JP2006169971A - Rankine system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a Rankine system capable of respectively efficiently using heat of a working fluid for power generation and heating of hot water of a hot water storage tank. <P>SOLUTION: Since heating air is heated by the working fluid flowing in a second heat exchanger 8 by making the working fluid flowing out of a motive power generator 2 flow to the second heat exchanger 8 of a bypass passage 7 by switching a flow passage by a three-way valve 7a, the heating air can be heated without making the working fluid flow to a condenser 3 when generating electric power and performing heating, and the heat of the working fluid can be respectively efficiently used for power generation and heating. In that case, since the heat is exchanged between the working fluid flowing out of the motive power generator 2 and the working fluid flowing in the evaporator 1 side by a first heat exchanger 6, a low temperature working fluid flowing in the evaporator 1 side can be heated by the high temperature working fluid flowing out of the motive power generator 2, and re-evaporation of the working fluid in an evaporator 1 can be promoted. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a Rankine system that performs power generation, hot water supply, and the like by using, as a heat source, heat generated in nature such as sunlight, waste heat from internal combustion engines and boilers, factory waste heat, and the like.

Conventionally, this type of Rankine system includes an evaporator that heats and evaporates a working fluid by a predetermined heat source, a power generator such as a turbine that generates power by expansion of the working fluid evaporated by the evaporator, and power generation. It is equipped with a condenser that condenses the working fluid flowing out from the machine and a pump that sucks the working fluid flowing out from the condenser and discharges it to the evaporator side. The power generator drives the generator and distributes the condenser. There is known one that heats air for heating and generates hot water for hot water supply by the heat of the working fluid (see, for example, Patent Document 1).
JP 2004-60550 A

  However, in the Rankine system, since the working fluid flowing through the condenser always exchanges heat with air for heating or hot water for hot water supply, the temperature of the working fluid after condensation is useless when heating or hot water is not used. There is a problem that the thermal efficiency of the entire system is lowered.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a Rankine system that can efficiently use the heat of a working fluid for power generation, heating, and hot water generation. It is in.

  To achieve the above object, the present invention provides an evaporator that heats and evaporates a working fluid with a predetermined heat source, a power generator that generates power by expansion of the working fluid flowing out of the evaporator, and a power generator. A condenser that condenses the flowing working fluid and a pump that sucks the working fluid flowing out from the condenser and discharges it to the evaporator side, drives the generator by a power generator, and heats the working fluid by the heat of the working fluid In the Rankine system that heats the working air, a first heat exchanger that exchanges heat between the working fluid that flows out of the power generator and the working fluid that flows into the evaporator, and a power generator on one end side A bypass flow path connected between the condenser and the other end side connected to the outflow side of the condenser, and the working fluid flowing out from the power generator is circulated to either the condenser side or the bypass flow path side. Flow And switching valve, the working fluid flowing through the bypass passage and the air for heating and a second heat exchanger for exchanging heat.

  As a result, the working fluid that has flowed out of the power generator is circulated to the bypass flow path by the flow path switching valve, so that the working fluid that has flowed out of the power generator flows into the second heat exchanger, and the heating air is Since the heating air is heated by the working fluid of the second heat exchanger, the heating air can be heated without circulating the working fluid to the condenser. At this time, since the working fluid flowing into the evaporator side is heat-exchanged by the first heat exchanger with the working fluid flowing out from the power generator, the low-temperature working fluid flowing into the evaporator side is exchanged from the power generator. Heated by the hot working fluid that has flowed out.

  In order to achieve the above object, the present invention provides an evaporator that heats and evaporates a working fluid with a predetermined heat source, a power generator that generates power by expansion of the working fluid flowing out of the evaporator, A condenser for condensing the working fluid flowing out from the machine, and a pump for sucking the working fluid flowing out from the condenser and discharging it to the evaporator side. The power generator drives the generator, and heat of the working fluid In the Rankine system configured to generate hot water in the hot water storage tank, a first heat exchanger for exchanging heat between the working fluid flowing out from the power generator and the working fluid flowing into the evaporator generates power at one end side. A bypass flow path connected between the compressor and the condenser, with the other end connected to the outflow side of the condenser, and the working fluid flowing out from the power generator to either the condenser side or the bypass flow path side. Distributed A flow path switching valve that, the water flowing into the working fluid and the hot water storage tank flowing through the bypass passage and a second heat exchanger for exchanging heat.

  Thereby, the working fluid that has flowed out of the power generator is caused to flow through the bypass flow path by the flow path switching valve, so that the working fluid that has flowed out of the power generator flows into the second heat exchanger and flows into the hot water storage tank. Since water is heated by the working fluid of the second heat exchanger, when heating the hot water in the hot water tank, the water flowing into the hot water tank can be heated without circulating the working fluid to the condenser. It becomes possible. At this time, since the working fluid flowing into the evaporator side is heat-exchanged by the first heat exchanger with the working fluid flowing out from the power generator, the low-temperature working fluid flowing into the evaporator side is exchanged from the power generator. Heated by the hot working fluid that has flowed out.

  In order to achieve the above object, the present invention provides an evaporator that heats and evaporates a working fluid with a predetermined heat source, a power generator that generates power by expansion of the working fluid flowing out of the evaporator, A condenser for condensing the working fluid flowing out from the machine, and a pump for sucking the working fluid flowing out from the condenser and discharging it to the evaporator side. The power generator drives the generator, and heat of the working fluid In the Rankine system in which heating air is heated by the first heat exchanger for exchanging heat between the working fluid flowing out from the power generator and the working fluid flowing into the evaporator, power is generated at one end side. A first bypass flow path connected between the compressor and the condenser and having the other end connected to the outflow side of the condenser, and the working fluid flowing out from the power generator is connected to the condenser side and the first bypass flow Either on the roadside A first flow path switching valve that circulates in the direction, a second heat exchanger that exchanges heat between the working fluid that flows through the first bypass flow path and the air for heating, and an evaporator at one end side to generate power A second bypass flow path connected between the power generator and the other end side of the second heat exchanger connected to the inflow side of the second heat exchanger, and the working fluid flowing out of the evaporator from the power generator side and the second bypass And a second flow path switching valve that circulates in any one of the flow path sides.

  As a result, the working fluid that has flowed out of the power generator flows into the first bypass flow path by the first flow path switching valve, so that the working fluid that has flowed out of the power generator flows into the second heat exchanger. Since the heating air is heated by the working fluid of the second heat exchanger, when heating the heating air, the heating air is heated without circulating the working fluid to the condenser. It becomes possible. At this time, since the working fluid flowing into the evaporator side is heat-exchanged by the first heat exchanger with the working fluid flowing out from the power generator, the low-temperature working fluid flowing into the evaporator side is exchanged from the power generator. Heated by the hot working fluid that has flowed out. In addition, since the working fluid that has flowed out of the evaporator flows into the second bypass flow path by the second flow path switching valve, the working fluid that has flowed out of the evaporator flows into the second heat exchanger, Heating air is heated by the hot working fluid flowing out of the evaporator.

  According to the present invention, when heating air is heated by the heat of the working fluid, the heating air can be heated without circulating the working fluid to the condenser. Therefore, the heat of the working fluid is generated and heated. Each can be used efficiently for heating the air. At this time, since the low-temperature working fluid flowing into the evaporator can be heated by the high-temperature working fluid flowing out from the power generator, re-evaporation of the working fluid in the evaporator can be promoted.

  Further, according to the present invention, when the water flowing into the hot water tank is heated by the heat of the working fluid, the water flowing into the hot water tank can be heated without circulating the working fluid to the condenser. Can be efficiently used for power generation and heating of hot water in a hot water tank. At this time, since the low-temperature working fluid flowing into the evaporator can be heated by the high-temperature working fluid flowing out from the power generator, re-evaporation of the working fluid in the evaporator can be promoted.

  Further, according to the present invention, when heating air is heated without generating electricity, the heating air can be heated by a high temperature working fluid, so that a sufficient amount of heat can be obtained from the working fluid. .

  FIG. 1 shows a first embodiment of the present invention and is a schematic configuration diagram of a Rankine system.

  This Rankine system includes an evaporator 1 that evaporates working fluid, a power generator 2 that generates power by expansion of the working fluid that flows out of the evaporator 1, and a condenser that condenses the working fluid that flows out of the power generator 2. 3, a liquid receiver 4 that receives the working fluid flowing out from the condenser 3, a pump 5 that sucks the working fluid from the liquid receiver 4 side and discharges it to the evaporator 1 side, and flows out from the power generator 2. A first heat exchanger 6 that exchanges heat between the working fluid and the working fluid that flows into the evaporator 1, a bypass flow path 7 that branches from the outflow side circuit of the power generator 2, and an operation that flows through the bypass flow path 7. And a second heat exchanger 8 for exchanging heat between the fluid and the air for heating. The generator G is driven by the power generator 2 and the air for heating is heated by the heat of the working fluid. It has become.

  The evaporator 1 is configured to evaporate the working fluid flowing through the inside with a predetermined heat source (for example, natural energy such as sunlight, factory waste heat, etc.). As the heat source, for example, natural energy such as sunlight, factory Waste heat or the like is used. Further, for example, chlorofluorocarbon (R245fa or the like) is used as the working fluid.

  The power generator 2 is composed of a well-known device such as a turbine or a scroll type expander. The inflow side of the working fluid is connected to the outflow side of the evaporator 1, and the rotating shaft thereof is connected to the generator G.

  The condenser 3 is configured to condense the working fluid flowing through the inside by heat exchange with the outside air, and a blower 3a for blowing outside air is provided in the vicinity thereof.

  The liquid receiver 4 is configured to separate the working fluid flowing into the inside into a gas and a liquid, and the liquid working fluid flows out to the pump 5 side.

  The pump 5 is a well-known device that pumps the working fluid, and is provided between the inflow side of the evaporator 1 and the outflow side of the liquid receiver 4.

  The first heat exchanger 6 is provided in the outflow side circuit of the power generator 2 and the inflow side circuit of the evaporator 1, and the working fluid flowing out from the power generator 2 and the working fluid flowing into the evaporator 1 heat each other. It is configured to be exchanged.

  One end of the bypass flow path 7 is connected to the flow path between the outflow side of the power generator 2 (outflow side of the first heat exchanger 6) and the condenser 3, and the other end is connected to the condenser 3 and the liquid receiver. 4 is connected to the flow path between the two. A three-way valve 7a as a flow path switching valve is provided between the outflow side of the power generator 2 and the inflow side of the bypass flow path 7. By switching the flow path by the three-way valve 7a, the outflow from the power generator 2 The working fluid is circulated through either the condenser 3 side or the bypass flow path 7 side.

  The second heat exchanger 8 is provided in the bypass channel 7 and is configured to exchange heat between the working fluid flowing through the bypass channel 7 and the air for heating. In this case, the air heated by the second heat exchanger 8 is supplied to a predetermined heating space (not shown) by the blower 8a.

  When only power generation is performed in the Rankine system of this embodiment, the outflow side of the power generator 2 is communicated with the inflow side of the condenser 3 by the three-way valve 7a. Thereby, the working fluid heated and evaporated by the evaporator 1 flows into the power generator 2 and expands in the power generator 2. At that time, the power generator 2 rotates due to the expansion of the working fluid, and the power generator 2 drives the generator G. The working fluid that has flowed out of the power generator 2 flows into the condenser 3 to be condensed, and the working fluid that has flowed out of the condenser 3 is sucked into the pump 5 through the receiver 4 and is also evaporated by the pump 5. Discharged to the side. At that time, the working fluid flowing into the evaporator 1 side is exchanged with the working fluid flowing out from the power generator 2 by the first heat exchanger 6, and then flows into the evaporator 1 and evaporates again.

  Further, when power generation and heating are performed in the Rankine system, the outflow side of the power generator 2 is communicated with the bypass flow path 7 by the three-way valve 7a. As a result, the working fluid that has flowed out of the power generator 2 flows through the bypass flow path 7 and flows into the liquid receiver 4 without passing through the condenser 3. At that time, the working fluid flowing through the bypass flow path 7 exchanges heat with the heating air via the second heat exchanger 8, and the heating air is heated by the working fluid and supplied to a predetermined heating space. The

  Thus, according to the Rankine system of the present embodiment, the working fluid that has flowed out of the power generator 2 is switched to the flow path by the three-way valve 7 a and is circulated to the second heat exchanger 8 of the bypass flow path 7. Since the heating air is heated by the working fluid flowing through the second heat exchanger 8, the heating air is heated without flowing the working fluid through the condenser 3 when generating and heating. The heat of the working fluid can be used efficiently for power generation and heating, respectively. At that time, since the working fluid flowing out from the power generator 2 and the working fluid flowing into the evaporator 1 are heat-exchanged by the first heat exchanger 6, the high-temperature operation flowing out from the power generator 2 is performed. The low-temperature working fluid flowing into the evaporator 1 side can be heated by the fluid, and re-evaporation of the working fluid in the evaporator 1 can be promoted.

  Further, since the three-way valve 7a for switching the working fluid flow path to the bypass flow path 7 side is provided between the outflow side of the power generator 2 and the inflow side of the bypass flow path 7, the inflow side of the bypass flow path 7 is provided. It is possible to reliably communicate with the outflow side of the power generator 2.

  FIG. 2 shows a second embodiment of the present invention and is a schematic configuration diagram of a Rankine system. In addition, the same code | symbol is attached | subjected and shown to the component equivalent to 1st Embodiment.

  The Rankine system according to the present embodiment includes a three-way valve 7b provided between the outflow side of the condenser 3 and the outflow side of the bypass flow path 7 as a flow path switching valve instead of the three-way valve 7a of the first embodiment. I have. Thereby, since the temperature of the working fluid is lower on the outflow side of the condenser 3 and the bypass flow path 7 than on the outflow side of the power generator 2, it is not necessary to use an expensive one having high heat resistance as the three-way valve 7b. Cost can be reduced.

  FIG. 3 shows a third embodiment of the present invention and is a schematic configuration diagram of a Rankine system. In addition, the same code | symbol is attached | subjected and shown to the component equivalent to 1st Embodiment.

  The Rankine system according to the present embodiment includes a second heat exchanger 9 that exchanges heat between the working fluid flowing through the bypass flow path 7 and the water flowing into the hot water tank H, and the second heat exchange of the water in the hot water tank H. A water circuit 10 that circulates in the vessel 9 and a heater 11 that heats the water flowing from the second heat exchanger 9 into the hot water tank H are provided.

  The second heat exchanger 9 is provided in the bypass flow path 7 and the water circuit 10 and is configured to exchange heat between the working fluid flowing through the bypass flow path 7 and the water in the water circuit 10.

  The water circuit 10 is connected to the second heat exchanger 9 and the hot water tank H, and the water in the hot water tank H is circulated to the second heat exchanger 9 by the pump 10a. Further, tap water is supplied to the hot water tank H from the outside through the water supply pipe 12, and hot water in the hot water tank H is arbitrarily discharged from the hot water pipe 13.

  The heater 11 has an electric heater 11a as auxiliary heating means, and heats the water in the water circuit 10 that circulates inside the heater 11a.

  When only the power generation is performed in the Rankine system of the present embodiment, the power generator 2 is connected to the inflow side of the condenser 3 by connecting the outflow side of the power generator 2 to the inflow side of the condenser 3 by the three-way valve 7a. Is rotated by the expansion of the working fluid, and the generator G is driven by the power generator 2. At that time, the working fluid flowing out from the power generator 2 flows into the condenser 3 and is condensed by the condenser 3.

  Further, when power generation and hot water supply are performed in the Rankine system, the outflow side of the power generator 2 is communicated with the bypass flow path 7 by the three-way valve 7a. As a result, the working fluid that has flowed out of the power generator 2 flows through the bypass flow path 7 and flows into the liquid receiver 4 without passing through the condenser 3. At that time, the working fluid flowing through the bypass channel 7 is heat-exchanged with the water in the water circuit 10 through the second heat exchanger 9, and the water in the water circuit 10 is heated by the working fluid into the hot water storage tank H. Stored as hot water. Further, by operating the electric heater 11a of the heater 11, the water flowing into the hot water tank H is also heated by the electric heater 11a.

  As described above, according to the Rankine system of the present embodiment, the working fluid flowing out from the power generator 2 is switched to the flow path by the three-way valve 7a and is circulated to the first heat exchanger 9 in the bypass flow path 7. Since the water in the water circuit 10 is heated by the working fluid flowing through the first heat exchanger 9, the water in the water circuit 10 does not flow through the condenser 3 when power generation and hot water supply are performed. The heat of the working fluid can be efficiently used for power generation and hot water supply, respectively.

  Further, since the three-way valve 7a for switching the working fluid flow path to the bypass flow path 7 side is provided between the outflow side of the power generator 2 and the inflow side of the bypass flow path 7, the inflow side of the bypass flow path 7 is provided. It is possible to reliably communicate with the outflow side of the power generator 2.

  Furthermore, since the water flowing into the hot water tank H can be heated by the electric heater 11a of the heater 11, even when the amount of heat of the working fluid flowing through the bypass channel 7 is insufficient, the hot water in the hot water tank H is used as the electric heater. It can be heated to the required temperature by 11a.

  FIG. 4 shows a fourth embodiment of the present invention and is a schematic configuration diagram of a Rankine system. In addition, the same code | symbol is attached | subjected and shown to the component equivalent to 3rd Embodiment.

  The Rankine system according to the present embodiment includes a three-way valve 7b provided between the outflow side of the condenser 3 and the outflow side of the bypass flow path 7 as a flow path switching valve in place of the three-way valve 7a of the third embodiment. I have. Thereby, since the temperature of the working fluid is lower on the outflow side of the condenser 3 and the bypass flow path 7 than on the outflow side of the power generator 2, it is not necessary to use an expensive one having high heat resistance as the three-way valve 7b. Cost can be reduced.

  FIG. 5 shows a fifth embodiment of the present invention and is a schematic configuration diagram of a Rankine system. In addition, the same code | symbol is attached | subjected and shown to the component equivalent to 1st Embodiment.

  The Rankine system according to the present embodiment includes a first bypass passage 14 that branches from the outflow side circuit of the power generator 2 and a second bypass passage 15 that branches from the outflow side circuit of the evaporator 1. One bypass flow path 14 is provided with the second heat exchanger 8.

  As in the first embodiment, one end of the first bypass channel 14 is connected to the channel between the outflow side of the power generator 2 and the condenser 3, and the other end is connected to the condenser 3 and the receiver 4. Is connected to the flow path between. A first three-way valve 14a serving as a first flow path switching valve is provided between the outflow side of the power generator 2 and the inflow side of the first bypass flow path 14, and is flown by the first three-way valve 14a. By switching the path, the working fluid flowing out from the power generator 2 is circulated to either the condenser 3 side or the first bypass flow path 14 side.

  The second bypass flow path 15 has one end connected to the flow path between the evaporator 1 and the power generator 2, and the other end connected to the inflow side of the second heat exchanger 8 in the first bypass flow path 14. It is connected. A second three-way valve 15a as a second flow path switching valve is provided between the outflow side of the evaporator 1 and the inflow side of the power generator 2, and the flow path is switched by the second three-way valve 15a. Thus, the working fluid flowing out of the evaporator 1 is circulated to either the power generator 2 side or the second bypass flow path 15 side. An expansion valve 15 b is provided on the inflow side of the second heat exchanger 8 in the second bypass flow path 15.

  When only the power generation is performed in the Rankine system of the present embodiment, the first three-way valve 14a communicates the outflow side of the power generator 2 to the inflow side of the condenser 3, so that the power is the same as in the first embodiment. The generator 2 is rotated by the expansion of the working fluid, and the generator G is driven by the power generator 2. At that time, the working fluid flowing out from the power generator 2 flows into the condenser 3 and is condensed by the condenser 3.

  When power generation and heating are performed in the Rankine system, the outflow side of the power generator 2 is communicated with the first bypass passage 14 by the first three-way valve 14a. As a result, the working fluid that has flowed out of the power generator 2 flows through the first bypass flow path 14 and flows into the liquid receiver 4 without passing through the condenser 3. At that time, the working fluid flowing through the first bypass passage 14 is heat-exchanged with the heating air via the second heat exchanger 8, and the heating air is heated by the working fluid.

  Furthermore, when only heating is performed in the Rankine system, the outflow side of the evaporator 1 is communicated with the second bypass passage 15 by the second three-way valve 15a. As a result, the working fluid flowing out of the evaporator 1 flows through the second bypass passage 15 and flows into the second heat exchanger 8 without passing through the power generator 2 and the condenser 3. At that time, the heating air is heated by the working fluid flowing through the second heat exchanger 8.

  Thus, according to the Rankine system of the present embodiment, the working fluid flowing out of the evaporator 1 is circulated to the second bypass passage 15 by switching the passage by the second three-way valve 15a. The air for heating is heated by the working fluid flowing through the second heat exchanger 8 by flowing it from the flow path 15 to the second heat exchanger 8. Heating air can be heated without flowing through the power generator 2 and the condenser 3, and the heat of the working fluid can be efficiently used for power generation and heating, respectively. At that time, since the heating air can be heated by the high-temperature working fluid that flows out of the evaporator 1, a sufficient amount of heat can be obtained from the working fluid when the heating air is heated.

The schematic block diagram of Rankine system which shows the 1st Embodiment of this invention The schematic block diagram of Rankine system which shows the 2nd Embodiment of this invention The schematic block diagram of Rankine system which shows the 3rd Embodiment of this invention The schematic block diagram of Rankine system which shows the 4th Embodiment of this invention The schematic block diagram of Rankine system which shows the 5th Embodiment of this invention

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Evaporator, 2 ... Power generator, 3 ... Condenser, 5 ... Pump, 6 ... 1st heat exchanger, 7 ... Bypass circuit, 7a, 7b ... Three-way valve, 8 ... 2nd heat exchanger, DESCRIPTION OF SYMBOLS 11a ... Electric heater, 14 ... 1st bypass circuit, 14a, 14c ... 1st three-way valve, 15 ... 2nd bypass circuit, 15a ... 2nd three-way valve, G ... Generator, H ... Hot water storage tank.

Claims (6)

An evaporator that heats and evaporates the working fluid with a predetermined heat source, a power generator that generates power by expansion of the working fluid that flows out of the evaporator, a condenser that condenses the working fluid that flows out of the power generator, A Rankine system that includes a pump that sucks the working fluid flowing out of the condenser and discharges it to the evaporator side, drives the generator by a power generator, and heats the air for heating by the heat of the working fluid In
A first heat exchanger for exchanging heat between the working fluid flowing out of the power generator and the working fluid flowing into the evaporator;
A bypass flow path having one end connected between the power generator and the condenser and the other end connected to the outflow side of the condenser;
A flow path switching valve for flowing the working fluid flowing out from the power generator to either the condenser side or the bypass flow path side;
A Rankine system comprising a second heat exchanger for exchanging heat between the working fluid flowing through the bypass flow path and the air for heating. An evaporator that heats and evaporates the working fluid with a predetermined heat source, a power generator that generates power by expansion of the working fluid that flows out of the evaporator, a condenser that condenses the working fluid that flows out of the power generator, A Rankine system comprising a pump that sucks the working fluid flowing out from the condenser and discharges it to the evaporator side, drives the generator by a power generator, and generates hot water in the hot water tank by the heat of the working fluid In
A first heat exchanger for exchanging heat between the working fluid flowing out of the power generator and the working fluid flowing into the evaporator;
A bypass flow path having one end connected between the power generator and the condenser and the other end connected to the outflow side of the condenser;
A flow path switching valve for flowing the working fluid flowing out from the power generator to either the condenser side or the bypass flow path side;
A Rankine system comprising: a second heat exchanger for exchanging heat between the working fluid flowing through the bypass passage and the water flowing into the hot water storage tank. The Rankine system according to claim 2, further comprising auxiliary heating means for heating water flowing into the hot water storage tank from the heat exchanger. The Rankine system according to claim 1, 2 or 3, wherein the flow path switching valve is provided between the outflow side of the power generator and the inflow side of the bypass flow path. The Rankine system according to claim 1, 2 or 3, wherein the flow path switching valve is provided between the outflow side of the condenser and the outflow side of the bypass flow path. An evaporator that heats and evaporates the working fluid with a predetermined heat source, a power generator that generates power by expansion of the working fluid that flows out of the evaporator, a condenser that condenses the working fluid that flows out of the power generator, A Rankine system that includes a pump that sucks the working fluid flowing out of the condenser and discharges it to the evaporator side, drives the generator by a power generator, and heats the air for heating by the heat of the working fluid In
A first heat exchanger for exchanging heat between the working fluid flowing out of the power generator and the working fluid flowing into the evaporator;
A first bypass flow path having one end connected between the power generator and the condenser and the other end connected to the outflow side of the condenser;
A first flow path switching valve for flowing the working fluid flowing out of the power generator to either the condenser side or the first bypass flow path side;
A second heat exchanger for exchanging heat between the working fluid flowing through the first bypass flow path and the air for heating;
A second bypass flow path having one end connected between the evaporator and the power generator and the other end connected to the inflow side of the second heat exchanger;
A Rankine system comprising: a second flow path switching valve for flowing the working fluid flowing out of the evaporator to either the power generator side or the second bypass flow path side.

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