Heat pump host system

Abstract

The utility model discloses a heat pump host system which comprises a refrigerant system and a water system, and a circulating secondary refrigerant in the refrigerant system exchanges heat with a circulating liquid medium in the water system in a second heat exchanger; the refrigerant system comprises a compressor, a reversing valve, a first heat exchanger and a first expansion valve, and the compressor, the reversing valve, the first heat exchanger and the first expansion valve are sequentially connected through pipelines. The refrigerant system is further provided with a second expansion valve and an economizer. The first expansion valve is connected with a first pipeline and a second pipeline, the first pipeline passes through the second expansion valve and the second path of the economizer and is connected to the compressor, and the second pipeline passes through the first path of the economizer and the second heat exchanger and is connected to the reversing valve. According to the application, the refrigeration mode, the first heating mode and the second heating mode can be selected and switched so as to adapt to the use requirements in different use scenes.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of heat pump, and particularly relates to a heat pump host system. BACKGROUND

[0002] The heat pump host system usually realizes refrigeration or heating function through heat exchange between a refrigerant system and a water system. The common heat pump host on the market has low integration, which makes the heat pump host only switch between refrigeration mode and single heating mode, and cannot flexibly adjust the operation mode according to different use scenarios. For example, when running in a low temperature environment, the enthalpy value of the cold carrier of the refrigerant system of the heat pump host system is low, and the heating capacity of the compressor is limited, resulting in poor heating effect, which is difficult to meet the use demand under severe cold conditions. CONTENT OF THE UTILITY MODEL

[0003] The application aims to improve the technical problem in the prior art that the heat pump host has low integration, and can only switch between refrigeration mode and single heating mode, and cannot flexibly adjust the operation mode according to different use scenarios.

[0004] A heat pump host system, comprising: a refrigerant system and a water system, a circulating cold carrier in the refrigerant system and a circulating liquid medium in the water system performing heat exchange in a second heat exchanger;

[0005] The refrigerant system comprises a compressor, a reversing valve, a first heat exchanger and a first expansion valve, and the compressor, the reversing valve, the first heat exchanger and the first expansion valve are sequentially connected by pipelines;

[0006] The refrigerant system is further provided with a second expansion valve and an economizer; the first expansion valve is respectively connected with a first pipeline and a second pipeline, the first pipeline passes through the second expansion valve, a second path of the economizer and is connected to the compressor, and the second pipeline passes through a first path of the economizer, a first path of the second heat exchanger, the reversing valve and is connected to the compressor.

[0007] According to one embodiment of the application, the water system comprises a water supply pipeline, a second path of the second heat exchanger and a water return pipeline connected in sequence; the water supply pipeline and the water return pipeline are used to communicate with a water using device; a first path of the second heat exchanger is used to perform heat exchange with the second path of the second heat exchanger; a buffer water tank and a water pump are sequentially arranged on the water supply pipeline or the water return pipeline, and the buffer water tank is provided with a heating element;

[0008] A first control valve is arranged at the end of the water supply pipeline, a second control valve is arranged at the end of the water return pipeline, and an internal circulation pipeline is arranged between the water supply pipeline and the water return pipeline, and a third control valve is arranged on the internal circulation pipeline;

[0009] The water system is configured to open the third control valve when the first control valve and the second control valve are closed, or to close the third control valve when the first control valve and the second control valve are opened.

[0010] According to an embodiment of the present application, the first control valve, the second control valve and the third control valve are all electric ball valves.

[0011] According to an embodiment of the present application, the buffer water tank is sequentially provided with a water inlet and a water outlet from top to bottom, the water inlet is communicated with the water supply pipeline, and the water outlet is communicated with the water return pipeline.

[0012] According to an embodiment of the present application, the buffer water tank is further provided with a water supplement inlet, the water supplement inlet is arranged between the water inlet and the water outlet, and an automatic water supplement valve is connected to the water supplement inlet, the automatic water supplement valve is adapted to be communicated with an external pipeline.

[0013] According to an embodiment of the present application, a differential pressure bypass pipeline is further arranged between the water supply pipeline and the water return pipeline, and a differential pressure bypass valve is arranged on the differential pressure bypass pipeline.

[0014] According to an embodiment of the present application, the refrigerant system further comprises a vapor-liquid separator, which is respectively connected with the compressor and the reversing valve pipeline.

[0015] According to an embodiment of the present application, the first expansion valve is an electronic expansion valve, and the second expansion valve is an enthalpy-increasing electronic expansion valve.

[0016] According to an embodiment of the present application, one side of the first heat exchanger is provided with a fan, and the reversing valve is a four-way reversing valve.

[0017] According to an embodiment of the present application, the second heat exchanger is a plate heat exchanger.

[0018] The above one or more technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0019] The application discloses a heat pump host system, comprising: a refrigerant system and a water system, a circulating cold carrier in the refrigerant system and a circulating liquid medium in the water system exchange heat in a second heat exchanger; the refrigerant system comprises a compressor, a reversing valve, a first heat exchanger, a first expansion valve and a vapor-liquid separator, the compressor, the reversing valve, the first heat exchanger and the first expansion valve are sequentially connected by pipelines, and the vapor-liquid separator is respectively connected with the compressor and the reversing valve by pipelines; the refrigerant system is further provided with a second expansion valve and an economizer; the first expansion valve is respectively connected with a first pipeline and a second pipeline, the first pipeline passes through the second expansion valve and a second path of the economizer and is connected to the compressor, and the second pipeline passes through a first path of the economizer, the first heat exchanger and is connected to the reversing valve. The heat pump host system has high integration degree and comprehensive functions, high-temperature and high-pressure gaseous cold carrier is generated by the compressor, and the system can be selected and switched between a refrigeration mode, a first heating mode and a second heating mode according to requirements, so as to adapt to the use requirements in different use scenarios.

[0020] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and / or additional aspects and advantages of the application will become apparent and be readily appreciated from the description of the embodiments, which follows, including the accompanying drawings.

[0022] Figure 1 is a structural schematic diagram of a heat pump host system provided by an embodiment of the application;

[0023] Figure 2 is a schematic diagram of the flow direction of the cold carrier in the heat pump host system provided by the embodiment of the application in the refrigeration mode;

[0024] Figure 3 is a schematic diagram of the flow direction of the cold carrier in the heat pump host system provided by the embodiment of the application in the first heating mode;

[0025] Figure 4 is a schematic diagram of the flow direction of the cold carrier in the heat pump host system provided by the embodiment of the application in the second heating mode;

[0026] Figure 5 is a schematic diagram of the flow direction of the water in the heat pump host system provided by the embodiment of the application in the defrosting mode.

[0027] REFERENCE SIGNS:

[0028] 1, refrigerant system;

[0029] 10, first pipeline; 11, first heat exchanger; 111, fan; 12, first expansion valve; 13, economizer; 131, first path of the economizer; 14, second heat exchanger; 141, first path of the second heat exchanger; 20, second pipeline; 30, second expansion valve; 132, second path of the economizer; 40, compressor; 41, first gas inlet of the compressor; 42, second gas inlet of the compressor; 43, gas outlet of the compressor; 50, reversing valve; 60, gas-liquid separator;

[0030] 2, water system;

[0031] 21, water supply pipeline; 211, first control valve; 142, second path of the second heat exchanger; 22, water return pipeline; 221, second control valve; 23, buffer tank; 231, heating element; 232, automatic water replenishment valve; 24, water pump; 25, internal circulation pipeline; 251, third control valve; 26, differential pressure conduction pipeline; 261, differential pressure bypass valve; 27, expansion tank. DETAILED DESCRIPTION

[0032] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the present application, and cannot be understood as limiting the present application.

[0033] Reference is made below to Figures 1-5 A heat pump host system according to an embodiment of the present application is described.

[0034] As Figure 1 shown, the heat pump host system includes: a refrigerant system 1 and a water system 2.

[0035] The refrigerant system 1 can be thermally coupled with the water system 2 through the second heat exchanger 14, thereby regulating the temperature of the liquid medium (such as water) in the water system 2, realizing the functions of refrigeration or heating.

[0036] Specifically, the refrigerant system 1 includes: a compressor 40, a reversing valve 50, a first expansion valve 12, and a gas-liquid separator 60.

[0037] The compressor 40, the reversing valve 50, the first heat exchanger 11, and the first expansion valve 12 are sequentially connected in pipeline.

[0038] The refrigerant system 1 further includes: a second expansion valve 30 and an economizer 13.

[0039] The first expansion valve 12 is connected with the first pipeline 10 and the second pipeline 20 respectively, the first pipeline 10 passes through the second expansion valve 30, the second path 132 of the economizer and is connected to the compressor, and the second pipeline 20 passes through the first path 131 of the economizer, the first heat exchanger 11 and is connected to the reversing valve 50.

[0040] The compressor 40 has a first gas inlet 41, a second gas inlet 42 and a gas outlet 43.

[0041] It should be noted that the first gas inlet 41 of the compressor is a main gas inlet for receiving gaseous refrigerant; the second gas inlet 42 of the compressor is a supplementary gas inlet for allowing additional gaseous refrigerant to enter under certain use scenarios; and the gas outlet 43 of the compressor is an exhaust port of high-temperature and high-pressure gaseous refrigerant after compression.

[0042] The first gas inlet 41 of the compressor is connected with the second path 132 of the economizer, the second gas inlet 42 of the compressor is connected with the reversing valve 50 through the vapor-liquid separator 60, and the gas outlet 43 of the compressor is connected with the reversing valve 50.

[0043] The reversing valve 50 is connected between the first path of the first heat exchanger 11 and the first path 141 of the second heat exchanger, and is used to switch the communication of the first path of the first heat exchanger 11 or the first path 141 of the second heat exchanger.

[0044] The water system 2 includes a water supply pipeline 21, the first path 142 of the second heat exchanger and a water return pipeline 22 connected in sequence; the water supply pipeline 21 and the water return pipeline 22 are used to communicate with water-using equipment; and the first path 141 of the second heat exchanger is used to exchange heat with the first path 142 of the second heat exchanger.

[0045] As shown in Figure 2 , when the reversing valve 50 is switched to make the gas outlet 43 of the compressor communicate with the first path of the first heat exchanger 11, and the first gas inlet 41 of the compressor communicates with the first path 141 of the second heat exchanger through the vapor-liquid separator 60, the heat pump main system has a refrigeration mode.

[0046] As shown in Figure 3 and Figure 4 , when the reversing valve 50 is switched to make the gas outlet 43 of the compressor communicate with the first path 141 of the second heat exchanger, and the first gas inlet 41 of the compressor communicates with the first path of the first heat exchanger 11 through the vapor-liquid separator 60, the heat pump main system has a first heating mode and a second heating mode.

[0047] The flow direction of the refrigerant in the refrigeration mode, the first heating mode and the second heating mode will be introduced below.

[0048] As shown in Figure 2As shown, in the refrigeration mode: the compressor 40 generates a high-temperature and high-pressure gaseous refrigerant, which enters the first path of the first heat exchanger 11 through the reversing valve 50. The refrigerant flowing through the first path of the first heat exchanger 11 exchanges heat with the water flowing through the second path of the first heat exchanger 11, so that the temperature of the refrigerant decreases after releasing heat.

[0049] The refrigerant then undergoes throttling and pressure reduction through the first expansion valve 12, flows through the first path 131 of the economizer, enters the first path 141 of the second heat exchanger, and exchanges heat with the first path 142 of the second heat exchanger of the water system 2, thereby lowering the water temperature in the first path 142 of the second heat exchanger of the water system 2 to achieve the purpose of refrigeration; then it enters the vapor-liquid separator 60 through the reversing valve 50 to remove the liquid refrigerant, and the gaseous refrigerant returns to the second air inlet 42 of the compressor.

[0050] In this embodiment, the first path 141 of the second heat exchanger of the refrigerant system 1 is thermally coupled with the first path 142 of the second heat exchanger of the water system 2, thereby lowering the temperature of the water in the water system 2 and achieving the cooling function.

[0051] like Figure 3 As shown, in the first heating mode: the second expansion valve 30 is closed, the compressor 40 generates a high-temperature and high-pressure gaseous refrigerant, which enters the first path 141 of the second heat exchanger through the reversing valve 50 and exchanges heat with the first path 142 of the second heat exchanger of the water system 2, so as to raise the water temperature of the first path 142 of the second heat exchanger of the water system 2 and achieve the purpose of heating.

[0052] The refrigerant then flows through the first path 131 of the economizer, and after being throttled and depressurized by the first expansion valve 12, it enters the first path of the first heat exchanger 11 and exchanges heat with the water flowing through the second path of the first heat exchanger 11, causing the refrigerant to release heat and lower its temperature. Then it enters the vapor-liquid separator 60 through the reversing valve 50 to remove the liquid refrigerant, and the gaseous refrigerant returns to the second air inlet 42 of the compressor.

[0053] In this embodiment, the first path 141 of the second heat exchanger of the refrigerant system 1 is thermally coupled to the first path 142 of the second heat exchanger of the water system 2, thereby raising the temperature of the water in the water system 2 and realizing the heating function.

[0054] like Figure 4 As shown, in the second heating mode: the second expansion valve 30 opens, the compressor 40 generates a high-temperature and high-pressure gaseous refrigerant, which enters the first path 141 of the second heat exchanger through the reversing valve 50 and exchanges heat with the first path 142 of the second heat exchanger of the water system 2, so as to raise the water temperature of the first path 142 of the second heat exchanger of the water system 2 and achieve the purpose of heating.

[0055] After that, the cold carrier flows through the first path 131 of the economizer, and at this time, the cold carrier is divided into two paths.

[0056] One path of the cold carrier enters the first path of the first heat exchanger 11 after throttling by the first expansion valve 12, and exchanges heat with the water flowing through the second path of the first heat exchanger 11, so that the cold carrier releases heat and the temperature decreases; then it enters the vapor-liquid separator 60 through the reversing valve 50 to remove the liquid cold carrier, and the gaseous cold carrier returns to the second inlet 42 of the compressor.

[0057] The other path of the cold carrier enters the second path 132 of the economizer through the second expansion valve 30, and exchanges heat with the cold carrier of the first path 131 of the economizer. The cold carrier flowing through the second path 132 of the economizer absorbs the heat of the cold carrier flowing through the first path 131 of the economizer, so that the temperature of the cold carrier of the first path 131 of the economizer decreases, and the enthalpy of the cold carrier of the second path 132 of the economizer increases. After entering from the first inlet 41 of the compressor, it provides the effect of supplementing the gas for the compressor 40, realizing the effect of increasing the enthalpy.

[0058] In this embodiment, the enthalpy of the cold carrier is increased by the way of supplementing the gas, so that the intake amount of the compressor 40 and the heating capacity are increased. When the first path 141 of the second heat exchanger of the refrigerant system 1 is coupled with the first path 142 of the second heat exchanger of the water system 2, the temperature rising effect of the water in the water system 2 is better, and the heating effect is better.

[0059] It should be noted that in the above embodiments, the cold carrier can be freon, and the cold carrier can contain liquid that is not completely gasified. If these liquids directly enter the compressor 40, it will cause liquid strike of the compressor 40, damage the compressor 40, and through the vapor-liquid separator 60, the liquid in the cold carrier is separated out, to ensure that the gaseous cold carrier enters the compressor 40, so as to protect the compressor 40 from liquid strike damage and prolong its service life.

[0060] In summary, in the above embodiments of the present application, the refrigerant system 1 and the water system 2 are integrated in the heat pump host system, and the integration degree of each component in the refrigerant system 1 is high and the function is comprehensive. The selection and switching of the refrigeration mode, the first heating mode and the second heating mode can be realized to adapt to the use requirements in different use scenarios.

[0061] In actual execution, the first expansion valve 12 can be an electronic expansion valve or a thermal expansion valve, and the second expansion valve 30 can be an enthalpy-increasing electronic expansion valve.

[0062] In actual execution, one side of the first heat exchanger 11 is provided with a fan 111; and the reversing valve 50 is a four-way reversing valve 50.

[0063] In actual execution, the second heat exchanger 14 is a plate heat exchanger.

[0064] As Figure 5 shown, in some embodiments, the water supply pipeline 21 or the water return pipeline 22 is sequentially provided with a buffer water tank 23 and a water pump 24, and the buffer water tank 23 is provided with a heating element 231;

[0065] The end of the water supply pipeline 21 is provided with a first control valve 211, the end of the water return pipeline 22 is provided with a second control valve 221, and the water supply pipeline 21 and the water return pipeline 22 are provided with an internal circulation pipeline 25, and the internal circulation pipeline 25 is provided with a third control valve 251.

[0066] The water system 2 is configured to open the third control valve 251 when the first control valve 211 and the second control valve 221 are closed, or to close the third control valve 251 when the first control valve 211 and the second control valve 221 are opened.

[0067] As Figure 4 shown, when the third control valve 251 is closed and the first control valve 211 and the second control valve 221 are opened, the refrigerant system 1 can be coupled with the water system 2 through the heat exchanger, thereby regulating the temperature of the water in the water system 2 and realizing the function of heating.

[0068] As Figure 5 shown, when the third control valve 251 is opened and the first control valve 211 and the second control valve 221 are closed, the water supply pipeline 21 and the water return pipeline 22 are disconnected from the water-using equipment. At the same time, the water system 2 has a defrosting mode, and the flow direction of water in the defrosting mode is introduced below.

[0069] In the defrosting mode: water enters the buffer water tank 23 from the third control valve 251, and after being pushed by the water pump 24, it enters the first path 142 of the second heat exchanger. During the above process, the heating element 231 in the buffer water tank 23 can be turned on to provide additional heat energy for the water, which helps to defrost efficiently; after the water is heated, it returns from the third control valve 251, forming an internal circulation, until the defrosting is completed.

[0070] It should be noted that this design only affects the water system 2 inside the heat pump main system during the defrosting process, and does not involve the water circulation at the user end, thereby avoiding the problem of water temperature fluctuation at the user end.

[0071] In actual implementation, the first control valve 211, the second control valve 221 and the third control valve 251 can be electric ball valves, manual ball valves and pneumatic ball valves.

[0072] In actual implementation, the buffer water tank 23 is sequentially provided with a water inlet and a drain from top to bottom, the water inlet is communicated with the water supply pipeline 21, and the drain is communicated with the water return pipeline 22.

[0073] In some embodiments, the buffer tank 23 is also provided with a water inlet, which is located between the water inlet and the water outlet, and an automatic water supply valve 232 is connected to the water inlet. The automatic water supply valve 232 is adapted to be connected to an external pipeline.

[0074] In this embodiment, the automatic water supply valve 232 is normally closed. When the water volume in the water system 2 is insufficient, it automatically opens by relying on the pressure difference between the tap water and the water system 2, so as to realize automatic water supply to the water system 2.

[0075] like Figure 5 As shown, in some embodiments, a differential pressure conduction pipeline 26 is provided between the water supply pipeline 21 and the return water pipeline 22, and a differential pressure bypass valve 261 is provided on the differential pressure conduction pipeline 26.

[0076] In this embodiment, when the pressure difference in water system 2 is too large, it may damage water pump 24 or other components, causing the system to malfunction. The differential pressure bypass valve 261 in water system 2 is designed to provide a bypass when the pressure is abnormal. When the pressure difference between the return water and supply water in water system 2 is too large, it will automatically open to alleviate the pressure difference in water system 2, thereby protecting the components of water system 2.

[0077] In actual operation, an expansion tank 27 is provided between the buffer water tank 23 and the water pump 24.

[0078] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0079] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0080] In the description of the application, "first feature", "second feature" can include one or more of the features.

[0081] In the description of the application, "a plurality of" means two or more.

[0082] In the description of the application, "on" or "under" the first feature in the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them.

[0083] In the description of the application, "on", "above" and "over" the first feature in the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher than the second feature in horizontal height.

[0084] In the description of the application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the description of the application, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0085] Although the embodiments of the application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the application, and the scope of the application is defined by the claims and their equivalents.

Claims

1. A heat pump host system, characterized by, The application relates to a refrigerant system and a water system, wherein a circulating cold carrier in the refrigerant system exchanges heat with a liquid medium circulating in the water system in a second heat exchanger. The refrigerant system comprises a compressor, a reversing valve, a first heat exchanger and a first expansion valve, which are sequentially connected by pipelines. The refrigerant system is further provided with a second expansion valve and an economizer; the first expansion valve is connected with a first pipeline and a second pipeline respectively; the first pipeline passes through the second expansion valve, a second path of the economizer and is connected to the compressor; the second pipeline passes through a first path of the economizer, a first path of the second heat exchanger, the reversing valve and is connected to the compressor. The water system comprises a water supply pipeline, a second path of the second heat exchanger and a water return pipeline which are sequentially connected; the water supply pipeline and the water return pipeline are used for communicating with a water-using device; a first path of the second heat exchanger is used for exchanging heat with the second path of the second heat exchanger; a buffer water tank and a water pump are sequentially arranged on the water supply pipeline or the water return pipeline; the buffer water tank is provided with a heating element; 2. The heat pump host system according to claim 1, characterized by The end of the water supply pipeline is provided with a first control valve, the end of the water return pipeline is provided with a second control valve, and an internal circulation pipeline is arranged between the water supply pipeline and the water return pipeline; a third control valve is arranged on the internal circulation pipeline; The water system is configured to open the third control valve when the first control valve and the second control valve are closed; or close the third control valve when the first control valve and the second control valve are opened. The first control valve, the second control valve and the third control valve are all electric ball valves.

3. The heat pump host system of claim 2, wherein, The buffer water tank is sequentially provided with a water inlet and a water outlet from top to bottom; the water inlet communicates with the water supply pipeline; and the water outlet communicates with the water return pipeline.

4. The heat pump host system of claim 2, wherein, The buffer water tank is further provided with a water supplement port; the water supplement port is arranged between the water inlet and the water outlet; an automatic water supplement valve is connected to the water supplement port; and the automatic water supplement valve is adapted to communicate with an external pipeline.

5. The heat pump host system according to claim 4, wherein, A differential pressure bypass pipeline is further arranged between the water supply pipeline and the water return pipeline; and a differential pressure bypass valve is arranged on the differential pressure bypass pipeline.

6. The heat pump host system of claim 2, wherein, The refrigerant system further comprises a vapor-liquid separator which is connected with the compressor and the reversing valve by pipelines respectively.

7. The heat pump host system of claim 1, wherein, The first expansion valve is an electronic expansion valve; and the second expansion valve is an enthalpy-increasing electronic expansion valve.

8. The heat pump host system of claim 1, wherein, One side of the first heat exchanger is provided with a fan; and / or the reversing valve is a four-way reversing valve.

9. The heat pump host system of claim 1, wherein, The second heat exchanger is a plate heat exchanger.

10. The heat pump host system of claim 1, wherein, ​

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