JP2014142116A - Cogeneration system and heating equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve heat efficiency of an entire system in a cogeneration system with a heat source machine heating a heat medium circulating to a heating radiator being provided in parallel with a main body and heating equipment with the cogeneration system.SOLUTION: A cogeneration system includes a communication unit 96 communicating with a heat source machine 10. A main-body-side control unit 95 receives target-temperature related information on a target temperature with respect to a discharge temperature of a heat medium H discharged from a heat-source-machine-side heat medium discharge portion 16b in a heating operation via the communication unit 96, and executes a hot-water circulating state control for controlling a hot water circulating state on the basis of the target-temperature related information.

Description

The present invention heats the heating medium received from the heat source unit side heat medium receiving unit to a preset heating heating medium temperature, discharges the heated heating medium from the heat source unit side heating medium discharge unit, and circulates for heating A heat and power supply unit that generates electric power and heat, and is installed in a heat source machine capable of performing a heating operation leading to a heating radiator on a road;
A hot water storage tank for storing hot water heated by the heat generated in the combined heat and power supply unit, and hot water are circulated to an exhaust heat recovery heat exchanger that recovers heat generated in the combined heat and power supply unit, and stored in the hot water storage tank. A main body side connected to the heat source side heat medium receiving section from a main body side heat medium receiving section that receives the heat medium after passing through the heating radiator in the hot water circulation path to be circulated and the heating circulation path Heating heat that exchanges heat between the heat medium flow path through which the heat medium flows, the hot water flowing through the hot water circulation path, and the heat medium flowing through the heat medium flow path up to the heat medium discharge section. The present invention relates to a cogeneration system including a exchanger and a main body side control unit that controls operation, and a heating facility.

A cogeneration system usually includes a heat generator combined with a power generator driven by a gas engine, a fuel cell, etc., and uses heat generated when power is generated by the heat generator. The hot water is heated, and the heated hot water is stored in a hot water storage tank.
As one form of such a cogeneration system, there is known one in which a heat source device that heats a heating medium circulating through a heating medium circulation path to a heating radiator is also provided (see Patent Document 1).
In the technology described in Patent Document 1, in the cogeneration system, a hot water circulation path that circulates hot water that can be heated by heat generated by the combined heat and power supply device and can be stored in the hot water storage tank is provided. An exhaust heat heating heat exchanger that heats the heat medium circulating in the heat medium circulation path with the heat of the hot water circulating in the hot water circulation path (“heating heat exchanger 11” in Patent Document 1) is provided.
As a result, the heat generated in the cogeneration system can be supplied to the heating radiator on the heat source unit side of the cogeneration system.

JP 2006-29745 A

In the cogeneration system as described above, from the viewpoint of improving thermal efficiency, based on information on the heating load (heating target temperature, etc.) of the heating operation, the circulation state of hot water circulating in the hot water circulation flow path, It is preferable that the respective operation states on the cogeneration system side and the heat source unit side are controlled so as to adjust the heating state of the heat medium.
However, as in the technique disclosed in the above cited document 1, in the type in which the heat source machine is provided in the main body of the cogeneration system, the main body and the heat source machine are provided separately. In particular, the operation state on the main body side of the cogeneration system has not been configured to be actively controlled based on information on the heating load (heating target temperature, etc.) in the heating operation. Thereby, for example, excessive heat is given to the heat medium on the main body side, and the discharge temperature of the heat medium from the heat source machine may exceed the target temperature. In such a case, the user intended Although temperature adjustment cannot be performed and there is a possibility that the temperature cannot be lowered although it is desired to lower the room temperature or the floor temperature, there is a problem in terms of comfort. This also has a problem that the thermal efficiency is lowered.

  The present invention has been made paying attention to such a point, and an object thereof is to provide a cogeneration system in which a heat source device for heating a heat medium circulated to a heating radiator is provided in the main body, and the cogeneration system. It is in the point which improves the thermal efficiency as the whole system in a heating installation.

In order to achieve the above object, the cogeneration system of the present invention comprises:
The heat medium received from the heat source unit side heat medium receiving part is heated to a preset heating air heating medium temperature, and the heated heat medium is discharged from the heat source unit side heat medium discharge part and heated in the heating circulation path. It is attached to the heat source machine that can perform the heating operation leading to the radiator,
A cogeneration unit that generates electric power and heat;
A hot water storage tank for storing hot water heated by heat generated in the combined heat and power unit;
Circulating hot water to an exhaust heat recovery heat exchanger that recovers the heat generated in the combined heat and power supply section, and circulating the hot water to the hot water storage tank;
In the heating circuit, between the main body side heat medium receiving part that receives the heat medium after passing through the heating radiator and the main body side heat medium receiving part connected to the heat source unit side heat medium receiving part. A heat medium flow path through which the heat medium flows,
A heat exchanger for heating that exchanges heat between the hot water flowing through the hot water circulation path and the heat medium flowing through the heat medium flow path;
It is a cogeneration system with a main body side control unit that controls operation, and its characteristic configuration is
A communication unit communicating with the heat source unit;
The main body side control unit receives the target temperature related information related to the target temperature of the discharge temperature of the heat medium discharged from the heat source unit side heat medium discharge unit in the heating operation via the communication unit, and the target temperature The hot water circulation state control for controlling the hot water circulation state for circulating hot water through the heating heat exchanger of the hot water circulation path based on the related information is performed.

According to the above characteristic configuration, the main body side of the cogeneration system positively receives the target temperature related information related to the target temperature of the heating operation from the heat source device side via the communication unit, and receives the received target temperature related information. Based on the hot water circulation state on the main body side, the hot water circulation state includes not only simple ON / OFF information of the heating operation but also the target temperature of the heating operation. Can be controlled.
For example, when it can be determined from the target temperature related information of the heating operation that a relatively large amount of heat is necessary (the heating load is high), the hot water circulation flow rate flowing through the heating heat exchanger is increased, and the heating heat exchange is performed. By supplying a large amount of heat to the heat medium with the vessel, the heating of the heat medium in the heat source device can be reduced, and the consumption of fuel can be reduced by the reduction of the heating.
On the other hand, when it can be determined from the target temperature related information of the heating operation that relatively little heat is required (heating load is low), the hot water circulation flow rate through the heating heat exchanger is reduced, and the temperature of the heat medium is set. It is possible to prevent the heating medium having a temperature exceeding the target temperature from being led to the heating radiator, prevent the room temperature and the floor temperature from rising more than necessary, and improve comfort.
Moreover, the part which reduced the hot water circulation flow rate which flows through the heat exchanger for heating is stored in a hot water storage tank, and energy can be improved by supplying the heat to the subsequent heat demand.
As described above, according to the present invention, the heat efficiency of the entire system can be improved in the case where the main body of the cogeneration system is provided with the heat source device for heating the heat medium circulated to the heating radiator.
In the present application, unless otherwise specified, the combined heat and power supply unit is in an operating state, heat recovery by hot water is performed in the exhaust heat recovery heat exchanger, and passes through the exhaust heat recovery heat exchanger. It is assumed that the temperature of the subsequent hot water is maintained at the hot water storage target temperature.

A further characteristic configuration of the cogeneration system according to the present invention is as follows.
The heating circulation path is provided with a main body side heat medium flow path that guides the entire amount of the circulating heat medium to the heating heat exchanger on the main body side.

According to the above characteristic configuration, since the entire amount of the circulating heat medium is guided to the heating heat exchanger on the main body side, the heat medium is moved to the heating heat exchanger side with a simple configuration. Can lead.
Hereinafter, the operation control according to the present application in the case of adopting the configuration will be described. In the operation control in the configuration, the heat medium guided to the heating heat exchanger is hot water flowing through the heating circulation path. Is the total amount. And since the flow volume is determined by the heating load (the number of operating and the types of heating radiators, etc.), it cannot be controlled by the main body side control unit. For this reason, in the following operation control, the heat medium flow state control for controlling the flow rate of the heat medium guided to the heating heat exchanger on the main body side is not executed, and only the hot water circulation state control is executed. Become.

A further characteristic configuration of the cogeneration system according to the present invention is as follows.
The heating circulation path is provided with a main body side heat medium flow path that takes out a predetermined flow rate from the circulating heat medium and returns it to the circulating heat medium after being guided to the heating heat exchanger on the main body side.

Usually, the flow rate of the heat medium flowing through the heating circuit is determined by the heating load (the number of operating and types of heating radiators) in the heating radiator connected to the heating circuit. Therefore, if the total flow rate of the heat medium is guided to the heating heat exchanger side, the flow rate of the heat medium flowing through the heating heat exchanger cannot be adjusted. As a result, the amount of heat recovered by the heating heat exchanger and the temperature of the heating medium at the outlet of the heating heat exchanger cannot be adjusted by controlling the flow rate of the heating medium.
According to the above characteristic configuration, since the main body side heat medium flow path for taking out the circulating heat medium and leading it to the heating heat exchanger side is provided, the flow rate of the heat medium to be passed to the heating heat exchanger Can be controlled.
As a result, the total flow rate of the heating medium flowing through the heating circulation path is maintained regardless of the circulating flow rate of the heating medium while maintaining the state controlled by the heating load (the number of operating heating radiators, etc.). The amount of heat recovered by the heating heat exchanger and the temperature of the heating medium at the outlet of the heating heat exchanger are determined by the heating medium passing through the main body side heating medium flow path. It can be adjusted by controlling the predetermined flow rate.

A further characteristic configuration of the cogeneration system according to the present invention is as follows.
Heat medium flow state control for fixing a flow rate of the heat medium that takes out a predetermined flow rate from the circulating heat medium and leads to the heating heat exchanger on the main body side to be equal to or higher than a total circulation flow rate of the heat medium circulating in the heating radiator It is in the point provided with a means.

  According to the above characteristic configuration, the flow rate of the heat medium that leads to the heating heat exchanger on the main body side is fixed to be equal to or higher than the total flow rate of the heat medium that leads to the heating radiator. The heat medium discharge temperature and the heat medium temperature received by the heat source unit side heat medium receiving unit are the same, so the discharge temperature of the heat medium discharged from the main body side heat medium discharge unit is the target temperature. Can perform relatively simple control.

A further characteristic configuration of the cogeneration system according to the present invention is as follows.
A heat medium flow state control means for variably controlling the flow rate of the heat medium that takes out a predetermined flow rate from the circulating heat medium and leads it to the heating heat exchanger on the main body side is provided.

  According to the above characteristic configuration, since the flow rate of the heat medium passing through the heating heat exchanger can be variably set, in addition to the control of the exchange heat amount by the hot water circulation state control, the heat medium and hot water are controlled by the heat medium flow state control. The temperature can be controlled. Thereby, the degree of freedom of temperature control is increased both in the heating operation in which the combined heat and power unit is operating and in the heat storage and heating operation in which the combined heat and power unit is stopped.

A further characteristic configuration of the cogeneration system according to the present invention is as follows.
The heat medium flow state control means is:
When the discharge temperature of the heat medium discharged from the main body side heat medium discharge portion is lower than the target temperature, the heat medium flow rate leading to the heating heat exchanger on the main body side is decreased,
When the discharge temperature of the heat medium discharged from the main body side heat medium discharge section exceeds the target temperature, the heat medium flow rate leading to the heating heat exchanger on the main body side is increased.

According to the above characteristic configuration, the heat medium flow state control means is configured such that, when the discharge temperature of the heat medium discharged from the main body side heat medium discharge section is lower than the target temperature, the heat medium flow rate that leads to the heating heat exchanger on the main body side Can be reduced, the temperature of the heating medium can be increased, and the temperature can be brought close to the target temperature.
On the other hand, when the discharge temperature of the heat medium discharged from the main body side heat medium discharge section exceeds the target temperature, the flow rate of the heat medium leading to the heat exchanger for heating on the main body side is increased, the temperature of the heat medium is decreased, and the target temperature Can be approached.

A further characteristic configuration of the cogeneration system according to the present invention is as follows.
The hot water circulation path is disposed so that a part of hot water whose exhaust heat has been recovered by the exhaust heat recovery heat exchanger is stored in the hot water storage tank and the other part can be passed to the heating heat exchanger. And
As the hot water circulation state control, a hot water flow rate ratio control means capable of adjusting a flow rate ratio between a hot water flow rate stored in the hot water storage tank and a hot water flow rate passing through the heating heat exchanger is provided,
When the discharge temperature of the heat medium discharged from the main body side heat medium discharge unit is lower than the target temperature, the hot water flow rate control means reduces the flow rate of hot water stored in the hot water storage tank, and the heating heat Increase the flow rate of hot water passing through the exchanger,
When the discharge temperature of the heat medium discharged from the main body side heat medium discharge unit exceeds the target temperature, the hot water flow rate ratio control means increases the flow rate of hot water stored in the hot water storage tank, and the heating heat The point is to reduce the flow rate of hot water passing through the exchanger.

According to the above characteristic configuration, when the discharge temperature of the heat medium discharged from the main body side heat medium discharge unit is lower than the target temperature, the heating load is larger than the amount of heat recovered by the heat medium at that time. The flow rate of hot water stored in the tank is decreased and the flow rate of hot water passing through the heating heat exchanger is increased. Thereby, the amount of heat recovered by the heat medium passing through the heating heat exchanger can be increased.
On the other hand, when the discharge temperature of the heat medium discharged from the main body side heat medium discharge unit exceeds the target temperature, the heating load is stored in the hot water storage tank because it is smaller than the amount of heat recovered by the heat medium at that time. While increasing the flow rate of hot water, the flow rate of hot water passing through the heat exchanger for heating is decreased. Thereby, the amount of heat recovered by the heat medium passing through the heating heat exchanger can be reduced.

A further characteristic configuration of the cogeneration system according to the present invention is as follows.
The main body side control unit receives information indicating that the heating operation is one of a low temperature heating operation and a high temperature heating operation as the target temperature related information via the communication unit.

  According to the above characteristic configuration, the main body side control unit can receive information on whether the heating operation is the low temperature heating operation or the high temperature heating operation via the communication unit. The hot water circulation state in can be controlled.

A further characteristic configuration of the cogeneration system according to the present invention is as follows.
When the main body side control unit receives information that the heating operation is a high temperature heating operation as the target temperature related information via the communication unit,
The main body side control unit directly receives the high temperature side target temperature as the target temperature related information, or determines that the target temperature is a prestored high temperature side target temperature.

According to the above characteristic configuration, when the main body side control unit receives the information that the heating operation is the high temperature heating operation as the target temperature related information, it further directly receives the high temperature side target temperature as the target temperature related information. The high temperature heating operation can be executed based on the high temperature side target temperature.
Moreover, since the main body side control unit can determine that the target temperature is the pre-stored high temperature side target temperature when the information that the heating operation is the high temperature heating operation is received as the target temperature related information, the high temperature side Based on the target temperature, the high-temperature heating operation can be executed.

A further characteristic configuration of the cogeneration system according to the present invention is as follows.
The heating operation starts heating at a temperature at which a discharge temperature of the heat medium discharged from the heat source unit side heat medium discharge unit is lower than the target temperature by a predetermined temperature, and heat discharged from the heat source unit side heat medium discharge unit It is an ON-OFF control operation in which heating is stopped at a temperature at which the discharge temperature of the medium is higher than the target temperature by a predetermined temperature,
When the main body side control unit receives the information that the heating operation is the low temperature heating operation as the target temperature related information via the communication unit, the heat source machine side heat medium as the target temperature related information Received by adding the discharge temperature of the heat medium discharged from the discharge unit, the heating start timing and the heating stop timing in the heat source unit, and the target temperature is discharged from the heat source unit side heat medium discharge unit at the heating start timing The temperature is estimated to be between the discharged temperature of the heat medium and the discharge temperature of the heat medium discharged from the heat source unit-side heat medium discharge section at the heating stop time.

Due to the configuration of the heat source machine, the target temperature of the heat medium guided to the heating radiator in the heating operation may not be received on the main body side of the cogeneration system. In this case, the target temperature in the heating operation cannot be known from the main body side of the cogeneration system.
On the other hand, in the heat source unit, the heating medium discharge temperature from the heat source unit side heat medium discharging unit during heating operation, and heating medium heating in the heating operation in which heating and non-heating of the heating medium are controlled ON-OFF The start time and the heating stop time of the heating medium can be known from the main body side of the cogeneration system.
Accordingly, in the present invention, the discharge temperature of the heat medium from the heat source machine side heat medium discharge part at the heating start time and the discharge temperature of the heat medium from the heat source machine side heat medium discharge part at the heating stop time. The temperature in between is estimated as the target temperature of the heating operation. Thereby, even when the target temperature of the heat medium guided to the heating radiator in the heating operation cannot be known on the main body side of the cogeneration system, the target temperature is appropriately estimated, and the target temperature Based on the above, hot water circulation state control can be executed.

A further characteristic configuration of the cogeneration system according to the present invention is as follows.
When the main body side control unit acquires information that the heating operation is the low temperature heating operation as the target temperature related information via the communication unit,
The main body side control unit directly receives the low temperature side target temperature as the target temperature related information, or determines that the target temperature is any one of a plurality of low temperature side target temperatures stored in advance. It is in.

According to the above characteristic configuration, the main body side control unit directly receives the low temperature side target temperature as the target temperature related information when receiving information that the heating operation is the low temperature heating operation as the target temperature related information. The low temperature heating operation can be executed based on the low temperature side target temperature.
In addition, when receiving information that the heating operation is the low temperature heating operation as the target temperature related information, the main body side control unit estimates that the target temperature is any one of a plurality of low temperature side target temperatures stored in advance. This makes the determination easier.

A further characteristic configuration of the cogeneration system according to the present invention is as follows.
When the non-heating time, which is the time during which the heat medium is not heated by the heat source device, exceeds the non-heating determination elapsed time, the main body side control unit is to determine that the target temperature has been changed to a lower side. .

As described above, the target temperature is estimated from the discharge temperature of the heat medium from the heat source machine side heat medium discharge part at the heating start time and the discharge temperature of the heat medium from the heat source machine side heat medium discharge part at the time of heating stop. When the target temperature is changed to a lower side by the user or the like, the hot water circulation state control is executed based on the target temperature estimated before the change. Therefore, the discharge temperature of the heat medium from the heat source unit side heat medium discharge unit is maintained in a state higher than the changed target temperature. In such a situation, since heating in the heat source device is not executed, the main body side of the cogeneration system cannot receive the heating start time and cannot estimate a new target temperature.
Therefore, in the above characteristic configuration, assuming such a situation, if the non-heating time in the heat source machine exceeds the non-heating determination elapsed time, it is determined that the target temperature in the heat source machine has been changed to the lower side. To do.
The main body side control unit executes hot water circulation state control based on the determination.

A further characteristic configuration of the cogeneration system according to the present invention is as follows.
When the combined heat and power unit is stopped,
The hot water circulation state control causes hot water stored in the hot water storage tank to flow to the heating heat exchanger.

  According to the above characteristic configuration, even when the combined heat and power supply unit is stopped and the exhaust heat is not generated, the exhaust heat stored in the hot water storage tank can be used for the heating load. Effective use can be achieved.

A further characteristic configuration of the cogeneration system according to the present invention is as follows.
It is in the point which is comprised by the integrated type which has arrange | positioned various site | parts in one housing | casing attached to the said heat-source device.

  According to the above characteristic configuration, since the heat source unit is a separate body and the combined heat and power supply unit is built in the same housing as the hot water storage tank, etc., it can be configured as an integrated type, thus simplifying transportation and installation work. In addition, the installation area and manufacturing cost can be reduced.

Heating equipment to achieve the above purpose
It is a heating facility equipped with the above-mentioned cogeneration system, and its characteristic configuration is
The cogeneration system and the heat source device are connected to each other through the heating circulation path that circulates the heat medium between them.

  According to the said heating installation, the effect equivalent to the cogeneration system mentioned above can be show | played favorably.

The schematic block diagram of the heat-source machine in 1st Embodiment, and the heating-medium circulation path for heating The figure which shows the schematic structure of the cogeneration system of 1st Embodiment, and the state at the time of hot-water supply driving | operation The figure which shows the schematic structure of the cogeneration system of 1st Embodiment, and the state at the time of hot water storage driving | operation The figure which shows the schematic structure of the cogeneration system of 1st Embodiment, and the state at the time of the heating operation in a non-heat storage state The figure which shows the state at the time of heating operation in the schematic structure and heat storage state of the cogeneration system of 1st Embodiment. The figure which shows the state at the time of heating operation by schematic structure of the cogeneration system of 1st Embodiment, and heat storage Control flow diagram related to high temperature heating operation of the first embodiment Control flow chart according to low temperature heating operation of the first embodiment Control flow chart related to heating operation by heat storage in the first embodiment The graph which shows the temperature transition state of the hot water and the heat medium in the heat exchanger for heating in the case of performing the heating operation by the heat storage in the first embodiment Schematic configuration diagram of heat source device and heating medium circulation path for heating in the second embodiment The figure which shows the schematic structure of the cogeneration system of 2nd Embodiment, and the state at the time of the heating operation in a non-heat storage state The figure which shows the state at the time of the heating operation in the schematic structure and heat storage state of the cogeneration system of 2nd Embodiment. The figure which shows the state at the time of the heating operation by schematic structure of the cogeneration system of 2nd Embodiment, and heat storage Control flow diagram related to high temperature heating operation of second embodiment Control flow diagram related to low-temperature heating operation of the second embodiment Control flow chart related to heating operation by heat storage of the second embodiment

[First Embodiment]
A first embodiment of a cogeneration system according to the present invention will be described with reference to the drawings.
In addition, as shown in FIG. 1, the cogeneration system 40 which concerns on this embodiment is comprised so that it may be arranged in parallel with the heat-source equipment 10, Specifically, one of the heat-source equipment 10 arranged in parallel. It is configured as an integrated type in which various parts are arranged in the housing.

[Heat source machine]
First, the structure of the heat-source equipment 10 installed in parallel with the cogeneration system 40 of this embodiment is demonstrated based on FIG.
As will be described in detail later, the heat source unit 10 is configured as a general hot water heater, and heats the hot water W supplied from the water supply via the heat source unit side water inlet 20a to a preset hot water supply temperature. In addition to performing a so-called hot water supply operation to be supplied to the hot water tap 30, a heating operation for heating the heating medium flowing through the heating circulation path 34 for circulating the heated heating medium to the heating radiator 33 is performed. The cogeneration system 40 is configured to be arranged in parallel.
The external interface is provided on one end side of the water supply pipe 20 and is provided on the other end side of the heat source machine side water intake portion 20 a that takes hot water W into the water supply pipe 20 from the outside and the water supply pipe 20. The heat source machine side water discharge part 20b for discharging the hot water W of the heat source to the outside, the heat source machine side heat medium receiving part 16a provided on one end side of the heat medium pipe line 16 and taking in the heat medium H from the outside into the heat medium pipe line 16a, A heat source machine side heat medium discharge section 16b that is provided on the other end side of the heat medium pipe line 16 and discharges the heat medium H of the heat medium pipe line 16 to the outside, and a fuel gas G that is a natural gas city gas is taken in A fuel gas supply unit 14 is provided.
The heat source machine side water outlet 20b is connected to the hot water tap 30 so that the hot water W discharged from the heat source machine side water outlet 20b is supplied to the hot water tap 30.
Further, the heat source unit side heat medium receiving unit 16a and the heat source unit side heat medium discharging unit 16b are heating circulation units provided between a plurality of heating radiators 33 of different types such as a bathroom heater and a hot water floor heating panel. The heating medium H circulating in the passage 34 is taken in or discharged and connected to the heating circulation passage 34. Specifically, the heat medium H discharged from the heat source unit side heat medium discharge unit 16b is supplied to the heating radiator 33 provided in the heating circulation path 34 via the forward header 31, while the heating radiator The heat medium H that has passed through 33 is returned to the heat source unit side heat medium receiving unit 16a through the return header 32 in a state where the flow rate of the heat medium H guided to the cogeneration system 40 in the heat medium H can be adjusted. .

The heat source unit 10 is provided with a heat source unit side control unit 25 that includes a computer that controls the operation of burners 11a and 12a, which will be described later, and controls the operation of various auxiliary devices such as valves and pumps.
The heat source device side control unit 25 is configured to be able to communicate with the remote controller 27 installed in the residence via the communication unit 26. With this configuration, the set hot water supply temperature and the heating operation at the time of hot water supply from the remote controller 27 are configured. The type of operation, stop, and heating operation can be operated. In addition, the communication unit 26 is configured to be able to perform two-way wireless or wired communication with a communication unit 96 on the cogeneration system 40 side described later.

The heat source unit 10 takes in the hot water supply unit 11 for heating the hot water W taken in the heat source unit side water intake unit 20a and discharged from the heat source unit side water discharge unit 20b, and the heat source unit side heat medium receiving unit 16a. And a heating unit 12 for heating to heat the heat medium H discharged from the machine-side heat medium discharge unit 16b.
The hot water supply heating unit 11 heats the burner 11a for burning the fuel gas G supplied through the regulating valve 11c with the combustion air supplied by the fan 13 and the high-temperature combustion gas discharged from the burner 11a. The hot water supply heat exchanger 11b that heats the hot water W flowing through the water supply pipe 20 by replacement is configured.
On the other hand, the heating unit 12 for heating includes a burner 12a for burning the fuel gas G supplied via the regulating valve 12c with combustion air supplied by the fan 13, and a high-temperature combustion gas discharged from the burner 12a. And a heating heat exchanger 12b for heating the heat medium H flowing through the heat medium pipe line 16 by heat exchange.

In addition, an incoming water temperature sensor 21 that detects the temperature of hot water W taken from the heat source machine side water intake section 20a (hereinafter sometimes referred to as “heat source machine side incoming temperature”) and a water source side of the water source pipe 20 are provided. A water temperature sensor 22 for detecting the temperature of hot water W discharged from the water outlet 20b (hereinafter sometimes referred to as “heat source machine side water temperature”) and a water switch 23 for detecting the flow of the hot water W are disposed. ing.
On the other hand, the heat medium pipe 16 detects the temperature of the heat medium H taken from the heat source apparatus side heat medium receiving section 16a (hereinafter, sometimes referred to as “heat source apparatus side heat medium temperature”). A temperature sensor 17, and a heat output medium temperature sensor 18 for detecting the temperature of the heat medium H discharged from the heat source apparatus side heat medium discharge section 16b (hereinafter sometimes referred to as "heat source apparatus side output heat medium temperature"); A heat medium circulation pump 19 that sends out the heat medium H is disposed.

  With such a configuration, the heat source device side control unit 25 heats the hot water W supplied from the heat source device side water intake unit 20a to a set hot water temperature set in advance by the remote controller 27 and supplies it to the hot water tap 30. During the heating operation, the heating operation for heating the heating medium H circulating in the heating circulation path 34 provided between the heating radiator 33 and the heating radiator 33 to a preset target temperature can be executed.

(Hot water operation)
In the hot water supply operation, in the state where the water switch 23 disposed in the water supply line 20 detects the flow of the hot water W by opening the hot water tap 30, the incoming water temperature detected by the incoming water temperature sensor 21 is set. When the temperature is lower than the hot water supply temperature, the burner 11a performs the combustion operation in which the fuel gas G is burned. Further, in this hot water supply operation, the combustion amount in the burner 11a is adjusted by the adjustment valve 11c that adjusts the supply amount of the fuel gas G so that the heat source side water discharge temperature detected by the water discharge temperature sensor 22 becomes the set hot water supply temperature. It is adjusted by opening control.
Therefore, when the hot water tap 30 is opened, a hot water supply operation is appropriately performed, and the hot water W at the set hot water temperature is supplied to the hot water tap 30.

Further, the water supply pipe 20 is provided with a bypass adjustment valve 24 in a form of connecting the upstream side and the downstream side of the hot water supply heat exchanger 11b.
In the hot water supply operation, in addition to controlling the gas flow rate by adjusting the opening amount of the adjustment valve 11c and adjusting the combustion amount in the burner 11a as described above, the bypass flow rate is controlled by opening amount control of the bypass adjustment valve 24. Make fine adjustments to control the temperature of the hot water supply to the set temperature more accurately.

(Heating operation)
In the heating operation, the heating operation start button is pushed on the remote controller 27 to start the operation of the heat medium circulation pump 19 disposed in the heat medium pipe line 16, and the heat medium H flows through the heat medium pipe line 16. When the heat source medium side heat input medium temperature detected by the heat input medium temperature sensor 17 is lower than the target temperature, the combustion operation is performed in which the fuel gas G is burned by the burner 12a.
In the heating operation, the combustion state of the burner 12a can control the flow rate of the fuel gas G so that the heat source unit side heat medium temperature detected by the heat medium temperature sensor 18 becomes the target temperature. At the same time, it is adjusted by opening control of the regulating valve 12c that can switch between the supply and supply stop states of the fuel gas G.
Although details will be described later, the heating operation includes a high temperature heating operation and a low temperature heating operation, and the low temperature heating operation includes a hot dash operation, a normal low temperature heating operation, a floor heating low load operation, and the like. The target temperature in each operation is a different temperature.

[Cogeneration system]
Next, an embodiment of the cogeneration system 40 according to the present invention will be described with reference to FIGS.
2 to 6 show various operating states of the cogeneration system 40. The pipe through which the hot water W, the cooling water C, or the fluid of the heating medium H flows is indicated by a thick solid line. Piping that does not allow fluid to flow is indicated by a thin solid line.
As shown in FIG. 2, the cogeneration system 40 is configured as an integrated type in which various parts are arranged in one housing that is arranged in parallel with the heat source device 10 described above.
The cogeneration system 40 has, as external interfaces, a main body side water intake portion 80a that takes in hot water W (water) from the water supply, a main body side water discharge portion 78a that discharges the hot water W to the heat source device 10, and the drainage of the hot water storage tank 90. A drain valve 75 for performing heating, a main body side heat medium receiving portion 102a for taking in the heating medium H from the heat source device 10 side, a main body side heat medium discharging portion 102b for discharging the heat medium H to the heat source device 10 side, and the like. ing.
In addition, a cogeneration system 41 provided on the cogeneration system 40 side and a main body side control unit 95 including a computer for controlling the operation of various auxiliary machines such as valves and pumps are provided. This main body side control unit 95 performs two-way wireless or wired communication with the communication unit 26 on the heat source device 10 side via the communication unit 96, or a display unit (not shown) provided outside. Communication for performing a predetermined display such as an operating state is performed.
Specifically, although details will be described later, a set hot water supply temperature set on the heat source device 10 side or a target temperature for heating operation is set from the communication unit 26 of the heat source device 10 to the communication unit 96 of the cogeneration system 40. The target temperature related information related to the heat source device 10 is output, and conversely, command information for restricting the hot water supply operation by the heat source device 10 is output from the communication unit 96 of the cogeneration system 40 to the communication unit 26 of the heat source device 10. Is done.
In the heat source device 10 that has received the input of the command information, when the command information prohibits the execution of the hot water supply operation, the hot water supply operation is performed even when the hot water W is supplied to the hot water tap 30. It is configured not to run.

  The cogeneration system 40 includes a cogeneration unit 41 that generates electric power and heat, such as a fuel cell or an engine-driven generator, and the generated electric power is connected to a commercial power supply through an inverter or the like as appropriate. Supplied to an external power load or the like. Further, the heat generated by the combined heat and power supply unit 41 is used for heating the hot water W, and a hot water storage tank 90 for storing the heated hot water W is provided.

The cogeneration unit 41 has a structure that is cooled by cooling water C that flows through a water cooling jacket (not shown) provided therein, and is provided with a cooling water circulation path 42 through which the cooling water C circulates.
In the cooling water circulation path 42, a cooling water pump 46 that sends out the cooling water C along the circulation direction of the cooling water C, a cooling water jacket (not shown) in the combined heat and power supply unit 41, and cooling water discharged from the cooling water jacket A high temperature side cooling water temperature sensor 50 that detects the temperature of C (hereinafter sometimes referred to as “high temperature side cooling water temperature”), an exhaust heat recovery heat exchanger 55, and a buffer tank that temporarily stores the cooling water C 51 are arranged in the order of description.
The buffer tank 51 is provided with a low-temperature side cooling water temperature sensor 49 that detects the temperature of the cooling water C temporarily stored (hereinafter sometimes referred to as “low-temperature side cooling water temperature”). Moreover, the hot water W supplied to the main body side water inlet 80 a is appropriately replenished to the buffer tank 51 as the cooling water C through the electromagnetic valve 52.

The exhaust heat recovery heat exchanger 55 is configured to perform heat exchange between the cooling water C flowing through the cooling water circulation path 42 and the hot water W flowing through the heating hot water storage circulation path 60.
That is, when the cooling water pump 46 is operated and the cooling water C is circulated through the cooling water circulation path 42 in a state where heat is generated in the combined heat and power supply unit 41, the cooling heated through the combined heat and power supply unit 41 is performed. The water C passes through the exhaust heat recovery heat exchanger 55 to exchange heat with the hot water W and is supplied to the combined heat and power supply unit 41 again.

The hot water storage tank 90 is configured as a sealed tank in which the hot water W is supplied to the lower part 90b and the hot water W is taken out from the upper part 90a to the main body side water discharge part 78a. Further, the hot water W taken out from the lower part 90 b of the hot water storage tank 90 is passed through the exhaust heat recovery heat exchanger 55 to be heated by the heat generated by the combined heat and power supply unit 41 and returned to the upper part 90 a of the hot water storage tank 90. A heated hot water storage circuit 60 for circulating hot water W is provided.
The heated hot water storage circuit 60 is connected to the lower part 90b of the hot water storage tank 90 via a three-way valve 73 to the bottom pipe line 72 connected to the lower part 90b. The upper portion 90a is connected to the upper pipe line 66 connected to the upper portion 90a via a proportional valve 65.
Further, a hot water bypass path 67 is connected to the upper pipe line 66, and the other end portion of the hot water bypass path 67 is disposed in the heating hot water circulation circuit 60 via a check valve 69. Connected to the regulating valve 68.

The heating hot water storage circuit 60 has a three-way regulating valve 68 for adjusting the flow rate of the hot water W flowing through the hot water bypass path 67 along the flowing direction of the hot water W, a circulation pump 61 for sending the hot water W, and exhaust heat recovery heat exchange. The circulating water high temperature sensor 63 for detecting the temperature of the hot water W after passing through the heat exchanger 55 and the exhaust heat recovery heat exchanger 55 (hereinafter sometimes referred to as “high temperature side hot water temperature”), and the flow rate of the hot water W A circulating flow rate sensor 62 to detect, a hot water temperature sensor 64 to detect the temperature of hot water W flowing into the upper part 90a of the hot water tank 90 (hereinafter sometimes referred to as “hot water temperature”), a proportional valve 65, and a hot water tank 90. Are arranged in the order of description.
In addition, in the heating hot water storage circuit 60, a part of the hot water circulating through the heating hot water storage circuit 60 is led to the heating heat exchanger 100 for exchanging the hot water W with the heat medium H. A hot water flow channel 70 is provided, and a proportional valve 71 capable of adjusting the flow rate of hot water is provided in the hot water flow channel 70 for heating.

As shown in FIGS. 1 and 2, the main body side heat medium receiving portion 102 a provided at one end of the heat medium flow path 101 in which the heat exchanger 100 for heating is disposed, and the other side of the heat medium flow path 101. Both of the main body side heat medium discharge portions 102 b provided at the end portions are connected to the return header 32.
That is, the heating medium H that has radiated heat through the heating radiator 33 in the heating circulation path 34 is disposed in the heating medium flow path 101 via the return header 32 and the main body side heat medium receiving portion 102a. Heat is recovered from the hot water through the heat exchanger 100 for use. The heat medium H after passing through the heating heat exchanger 100 returns to the return header 32 via the main body side heat medium discharge part 102b, and the return header 32 passes from the heating circulation path 34 to the return header 32. It will be in a state in which it can be mixed with the flowing heat medium H. The heat medium H flowing out from the return header 32 is supplied to the heating heat exchanger 12b disposed in the heat medium pipe line 16 of the heat source apparatus 10 via the heat source apparatus side heat medium receiving portion 16a, and further, the heating heat The heat medium H after passing through the exchanger 12b is supplied to the heating radiator 33 arranged in the heating circulation path 34 via the heat source unit side heat medium discharge part 16b and the forward header 31.

Further, the upper pipe line 66 connected to the upper part 90 a of the hot water storage tank 90 is connected to the main body side water discharge part 78 a via the three-way adjustment valve 77 and the hot water discharge pipe 78, and upstream of the three-way adjustment valve 77. Is provided with an extracted water temperature sensor 76 for detecting the temperature of the hot water W taken out from the upper portion 90a of the hot water storage tank 90 to the upper conduit 66 (hereinafter sometimes referred to as “tank extracted hot water temperature”). The detection of the temperature of the discharged hot water from the tank may be performed by the temperature sensor 91a provided at the top of the plurality of temperature sensors 91 distributed in the vertical direction of the hot water storage tank 90, instead of the temperature sensor 76. I do not care.
The three-way regulating valve 77 is connected to a water supply conduit 82 that leads to the main body side water inlet 80a. Further, the hot water outlet line 78 and the water supply line 82 are connected by a bypass line 86, and an electromagnetic valve 87 capable of interrupting the flow of the hot water W is disposed in the bypass line 86.
That is, the three-way regulating valve 77 can mix hot water W supplied from the water supply pipe 82 with mixing ratio adjustment with hot water W supplied from the upper portion 90a of the hot water storage tank 90 to the main body water outlet 78a. Functions as a mixing unit.
In addition, on the downstream side of the connection portion of the hot water supply pipe 78 with the bypass pipe 86, the flow rate sensor 79 that detects the flow rate of the hot water W and the main body side water discharge part 78a are discharged along the flow direction of the hot water W. Water temperature sensor 81 for detecting the temperature of hot water W (hereinafter sometimes referred to as “main body side water temperature”) is arranged in the order described.
On the other hand, on the upstream side of the connecting portion of the water supply pipe 82 with the bypass pipe 86, the pressure reducing valve 84 that adjusts the pressure of the hot water W and the main body side water inlet 80 a are supplied along the flowing direction of the hot water W. A temperature sensor 85 for detecting the temperature of the hot and cold water W (hereinafter sometimes referred to as “main body side incoming temperature”) and a check valve 83 for preventing the back flow of the hot water W are arranged in the order described.

Further, the water supply pipe 82 is connected to the three-way valve 73 of the bottom pipe line 72 connected to the lower part 90b of the hot water storage tank 90 via a check valve 89. With this configuration, in the hot water storage tank 90, At the same time as the hot water W is taken out from the upper part 90 a, the hot water W is supplied from the lower part 90 b through the water supply pipe 82, the three-way valve 73, and the bottom pipe 72.
As explained so far, the heated hot water storage circuit 60, the hot water bypass path 67, and the hot and cold water passage 70 for heating function as a hot water circuit.

The main body control unit 95 is configured to execute predetermined operation command control and mixing control, which will be described in detail later.
In this operation command control, the main body side outlet temperature is set based on the temperature of the hot water W taken out from the upper portion 90 a of the hot water storage tank 90 to the upper pipe 66, that is, the temperature of the extracted hot water detected by the outgoing water temperature sensor 76. It is determined whether the temperature is lower than the temperature of the discharged water, and based on the determination result, it is determined whether the hot water supply operation of the heat source device 10 is possible, and the hot water supply operation by the heat source device 10 is limited according to the determined hot water supply operation. Command information is output to the heat source device 10 via the communication unit 96.
On the other hand, in the mixing control, based on the set hot water supply temperature received from the heat source device 10 or the remote controller 27 via the communication unit 96, a target water discharge temperature that is a target value of the main body side water discharge temperature is determined, and the determined target The three-way regulating valve 77 as a mixing unit is controlled based on the water temperature.
The set hot water supply temperature received from the heat source device 10 or the remote controller 27 is the set hot water temperature received from the heat source device 10 side below.
With the configuration as described above, the cogeneration system 40 can execute the following hot water supply operation, hot water storage operation, and heating operation. Here, the heating operation includes a high-temperature heating operation in which the target temperature of the heat source unit side heat transfer medium temperature is high, and a low-temperature heating operation in which the target temperature is low.
The high-temperature heating operation and the low-temperature heating operation are heating operations that do not store exhaust heat that radiates all of the heat recovered from the exhaust heat recovery heat exchanger 55 in the heating heat exchanger 100 (operation in the state shown in FIG. 4). ), And a part of the heat recovered from the exhaust heat recovery heat exchanger 55 is stored in the hot water storage tank 90, and a part of the exhaust heat which is an operation of dissipating the other part in the heating heat exchanger 100 is stored. The heating operation (operation in the state shown in FIG. 5) is switched and executed.
Further, in the cogeneration system 40 of the present application, as shown in FIG. 6, the heating operation (high temperature and low temperature) is performed only by the heat stored in the hot water storage tank 90, and the heating operation by heat storage can be executed. ing.
Therefore, in the following, after explaining the hot water supply operation and the hot water storage operation, the heating operation that does not store the exhaust heat and the heating operation that stores a part of the exhaust heat will be described, and then the high temperature heating operation, the low temperature heating operation, and the heating by heat storage will be described. The operation will be described.

(Hot water operation)
As shown in FIG. 2, in the hot water supply operation, hot water W is supplied from the heat source side water outlet 20b of the heat source unit 10 to the hot water tap 30 by opening the hot water tap 30, and accordingly, the main body side outlet 78a. The hot water W is supplied to the heat source unit side water intake section 20a from the hot water supply unit 20a, and the flow of the hot water W is detected by the flow rate sensor 79 disposed in the hot water outlet pipe 78 accordingly.
In such a hot water supply operation, the relatively hot water W in the upper layer of the hot water storage tank 90 is taken out from the upper portion 90 a to the upper conduit 66 and supplied to the hot water outlet 78 through the three-way regulating valve 77.
Furthermore, in this hot water supply operation, the target water discharge temperature is once determined to be equal to the set hot water temperature that has received input from the heat source device 10 side or a temperature slightly higher than the set hot water temperature in consideration of heat radiation. Then, the mixing control is executed, and the opening degree of the three-way regulating valve 77 is controlled.
That is, in this mixing control, when the tank outlet hot water temperature detected by the outgoing water temperature sensor 76 is equal to or higher than the target outlet water temperature, an appropriate hot water W is mixed in the three-way regulating valve 77, so that the target outlet water temperature is reached. Hot water W is obtained, and the hot water W is supplied to the heat source unit side water inlet 20 a of the heat source unit 10.
Further, in the operation command control by the main body side control unit 95, prohibition of execution of the hot water supply operation in the heat source apparatus 10 is determined, and command information for prohibiting execution of the hot water supply operation is transmitted via the communication units 96 and 26 to the heat source. Output to the machine control unit 25.
Then, in the heat source unit 10, if the heat source unit side incoming water temperature is equal to or higher than the set hot water supply temperature, it is not necessary to reheat the hot water W. Is supplied to the hot-water tap 30 as it is. Further, even if the heat source machine side incoming water temperature is slightly lower than the set hot water supply temperature, execution of useless hot water supply operation is prohibited by the input command information. Therefore, while the thermal efficiency of the heat source device 10 is improved, the hot water W stored in the hot water storage tank 90 is effectively used, and the energy efficiency of the entire system is improved.

  On the other hand, when the tank outlet hot water temperature detected by the outlet water temperature sensor 76 is lower than the target outlet water temperature, the target outlet water temperature is set to a temperature sufficiently lower than the set hot water supply temperature (for example, 30 ° C.). The amount of hot water W supplied through the regulating valve 77 is increased, and hot water W below the target hot water temperature set lower is discharged from the main body side water discharge section 78a.

(Hot water storage operation)
As shown in FIG. 3, the so-called hot water storage operation for storing hot water W heated by the heat generated by the combined heat and power supply unit 41 is performed while the combined heat and power supply unit 41 generates heat and the cooling water pump 46 and the circulation pump. 61 operates, in the exhaust heat recovery heat exchanger 55, the cooling water C maintained at a relatively high temperature (for example, about 75 ° C. to 80 ° C.) and the relatively low temperature hot water taken out from the lower portion 90b of the hot water storage tank 90. Heat exchange with W is performed, and the hot water W is heated, while the cooling water C is cooled.
And the hot water W heated in this way flows into the upper part 90a of the hot water storage tank 90 through the proportional valve 65 and the upper pipe line 66. As a result, the hot water storage tank 90 has a hot water W at the upper part. The hot water W is stored in a state where a temperature stratification is formed in a state where there is low temperature hot water W in the lower portion.
Further, since the hot water W is stored in a form in which temperature stratification is formed in the hot water storage tank 90, the hot water storage tank 90 stores the hot water W in the upper layer of the hot water storage tank 90 based on the detection results of the plurality of temperature sensors 91 arranged in the vertical direction. The amount of hot water W, that is, the amount of stored hot water can be determined.

Furthermore, in this hot water storage operation, the temperature of the hot water W heated by the exhaust heat recovery heat exchanger 55 and the hot water temperature detected by the circulating water high temperature sensor 63 become a predetermined temperature (for example, about 75 ° C.). As described above, the opening degree of the three-way regulating valve 68 is controlled.
Specifically, the hot water W heated by the exhaust heat recovery heat exchanger 55 is not supplied to the hot water storage tank 90 by increasing the opening degree of the three-way regulating valve 68 on the hot water bypass path 67 side. When the ratio of the hot water W that is recirculated to the upstream side of the exhaust heat recovery heat exchanger 55 via the hot water bypass passage 67 increases, the high temperature side hot water temperature rises. And using this principle, the hot water temperature is adjusted to a predetermined temperature.

(Heating operation that does not store exhaust heat)
As shown in FIG. 4, in the heating operation that does not store the exhaust heat, the heat generated in the combined heat and power supply unit 41 is not stored in the hot water storage tank 90, and the heating heat disposed in the hot water passage channel 70 for heating is used. The exchanger 100 supplies the heat medium.
In the heating operation that does not store the exhaust heat, the main body side control unit 95 receives information on the start of the heating operation from the heat source unit side control unit 25 while operating the combined heat and power supply unit 41 to generate heat, and the cooling water pump 46 By operating the circulation pump 61 and the heat medium circulation pump 103 (an example of the heat medium flow state control means), the exhaust heat recovery heat exchanger 55 causes a relatively high temperature (for example, about 75 ° C. to 80 ° C.). The heat exchange between the maintained cooling water C and the circulating hot water W is performed, and the heat exchange between the hot water W and the heat medium H is performed in the heating heat exchanger 100 so that the heat medium H is heated. Is executed.
In the heating operation in which the exhaust heat is not stored, the heating medium H after passing through the heating radiator 33 in the heating circulation path 34 first passes through the return header 32 and the main body side heating medium receiving portion 102a. It is supplied to the heating heat exchanger 100 arranged in the flow path 101 and heated by heat exchange with the hot water W in the heating heat exchanger 100.
Further, as shown in FIGS. 1 and 4, the heat medium H heated through the heating heat exchanger 100 is guided to the return header 32 via the main body side heat medium discharge section 102 b and heated. The heating medium after passing through the heating radiator 33 disposed in the circulation path 34 can be mixed. The heat medium H that has passed through the return header 32 is supplied to the heating heat exchanger 12 b disposed in the heat medium pipe line 16 of the heat source apparatus 10. Here, in the heat source device 10, the heating operation is appropriately executed, and the heat medium H is heated to the set target temperature. Then, the heat medium H having reached the set target temperature is supplied again to the heating radiator 33 disposed in the heating circulation path 34 via the heat source unit side heat medium discharge part 16b and the forward header 31. It becomes.

  That is, at least a part of the heat radiated by the heating radiator 33 is supplemented by the exhaust heat generated by the combined heat and power supply unit 41, and the energy efficiency of the entire system is further improved.

(Heating operation to store part of exhaust heat)
As shown in FIG. 5, in the heating operation for storing a part of the exhaust heat, a part of the heat generated in the combined heat and power supply unit 41 is stored in the hot water storage tank 90, and the other part is used as a hot water passage for heating. The heating medium 100 is supplied to the heat medium H by the heating heat exchanger 100 arranged at 70.
In the heating operation for storing a part of the exhaust heat, the main body side control unit 95 receives information on the start of the heating operation from the heat source unit side control unit 25 while generating heat by operating the combined heat and power supply unit 41, and cooling. By operating the water pump 46, the circulation pump 61, and the heat medium circulation pump 103 and adjusting the opening degree of the proportional valve 65 provided upstream of the upper portion 90a of the hot water storage tank 90 in the heated hot water storage circuit 60, the exhaust heat recovery is performed. The heat exchanger 55 performs heat exchange between the cooling water C maintained at a relatively high temperature (for example, about 75 ° C. to 80 ° C.) and the circulating hot water W, and one of the hot water W heated by the heat exchange. The hot water is stored in the hot water storage tank 90, and the other part is passed through the heating heat exchanger 100 disposed in the heating hot water flow passage 70, and the hot water W and heat are heated in the heating heat exchanger 100. Heat exchange with the medium H is performed, and the heat medium H is heated. It is executed in a form.
In the heating operation in which a part of the exhaust heat is stored, the circulation state of the heat medium H after passing through the heating radiator 33 in the heating circulation path 34 is the same as the heating operation in which the exhaust heat is not stored. Therefore, the detailed explanation is omitted here.
By performing the heating operation for storing a part of the exhaust heat, the heat necessary for heating out of the heat generated in the combined heat and power supply unit 41 is supplied from the heating heat exchanger 100 to the heat medium H, and The remaining portion can be stored in the hot water storage tank 90 to improve energy saving.

In addition, in this application, in order to aim at the further improvement of energy efficiency, the main body side control part 95 receives the target temperature relevant information relevant to the target temperature in the heat-source equipment 10 mentioned above, and the said target temperature relevant Based on the information, in the heating operation in which the exhaust heat is not stored and in the heating operation in which a part of the exhaust heat is stored, by controlling the circulation state of the hot water W and the circulation state of the heat medium H, the heat source device 10 to be described later The high temperature heating operation in which the target temperature of the heat medium H set on the side is high and the low temperature heating operation in which the target temperature is low are executed.
Hereinafter, the high temperature heating operation and the low temperature heating operation will be described in detail.

(High temperature heating operation)
The high-temperature heating operation is a heating operation that is performed when the heating radiator 33 that requires a relatively high temperature, such as a bathroom heating dryer, is operated.
In the high temperature heating operation, the main body side control unit 95 receives information related to the execution of the high temperature heating operation from the heat source device 10 via the communication unit 96, and based on the information, the circulating state of the hot water W and the heat medium H Control the circulation state of Hereinafter, the flow of control related to the high-temperature heating operation will be described based on the control flow of FIG. 7 with reference to the schematic configuration diagrams of the cogeneration system of FIGS. 4 and 5.

The main body side control unit 95 receives information that the heating operation is the high temperature heating operation from the heat source unit 10 side via the communication unit 96 (# 01).
When receiving information related to the execution of the high temperature heating operation, the main body side control unit 95 stores the target temperature of the heat medium H in the high temperature heating operation in advance in the high temperature side target temperature (not shown) (not shown). (# 02).

  The main body side control unit 95 sets the flow rate of the heat medium H passing through the heating heat exchanger 100 to the minimum flow rate. On the other hand, the main body side control unit 95 distributes the entire flow rate of the hot water W whose exhaust heat has been recovered by the exhaust heat recovery heat exchanger 55 to the heating heat exchanger 100 side, and supplies the hot water W to the hot water storage tank 90 side. The distribution amount is set to zero (# 03).

In the cogeneration system 40, the main body side control unit 95 circulates the cooling water C through the cooling water circulation path 42 in order to recover the exhaust heat of the cogeneration unit 41 in a situation where the operation of the cogeneration unit 41 is maintained. Let
The main body side control unit 95 maintains the rotational speed of the cooling water pump 46 at a constant value so as to maintain the circulating flow rate of the cooling water C at a constant level, to the heat recovery heat exchanger 55 disposed in the cooling water circulation path 42. The temperature of the cooling water C is maintained at 75 ° C to 80 ° C.
On the other hand, the main body side control unit 95 opens the three-way regulating valve 68 (an example of hot water flow rate control means) to maintain the temperature of the hot water W stored in the hot water storage tank 90 at the target hot water storage temperature (75 to 77 ° C.). The flow rate ratio between the flow rate of hot water W guided to the hot water storage tank 90 side and the flow rate of hot water W guided to the hot water bypass passage 67 side bypassing the hot water storage tank 90 is controlled (# 04). .

  The main body side control unit 95 brings the amount of heat collected by the heat medium H in the heating heat exchanger 100 closer to the heating load, and in order to bring the main body side heat output medium temperature closer to the high temperature side target temperature, the heating heat exchanger 100. The amount of heat recovered by the heat medium H is controlled by the flow rate of the hot water W passing through the heating heat exchanger 100, and the temperature of the heat medium H is controlled by the flow rate of the heat medium H passing through the heating heat exchanger 100. Control by. Hereinafter, the control will be described.

When the main body side heat output medium temperature is lower than the high temperature side target temperature (# 05), the main body side control unit 95 determines that the amount of heat recovered by the heat medium H at this time is smaller than the heating load, and heat for heating Of the flow rate of hot water led to the exchanger 100 and the hot water storage tank 90, the distribution amount of the hot water W to the heating heat exchanger 100 is increased until the distribution amount of the hot water to the heating heat exchanger 100 is maximized. (# 06, 07). Thereby, the amount of heat recovered by the heat medium H increases.
Further, the flow rate of the heat medium H passing through the heating heat exchanger 100 is decreased until the flow rate of the heat medium H passing through the heating heat exchanger 100 is minimized (# 08, 09, 10). Thereby, the temperature of the heat medium H rises and approaches the target temperature.
Here, when the flow rate of the heat medium H is minimized, the reached temperature may not reach the high temperature side target temperature. In this case, the heat medium H is heated to the high temperature side target temperature by the heat source device 10 and is led to the heating radiator 33.

On the other hand, when the main body side heat medium temperature exceeds the high temperature side target temperature (# 05), the main body side control unit 95 passes through the heating heat exchanger 100 to lower the main body side heat medium temperature to the target temperature. The flow rate of the heat medium H to be increased is increased until the flow rate of the heat medium H passing through the heating heat exchanger 100 is maximized (# 11, 12). As a result, the temperature of the heat medium H decreases and approaches the target temperature.
Furthermore, if the heat discharge temperature does not drop to the target temperature, it is determined that the amount of recovered heat is excessive, and the heating heat exchanger 100 out of the flow rate of hot water led to the heating heat exchanger 100 and the hot water storage tank 90 is determined. The amount of hot water W distributed to the heat exchanger 100 is decreased until the amount of hot water distributed to the heat exchanger 100 for heating is minimized (# 13, 14). As a result, the amount of heat recovered by the heat medium H is reduced.

(Low temperature heating operation)
Even when the low temperature heating operation is performed, the main body side control unit 95 receives information that the heating operation is the low temperature heating operation from the heat source device 10 side via the communication unit 96.
The low-temperature heating operation includes a plurality of types of hot dash operation, normal low-temperature heating operation, and low-temperature floor heating operation, and the corresponding low-temperature target temperatures are about 72 ° C., 60 ° C., and 40 ° C., respectively. . And in the heat source machine 10, the heat source machine side control part 25 has memorize | stored the said low temperature side target temperature, and the heat source machine side output heat medium temperature of the heat medium H becomes the said memorize | stored target temperature. The heating state in the burner 12a is controlled.
It is preferable that the main body side of the cogeneration system 40 receives the low temperature target temperature, and controls the circulation state of the hot water W and the circulation state of the heat medium H during the heating operation based on the low temperature target temperature. However, the low temperature target temperature stored in the heat source unit control unit 25 cannot be output to the outside for design reasons.
On the other hand, since the heat source device 10 is provided with the heat output medium temperature sensor 18 for measuring the heat output temperature on the heat source side of the heat medium H, the heat medium H measured by the heat output medium temperature sensor 18 is provided. The temperature can be output to the outside.
Further, in the heat source unit 10, the burner 12a that heats the heating medium passing through the heating heat exchanger 12b has a temperature of the heating medium H that is lower than the lower temperature target temperature in order to maintain the temperature of the heating medium H at the target temperature. Combustion occurs when the temperature is lower, and combustion is stopped when the temperature of the heat medium H is higher than the low-temperature target temperature by a predetermined temperature. The heat source apparatus 10 starts combustion at the burner 12a. It is also possible to output the heating start timing, which is the timing to be performed, and the heating stop timing, which is the timing to stop combustion, to the outside.
Therefore, in the present application, the main body side control unit 95 is connected to the heat source machine side heat output medium temperature (an example of the discharge temperature of the heat medium H) that is the output of the heat output medium temperature sensor 18 via the communication unit 96. In addition to receiving the heating start timing and the heating stop timing, an intermediate value between the heat source machine side output heat medium temperature at the heating start time and the heat source machine output heat medium temperature at the heating stop time is estimated as the low temperature side target temperature. .

  Hereinafter, the control flow of the low temperature side heating operation including the estimation of the low temperature side target temperature will be described based on the control flow of FIG. 8 with reference to the schematic configuration of the cogeneration system of FIGS.

The main body side control unit 95 receives information related to the execution of the low temperature side heating operation from the heat source unit 10 side via the communication unit 96 (# 01).
When receiving information related to the execution of the low temperature heating operation, the main body side control unit 95 receives the information about the low temperature side heating target temperature, which is the target temperature of the low temperature side heating operation, from the heat source device 10 side via the communication unit 96. Then, the heat source machine side output heat medium temperature at the heating start time of the burner 12a and the heat source machine side output heat medium temperature at the heating stop time are received (# 02).

  The main body side control unit 95 estimates that the intermediate value between the heat source unit side heat transfer medium temperature at the heating start timing and the heat source unit side heat transfer medium temperature at the heating stop timing is the low temperature side target temperature (# 03). .

  Hereinafter, the main body side control unit 95 controls the main body side output heat medium temperature so as to approach the low temperature side target temperature, and the amount of heat recovered by the heat medium H in the heating heat exchanger 100 approaches the heating load. In the heating heat exchanger 100, the amount of heat recovered by the heating medium H is controlled by the flow rate of the hot water W passing through the heating heat exchanger 100, and the temperature of the heating medium H is controlled by the heating heat exchanger 100. Control is performed by the flow rate of the passing heat medium H (# 04 to 15). Since this control is the same as # 03 to 14 in FIG. 7 described above except that the high temperature side target temperature is changed to the low temperature side target temperature, detailed description thereof will be omitted here.

(Heating operation by heat storage)
As shown in FIG. 6, the heating operation by heat storage is an operation for supplying heat stored in the hot water storage tank 90 to the heat medium H and supplementing the heat of the heating operation when the combined heat and power supply unit 41 is stopped. is there.
In this heating operation by heat storage, with respect to the hot water W side, in order to maintain the stratified hot water in the hot water storage tank 90, the temperature of the heating heat exchanger 100 for the hot water W is suppressed to a certain level or less, and the heating heat exchanger is maintained. The target is to maintain the flow rate of hot water W passing through 100 below a certain level.
On the other hand, regarding the heat medium H side, the target is to maintain the temperature of the heat medium H at the outlet of the heating heat exchanger 100 at the target temperature.

Hereinafter, the flow of control of the heating operation by the heat storage is shown in FIG. 9 while referring to FIG. 10 showing changes in the temperature state when the flow rates of the hot water W and the heating medium H in the heating heat exchanger 100 are changed. This will be explained based on.
In the heating operation using the heat storage, the target temperature is estimated by the same control as in the low-temperature heating operation. In the control flow according to FIG. 9 below, the target temperature is estimated in advance. The control of

The main body side control unit 95 is configured to allow the hot water W in the upper part 90a of the hot water storage tank 90 to pass through the heating heat exchanger 100 at the minimum flow rate, the rotational speed of the circulation pump 61, the opening degree of the three-way regulating valve 68, and the proportional valve. The opening degree of 71 is controlled.
Further, the main body side control unit 95 controls the rotational speed of the heat medium circulating pump 103 so as to adjust the flow rate of the heat medium H passing through the heating heat exchanger 100 to the minimum flow rate (# 01).

  Thereafter, the system waits for a certain period of time until the temperature state of the hot water W and the heat medium H in the heating heat exchanger 100 reaches a steady state (# 02).

  At this time, even if the main body side heat transfer medium temperature, which is the output temperature of the heat transfer medium H in the heating heat exchanger 100, is equal to or higher than the target temperature, the hot water W passing through the heating heat exchanger 100 Since the flow rate is small, there is a high possibility that the heat medium H is in a state where a lot of heat cannot be recovered (the state shown in FIG. 10B).

  Therefore, when the main body side heat output medium temperature, which is the output temperature of the heat transfer medium H in the heating heat exchanger 100, is equal to or higher than the target temperature (# 03), the heat transfer medium H passing through the heating heat exchanger 100 is increased. When the flow rate does not reach the maximum flow rate (# 04), the flow rate of the heat medium H passing through the heating heat exchanger 100 is increased (states (c, e, g) in FIG. 10) (# 05).

  When the main body side heat output medium temperature, which is the output temperature of the heat medium H in the heating heat exchanger 100, is lower than the target temperature (# 03) by the process of # 05, the heat exchanger 100 for heating is performed. The difference between the temperature at which the hot water W is discharged and the temperature at which the heating medium H enters (hereinafter abbreviated as ΔT) is less than the optimum value α (# 06), and the temperature of the hot water W passing through the heating heat exchanger 100 is When the flow rate does not reach the maximum flow rate (# 07), the flow rate of hot water W passing through the heating heat exchanger 100 is increased (state (f) in FIG. 10) (# 08).

In the process of # 06, the determination that ΔT is less than the optimum value α is that the flow rate of the hot water W passing through the heating heat exchanger 100 becomes larger than necessary, and thus the heating heat exchanger 100 This guarantees that the temperature of the hot water that is discharged is not higher than necessary, and this prevents the hot water from being heated to the lower part 90b of the hot water tank 90 and prevents the stratified hot water in the hot water tank 90 from collapsing. doing.
For this reason, in the process of # 06, when ΔT is equal to or greater than the optimum value α, the flow rate of the hot water W after passing through the heating heat exchanger 100 becomes larger than necessary, and thereby heat exchange for heating is performed. Since it can be determined that the temperature of the hot water coming out of the exchanger 100 may be higher than necessary, the flow rate of the hot water W passing through the heating heat exchanger 100 is decreased (# 09). Thereby, the hot water W is taken out at a flow rate higher than necessary, and the stratification of the hot water storage tank 90 is prevented from collapsing at an early stage.

  The main body side control unit 95 repeats the above-described processes of # 02 to # 09 until the flow rate of the heat medium H passing through the heating heat exchanger 100 and the flow rate of the hot and cold water W become a predetermined flow rate or higher.

Here, in this embodiment, if the flow rate of the heat medium H passing through the heating heat exchanger 100 is excessively increased, the flow rate of the heat medium H passing through the heating heat exchanger 100 is changed to the heating circuit 34. This is not preferable because the total flow rate of the heat medium H returned to the return header 32 is increased and the temperature at which the heat medium H enters the heat exchanger 100 for heating becomes high.
That is, it is preferable that the total flow rate of the heating medium H returned from the heating circulation path 34 to the return header 32 is defined as the maximum flow rate of the heating medium H.
Here, since the total flow rate of the heating medium H returned from the heating circulation path 34 to the return header 32 varies depending on the type and number of heating radiators 33 in the operating state, the heating circulation path 34 returns to the return header 32. It is difficult to know the total flow rate of the returned heating medium H (maximum flow rate of the heating medium H). For this reason, the flow rate of the heating medium H passing through the heating heat exchanger 100 is larger than the total flow rate of the heating medium H returned from the heating circulation path 34 to the return header 32 (maximum flow rate of the heating medium H). It is also difficult to determine whether or not.

Therefore, in the present embodiment, when the heating load is small, that is, when the flow rate of the heat medium returned from the heating circulation path 34 to the return header 32 is small, the above determination is performed by the following processing. To do.
In the process of # 04, the flow rate of the heating medium H passing through the heating heat exchanger 100 is greater than the total flow rate of the heating medium H returned from the heating circuit 34 to the return header 32 (maximum flow rate of the heating medium H). The flow rate when the temperature of the heating medium H passing through the heating heat exchanger 100 does not change even if the flow rate of the heating medium H passing through the heating heat exchanger 100 is increased. Is determined to be the maximum flow rate of the heat medium H.
In other words, when the flow rate of the heat medium H passing through the heating heat exchanger 100 does not change even when the flow rate is increased, the return header 32 out of the heat medium H heated through the heating heat exchanger 100 is used. It is thought that what has been returned is led to the heating heat exchanger 100 side again without being led to the heat source unit 10 side. Therefore, in this case, the heating medium H passing through the heating heat exchanger 100 is equal to or higher than the total flow rate of the heating medium H returned from the heating circulation path 34 to the return header 32 (maximum flow rate of the heating medium H). It is thought that it is.

  As described above, the heat that passes through the heating heat exchanger 100 when the main body side heating medium temperature, which is the temperature of the heating medium H in the heating heat exchanger 100, is equal to or higher than the target temperature (# 03). When the flow rate of the medium H does not change even if the flow rate of the medium H is increased (# 04), the flow rate of the hot water W passing through the heating heat exchanger 100 is decreased in order to reduce the temperature of the heat medium H of the heating heat exchanger 100. Decrease by a predetermined amount (process (i) in FIG. 10) (# 10).

On the other hand, when the heating load is large, the total flow rate of the heating medium H returned from the heating circulation path 34 to the return header 32 is sufficiently larger than the flow rate of the heating medium H passing through the heating heat exchanger 100. For this reason, the flow rate of the heating medium H passing through the heating heat exchanger 100 does not exceed the total flow rate of the heating medium H returned from the heating circulation path 34 to the return header 32.
Therefore, when the heating load is large, even if the flow rate of hot water passing through the heating heat exchanger 100 is increased to the maximum flow rate (# 07), the heat medium in the heating heat exchanger 100 is increased. Since the main body side heat transfer medium temperature, which is the output temperature of H, becomes lower than the target temperature (# 03), in this case, the flow rate of the heat transfer medium H passing through the heating heat exchanger 100 is decreased (# 11). ). As a result, the temperature of the heat medium H passing through the heating heat exchanger 100 (the main body side heat output medium temperature) can be raised to approach the target temperature.

[Second Embodiment]
2nd Embodiment of the cogeneration system 40 which concerns on this invention is described based on drawing.
The second embodiment differs from the first embodiment in the arrangement form of the flow path through which the heat medium H flows, that is, the circulation state of the heat medium H. Hereinafter, changes from the first embodiment will be described, and the same components as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

  In the first embodiment, after the heating medium H returning to the return header 32 is passed through the heating heat exchanger 100 and the heating heat exchanger 100 through the main body side heat medium receiving portion 102a, A configuration of returning to the return header 32 via the main body side heat medium discharge unit 102b was adopted. In the first embodiment, with this configuration, the heating medium H that passes through the heating radiator 33 and flows through the heating circulation path 34 and returns to the return header 32 is taken out, and a predetermined flow rate is passed to the heating heat exchanger 100. Can be made.

On the other hand, in the second embodiment, as shown in FIG. 11, the heat medium H returning to the return header 32 passes through the heating heat exchanger 100 via the main body side heat medium receiving portion 102a, and heat for heating. After passing the exchanger 100, the structure which returns to the heat source machine side heat-medium acceptance part 16a of the heat source machine 10 is employ | adopted via the main body side heat medium discharge part 102b.
In the second embodiment, with this configuration, the entire flow rate of the heating medium H that passes through the heating radiator 33 and flows through the heating circulation path 34 and returns to the return header 32 passes to the heating heat exchanger 100. become.

In the case of adopting such a configuration, the flow rate of the heating medium H flowing through the heating heat exchanger 100 is determined by the heating load (the number of operating and types of the heating radiator 33). Based on the target temperature related information related to the temperature, it becomes impossible to control.
For this reason, in the said 2nd Embodiment, each control of the heating operation by high temperature heating operation, low temperature heating operation, and heat storage differs from the thing of 1st Embodiment. Therefore, hereinafter, control of these operations will be described based on the control flow diagrams of FIGS. 15 to 17 with reference to schematic configuration diagrams of the cogeneration system shown in FIGS.

(High temperature heating operation)
The high-temperature heating operation is a heating operation that is executed when a heating radiator 33 that requires a relatively high temperature, such as a bathroom heating dryer, is operated as shown in the schematic configuration diagrams of FIGS.
In the high temperature heating operation, as shown in the control flow of FIG. 15, the main body side control unit 95 receives information related to the execution of the high temperature heating operation from the heat source unit 10 via the communication unit 96, and based on the information, The circulating state of the hot water W and the circulating state of the heating medium H (fixed flow rate) are controlled.

The main body side control unit 95 receives information that the heating operation is the high temperature heating operation from the heat source unit 10 side via the communication unit 96 (# 01).
When receiving information related to the execution of the high temperature heating operation, the main body side control unit 95 stores the target temperature of the heat medium H in the high temperature heating operation in advance in the high temperature side target temperature (not shown) (not shown). (# 02).

In the cogeneration system 40, the main body side control unit 95 circulates the cooling water C through the cooling water circulation path 42 in order to recover the exhaust heat of the cogeneration unit 41 in a situation where the operation of the cogeneration unit 41 is maintained. Let
The main body side control unit 95 maintains the rotational speed of the cooling water pump 46 at a constant value so as to maintain the circulating flow rate of the cooling water C at a constant level, to the heat recovery heat exchanger 55 disposed in the cooling water circulation path 42. The temperature of the cooling water C is maintained at 75 ° C to 80 ° C.
On the other hand, the main body side control unit 95 controls the opening degree of the three-way regulating valve 68 to maintain the temperature of the hot water W stored in the hot water storage tank 90 at the target hot water storage temperature (75 to 77 ° C.). The flow rate ratio between the flow rate of hot water W guided to the hot water side and the flow rate of hot water W guided to the hot water bypass passage 67 side bypassing the hot water storage tank 90 is controlled (# 03).

  When the main body side heat output medium temperature is lower than the high temperature side target temperature (# 04), the main body side control unit 95 determines that the amount of heat recovered by the heat medium H at this time is smaller than the heating load, and heat for heating Among the flow rates of hot water led to the exchanger 100 and the hot water storage tank 90, the distribution amount of the hot water W to the heating heat exchanger 100 is increased until the distribution amount of the hot water to the heating heat exchanger 100 is maximized. (# 05). Thereby, the amount of heat recovered by the heat medium H increases.

  On the other hand, when the main body side heat transfer medium temperature exceeds the high temperature side target temperature (# 04), the main body side control unit 95 determines that the amount of heat recovered by the heat medium H at this time is larger than the heating load, and for heating Of the flow rate of hot water guided to the heat exchanger 100 and the hot water storage tank 90, the distribution amount of the hot water W to the heating heat exchanger 100 is reduced until the distribution amount of the hot water to the heating heat exchanger 100 is minimized. Decrease (# 06). As a result, the amount of heat recovered by the heat medium H is reduced.

(Low temperature heating operation)
Also in the low-temperature heating operation in the second embodiment, as shown in the schematic configuration of FIGS. 12 and 13, the main body side control unit 95 relates to the target temperature of the heating operation from the heat source unit 10 side via the communication unit 96. As the target temperature-related information, the output of the heat source device side output heat medium temperature (an example of the discharge temperature of the heat medium H), the heating start time, and the heating stop time, which are outputs of the heat output medium temperature sensor 18, are received and the heating start time An intermediate value between the heat source unit side heat transfer medium temperature and the heat source unit side heat transfer medium temperature at the heating stop timing is estimated as the low temperature side target temperature, and the operation state is controlled based on the low temperature side target temperature.

  Hereinafter, the control flow of the low temperature side heating operation including the estimation of the low temperature side target temperature will be described based on the control flow of FIG. 16 with reference to the schematic configuration of the cogeneration system of FIGS.

The main body side control unit 95 receives information related to the execution of the low temperature side heating operation from the heat source unit 10 side via the communication unit 96 (# 01).
When receiving information related to the execution of the low temperature heating operation, the main body side control unit 95 receives the information about the low temperature side heating target temperature, which is the target temperature of the low temperature side heating operation, from the heat source device 10 side via the communication unit 96. Then, the heat source machine side output heat medium temperature at the heating start time of the burner 12a and the heat source machine side output heat medium temperature at the heating stop time are received (# 02).

  The main body side control unit 95 estimates that the intermediate value between the heat source unit side heat transfer medium temperature at the heating start timing and the heat source unit side heat transfer medium temperature at the heating stop timing is the low temperature side target temperature (# 03). .

  Hereinafter, the main body side control unit 95 performs control so that the amount of heat recovered by the heat medium H in the heating heat exchanger 100 approaches the heating load (# 05-07). This control is the same as the above-described control of high temperature heating operation (control shown in FIG. 15) # 04 to 06 except that the high temperature side target temperature is changed to the low temperature side target temperature. I will omit the detailed explanation.

(Heating operation by heat storage)
As shown in FIG. 14, the heating operation by heat storage is an operation for supplying heat stored in the hot water storage tank 90 to the heat medium H and supplementing the heat of the heating operation when the combined heat and power supply unit 41 is stopped. is there.
In the heating operation by the heat storage, the target temperature is estimated by the same control as in the low-temperature heating operation, and the following control flow shows the control after the target temperature is estimated. To do.

  As shown in the control flow of FIG. 17, the main body side control unit 95 minimizes the flow rate of the hot water W passing through the heating heat exchanger 100, the rotational speed of the circulation pump 61, the opening degree of the proportional valve 71, etc. Is controlled (# 01).

  When the temperature on the outlet side of the heat medium H in the heating heat exchanger 100 (main body side heat output medium temperature) is lower than the target temperature (# 02), the main body side controller 95 determines the main body side heat output medium temperature. To increase the flow rate of hot water passing through the heating heat exchanger 100 (# 03).

  When the temperature on the outlet side of the heating medium H in the heating heat exchanger 100 (main body side heating medium temperature) is equal to or higher than the target temperature (# 02), the main body side controller 95 determines the main body side heating medium temperature. Is decreased to the target temperature, the flow rate of hot water passing through the heating heat exchanger 100 is decreased (# 04).

[Another embodiment]
Finally, other embodiments of the present invention will be described. Note that the configuration of each embodiment described below is not limited to being applied independently, and can be applied in combination with the configuration of other embodiments as long as no contradiction arises.
(1) In the above embodiment, the heat source device 10 is configured as a combination of a heater and a water heater so that both the hot water supply operation and the heating operation can be performed. You may comprise as a machine.

(2) In the above embodiment, the hot water extracted from the upper part 90a of the hot water storage tank 90 is provided with the three-way regulating valve 77 that functions as a mixing unit in order to adjust the main body side water temperature to the target water temperature, and performs mixing control. The low-temperature hot water W is mixed with the W with mixing ratio adjustment. For example, the hot water W at the target outlet temperature is stored in the upper layer of the hot water storage tank 90, and the configuration of the mixing unit, etc. May be omitted.

(3) In the above embodiment, the hot water storage tank 90 is a sealed tank configured to store the hot water W heated in a form that forms temperature stratification. However, the hot water storage tank 90 may be an open tank or may be heated. You may comprise so that only the performed hot water W may be stored.

(4) In the above embodiment, the combined heat and power supply unit 41, the hot water storage tank 90, and other various parts arranged in parallel with the heat source device 10 are arranged in one housing and configured integrally. It may be distributed to each of the body and consist of a plurality of units.

(5) When the type of the low temperature heating operation (hot dash operation, normal low temperature heating operation, low temperature floor heating operation, etc.) is changed during the low temperature heating operation of the first embodiment and the second embodiment, the low temperature side target The temperature will also be changed. And when the said change is a change from a driving | operation with a high low temperature side target temperature to a low driving | operation, in the heat source machine 10, the heating of the burner 12a is stopped.
At this time, the main body control unit 95 cannot receive the information of the heating start timing and the stop timing via the communication unit 96, and cannot estimate the target temperature.
Therefore, in the low temperature heating operation of the first embodiment and the second embodiment, it is preferable to configure as follows.
That is, when the non-heating time, which is the time during which the heating medium H is not heated by the burner 12a of the heat source device 10, exceeds the non-heating determination elapsed time (for example, about 20 minutes), It is preferable to configure so as to determine that the temperature has been changed to the lower side.
When the main body side control unit 95 determines that the target temperature has been changed to the lower side, the flow rate of the hot water W passing through the heating heat exchanger 100 for a predetermined time is set to the lowest flow rate (including zero flow rate). The control such as setting to is executed.

(6) In the first embodiment and the second embodiment described above, the main body side control unit 95 can acquire information capable of determining the high temperature heating operation and the low temperature heating operation from the heat source device 10 via the communication unit 96. showed that.
However, even when the main body side control unit 95 cannot receive the information for determining the high temperature side heating operation and the low temperature side heating operation, it is shown in the low temperature heating operation of the first embodiment and the second embodiment. By executing the control for estimating the target temperature, a cogeneration system with high energy efficiency can be realized.

(7) In the above embodiment, the main body control unit 95 may directly receive the target temperature as the target temperature related information via the communication unit 96.

(8) In the low temperature heating operation, the main body side control unit 95 stores the target temperature in a storage unit (not shown), and the main body side control unit 95 performs the low temperature heating operation via the communication unit 96. It may be configured to determine that the target temperature is any one of a plurality of low temperature side target temperatures stored in the storage unit when the information indicating the operation is received.

  INDUSTRIAL APPLICABILITY The present invention is suitable as a cogeneration system in which a heat source device for heating a heat medium circulated to a heating radiator is provided in the main body, and a heating facility provided with the cogeneration system, as a system that improves the thermal efficiency of the entire system. Is available.

10: Heat source machine 16a: Heat source machine side heat medium receiving part 16b: Heat source machine side heat medium discharge part 33: Heating radiator 34: Heating circuit 40: Cogeneration system 41: Combined heat and power supply part 55: Exhaust heat recovery heat exchange Unit 56: Waste heat heating heat exchanger 60: Heated hot water storage circuit 90: Hot water storage tank 95: Main body side control unit 96: Communication unit 100: Heat exchanger for heating 101: Heat medium channel 102a: Main body side heat medium receiving unit 102b: Main body side heat medium discharge part H: Heat medium W: Hot water

Claims (15)

The heat medium received from the heat source unit side heat medium receiving part is heated to a preset heating air heating medium temperature, and the heated heat medium is discharged from the heat source unit side heat medium discharge part and heated in the heating circulation path. It is attached to the heat source machine that can perform the heating operation leading to the radiator,
A cogeneration unit that generates electric power and heat;
A hot water storage tank for storing hot water heated by heat generated in the combined heat and power unit;
Circulating hot water to an exhaust heat recovery heat exchanger that recovers the heat generated in the combined heat and power supply section, and circulating the hot water to the hot water storage tank;
In the heating circuit, between the main body side heat medium receiving part that receives the heat medium after passing through the heating radiator and the main body side heat medium receiving part connected to the heat source unit side heat medium receiving part. A heat medium flow path through which the heat medium flows,
A heat exchanger for heating that exchanges heat between the hot water flowing through the hot water circulation path and the heat medium flowing through the heat medium flow path;
A cogeneration system including a main body side control unit for controlling operation,
A communication unit communicating with the heat source unit;
The main body side control unit receives the target temperature related information related to the target temperature of the discharge temperature of the heat medium discharged from the heat source unit side heat medium discharge unit in the heating operation via the communication unit, and the target temperature A cogeneration system that executes hot water circulation state control for controlling a hot water circulation state in which hot water is circulated through the heating heat exchanger in the hot water circulation path based on related information.   The cogeneration system according to claim 1, wherein the heating circulation path is provided with a main body side heat medium flow path that guides the entire amount of the circulating heat medium to the heating heat exchanger on the main body side.   The heating circuit is provided with a main body side heat medium flow path that takes out a predetermined flow rate from the circulating heat medium and returns it to the circulating heat medium after being led to the heating heat exchanger on the main body side. The described cogeneration system.   Heat medium flow state control for fixing a flow rate of the heat medium that takes out a predetermined flow rate from the circulating heat medium and leads to the heating heat exchanger on the main body side to be equal to or higher than a total circulation flow rate of the heat medium circulating in the heating radiator The cogeneration system according to claim 3, further comprising means.   The cogeneration system according to claim 3, further comprising a heat medium flow state control unit that variably controls a flow rate of the heat medium that takes out a predetermined flow rate from the circulating heat medium and guides it to the heating heat exchanger on the main body side. The heat medium flow state control means is:
When the discharge temperature of the heat medium discharged from the main body side heat medium discharge portion is lower than the target temperature, the heat medium flow rate leading to the heating heat exchanger on the main body side is decreased,
The cogeneration system according to claim 5, wherein when the discharge temperature of the heat medium discharged from the main body side heat medium discharge unit exceeds the target temperature, the flow rate of the heat medium led to the heating heat exchanger on the main body side is increased. . The hot water circulation path is disposed so that a part of hot water whose exhaust heat has been recovered by the exhaust heat recovery heat exchanger is stored in the hot water storage tank and the other part can be passed to the heating heat exchanger. And
As the hot water circulation state control, a hot water flow rate ratio control means capable of adjusting a flow rate ratio between a hot water flow rate stored in the hot water storage tank and a hot water flow rate passing through the heating heat exchanger is provided,
When the discharge temperature of the heat medium discharged from the main body side heat medium discharge unit is lower than the target temperature, the hot water flow rate control means reduces the flow rate of hot water stored in the hot water storage tank, and the heating heat Increase the flow rate of hot water passing through the exchanger,
When the discharge temperature of the heat medium discharged from the main body side heat medium discharge unit exceeds the target temperature, the hot water flow rate ratio control means increases the flow rate of hot water stored in the hot water storage tank, and the heating heat The cogeneration system according to any one of claims 1 to 6, wherein the flow rate of hot water passing through the exchanger is reduced.   The said main body side control part receives the information that the said heating operation is either a low temperature heating operation or a high temperature heating operation as the said target temperature relevant information via the said communication part. The cogeneration system according to one item. When the main body side control unit receives information that the heating operation is a high temperature heating operation as the target temperature related information via the communication unit,
9. The code according to claim 8, wherein the main body side control unit directly receives the high temperature side target temperature as the target temperature related information, or determines that the target temperature is a high temperature side target temperature stored in advance. Generation system. The heating operation starts heating at a temperature at which a discharge temperature of the heat medium discharged from the heat source unit side heat medium discharge unit is lower than the target temperature by a predetermined temperature, and heat discharged from the heat source unit side heat medium discharge unit It is an ON-OFF control operation in which heating is stopped at a temperature at which the discharge temperature of the medium is higher than the target temperature by a predetermined temperature,
When the main body side control unit receives the information that the heating operation is the low temperature heating operation as the target temperature related information via the communication unit, the heat source machine side heat medium as the target temperature related information Received by adding the discharge temperature of the heat medium discharged from the discharge unit, the heating start timing and the heating stop timing in the heat source unit, and the target temperature is discharged from the heat source unit side heat medium discharge unit at the heating start timing The cogeneration system according to claim 8, wherein the cogeneration system is estimated to be a temperature between a discharge temperature of the heat medium that has been discharged and a discharge temperature of the heat medium discharged from the heat source unit side heat medium discharge unit at the heating stop timing. . When the main body side control unit acquires information that the heating operation is the low temperature heating operation as the target temperature related information via the communication unit,
The main body side control unit directly receives the low temperature side target temperature as the target temperature related information, or determines that the target temperature is one of a plurality of low temperature side target temperatures stored in advance. Item 11. The cogeneration system according to Item 8 or 10.   The said main body side control part determines with the said target temperature having been changed to the low side, when the non-heating time which is a time when a heat medium is not heated with the said heat source machine exceeds the non-heating determination elapsed time. Or the cogeneration system of 11. When the combined heat and power unit is stopped,
The cogeneration system according to any one of claims 1 to 12, wherein hot water stored in the hot water storage tank is caused to flow to the heating heat exchanger by the hot water circulation state control.   The cogeneration system as described in any one of Claims 1-13 comprised by the integrated type which has arrange | positioned various site | parts in the one housing | casing adjoined to the said heat-source equipment. A heating facility comprising the cogeneration system according to any one of claims 1 to 14,
The heating facility which has connected the said cogeneration system and the said heat-source machine via the said heating circulation path which circulates a heat medium between each other.

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