Transcritical carbon dioxide heat pump system

Abstract

The invention relates to the field of heat pump systems, and provides a transcritical carbon dioxide heat pump system which comprises a first heat exchange circulation system, a second heat exchange circulation system, a control device and a photovoltaic power generation system. On-off of the first heat exchange system and the second heat exchange system can be changed through the control device according to actual use conditions, so that switching and complementation of an air source and a ground source are achieved, the influence of environment temperature changes on the heat pump system can be reduced, underground temperature unbalance caused by excessive use of the ground source can be avoided, the heat exchange effect of the system is fully guaranteed, and the service life of the system is prolonged. And the system can operate efficiently. The carbon dioxide cycle working medium is adopted, the good environment-friendly performance is achieved, the carbon dioxide utilization rate is increased, and the carbon dioxide emission pressure is relieved. And meanwhile, green power such as photovoltaic power generation is supplied to the transcritical carbon dioxide system for operation, and in-situ absorption of new energy is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of heat pump systems, and in particular to a transcritical carbon dioxide heat pump system. Background Art

[0002] With the increasing use of natural energy supplies such as air sources and ground sources, the technology of natural resource utilization is also continuously improving and developing. At the same time, the rapid development of heat pump technology has also promoted the development of natural energy more and more perfect. Among them, ground source heat pumps use shallow underground geothermal resources such as soil, groundwater, surface water, low-temperature geothermal water and tail water as heat sources to achieve heating, prepare domestic hot water, etc. However, long-term use will cause the problem of "soil thermal imbalance", resulting in a decrease in the heat exchange effect of the ground source heat pump, affecting its normal use.

[0003] Air source heat pumps use gas as a low-level heat source for heating or hot water supply, and can also be used for cooling. However, since air is used as a low-level heat source, it is greatly affected by the ambient temperature, and the heat exchange efficiency decreases in low-temperature environments.

[0004] In recent years, the massive consumption of energy and serious environmental pollution have become important issues that people are increasingly concerned about. Winter heating accounts for a large proportion of energy consumption, and traditional synthetic refrigerants such as Freon have brought huge burdens and damage to the environment, with high ozone depletion potential (ODP) and global warming potential (GWP). With the gradual elimination of refrigerants such as Freon, carbon dioxide, as an environmentally friendly natural working fluid, has gradually received widespread attention.

[0005] Therefore, based on different needs, it becomes very meaningful to provide a new type of heat pump system and consider how to overcome the defects of the existing heat pump systems and give full play to their respective advantages. Summary of the invention

[0006] The object of the present invention is to provide a transcritical carbon dioxide heat pump system to at least solve one of the problems existing in the prior art.

[0007] In order to achieve the above object, the present invention provides a transcritical carbon dioxide heat pump system, comprising:

[0008] A carbon dioxide compressor, an air cooler, an expansion valve and an evaporator are arranged in sequence and connected end to end to form a first heat exchange circulation system;

[0009] a geothermal heat exchanger arranged in parallel with the evaporator, the geothermal heat exchanger being arranged between the outlet of the expansion valve and the inlet of the carbon dioxide compressor to form a second heat exchange circulation system; wherein the heat exchange medium of the first heat exchange circulation system and the second heat exchange circulation system is carbon dioxide;

[0010] A control device, used to control the on / off status of the first heat exchange circulation system and the second heat exchange circulation system;

[0011] The photovoltaic power generation system is used to supply power to the first heat exchange circulation system and the second heat exchange circulation system.

[0012] The transcritical carbon dioxide heat pump system provided by the present invention further includes:

[0013] An energy storage device is electrically connected to the photovoltaic power generation system, and the energy storage device is used to store and release the electrical energy generated by the photovoltaic power generation system.

[0014] According to the transcritical carbon dioxide heat pump system provided by the present invention, the control device comprises:

[0015] A first branch and a second branch are arranged in parallel, and are arranged between the outlet of the expansion valve and the inlet of the carbon dioxide compressor, the evaporator is located on the first branch, and the geothermal heat exchanger is located on the second branch;

[0016] A first regulating valve is arranged on the first branch, and the first regulating valve is used to control the flow rate of the heat exchange medium in the first branch;

[0017] A second regulating valve is arranged on the second branch, and the second regulating valve is used to control the flow rate of the heat exchange medium in the second branch.

[0018] The transcritical carbon dioxide heat pump system provided by the present invention further includes:

[0019] A hot water storage device is used to store hot water. The air cooler includes a first heat exchange path and a second heat exchange path for exchanging heat with each other. The first heat exchange path is connected to an external water source and an inlet of the hot water storage device respectively. The second heat exchange path is arranged in the first heat exchange circulation system and the second heat exchange circulation system.

[0020] The transcritical carbon dioxide heat pump system provided by the present invention further includes:

[0021] A regenerator is arranged at the inlet of the carbon dioxide compressor, and the regenerator includes a third heat exchange passage and a fourth heat exchange passage for exchanging heat with each other, the third heat exchange passage is connected to the external water source and the first heat exchange passage respectively, and the fourth heat exchange passage is arranged in the first heat exchange circulation system and the second heat exchange circulation system.

[0022] The transcritical carbon dioxide heat pump system provided by the present invention further includes:

[0023] A gas-liquid separator, arranged at the outlet of the expansion valve;

[0024] A flash valve is connected to the gas phase outlet of the gas-liquid separator and the inlet of the carbon dioxide compressor respectively.

[0025] The transcritical carbon dioxide heat pump system provided by the present invention further includes:

[0026] A carbon dioxide working medium pump is connected to the liquid phase outlet of the gas-liquid separator, and the carbon dioxide working medium pump is used to provide power for the flow of liquid heat exchange working medium.

[0027] The transcritical carbon dioxide heat pump system provided by the present invention further includes a flow monitoring device, wherein the flow monitoring device includes:

[0028] A first flow meter is arranged between the inlet of the gas-liquid separator and the outlet of the expansion valve;

[0029] The second flow meter is arranged at the liquid phase outlet of the gas-liquid separator.

[0030] The transcritical carbon dioxide heat pump system provided by the present invention further includes:

[0031] The third regulating valve is arranged on the connecting pipeline between the air cooler and the hot water storage device, and the third regulating valve is used to control the flow of the connecting pipeline.

[0032] According to the transcritical carbon dioxide heat pump system provided by the present invention, the photovoltaic power generation system includes a solar panel, a voltage converter and a power distribution device connected in sequence, and the voltage converter and the power distribution device are both electrically connected to the energy storage device.

[0033] The transcritical carbon dioxide heat pump system provided by the present invention comprises: a carbon dioxide compressor, an air cooler, an expansion valve and an evaporator which are arranged in sequence and connected end to end to form a first heat exchange circulation system; a geothermal heat exchanger which is arranged in parallel with the evaporator and is arranged between the outlet of the expansion valve and the inlet of the carbon dioxide compressor to form a second heat exchange circulation system; wherein the heat exchange medium of the first heat exchange circulation system and the second heat exchange circulation system is carbon dioxide; a control device which is used to control the on / off status of the first heat exchange circulation system and the second heat exchange circulation system; and a photovoltaic power generation system which is used to supply power to the first heat exchange circulation system and the second heat exchange circulation system.

[0034] With such a setting, the control device can change the on and off of the first and second heat exchange systems according to the actual use situation, thereby realizing the switching and complementarity of the two heat sources of air source and ground source, which can not only reduce the impact of ambient temperature changes on the heat pump system, but also avoid excessive use of geothermal sources, resulting in underground temperature imbalance, fully guarantee the heat exchange effect of the system, and make the system run efficiently. And the use of carbon dioxide circulating working fluid has good environmental performance, improves the utilization rate of carbon dioxide, and alleviates the pressure of carbon dioxide emissions. At the same time, the use of green electricity such as photovoltaic power generation to supply the transcritical carbon dioxide system operation is conducive to promoting the in-situ consumption of new energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is a structural schematic diagram of the transcritical carbon dioxide heat pump system provided by the present invention;

[0037] Reference numerals:

[0038] 1: CO2 compressor; 2: air cooler; 3: expansion valve; 4: gas-liquid separator; 5: CO2 working fluid pump; 6: geothermal heat exchanger; 7: evaporator; 8: regenerator; 9: hot water storage device; 10: second regulating valve; 11: first regulating valve; 12: flash valve; 13: third regulating valve; 14: first flow meter; 15: second flow meter; 16: solar panel; 17: voltage converter; 18: power distribution device; 19: energy storage device; 20: first branch; 21: second branch; 22: external water source; 23: connecting pipeline. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Combine the following Figure 1 The transcritical carbon dioxide heat pump system of the present invention is described.

[0041] like Figure 1As shown, the embodiment of the present invention provides a transcritical carbon dioxide heat pump system, including a carbon dioxide compressor 1, an air cooler 2, an expansion valve 3, an evaporator 7, a geothermal heat exchanger 6, a control device, and a photovoltaic power generation system. Specifically, as Figure 1 As shown, the geothermal heat exchanger 6 is arranged in parallel with the evaporator 7, and is located between the outlet of the expansion valve 3 and the inlet of the carbon dioxide compressor 1. Among them, the expansion valve 3 can be an electronic expansion valve, which is easy to control. The geothermal heat exchanger 6 can be a U-shaped coaxial heat exchanger to exchange heat with the underground heat source. It adopts a vertical buried pipe method, which occupies a small area and excavation amount, has a high heat exchange capacity, and has a relatively low investment cost.

[0042] Specifically, the carbon dioxide compressor 1, the air cooler 2, the expansion valve 3 and the evaporator 7 are arranged in sequence and connected end to end to form a first heat exchange circulation system. At the same time, the carbon dioxide compressor 1, the air cooler 2, the expansion valve 3 and the geothermal heat exchanger 6 are arranged in sequence and connected end to end to form a second heat exchange circulation system. The control device is used to control the on-off status of the first heat exchange circulation system and the second heat exchange circulation system, and switch the two systems. In this way, a heat pump system coupled with an air source and a ground source can be constructed, and the corresponding heat source can be selected according to different needs to realize the switching of the two heat sources of air source and ground source. For example, when the ambient temperature is low in winter, it can be switched to the ground source heat pump system to maintain the heating demand of the system. When the underground soil temperature is unbalanced and deviates greatly, it can be switched to the air source heat pump system, and after the soil temperature field is restored, the ground source heat pump system can be restarted. Thereby, the system is reasonably configured and adjusted to ensure the heat exchange efficiency of the transcritical carbon dioxide heat pump system.

[0043] It should be noted that the heat exchange working fluid of the first heat exchange circulation system and the second heat exchange circulation system is carbon dioxide. The ODP of carbon dioxide is 0, which has no effect on the destruction of the ozone layer; the GWP is 1, which is an environmentally friendly natural working fluid. Carbon dioxide has stable physical and chemical properties, is not flammable and explosive, has a large refrigeration capacity per unit volume, and a small system volume; the viscosity in the transcritical state is low, the heat exchange performance is good, and the system pressure drop is small; at the same time, it has good temperature glide characteristics, which can meet the efficient operation of the system under a large temperature span. In this way, using carbon dioxide as the circulating working fluid of the heat pump system is an effective way to absorb geothermal heat and air heat, which is energy-saving and environmentally friendly.

[0044] At the same time, the photovoltaic power generation system is used to supply power to the first heat exchange circulation system and the second heat exchange circulation system. For example, it can be used as a power source for electrical equipment such as the carbon dioxide compressor 1, the electronic expansion valve, and the evaporator fan, so that photovoltaic power generation can be coupled with the heat pump system, and photovoltaic power generation can be used instead of traditional fossil energy power generation. The carbon dioxide heat pump system can be powered by green electricity, which can make full use of new energy power generation and carry out on-site consumption.

[0045] With such a setting, the control device can change the on and off of the first and second heat exchange systems according to the actual use situation, thereby realizing the switching and complementarity of the two heat sources of air source and ground source, which can not only reduce the impact of ambient temperature changes on the heat pump system, but also avoid excessive use of geothermal sources, resulting in underground temperature imbalance, fully guarantee the heat exchange effect of the system, and make the system run efficiently. And the use of carbon dioxide circulating working fluid has good environmental performance, improves the utilization rate of carbon dioxide, and alleviates the pressure of carbon dioxide emissions. At the same time, the use of green electricity such as photovoltaic power generation to supply the transcritical carbon dioxide system operation is conducive to promoting the in-situ consumption of new energy.

[0046] In an embodiment of the present invention, the transcritical carbon dioxide heat pump system also includes an energy storage device 19, which is electrically connected to the photovoltaic power generation system, and the energy storage device 19 is used to store and release the electrical energy generated by the photovoltaic power generation system. Specifically, the energy storage device 19 can use existing physical energy storage and chemical energy storage forms, such as compressed air energy storage, lithium battery energy storage, carbon dioxide energy storage, etc. With this arrangement, when photovoltaic power generation is in excess, the excess electrical energy can be stored in the energy storage device 19 to be released again when power generation is insufficient. Thereby, the problems of intermittent, instability and susceptibility to environmental influences of photovoltaic power generation can be solved to a large extent, the volatility of power supply can be reduced, the stable output of photovoltaic power generation can be achieved, and the peak and valley changes of electricity consumption on the user side can be effectively adjusted.

[0047] In a specific embodiment of the present invention, the control device includes a first branch 20, a first regulating valve 11, a second branch 21, and a second regulating valve 10. Figure 1 As shown, the first branch 20 and the second branch 21 are arranged in parallel, and are located between the outlet of the expansion valve 3 and the inlet of the carbon dioxide compressor 1. The evaporator 7 and the first regulating valve 11 are arranged on the first branch 20, and the first regulating valve 11 is used to control the flow rate of the heat exchange medium in the first branch 20. The geothermal heat exchanger 6 and the second regulating valve 10 are arranged on the second branch 21, and the second regulating valve 10 is used to control the flow rate of the heat exchange medium in the second branch 21. In this arrangement, the on-off state of the two heat source systems can be changed through the first and second regulating valves, the system heat source is fully utilized, the heat exchange effect is guaranteed, and the flow rate of the heat exchange medium in the corresponding branch can be adjusted according to the user's heat exchange needs, to meet the different needs of the user and ensure the efficient and reliable operation of the system.

[0048] As an optional embodiment of the present invention, the transcritical carbon dioxide heat pump system also includes a hot water storage device 9 for storing hot water. For example, it can be designed in the form of a hot water tank, and its capacity can be specifically determined according to actual use requirements. The air cooler 2 includes a first heat exchange path and a second heat exchange path for exchanging heat with each other. The first heat exchange path is connected to the external water source 22 and the inlet of the hot water storage device 9 respectively, and the second heat exchange path is arranged in the first heat exchange circulation system and the second heat exchange circulation system. In this way, by setting up the hot water storage device 9, the heat of the heat pump system can be fully recycled and utilized to prepare domestic hot water for users to use, thereby avoiding waste of resources and improving energy utilization.

[0049] Furthermore, in an embodiment of the present invention, the transcritical carbon dioxide heat pump system further includes a regenerator 8, which is arranged at the inlet of the carbon dioxide compressor 1. The regenerator 8 includes a third heat exchange path and a fourth heat exchange path for exchanging heat with each other, the third heat exchange path is connected to the external water source 22 and the first heat exchange path respectively, and the fourth heat exchange path is arranged in the first heat exchange circulation system and the second heat exchange circulation system. In this way, by arranging the regenerator 8, the heat of the gaseous working medium can be fully absorbed, the water can be preheated, and the gas entering the compressor can be made into superheated steam, thereby reducing harmful overheating, facilitating the operation of the compressor, and extending the service life of the compressor.

[0050] In an optional embodiment of the present invention, the transcritical carbon dioxide heat pump system further includes a gas-liquid separator 4 and a flash valve 12. Specifically, the gas-liquid separator 4 is in the form of a tank and is arranged at the outlet of the expansion valve 3. Thus, the mixed working medium after throttling is separated, the liquid working medium enters the subsequent evaporator 7 or the geothermal heat exchanger 6 for heat exchange, and the gaseous working medium can return to the carbon dioxide compressor 1 to enter the next cycle process. The flash valve 12 is respectively connected to the gas phase outlet of the gas-liquid separator 4 and the inlet of the carbon dioxide compressor 1, so that the gaseous working medium can be decompressed to reach the working pressure range of the compressor.

[0051] Furthermore, in the embodiment of the present invention, the transcritical carbon dioxide heat pump system further includes a carbon dioxide working medium pump 5, which is connected to the liquid phase outlet of the gas-liquid separator 4, and is used to provide power for the flow of the liquid heat exchange working medium. Thus, the liquid working medium in the gas-liquid separation tank is pressurized and transported to the evaporator 7 or the geothermal heat exchanger 6 through the carbon dioxide working medium pump 5, so as to realize the transportation of the circulating working medium and ensure the reliable and stable operation of the system cycle.

[0052] In an optional embodiment of the present invention, the transcritical carbon dioxide heat pump system further includes a flow monitoring device, which includes a first flow meter 14 and a second flow meter 15. The first flow meter 14 is arranged between the inlet of the gas-liquid separator 4 and the outlet of the expansion valve 3, and can monitor the total flow of the mixed working fluid. The second flow meter 15 is arranged at the liquid phase outlet of the gas-liquid separator 4, specifically, it can be installed at the outlet position of the carbon dioxide working fluid pump 5, and can monitor the flow of the liquid working fluid. Thus, the flow of carbon dioxide working fluid in different forms can be monitored in real time through the first flow meter 14 and the second flow meter 15, so as to avoid insufficient circulating working fluid and affect the heat exchange efficiency of the system. In addition, the transcritical carbon dioxide heat pump system also includes a temperature and pressure monitoring device, which specifically includes a number of temperature sensors and pressure sensors, which can be used to detect the inlet and outlet temperature and pressure of the carbon dioxide compressor 1, the outlet temperature of the air cooler 2, and the temperature and pressure in the gas-liquid separator 4, so as to ensure the safe and reliable operation of the system.

[0053] In a specific embodiment of the present invention, the transcritical carbon dioxide heat pump system further includes a third regulating valve 13, which is disposed on the connecting pipe 23 between the air cooler 2 and the hot water storage device 9, and is used to control the flow of the connecting pipe 23. Thus, the water flow can be adjusted by the third regulating valve 13 according to the user's hot water demand to control the heat exchange of the system, so that the system operates in a better state and ensures optimal resource allocation.

[0054] As an optional embodiment of the present invention, the photovoltaic power generation system includes a solar panel 16, a voltage converter 17 and a distribution device 18 connected in sequence. The voltage converter 17 can change the power supply voltage output by the solar panel 16 to meet the power demand of different loads. The distribution device 18 can select a commonly used power distribution cabinet, and the electric energy after voltage conversion is distributed to various power consumption points through the distribution cabinet for use. At the same time, the voltage converter 17 is electrically connected to the energy storage device 19 so that when there is excess electric energy, the electric energy is transmitted to the energy storage device 19 for storage. And the distribution device 18 is electrically connected to the energy storage device 19 so that when the electric energy supply is insufficient, the electric energy stored in the energy storage device 19 is transmitted to the distribution device 18, thereby meeting the power demand on the user side.

[0055] In summary, the embodiment of the present invention provides a transcritical carbon dioxide heat pump system, which uses natural environmentally friendly carbon dioxide as a refrigerant. Figure 1As shown, the carbon dioxide compressor 1 absorbs the gaseous carbon dioxide refrigerant from the gas-liquid separator 4 and the regenerator 8, and after being pressurized, it passes through the air cooler 2, the expansion valve 3, and the first flow meter 14 in sequence, and reaches the gas-liquid separator 4. Among them, the gaseous carbon dioxide enters the carbon dioxide compressor 1 through the flash valve 12. After the liquid carbon dioxide is pressurized by the carbon dioxide working fluid pump 5, if it is in the ground source mode, the system opens the second regulating valve 10 to enter the geothermal heat exchanger 6 to exchange heat with the ground source side; if it is in the air source mode, the system opens the first regulating valve 11 to enter the evaporator 7 to exchange heat with the air side. After completing the above heat exchange, it passes through the regenerator 8 again and enters the carbon dioxide compressor 1, thus completing a cycle process.

[0056] On the photovoltaic power supply side, the solar panel 16 is converted into 380V AC through the voltage converter 17. Part of the generated electricity is used as the power supply of the transcritical carbon dioxide heat pump system, such as powering the carbon dioxide compressor 1, the carbon dioxide working fluid pump 5, the air cooler fan, etc., to achieve in-situ consumption of photovoltaic power generation. The other part is stored in the energy storage device 19 for use when power generation is insufficient, thereby achieving the purpose of flexible peak regulation of photovoltaic power generation and realizing smooth output of photovoltaic power generation.

[0057] With this configuration, the heat source of the system comes from geothermal or air sources, which can be selected and switched based on demand, giving full play to the advantages of the system and improving the heat exchange efficiency of the system. Photovoltaic green electricity is used to supply the transcritical system operation, saving energy and reducing emissions, and promoting the in-situ consumption of new energy. At the same time, the coupling energy storage system is used for flexible peak regulation of photovoltaic power generation, reducing the volatility of power supply, and achieving stable output of the power supply system.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A transcritical carbon dioxide heat pump system, characterized in that: include: A carbon dioxide compressor, an air cooler, an expansion valve and an evaporator are arranged in sequence and connected end to end to form a first heat exchange circulation system; a geothermal heat exchanger arranged in parallel with the evaporator, the geothermal heat exchanger being arranged between the outlet of the expansion valve and the inlet of the carbon dioxide compressor to form a second heat exchange circulation system; wherein the heat exchange medium of the first heat exchange circulation system and the second heat exchange circulation system is carbon dioxide; A control device, used to control the on / off status of the first heat exchange circulation system and the second heat exchange circulation system; The photovoltaic power generation system is used to supply power to the first heat exchange circulation system and the second heat exchange circulation system.

2. The transcritical carbon dioxide heat pump system according to claim 1, characterized in that: Also includes: An energy storage device is electrically connected to the photovoltaic power generation system, and the energy storage device is used to store and release the electrical energy generated by the photovoltaic power generation system.

3. The transcritical carbon dioxide heat pump system according to claim 1, characterized in that: The control device comprises: A first branch and a second branch are arranged in parallel, and are arranged between the outlet of the expansion valve and the inlet of the carbon dioxide compressor, the evaporator is located on the first branch, and the geothermal heat exchanger is located on the second branch; A first regulating valve is arranged on the first branch, and the first regulating valve is used to control the flow rate of the heat exchange medium in the first branch; A second regulating valve is arranged on the second branch, and the second regulating valve is used to control the flow rate of the heat exchange medium in the second branch.

4. The transcritical carbon dioxide heat pump system according to claim 1, characterized in that: Also includes: A hot water storage device is used to store hot water. The air cooler includes a first heat exchange path and a second heat exchange path for exchanging heat with each other. The first heat exchange path is connected to an external water source and an inlet of the hot water storage device respectively. The second heat exchange path is arranged in the first heat exchange circulation system and the second heat exchange circulation system.

5. The transcritical carbon dioxide heat pump system according to claim 4, characterized in that: Also includes: A regenerator is arranged at the inlet of the carbon dioxide compressor, and the regenerator includes a third heat exchange passage and a fourth heat exchange passage for exchanging heat with each other, the third heat exchange passage is connected to the external water source and the first heat exchange passage respectively, and the fourth heat exchange passage is arranged in the first heat exchange circulation system and the second heat exchange circulation system.

6. The transcritical carbon dioxide heat pump system according to claim 1, characterized in that: Also includes: A gas-liquid separator, arranged at the outlet of the expansion valve; A flash valve is connected to the gas phase outlet of the gas-liquid separator and the inlet of the carbon dioxide compressor respectively.

7. The transcritical carbon dioxide heat pump system according to claim 6, characterized in that: Also includes: A carbon dioxide working medium pump is connected to the liquid phase outlet of the gas-liquid separator, and the carbon dioxide working medium pump is used to provide power for the flow of liquid heat exchange working medium.

8. The transcritical carbon dioxide heat pump system according to claim 6, characterized in that: It also includes a flow monitoring device, the flow monitoring device comprising: A first flow meter is arranged between the inlet of the gas-liquid separator and the outlet of the expansion valve; The second flow meter is arranged at the liquid phase outlet of the gas-liquid separator.

9. The transcritical carbon dioxide heat pump system according to claim 4, characterized in that: Also includes: The third regulating valve is arranged on the connecting pipeline between the air cooler and the hot water storage device, and the third regulating valve is used to control the flow of the connecting pipeline.

10. The transcritical carbon dioxide heat pump system according to claim 2, characterized in that: The photovoltaic power generation system comprises a solar cell panel, a voltage converter and a power distribution device which are connected in sequence, and the voltage converter and the power distribution device are both electrically connected to the energy storage device.

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