JP6495396B2 - Cogeneration system - Google Patents

Description

  The present invention relates to a cogeneration system that heats hot water in a hot water storage tank using heat discharged from a power generation device.

  The cogeneration system is generally divided into a power generation unit having a power generation device and a hot water storage unit having a hot water storage tank, and heats hot water in the hot water storage tank using heat discharged from the power generation device.

For example, the system described in Patent Document 1 is a fuel cell cogeneration system using a fuel cell as a power generation device, and the power generation unit and the hot water storage unit are connected via a hot water circulation circuit.
That is, the hot water taken out from the low temperature part of the hot water storage tank on the hot water storage unit side is sent to the heat exchanger on the power generation unit side through the radiator, and the heat discharged from the fuel cell is recovered. The hot water recovered from the exhaust heat is returned to the hot water storage tank on the hot water storage unit side so that hot water can be supplied. The radiator is activated when the amount of heat stored in the hot water storage tank becomes full, etc., and dissipates excess heat to the atmosphere to enable power generation operation.

Further, in the system described in Patent Document 2, the power generation unit and the hot water storage unit are connected via a heat medium circulation circuit in order to transfer the heat discharged from the fuel cell to the hot water in the hot water storage tank via the heat medium. It is connected.
That is, the heat medium becomes high temperature by heat exchange with the exhaust heat from the fuel cell on the power generation unit side, and then sent to the hot water storage unit side. The heat medium becomes low temperature by heat exchange with the hot water in the hot water storage tank on the hot water storage unit side, and is sent again to the power generation unit side through the radiator.

JP 2010-205631 A JP 2012-209173 A

  However, as described in Patent Document 1, in the direct heating method in which hot water is circulated and the hot water is directly heated by exhaust heat, when there is no water in the hot water storage tank due to water breakage or the like, the fuel cell Since the exhaust heat cannot be dissipated, the power generation operation must be stopped. The same applies to the case where circulation of hot water becomes difficult due to a power failure at the hot water storage unit due to a power failure or the like.

  In this respect, as described in Patent Document 2, in the indirect heating method in which the heating medium is circulated and the hot water is indirectly heated by exhaust heat through the heating medium, water in the hot water storage tank is lost due to water cut or the like. However, the heat medium can be circulated and heat can be dissipated by the radiator, and power generation is not stopped.

  However, when it becomes necessary to separate the power generation unit and the hot water storage unit when the hot water storage unit is repaired or exchanged, inconvenience that the user cannot use hot water occurs.

  In view of such a situation, an object of the present invention is to provide a cogeneration system in which a user can use hot water even when a hot water storage tank (hot water storage unit) is repaired or replaced.

In order to solve the above problems, the cogeneration system according to the present invention is:
A water inlet passage for allowing tap water to flow into the hot water storage tank;
A mixing section for mixing hot water from the hot water storage tank and tap water from the middle of the water passage,
A hot water supply device having a heating source inside and capable of supplying hot water by heating hot water from the mixing section;
A mixing unit bypass device that bypasses the mixing unit and can supply tap water from the middle of the water passage to the hot water supply device;
Including
The mixing unit bypass device includes a first branch portion provided in the middle of the water inlet passage, a second branch portion provided in a hot water passage from the mixing portion to the hot water supply device, and the first and first And a bypass pipe connecting the two branch parts ,
The first and second branch portions are three-way switching valves .

In addition, the above cogeneration system
It is desirable that the bypass pipe is detachable.

In addition, the above cogeneration system
A heating medium circulation circuit having a circulation pump and an expansion tank on the circuit to circulate the heating medium;
A heat exchanger for exhaust heat recovery that performs heat exchange between the exhaust heat from the power generator and the heat medium at one position of the heat medium circulation circuit;
A hot water heating heat exchanger for exchanging heat between hot water in the hot water storage tank and the heat medium at another position of the heat medium circulation circuit;
A radiator capable of dissipating the heat medium between the outlet side of the hot water heating heat exchanger and the inlet side of the exhaust heat recovery heat exchanger in the heating medium circulation circuit,
A circulation circuit bypass device capable of circulating the heat medium by bypassing the hot water heating heat exchanger in the heat medium circulation circuit;
It is desirable to further include.

  The cogeneration system is divided into a power generation unit, a hot water storage unit, and a hot water supply unit, and the power generation unit includes at least the circulation pump, the expansion tank, the exhaust heat recovery heat exchanger, and the radiator. Preferably, the hot water storage unit includes at least the hot water storage tank, the hot water heating heat exchanger, and the mixing unit, and the hot water supply unit includes at least the hot water supply device. The power generation unit, the hot water storage unit, and the hot water supply unit are preferably connected to a power source without passing through each other.

  In the cogeneration system according to the present invention, the mixing section bypass device is used so that hot water can be supplied, so that the user can use hot water even when the hot water storage tank is repaired or replaced.

  In addition, since the bypass pipe is configured to be detachable, the bypass pipe can be attached and switched by bypass only when necessary, such as during repair.

  Further, by using the circulation circuit bypass device, the heat medium circulation circuit is configured to bypass the hot water heating heat exchanger on the hot water tank side, so that the power generator alone can be used even when the hot water tank is repaired or replaced. Can be operated. Therefore, the power generation operation can be continued in various situations.

  In addition, since the power generation unit, the hot water storage unit, and the hot water supply unit are connected to the power source without going through each other, the power generation unit and the hot water supply unit are respectively replaced when the hot water storage unit is repaired or replaced. It can be operated to continue power generation and hot water supply.

Schematic of a fuel cell cogeneration system showing an embodiment of the present invention Schematic diagram of fuel cell cogeneration system when divided into units Schematic diagram showing the power supply configuration when divided into units

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a schematic diagram of a fuel cell cogeneration system showing an embodiment of the present invention.

The fuel cell cogeneration system is a combined heat and power system that generates power using a fuel cell and collects heat generated by power generation and uses it for hot water supply.
Specifically, the fuel cell cogeneration system includes a fuel cell 1, a hot water storage tank 2, a hot water supply device 3, and the like.

The fuel cell 1 is an assembly of a large number of fuel cells, and generates electricity by reacting a hydrogen-containing gas and an oxidant gas. In addition, although the fuel cell 1 depends on the fuel used, a fuel reformer or the like is provided separately from the fuel cell 1 or integrally as a module, but is not illustrated.
From the fuel cell 1, an exhaust heat passage 4 for exhausting heat generated with power generation is derived. Therefore, the exhaust heat of the fuel cell 1 is recovered from the exhaust heat passage 4 by a heat exchanger 8 described later.

The exhaust heat passage 4 in FIG. 1 is shown as a coolant circulation circuit for cooling the fuel cell 1. As the fuel cell 1, for example, a polymer electrolyte fuel cell can be used.
In this case, heat generated in the fuel cell 1 due to power generation is discharged outside the fuel cell 1 by the cooling water flowing through the cooling water circulation circuit 4. Accordingly, the exhaust heat of the fuel cell 1 is recovered from the cooling water that has become a high temperature by cooling the fuel cell 1 by the heat exchanger 8 described later. The cooling water after heat recovery is returned to the fuel cell 1 again.

  The hot water storage tank 2 stores hot water heated using the exhaust heat of the fuel cell 1 and supplies hot water from the upper side. The storage tank 2 is appropriately supplemented with tap water to the bottom side.

In order to transmit the exhaust heat of the fuel cell 1 to the hot water in the hot water storage tank 2, a heat medium circulation circuit 5 is provided across these.
The heat medium circulation circuit 5 has an electric circulation pump 6 and an expansion tank 7 on the circuit to circulate the heat medium.

  An exhaust heat recovery heat exchanger 8 is provided at one position of the heat medium circulation circuit 5 (position on the fuel cell 1 side). The heat exchanger 8 for exhaust heat recovery performs heat exchange between the exhaust heat from the fuel cell 1 and the heat medium. Specifically, the heat exchanger 8 for exhaust heat recovery includes a heat medium passage 5 a that constitutes a part of the heat medium circulation circuit 5 and that is in thermal contact with a part of the heat exhaust passage 4 from the fuel cell 1. Consists of.

  A hot water heating heat exchanger 9 is provided at another position of the heat medium circulation circuit 5 (position on the hot water storage tank 2 side). The hot water heating heat exchanger 9 performs heat exchange between the hot water in the hot water storage tank 2 and the heat medium. Specifically, the hot water heating heat exchanger 9 constitutes a part of the heat medium circulation circuit 5 and penetrates the hot water storage tank 2 so as to be in thermal contact with the hot water in the hot water storage tank 2. It is comprised including.

  A radiator (radiator) 10 having an electric cooling fan 10 a is provided between the outlet side of the hot water heating heat exchanger 9 and the inlet side of the exhaust heat recovery heat exchanger 8 in the heat medium circulation passage 5. It is done.

  In this embodiment, the circulation pump 6 and the expansion tank 7 are arranged between the hot water heating heat exchanger 9 and the radiator 10. However, the present invention is not limited to this. If there is, it can be provided at an arbitrary position. However, in consideration of heat resistance, the circulation pump 6 is preferably disposed between the outlet side of the hot water heating heat exchanger 9 and the inlet side of the exhaust heat recovery heat exchanger 8 as shown in the figure. Further, when importance is attached to the heat resistance of the circulation pump 6, the circulation pump 6 may be arranged not on the upstream side of the radiator 10 but on the downstream side.

The heat medium circulation circuit 5 is also provided with a circulation circuit bypass device 11 that can bypass the hot water heating heat exchanger 9 and circulate the heat medium.
In this embodiment, the circulation circuit bypass device 11 includes a first three-way switching valve 11a provided as a first branch on the inlet side of the hot water heating heat exchanger 9 in the heat medium circulation circuit 5, and a heat medium circulation circuit. 5, a second three-way switching valve 11b provided as a second branch on the outlet side of the hot water heating heat exchanger 9, and a bypass pipe connected between the first and second three-way switching valves 11a and 11b 11c. The bypass pipe 11c may be permanently installed or may be attached only when necessary so as to be detachable.

From the hot water storage tank 2, hot water extraction passage 12 is led out to extract hot water from its upper part.
The hot water storage tank 2 is connected with a water inlet passage 14 from a water inlet 13 for supplying tap water to the bottom side thereof. A water branch passage 15 is branched from the middle of the water inlet passage 14.

The hot water extraction passage 12 and the water branch passage 15 are connected to a mixing valve 16 as a mixing portion.
The mixing valve 16 mixes the hot water from the hot water storage tank 2 with the tap water from the middle of the incoming water passage 14 and outputs it to the hot water supply passage 17. The mixing valve 16 is electrically operated, can adjust the mixing ratio of hot water and water, and is adjusted according to the set hot water temperature.

The hot water supply passage 17 leads to the hot water supply port 18, and the hot water supply device 3 is provided in the middle thereof.
The hot water supply device 3 has a heating source for auxiliary heating, and can supply hot water by heating the hot water when the hot water temperature is lower than the set hot water temperature.

  A mixing section bypass that bypasses a mixing valve 16 serving as a mixing section between the incoming water passage 14 and the hot water supply passage 17 and can supply tap water from the middle of the incoming water passage 14 to the hot water supply device 3. A device 19 is provided.

  In the present embodiment, the mixing unit bypass device 19 is secondly connected to the first three-way switching valve 19a provided as a first branching portion in the water passage 14 and the hot water supply passage 17 from the mixing valve 16 to the hot water supply device 3. And a bypass pipe 19c connected between the first and second three-way switching valves 19a and 19b. The bypass pipe 19c may be installed permanently or may be attached only when necessary so that it can be attached and detached.

Next, the operation of this embodiment will be described.
During normal operation, the exhaust heat of the fuel cell 1 is recovered by the exhaust heat recovery heat exchanger 8. The heat medium in the heat medium circulation circuit 5 is heated to high temperature by heat exchange in the exhaust heat recovery heat exchanger 8, and then the hot water in the hot water storage tank 2 is heated in the hot water heating heat exchanger 9. Thereafter, the heat medium passes through the expansion tank 7, the circulation pump 6, and the radiator 10 and returns to the heat exchanger 8 for exhaust heat recovery again.
When the heat storage amount in the hot water storage tank 2 becomes full, the radiator 10 operates the cooling fan 10a to dissipate excess heat to the atmosphere and continue cooling the fuel cell 1 to generate power. Is possible.

  When hot water is supplied, hot water in the hot water storage tank 2 is supplied from the hot water extraction passage 12 to the mixing valve 16. Then, in accordance with the set hot water temperature, the mixing valve 16 mixes with tap water from the middle of the water inlet passage 14 and supplies the hot water supply device 3 through the hot water supply passage 17. The hot water supply device 3 has a heating source, and heats hot water to supply hot water when the hot water temperature is lower than the set hot water temperature.

Next, repairing and replacing the hot water storage tank 2 will be described.
At this time, the bypass device 11 of the heat medium circulation circuit 5 is operated. Specifically, the first and second three-way switching valves 11a and 11b are switched to the bypass position. When the bypass pipe 11c is detachable, the first and second three-way switching valves 11a and 11b are switched to the bypass position after the bypass pipe 11c is mounted.
Thereby, the heat medium of the heat medium circulation circuit 5 is the heat exchanger 8 for exhaust heat recovery, the first three-way switching valve 11a, the bypass pipe 11c, the second three-way switching valve 11b, the expansion tank 7, the circulation pump 6, And it circulates through the radiator 10 and bypasses the hot water heating heat exchanger 9 on the hot water storage tank 2 side.
Then, by operating the cooling fan 10a of the radiator 10, the exhaust heat recovered from the fuel cell 1 is dissipated to the atmosphere, and the cooling of the fuel cell 1 is continued, so that the power generation operation can be continued.
For this reason, even if it takes several days to repair and replace the hot water storage tank 2, the power generation operation during that time can be performed.

On the other hand, hot water supply by the hot water supply device 3 becomes possible by operating the mixing unit bypass device 19. Specifically, the first and second three-way switching valves 19a and 19b are switched to the bypass position. When the bypass pipe 19c is detachable, the first and second three-way switching valves 19a and 19b are switched to the bypass position after the bypass pipe 19c is mounted.
Thereby, the tap water from the water inlet 13 is supplied to the hot water supply device 3 through the first three-way switching valve 19a, the bypass pipe 19c, and the second three-way switching valve 19b from the middle of the water inlet passage 14 and mixed. Bypass the valve 16.
Since the hot water supply device 3 has a heating source, it can supply water by heating water.

Therefore, when the hot water storage tank 2 is repaired and replaced, water is supplied to the hot water supply device 3 via the mixing unit bypass device 19, whereby water can be heated in the hot water supply device 3 to supply hot water.
For this reason, even if it takes several days to repair and replace the hot water storage tank 2, hot water can be supplied during that time. Therefore, the inconvenience that the user cannot use hot water can be solved.

  As described above, in the fuel cell cogeneration system of the present embodiment, the circulation circuit bypass device 11 is used to bypass the heat medium circulation circuit 5 and the hot water heating heat exchanger 9 on the hot water storage tank 2 side. By doing so, even when the hot water storage tank 2 is repaired or replaced, the fuel cell 1 can be operated alone. Therefore, the power generation operation can be continued in various situations.

  In addition, according to the present embodiment, the inlet passage 14 for flowing tap water into the hot water storage tank 2, the mixing valve 12 as a mixing unit for mixing the hot water from the hot water storage tank 2 and tap water from the middle of the inlet passage 14, , A hot water supply device 3 that has a heating source inside and can supply hot water by heating hot water from the mixing valve 12, and a mixing device that bypasses the mixing valve 12 and can supply tap water from the middle of the inlet passage 14 to the hot water supply device 3 By providing the section bypass device 19, the user can use hot water when the hot water storage tank 2 is repaired or replaced.

  Further, according to the present embodiment, the circulation circuit bypass device 11 includes the three-way switching valve 11a as the first branch portion provided on the inlet side of the hot water heating heat exchanger 9 in the heat medium circulation circuit 5, and the heat medium. A three-way switching valve 11b as a second branch portion provided on the outlet side of the hot water heating heat exchanger 9 in the circulation circuit 5 and a bypass pipe 11c connecting the first and second three-way switching valves 11a and 11b. By including the bypass pipe 11c so as to be detachable, a service person or the like can attach the bypass pipe 11c and perform bypass switching only when necessary such as during repair.

  Moreover, according to this embodiment, the mixing part bypass device 19 is a hot water supply apparatus from the 1st three-way switching valve 19a as a 1st branch part provided in the middle of the water intake path 14, and the mixing valve 16 as a mixing part. And a bypass pipe 19c connecting the first and second three-way switching valves 19a and 19b as a second branching portion provided in a hot water passage (hot water supply passage) 17 to 3 By including the bypass pipe 19c in a detachable manner, it is possible for a serviceman or the like to attach the bypass pipe 19c and perform bypass switching only when necessary such as during repair.

FIG. 2 is a schematic diagram of a fuel cell cogeneration system showing another embodiment of the present invention, particularly an embodiment in which units are divided. As the fuel cell 1, for example, a solid oxide fuel cell can be used.
The difference from FIG. 1 other than the unit division is an exhaust heat passage 4 ′.

The exhaust heat passage 4 ′ in FIG. 2 is shown as an exhaust gas passage from the fuel cell 1.
Heat generated in the fuel cell 1 due to power generation and / or off-gas combustion exhaust gas that has not contributed to the power generation of the fuel cell 1 is discharged out of the fuel cell 1 as exhaust gas of the fuel cell 1. The exhaust heat of the fuel cell 1 is recovered from the exhaust gas by the heat exchanger 8. When heat recovery is performed from exhaust gas, pure water used in a reforming reaction or the like for condensing moisture in the exhaust gas and generating a hydrogen-containing gas necessary for power generation is recovered. In the embodiment of FIG. 2 as well, when the amount of heat stored in the hot water storage tank 2 becomes full or when the hot water storage tank 2 is repaired or replaced, the excess heat is radiated to the atmosphere to cool the exhaust gas of the fuel cell 1. The power generation operation can be continued.

Next, unit division will be described.
The fuel cell system of this embodiment is divided into a power generation unit 100, a hot water storage unit 200, and a hot water supply unit 300. The power generation unit 100 mainly stores the fuel cell 1, and the hot water storage unit 200 mainly stores the hot water storage tank 2. The hot water supply unit 300 includes a hot water supply device 3.

The heat medium circulation circuit 5 is provided across the power generation unit 100 and the hot water storage unit 200.
Here, the circulation pump 6, the expansion tank 7, the exhaust heat recovery heat exchanger 8 and the radiator 10 disposed in the heat medium circulation circuit 5 are accommodated in the power generation unit 100.
On the other hand, since the hot water recovery heat exchanger 9 is provided in the hot water storage tank 2, it is naturally stored in the hot water storage unit 200.
The circulation circuit bypass device 11 is disposed not on the hot water storage unit 200 side but on the power generation unit 100 side.
Therefore, the power generation unit 100 includes the circulation pump 6, the expansion tank 7, the exhaust heat recovery heat exchanger 8, the radiator 10, and the circulation circuit bypass device 11.

The mixing valve 16 is disposed in the hot water storage unit 200.
Accordingly, the hot water storage unit 200 includes the hot water storage tank 2, the hot water recovery heat exchanger 9, and the mixing valve 16.
The mixing section bypass device 19 is arranged not on the hot water storage unit 200 side but on the hot water supply unit 300 side.
Therefore, the hot water supply unit 300 includes the hot water supply device 3 and the mixing unit bypass device 19.

Next, the power supply configuration when the units are divided as described above will be described with reference to FIG.
The power generation unit 100, the hot water storage unit 200, and the hot water supply unit 300 are connected to the system power supply 500 without passing through each other. The same applies to the load 400, and the load 400 is connected to the system power supply 500 without going through the power generation unit 100, the hot water storage unit 200, and the hot water supply unit 300.

In addition to the fuel cell 1, a power conditioner (PCS) 101 and various auxiliary machines 102 are housed in the power generation unit 100. The power conditioner 101 has a function of converting DC power from the fuel cell 1 into AC power and outputting the AC power. Examples of the auxiliary machine 102 include an electric fuel supply pump and an oxidant supply pump.
The output line of the power conditioner 101 is connected to the auxiliary machine 102 in the power generation unit 100, and is connected to the system power supply 500 outside the power generation unit 100.
Therefore, the auxiliary machine 102 can be driven by the generated power from the power conditioner 101 or the system power from the system power source 500.

A power supply line of the hot water storage unit 200 is connected to a connecting portion between the system power supply 500 and the power conditioner 101.
Therefore, while the hot water storage unit 200 is supplied with power from the power generation unit 100, it can be supplied from the system power source 500 when it is insufficient or when the power generation unit 100 is stopped.

The power supply line of the hot water supply unit 300 is connected to a connecting portion between the system power supply 500 and the power conditioner 101.
Accordingly, the hot water supply unit 300 is supplied with power from the power generation unit 100, but can be supplied from the system power supply 500 when it is insufficient or when the power generation unit 100 is stopped.

The power lines of the various loads 400 are also connected to a connecting portion between the system power supply 500 and the power conditioner 101.
Accordingly, power is supplied from the power generation unit 100 to the load 400, but can be supplied from the system power supply 500 when the power generation unit 100 is insufficient or when the power generation unit 100 is stopped.

  According to this embodiment, the fuel cell cogeneration system is divided into a power generation unit 100, a hot water storage unit 200, and a hot water supply unit 300, and the power generation unit 100 includes at least the circulation pump 6, the expansion tank 7, and the exhaust heat recovery unit. The hot water storage unit 200 includes at least a hot water storage tank 2, a hot water heating heat exchanger 9, and a mixing valve (mixing unit) 16, and the hot water supply unit 300 includes at least hot water supply. Since the power generation unit 100, the hot water storage unit 200, and the hot water supply unit 300 are connected to the power source without passing through each other, the power generation unit 100 and the hot water supply unit 300 are included in the repair and replacement of the hot water storage unit 200. It can be operated to continue power generation and hot water supply.

Further, according to the present embodiment, since the power generation unit 100 further includes the circulation circuit bypass device 11, when the hot water storage unit 200 is repaired and replaced, it is easy to configure the heat medium circulation circuit by the power generation unit 100 alone. Become.
However, the circulation circuit bypass device 11 may not be disposed in the hot water storage unit 200 but may be disposed outside the hot water storage unit 200, that is, between the power generation unit 100 and the hot water storage unit 200.

In addition, according to the present embodiment, the hot water supply unit 300 further includes the mixing unit bypass device 19, so that it is easy to provide a configuration in which hot water supply unit 300 can supply hot water when the hot water storage unit 200 is repaired and replaced. .
However, the mixing section bypass device 19 may not be disposed in the hot water storage unit 200 but may be disposed outside the hot water storage unit 200, that is, between the hot water storage unit 200 and the hot water supply unit 300.

  Although the fuel cell cogeneration system using the fuel cell as the power generation device has been described above, the present invention is not limited to this, and can be applied to general cogeneration systems.

  The illustrated embodiments are merely examples of the present invention, and the present invention is not limited to those directly described by the described embodiments, and various improvements and modifications made by those skilled in the art within the scope of the claims. Needless to say, it encompasses changes.

DESCRIPTION OF SYMBOLS 1 Fuel cell 2 Hot water storage tank 3 Hot-water supply apparatus 4 Cooling water circulation circuit (exhaust heat passage)
4 'exhaust gas passage (exhaust heat passage)
DESCRIPTION OF SYMBOLS 5 Heat-medium circulation circuit 5a, 5b Heat-medium channel | path 6 Circulation pump 7 Expansion tank 8 Heat exchanger for exhaust heat recovery 9 Heat exchanger 10 for hot water heating Heat radiator 10a Cooling fan 11 Circulation circuit bypass device 11a, 11b Three-way switching valve 11c Bypass piping 12 Hot water outlet passage 13 Water inlet 14 Water inlet passage 15 Water branch passage 16 Mixing valve (mixing section)
17 Hot water supply passage 18 Hot water supply port 19 Mixing unit bypass devices 19a and 19b Three-way switching valve 19c Bypass piping 100 Power generation unit 101 Power conditioner 102 Auxiliary machine 200 Hot water storage unit 300 Hot water supply unit 400 Load 500 System power supply

Claims (6)

A cogeneration system that heats hot water in a hot water storage tank using heat discharged from a power generation device,
A water inlet passage for allowing tap water to flow into the hot water storage tank;
A mixing section for mixing hot water from the hot water storage tank and tap water from the middle of the water passage,
A hot water supply device having a heating source inside and capable of supplying hot water by heating hot water from the mixing section;
A mixing unit bypass device that bypasses the mixing unit and can supply tap water from the middle of the water passage to the hot water supply device;
Including
The mixing unit bypass device includes a first branch portion provided in the middle of the water inlet passage, a second branch portion provided in a hot water passage from the mixing portion to the hot water supply device, and the first and first And a bypass pipe connecting the two branch parts ,
The cogeneration system, wherein the first and second branch portions are three-way switching valves .   The cogeneration system according to claim 1, wherein the bypass pipe is configured to be detachable. A heating medium circulation circuit having a circulation pump and an expansion tank on the circuit to circulate the heating medium;
A heat exchanger for exhaust heat recovery that performs heat exchange between the exhaust heat from the power generator and the heat medium at one position of the heat medium circulation circuit;
A hot water heating heat exchanger for exchanging heat between hot water in the hot water storage tank and the heat medium at another position of the heat medium circulation circuit;
A radiator capable of dissipating the heat medium between the outlet side of the hot water heating heat exchanger and the inlet side of the exhaust heat recovery heat exchanger in the heating medium circulation circuit,
A circulation circuit bypass device capable of circulating the heat medium by bypassing the hot water heating heat exchanger in the heat medium circulation circuit;
The cogeneration system according to claim 1 or 2, further comprising: The cogeneration system is divided into a power generation unit, a hot water storage unit, and a hot water supply unit,
The power generation unit includes at least the circulation pump, the expansion tank, the exhaust heat recovery heat exchanger, and the radiator.
The hot water storage unit includes at least the hot water storage tank, the hot water heating heat exchanger, and the mixing unit.
The hot water supply unit includes at least the hot water supply device,
The cogeneration system according to claim 3, wherein the power generation unit, the hot water storage unit, and the hot water supply unit are connected to a power source without passing through each other.   The cogeneration system according to claim 4, wherein the power generation unit further includes the circulation circuit bypass device.   The cogeneration system according to claim 4 or 5, wherein the hot water supply unit further includes the mixing unit bypass device.

Images