherein the exhaust heat recovery path unit is capable of heat exchange with water supplied to the hot water supply device.   Further, the exhaust heat recovery path is disposed in the exhaust heat recovery path and connected to the control element, and measures a temperature of the exhaust heat recovery path and measures a path temperature signal corresponding to the measured temperature of the exhaust heat recovery path. The thermoelectric supply system according to claim 1, further comprising a path temperature measurement element that transmits to the control element.   The thermoelectric supply system according to claim 3, wherein the exhaust heat recovery path section includes a coolant, and the path temperature measurement element measures the temperature of the coolant flowing through the heating element.

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