JP2014190613A - Heat pump system and heat pump system operation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pump system that can be used for either use, a heat pump using heat from a plurality of heat sources or a heat pump that can supply heat in a plurality of temperature ranges, and an operation method for the heat pump system.SOLUTION: A heat pump system 1 comprises: an evaporator 2; a condenser 3; a first channel 4A; a second channel 4B; a bypass channel 5; a heat exchanger 6 provided in the bypass channel 5, and causing heat exchange between refrigerant R and outside; compressors A1 and A2 provided between a first connection portion S1 and the evaporator 2 and between the first connection portion S1 and the condenser 3, respectively, and pumping the refrigerant R from the evaporator 2 toward the condenser 3; and expansion valves B1 and B2 provided between a second connection portion S2 and the evaporator 2 and between the second connection portion S2 and the condenser 3, respectively, and expanding the refrigerant R from the condenser 3 toward the evaporator 2.

Description

  The present invention relates to a heat pump system and a method for operating the heat pump system.

  Generally, a heat pump system is employed to supply warm heat (see Patent Document 1 below). For example, in a heat pump system, there is a configuration in which a working fluid heated by a first heat source is further heated by a second heat source to exchange heat with a refrigerant in the heat pump.

  There is also known a heat pump system capable of supplying heat in a plurality of different temperature ranges by supplying heat from a single heat source discharged from a refrigerator or the like to a plurality of heat pumps in different temperature ranges.

JP 2010-197007 A

  However, in the configuration in which the working fluid is heated by the first heat source and the second heat source, the working fluid finally supplied to the heat pump is an intermediate temperature body between the first heat source and the second heat source. Therefore, there is a problem that efficient heat exchange cannot be performed.

  Moreover, in the heat pump system for supplying heat in the plurality of temperature ranges described above, there is a problem that the entire system becomes large and the apparatus configuration becomes complicated because the apparatus configuration is such that a plurality of heat pumps are combined.

  The present invention has been made in order to solve the above-mentioned problems. As a use of either a heat pump that uses heat from a plurality of heat sources or a heat pump that can supply heat in a plurality of temperature ranges with a simple apparatus configuration. Provided is a heat pump system that can also be used and a method of operating the heat pump system.

In order to achieve the above object, the present invention employs the following means.
That is, the heat pump system according to the present invention includes an evaporator that evaporates the refrigerant by exchanging heat with the outside, a condenser that condenses the refrigerant by exchanging heat with the outside, and the refrigerant evaporated by the evaporator. A first flow path leading to the condenser, a second flow path leading the refrigerant condensed in the condenser to the evaporator, a bypass flow path connecting the first flow path and the second flow path, A heat exchanger that is provided in the bypass flow path and exchanges heat between the refrigerant and the outside; a first connection portion that is a connection portion between the first flow path and the bypass flow path; and the evaporator; A compressor that is provided between the connection portion and the condenser and that pumps the refrigerant from the evaporator toward the condenser; and a connection portion between the second flow path and the bypass flow path. Between the two connections and the evaporator and the second connection Respectively provided between the condenser, characterized in that it comprises an expansion valve for expanding the refrigerant toward the evaporator from the condenser.

  In the heat pump system configured as described above, the heat exchanger causes the refrigerant derived from the evaporator to exchange heat with the outside to condense the refrigerant, and causes the refrigerant derived from the condenser to exchange heat with the outside. The evaporator mode for evaporating the refrigerant can be switched. Therefore, heat exchange can be performed using heat from a plurality of heat sources by the evaporator and the heat exchanger operated in the evaporator mode. Moreover, the heat of several temperature range can be supplied with the heat exchanger operated as a condenser and a condenser mode.

In the heat pump system according to the present invention, a plurality of the bypass flow paths are provided,
The heat exchanger is provided in each of the plurality of bypass passages, the compressor is further provided between adjacent bypass passages in the first passage, and the expansion valve is provided in the second passage. It is preferable that it is further provided between the said bypass flow paths which adjoin.

  In the heat pump system configured as described above, since a plurality of heat exchangers are provided, heat is generated by using heat from a larger number of heat sources by a plurality of heat exchangers operated as an evaporator and an evaporator mode. Can be exchanged. Further, heat in a larger temperature range can be supplied by the condenser and the heat exchanger operated as the condenser mode.

  Further, according to the operation method of the heat pump system of the present invention, the heat exchanger causes the refrigerant derived from the evaporator to exchange heat with the outside according to the output of the compressor or the opening of the expansion valve. It is operated as either one of a condenser mode for condensing the refrigerant and an evaporator mode for evaporating the refrigerant by exchanging heat with the refrigerant derived from the condenser.

  In the operation method of the heat pump system configured as described above, the output of the compressor or the opening of the expansion valve is adjusted according to the demand, and the heat exchanger is operated as one of the condenser mode and the evaporator mode. Can be made.

  According to the heat pump system and the operation method of the heat pump system according to the present invention, the heat pump system can be used as either a heat pump using heat from a plurality of heat sources or a heat pump capable of supplying heat in a plurality of temperature ranges with a simple apparatus configuration. I can do things.

In the heat pump system which concerns on 1st embodiment of this invention, it is a systematic diagram which shows the structure which a heat exchanger operates as a condenser mode. In the heat pump system which concerns on 1st embodiment of this invention, it is a systematic diagram which shows the structure which a heat exchanger operates as an evaporator mode. In the heat pump system which concerns on 2nd embodiment of this invention, it is a systematic diagram which shows the structure which two heat exchangers operate | move as a condenser mode. In the heat pump system which concerns on 2nd embodiment of this invention, it is a systematic diagram which shows the structure from which one operate | moves as a condenser mode among two heat exchangers, and operates as an evaporator mode. In the heat pump system which concerns on 2nd embodiment of this invention, it is a systematic diagram which shows the structure which both two heat exchangers operate | move as evaporator mode.

(First embodiment)
Hereinafter, a heat pump system according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, the heat pump system 1 includes an evaporator 2, a condenser 3, a first flow path 4 </ b> A and a second flow path 4 </ b> B that connect the evaporator 2 and the condenser 3 to circulate the refrigerant R. And a bypass channel 5 that connects the first channel 4A and the second channel 4B, and a heat exchanger 6 provided in the bypass channel 5.

  The evaporator 2 exchanges heat between the first heating medium N1 and the refrigerant R supplied from the outside to evaporate the refrigerant R, raise the temperature of the refrigerant R, and lower the temperature of the first heating medium N1. To supply the cold load F1. The evaporator 2 is connected to the first flow path 4A.

The first flow path 4 </ b> A guides the refrigerant R evaporated by the evaporator 2 to the condenser 3.
A first compressor A1 (compressor) is provided on the downstream side of the evaporator 2 in the first flow path 4A. The first compressor A1 is provided with an inverter I1 (control unit) that controls the rotational speed of the compressor.

  A second compressor A2 (compressor) is provided on the downstream side of the first compressor A1 in the first flow path 4A. The second compressor A2 is provided with an inverter I2 that controls the rotational speed of the compressor.

  The first compressor A1 pumps the refrigerant R derived from the evaporator 2 and compresses it to a predetermined pressure value. The second compressor A2 pumps the refrigerant R derived from the first compressor A1 and compresses it to a predetermined pressure value.

  A condenser 3 is provided on the downstream side of the second compressor A2 in the first flow path 4A. The condenser 3 exchanges heat between the second heat medium N2 supplied from the outside and the refrigerant R derived from the second compressor A2, condenses the refrigerant R, lowers the temperature of the refrigerant R, and The temperature of the heat medium N2 is raised and supplied to the heat load F2. The condenser 3 is connected to the second flow path 4B.

The second flow path 4 </ b> B guides the refrigerant R condensed by the condenser 3 to the evaporator 2.
A first expansion valve B1 (expansion valve) is provided on the downstream side of the condenser 3 in the second flow path 4B. Furthermore, a second expansion valve B2 (expansion valve) is provided downstream of the first expansion valve B1 in the second flow path 4B.

  The first expansion valve B1 expands the refrigerant R derived from the condenser 3 to a predetermined pressure value. The second expansion valve B2 expands the refrigerant R derived from the first expansion valve B1 to a predetermined pressure value.

  The evaporator 2 is provided on the downstream side of the second expansion valve B2 in the second flow path 4B. In this way, the first flow path 4A and the second flow path 4B connect the evaporator 2 and the condenser 3 in a ring shape.

  The bypass flow path 5 connects the first connection part S1 on the downstream side of the evaporator 2 in the first flow path 4A and the second connection part S2 on the downstream side of the condenser 3 to circulate the refrigerant R. The first connection portion S1 and the second connection portion S2 are each provided with a pressure gauge (not shown).

  In the present embodiment, the first connection portion S1 is located on the downstream side of the first compressor A1 and the upstream side of the second compressor A2 in the first flow path 4A. The second connection portion S2 is located on the downstream side of the first expansion valve B1 and the upstream side of the second expansion valve B2 in the second flow path 4B.

  In other words, the first compressor A1 is provided between the first connection part S1 and the evaporator 2, and the second compressor A2 is provided between the first connection part S1 and the condenser 3. Further, a first expansion valve B1 is provided between the second connection part S2 and the condenser 3, and a second expansion valve B2 is provided between the second connection part S2 and the evaporator 2.

  The heat exchanger 6 is provided in the bypass channel 5. The heat exchanger 6 exchanges heat between the third heat medium N3 and the refrigerant R supplied from the outside, and increases the temperature of the third heat medium N3 in the condenser mode or the temperature of the third heat medium N3. Operates as one of the evaporator modes to cool down.

Next, an operation method of the heat pump system configured as described above will be described.
The flow rate of the refrigerant R that circulates is adjusted according to the outputs of the first compressor A1 and the second compressor A2, the opening of the first expansion valve B1 and the second expansion valve B2, and the heat exchanger 6 is set in the condenser mode. Or it operates as an evaporator mode.

  For example, the outputs of the first compressor A1 and the second compressor A2 are set so that the flow rate of the refrigerant R derived from the first compressor A1 is larger than the flow rate of the refrigerant R introduced into the second compressor A2. adjust. In this case, the refrigerant R flows through the bypass channel 5 from the first connection part S1 toward the second connection part S2, and the heat exchanger 6 operates in the condenser mode.

  On the other hand, the outputs of the first compressor A1 and the second compressor A2 are set so that the flow rate of the refrigerant R derived from the first compressor A1 is smaller than the flow rate of the refrigerant R introduced into the second compressor A2. adjust. In this case, the refrigerant R flows through the bypass channel 5 from the second connection part S2 toward the first connection part S1, and the heat exchanger 6 operates in the evaporator mode.

  Moreover, the opening degree of the first expansion valve B1 and the second expansion valve B2 so that the flow rate of the refrigerant R derived from the first expansion valve B1 is smaller than the flow rate of the refrigerant R introduced into the second expansion valve B2. Adjust. In this case, the refrigerant R flows through the bypass channel 5 from the first connection part S1 toward the second connection part S2, and the heat exchanger 6 operates in the condenser mode.

  On the other hand, the opening degree of the first expansion valve B1 and the second expansion valve B2 so that the flow rate of the refrigerant R derived from the first expansion valve B1 is larger than the flow rate of the refrigerant R introduced into the second expansion valve B2. Adjust. In this case, the refrigerant R flows through the bypass channel 5 from the second connection part S2 toward the first connection part S1, and the heat exchanger 6 operates in the evaporator mode.

  As described above, when the heat exchanger 6 is operated in the condenser mode, the refrigerant R derived from the evaporator 2, that is, the refrigerant R derived from the first compressor A <b> 1 enters the bypass flow path 5 in the first connection portion S <b> 1. Circulates toward the second connection part S2. On the other hand, when the heat exchanger 6 is operated in the evaporator mode, the refrigerant R led out from the condenser 3, that is, the refrigerant R led out from the first expansion valve B1 is supplied to the bypass channel 5 from the second connection portion S2. The refrigerant R flows toward the one connection part S1.

Next, the operation of the heat pump system 1 configured as described above will be described.
The first heat medium N1 is heat-exchanged with the refrigerant R circulating in the first flow path 4A and the second flow path 4B in the evaporator 2. Thereby, the refrigerant R recovers heat from the first heat medium N1.

  On the other hand, the refrigerant R that has been heated and exchanged with the first heat medium N1 in the evaporator 2 is led out from the evaporator 2, flows through the first flow path 4A, and is introduced into the first compressor A1. The refrigerant R is compressed to a predetermined pressure value in the first compressor A1.

  The refrigerant R compressed by the first compressor A1 is led out from the first compressor A1, flows through the first flow path 4A, and is introduced into the second compressor A2. The refrigerant R is further compressed to a predetermined pressure value in the second compressor A2.

  The refrigerant R compressed by the second compressor A2 is led out from the second compressor A2, flows through the first flow path 4A, and is introduced into the condenser 3.

  The refrigerant R is heat-exchanged with the second heat medium N2 in the condenser 3. Thereby, the second heating medium N2 is heated and supplied to the thermal load F2.

  On the other hand, the refrigerant R that has been cooled by the condenser 3 and exchanged heat with the second heat medium N2 is led out from the condenser 3, flows through the second flow path 4B, and is introduced into the first expansion valve B1. The refrigerant R is expanded to a predetermined pressure value at the first expansion valve B1.

  The refrigerant R expanded by the first expansion valve B1 is led out from the first expansion valve B1, flows through the second flow path 4B, and is introduced into the second expansion valve B2. The refrigerant R is further expanded to a predetermined pressure value at the second expansion valve B2.

  The refrigerant R expanded by the second expansion valve B2 is led out from the second expansion valve B2, flows through the second flow path 4B, and is returned to the evaporator 2 again.

  Here, for example, the first compressor A1 and the second compressor A2 are configured such that the flow rate of the refrigerant R derived from the first compressor A1 is larger than the flow rate of the refrigerant R introduced into the second compressor A2. When the output is adjusted, the refrigerant R derived from the first compressor A1 is introduced into the second compressor A2 and introduced into the bypass flow path 5 from the first connection portion S1.

  The refrigerant R introduced into the bypass channel 5 is heat-exchanged with the third heat medium N3 in the heat exchanger 6 operated in the condenser mode. The heat exchanged third heating medium N3 is heated and supplied to the external load F3.

  That is, since the heat exchanger 6 operating as the condenser 3 and the condenser mode can be supplied to the thermal load F2 and the external load F3, respectively, heat in a plurality of temperature ranges can be supplied to the outside.

  On the other hand, the refrigerant R that has been heat-exchanged with the third heat medium N <b> 3 in the heat exchanger 6 and lowered in temperature is led out from the heat exchanger 6 and flows through the bypass flow path 5. The refrigerant R merges with the refrigerant R derived from the first expansion valve B1 at the second connection portion S2, and is introduced into the second expansion valve B2. The operation of the refrigerant R introduced into the second expansion valve B2 is as described above.

  Further, the outputs of the first compressor A1 and the second compressor A2 are set so that the flow rate of the refrigerant R derived from the first compressor A1 is smaller than the flow rate of the refrigerant R introduced into the second compressor A2. When adjusted, the refrigerant R derived from the first expansion valve B1 is introduced into the second expansion valve B2 and introduced into the bypass flow path 5 from the second connection portion S2.

  The refrigerant R introduced into the bypass channel 5 is heat-exchanged with the third heat medium N3 in the heat exchanger 6 operated in the evaporator mode, and heat is recovered from the third heat medium N3.

  That is, since the heat recovery from the first heat medium N1 and the third heat medium N3 can be performed by the evaporator 2 and the heat exchanger 6 operating in the evaporator mode, respectively, heat recovery is performed from a plurality of external heat media. Can do.

  On the other hand, the refrigerant R heated by the heat exchanger 6 to exchange heat with the third heat medium N3 is led out from the heat exchanger 6 and flows through the bypass flow path 5. The refrigerant R merges with the refrigerant R derived from the first compressor A1 at the first connection portion S1, and is introduced into the second compressor A2. The operation of the refrigerant R introduced into the second compressor A2 is as described above.

In the heat pump system 1 configured as described above, the heat exchanger 6 is configured to be switchable between a condenser mode and an evaporator mode.
Therefore, since the heat exchanger 6 operated as the evaporator 2 and the evaporator mode can recover the heat from the first heat medium N1 and the third heat medium N3, the heat exchanger 6 can recover the heat from a plurality of external exhaust heat media. Can do.
When the evaporator mode is switched to the condenser mode, the heat exchanger 6 operated as the condenser 3 and the condenser mode can supply heat to the thermal load F2 and the external load F3. The heat can be supplied to the outside.
Therefore, it can be used as either a heat pump using heat from a plurality of heat sources and a heat pump capable of supplying heat in a plurality of temperature ranges by switching modes according to demand and efficiently exchanging heat.

  Further, instead of providing a condenser that supplies heat to the external load F3 and an evaporator that recovers heat from the third heat medium N3, a single heat exchanger 6 that serves as a condenser and an evaporator is provided. Therefore, a simple device configuration can be obtained.

  Furthermore, the heat exchanger 6 is switched to the condenser mode or the evaporator mode by adjusting the outputs of the first compressor A1 and the second compressor A2 and the opening degrees of the first expansion valve B1 and the second expansion valve B2. Therefore, a simple apparatus configuration can be obtained.

  Moreover, since the one heat exchanger 6 can be operated as the evaporator 2 and can also be operated as the condenser 3, the entire apparatus can be made smaller than the case where the evaporator 2 and the condenser 3 are separately provided. it can.

  Moreover, the refrigerant | coolant R which distribute | circulates the 1st flow path 4A, the 2nd flow path 4B, and the bypass flow path 5 is the same, The whole system becomes a single closed loop through which the refrigerant | coolant R distribute | circulates. Therefore, it is more efficient than a case where different working fluids are circulated through the first flow path 4A, the second flow path 4B, and the bypass flow path 5 to indirectly heat-exchange the heat at a plurality of locations between the plurality of loops. The refrigerant R can be heat exchanged.

(Second embodiment)
Hereinafter, the heat pump system according to the second embodiment of the present invention will be described mainly with reference to FIGS.
In this embodiment, members that are the same as those used in the above-described embodiment are assigned the same reference numerals, and descriptions thereof are omitted.

  As shown in FIGS. 3 to 5, in the heat pump system 201 in the present embodiment, bypass flow paths 205A and 205B are provided, and heat exchangers 206A and 206B are provided in the plurality of bypass flow paths 205A and 205B, respectively. Yes.

  A first compressor A201, a second compressor A202, and a third compressor A203 are provided in this order as compressors on the downstream side of the evaporator 2 in the first flow path 204A. The compressors A201, A202, and A203 are provided with inverters I201, I202, and I203, respectively.

  A first expansion valve B201, a second expansion valve B202, and a third expansion valve B203 are provided in this order as expansion valves on the downstream side of the condenser 3 in the second flow path 204B.

  The bypass flow path 205A connects the first connection portion S201 in the first flow path 204A and the second connection portion S202 in the second flow path 204B. The first connecting portion S201 is located on the downstream side of the first compressor A201 and the upstream side of the second compressor A202 in the first flow path 204A. Further, the second connection portion S202 is located on the downstream side of the second expansion valve B202 and the upstream side of the third expansion valve B203 in the second flow path 204B.

  Further, the bypass flow path 205B connects the third connection portion S203 in the first flow path 204A and the fourth connection portion S204 in the second flow path 204B. The third connection portion S203 is located on the downstream side of the second compressor A202 and the upstream side of the third compressor A203 in the first flow path 204A. The fourth connection portion S204 is located downstream of the first expansion valve B201 and upstream of the second expansion valve B202 in the second flow path 204B.

  In other words, the second compressor A202 is provided between the adjacent bypass flow paths 205A and 205B in the first flow path 204A, that is, between the first connection part S201 and the third connection part S203. The second expansion B202 is provided between the adjacent bypass flow paths 205A and 205B in the second flow path 204B, that is, between the second connection portion S202 and the fourth connection portion S204.

  Further, heat exchangers 206A and 206B are provided in the bypass flow paths 205A and 205B, respectively.

  The heat exchanger 206A exchanges heat between the third heat medium N203 and the refrigerant R supplied from the outside. The heat exchanged third heat medium N is supplied to the external load 203. The heat exchanger 206B exchanges heat between the fourth heat medium N204 and the refrigerant R supplied from the outside. The heat exchanged fourth heat medium N is supplied to the external load 204. These heat exchangers 206A and 206B operate in a condenser mode or an evaporator mode, respectively.

  FIG. 3 shows a state in which the heat exchangers 206A and 206B are operated in the condenser mode in the heat pump system 201 configured as described above. In this case, in the bypass channel 205A, the refrigerant R flows from the first connection portion S201 toward the second connection portion S202. In the bypass flow path 205B, the refrigerant R flows from the third connection part S203 toward the fourth connection part S204.

  FIG. 4 shows a state in which the heat exchanger 206A operates in the evaporator mode and the heat exchanger 206B operates in the condenser mode. In this case, in the bypass channel 205A, the refrigerant R flows from the second connection portion S202 toward the first connection portion S201. In the bypass flow path 205B, the refrigerant R flows from the third connection part S203 toward the fourth connection part S204.

  FIG. 5 shows a state where the heat exchangers 206A and 206B are each operated in the evaporator mode. In this case, in the bypass channel 205A, the refrigerant R flows from the second connection portion S202 toward the first connection portion S201. In the bypass channel 205B, the refrigerant R flows from the fourth connection portion S204 toward the third connection portion S203.

  In the heat pump system 201 configured as described above, the heat exchangers 206A and 206B are operated in the condenser mode, so that the condenser 3 and the heat exchangers 206A and 206B are heated to the thermal load F2 and the external loads F203 and 204, respectively. Therefore, heat in a plurality of temperature ranges can be supplied to the outside.

  Further, by operating the heat exchanger 206A in the evaporator mode and operating the heat exchanger 206B in the condenser mode, the evaporator 2 and the heat exchanger 206A are separated from the first heat medium N1 and the third heat medium N203. Therefore, it is possible to recover heat from a plurality of external exhaust heat media. Furthermore, since the condenser 3 and the heat exchanger 206B can supply heat to the thermal load F2 and the external load F204, heat in a plurality of temperature ranges can be supplied to the outside.

  Further, by operating the heat exchangers 206A and 206B in the evaporator mode, the evaporator 2 and the heat exchangers 206A and 206B are heated from the first heat medium N1, the third heat medium N203, and the fourth heat medium N204. Since it can be recovered, heat can be recovered from a plurality of external exhaust heat media.

  In this way, the heat exchangers 206A and 206B can be selected to specialize in heat recovery from a plurality of exhaust heat media or to specialize supply of heat in a plurality of temperature ranges to the outside. It is also possible to make both compatible. Therefore, the heat exchangers 206A and 206B can be switched to the condenser mode or the evaporator mode according to the demand, and the optimum heat exchange can be selected.

  The various shapes and combinations of the constituent members shown in the above-described embodiments are merely examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, in the above-described embodiment, the case where the heat exchangers 6, 206A, and 206B are configured by one or two has been described as an example, but the present invention is not limited to this. Therefore, the heat exchanger may be composed of three or more. In this case, more heat in the temperature range can be supplied to the outside. Furthermore, it is possible to recover heat from many types of exhaust heat medium.

DESCRIPTION OF SYMBOLS 1 ... Heat pump system 2 ... Evaporator 3 ... Condenser 4A ... 1st flow path 4B ... 2nd flow path 5 ... Bypass flow path 6 ... Heat exchanger A1 ... 1st compressor (compressor)
A2 ... Second compressor (compressor)
B1 ... First expansion valve (expansion valve)
B2 ... Second expansion valve (expansion valve)
S1 ... 1st connection part S2 ... 2nd connection part

Claims (3)

An evaporator that evaporates the refrigerant by exchanging heat with the outside;
A condenser for condensing the refrigerant by exchanging heat with the outside;
A first flow path for guiding the refrigerant evaporated in the evaporator to the condenser;
A second flow path for guiding the refrigerant condensed in the condenser to the evaporator;
A bypass flow path connecting the first flow path and the second flow path;
A heat exchanger provided in the bypass flow path for exchanging heat between the refrigerant and the outside;
Provided between the first connecting part and the evaporator, which are connecting parts of the first flow path and the bypass flow path, and between the first connecting part and the condenser, respectively, and from the evaporator to the condensation A compressor for pumping the refrigerant toward the container;
Provided between the second connecting part and the evaporator, which are connecting parts of the second flow path and the bypass flow path, and between the second connecting part and the condenser, respectively, from the condenser A heat pump system comprising: an expansion valve that expands the refrigerant toward the evaporator. The heat pump system according to claim 1,
A plurality of the bypass channels are provided,
The heat exchanger is provided in each of the plurality of bypass channels,
The compressor is further provided between the adjacent bypass channels in the first channel,
The heat pump system, wherein the expansion valve is further provided between adjacent bypass flow paths in the second flow path. An operation method of the heat pump system according to claim 1 or 2,
Depending on the output of the compressor or the opening of the expansion valve,
The heat exchanger causes the refrigerant derived from the evaporator to exchange heat with the outside to condense the refrigerant, and the refrigerant derived from the condenser exchanges heat with the outside to evaporate the refrigerant. The operation method of the heat pump system characterized by operating as either one of the evaporator modes to be performed.

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