Cascade high temperature air source heat pump with pv / t defrosting device

Abstract

This utility model discloses a cascade high-temperature air source heat pump with a PV / T defrosting device, comprising a PV / T defrosting device connected to a cascade heat pump assembly via wires. The PV / T defrosting device includes a PV / T electrical defrosting unit and a PV / T thermal defrosting unit, the latter connected to the cascade heat pump assembly via wires, and the former cooperating with the latter. This utility model's cascade high-temperature air source heat pump with a PV / T defrosting device solves the problems of low heat pump efficiency and low energy utilization in traditional defrosting methods.

Description

Technical Field

[0001] This utility model belongs to the field of air source heat pump technology, specifically relating to a cascade high-temperature air source heat pump with a PV / T defrosting device. Background Technology

[0002] A heat pump is a device that transfers heat from a low-temperature heat source to a high-temperature heat source by consuming a small amount of external energy. This process is achieved using a reverse Carnot cycle. Unlike traditional heating equipment, its energy efficiency ratio is far higher than other devices. Driven by the "dual-carbon" policy, heat pump technology has received widespread attention. Among them, cascade heat pumps, with their unique two-stage cycle characteristics, break through the temperature rise limitations of traditional single-stage cycle heat pumps, enabling them to provide higher-temperature heat for industrial applications, thus leading to their development. In recent years, the utilization of renewable energy has become the mainstream direction of energy sector development. The integration of solar, wind, and geothermal energy with the heat pump industry is becoming increasingly common. With the development of PV / T (photovoltaic / thermal) materials, their ability to generate both electricity and heat allows for efficient integration with heat pumps. This not only reduces electricity consumption but also further improves the operating efficiency of heat pumps. The application of PV / T materials has already yielded significant results and is rapidly developing in the heat pump field.

[0003] Frosting is the most significant problem during heat pump operation. Air source heat pumps are prone to frost formation on the evaporator end in low-temperature environments. Frosting increases the thermal resistance of the evaporator fins and also increases air resistance, affecting evaporator efficiency and reducing unit performance. Traditional defrosting methods include electric auxiliary heating, hot gas bypass, and reverse circulation defrosting. However, traditional defrosting methods have the following problems: First, reverse cycle defrosting: switching the four-way valve to switch the heat pump to cooling mode and using the heat from the compressor exhaust to defrost. This method requires interrupting heating operation, consuming additional electricity and also using some heat for defrosting, which greatly reduces the working efficiency of the heat pump. Second, traditional electric auxiliary heating defrosting: requires additional electricity, leading to increased costs. Improper placement of the electric heating belt can significantly affect defrosting efficiency. Third, hot gas bypass defrosting: although it solves the problem of interrupting heating in reverse cycle defrosting, the defrosting speed is significantly delayed, and the energy utilization rate is reduced. Utility Model Content

[0004] The purpose of this invention is to provide a cascade high-temperature air source heat pump with a PV / T defrosting device, which solves the problems of low heat pump efficiency and low energy utilization in traditional defrosting methods.

[0005] The technical solution adopted in this utility model is a cascade high-temperature air source heat pump with a PV / T defrosting device, which includes a PV / T defrosting device and is connected to a cascade heat pump assembly via wires.

[0006] The features of this utility model also include: The PV / T defrosting device includes a PV / T electric defrosting unit and a PV / T thermal defrosting unit. The PV / T electric defrosting unit is connected to the cascade heat pump assembly via wires, and the PV / T thermal defrosting unit works in conjunction with the cascade heat pump assembly.

[0007] The PV / T electric defrosting unit includes a PV / T device, which is connected to a battery via wires. The battery is connected to an inverter via wires, and the inverter is connected to an electric heating belt via wires. The electric heating belt is mounted on the cascade heat pump assembly.

[0008] The PV / T thermal defrosting unit includes a heat storage pipe that passes through the PV / T device. The heat storage pipe is connected to a hot water storage tank at both ends. A first circulating water pump is installed on the heat storage pipe. The unit also includes a heating pipe that is connected to the hot water storage tank at both ends. A second circulating water pump is installed on the heating pipe. The heating pipe is located on one side of the cascade heat pump assembly. The unit also includes a fan. An inverter is connected to the fan via wires. The fan is located on the other side of the heating pipe and works in conjunction with the cascade heat pump assembly.

[0009] The cascade heat pump assembly includes an R134a heat exchange unit, a CO2 heat exchange unit, and an energy storage unit, which are connected in sequence.

[0010] The R134a heat exchange unit includes an R134a pipe, with finned heat exchangers connected to both ends of the R134a pipe. An electric heating belt is attached to the finned heat exchanger via thermally conductive gel. An R134a compressor and a first expansion valve are installed on the R134a pipe. An inverter is connected to the R134a compressor via wires. An intermediate heat exchanger is also installed on the R134a pipe between the R134a compressor and the first expansion valve. A CO2 heat exchange unit passes through the intermediate heat exchanger and works in conjunction with it.

[0011] Temperature and humidity sensors are installed on the finned heat exchanger.

[0012] The CO2 heat exchange unit includes a CO2 pipeline connected end to end to form a loop. The CO2 pipeline passes through an intermediate heat exchanger. A CO2 compressor and a second expansion valve are installed on the CO2 pipeline. An inverter is connected to the CO2 compressor via wires. A gas cooler is also installed between the CO2 compressor and the second expansion valve on the CO2 pipeline. An energy storage unit passes through the gas cooler and works in conjunction with the gas cooler.

[0013] The energy storage unit includes an energy storage pipeline that passes through a gas cooler and is connected to a water tank at both ends.

[0014] The beneficial effects of this utility model are: This utility model provides a cascade high-temperature air source heat pump with a PV / T defrosting device. The defrosting method enables efficient defrosting using self-sufficient electrical energy without interrupting heating. The device consists of a PV / T unit connected to an electric heating belt. The electric heating belt is spirally fixed to the heat exchanger fins using thermally conductive gel, increasing the contact area between the fins and the heating belt. The thermally conductive gel reduces thermal resistance, making its impact on the heat exchange capacity of the fins negligible. It also preheats the low-temperature refrigerant, improving the heat pump's efficiency. This cascade structure effectively combines the high-temperature exothermic characteristics of CO2 and the low-temperature endothermic characteristics of R134a, breaking through the temperature rise limitations of traditional single-stage heat pump units and achieving continuous and stable output of high-temperature working fluid. The photovoltaic layer of the PV / T unit is connected to a battery. When the electrical energy stored in the battery reaches the power required to start the compressor, it is directly supplied to the cascade compressor through inverter conversion, enabling self-sufficient operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the cascade high-temperature air source heat pump with PV / T defrosting device of this utility model.

[0016] In the diagram, 1. PV / T unit, 2. First circulating water pump, 3. Hot water storage tank, 4. Fan, 5. Second circulating water pump, 6. Electric heating belt, 7. Finned heat exchanger, 8. R134a compressor, 9. CO2 compressor, 10. Intermediate heat exchanger, 11. First expansion valve, 12. Second expansion valve, 13. Battery, 14. Inverter, 15. Water tank, 16. Gas cooler, 17. Temperature and humidity sensor, 18. Heat storage pipeline, 19. Heating pipeline, 20. R134a pipeline, 21. CO2 pipeline, 22. Energy storage pipeline. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0018] The cascade high-temperature air source heat pump with PV / T defrosting device provided by this utility model, such as Figure 1As shown, the system includes a PV / T defrosting device, which is connected to a cascade heat pump assembly via wires. The PV / T defrosting device comprises a PV / T electric defrosting unit and a PV / T thermal defrosting unit. The PV / T electric defrosting unit is connected to the cascade heat pump assembly via wires, and the PV / T thermal defrosting unit works in conjunction with the cascade heat pump assembly. The PV / T electric defrosting unit includes a PV / T device 1, which is connected to a battery 13 via wires. The battery 13 is connected to an inverter 14 via wires, and the inverter 14 is connected to an electric heating element 6 via wires. The electric heating element 6 is mounted on the cascade heat pump assembly. The PV / T thermal defrosting unit includes a heat storage pipe 18, which passes through the PV / T device 1. A heat storage tank 3 is connected to both ends of a heat storage pipe 18. A first circulating water pump 2 is installed on the heat storage pipe 18. A heating pipe 19 is also included, with both ends connected to the heat storage tank 3. A second circulating water pump 5 is installed on the heating pipe 19. The heating pipe 19 is located on one side of the cascade heat pump assembly. A fan 4 is also included. An inverter 14 is connected to the fan 4 via wires. The fan 4 is located on the other side of the heating pipe 19 and works in conjunction with the cascade heat pump assembly. The cascade heat pump assembly includes an R134a heat exchange unit, a CO2 heat exchange unit, and an energy storage unit, which are sequentially connected. The R134a heat exchange unit includes an R134a pipe 20, with both ends connected to the heat storage tank 3. A finned heat exchanger 7 is connected to the PV / T unit 1. The PV / T unit 1 generates electricity, which is then supplied to the fan 4. The fan 4 transfers heat from the air to the finned heat exchanger 7 via forced convection. The finned heat exchanger 7 enables heat exchange between two different refrigerants. An electric heating strip 6 is attached to the finned heat exchanger 7 via thermally conductive gel and is spirally fixed to the finned heat exchanger 7 by the thermally conductive gel. An R134a compressor 8 and a first expansion valve 11 are installed on the R134a pipe 20. An inverter 14 is connected to the R134a compressor 8 via wires. An intermediate heat exchanger 10 is also installed on the R134a pipe 20 between the R134a compressor 8 and the first expansion valve 11. A CO2 heat exchange unit passes through the intermediate heat exchanger 10. The heat exchanger unit is equipped with the intermediate heat exchanger 10; a temperature and humidity sensor 17 is installed on the finned heat exchanger 7; the CO2 heat exchanger unit includes a CO2 pipe 21, which is connected end to end to form a loop. The CO2 pipe 21 passes through the intermediate heat exchanger 10. A CO2 compressor 9 and a second expansion valve 12 are installed on the CO2 pipe 21. An inverter 14 is connected to the CO2 compressor 9 through a wire. A gas cooler 16 is also installed between the CO2 compressor 9 and the second expansion valve 12 on the CO2 pipe 21. An energy storage unit passes through the gas cooler 16 and is equipped with the gas cooler 16; the energy storage unit includes an energy storage pipe 22, which passes through the gas cooler 16. A water tank 15 is connected to both ends of the energy storage pipe 22.

[0019] This invention utilizes the combined heat and power (CHP) capability of a PV / T device to provide CHP for a cascaded heat pump assembly. While providing electricity to the R134a compressor 8 and CO2 compressor 9 through photovoltaic power generation, it also generates heat. This heat can affect the efficiency of photovoltaic power generation. Therefore, an external hot water storage tank 3 is connected to the PV / T device. Simultaneously, the hot water storage tank 3 is connected to the finned heat exchanger 7 placed outside the intermediate heat exchanger 10. The heat generated during power generation is collected through the hot water storage tank 3. When the tank temperature exceeds a set value T, the first circulating water pump 2 and the second circulating water pump 5 between the hot water storage tank 3 and the finned heat exchanger 7 start working, transferring the hot water from the hot water storage tank 3 to the finned heat exchanger 7 side to raise the air temperature outside the finned heat exchanger 7. This serves as a preheating effect and further extends the frosting interval on the outside of the finned heat exchanger 7, while also improving the air temperature around the finned heat exchanger 7. Furthermore, the water circulation in the hot water storage tank 3 removes the heat generated by the photovoltaic layer, further improving the efficiency of photovoltaic power generation. Traditional defrosting methods consume some of the heat generated by the heat pump and additional electrical energy. The defrosting method described in this application is self-sufficient in electrical energy consumption and does not consume the heat generated by the heat pump. Simultaneously, the heat generated by the electric heating element can be used to preheat the refrigerant, further increasing the heat contained within it. In the first part, the hot water storage tank also removes the heat generated during photovoltaic power generation, increasing power generation efficiency and preheating the low-temperature refrigerant. This not only improves the heat pump's operating efficiency but also enhances energy utilization, making full use of waste heat. The characteristics of the PV / T defrosting device allow it to be effectively combined with cascade heat pump components, fully utilizing the electricity generated by the photovoltaic system and the heat generated during power generation to provide additional electrical energy to the cascade heat pump components and achieve low-energy defrosting, further improving the efficiency of the cascade heat pump components.

[0020] The working principle of the cascade high-temperature air source heat pump with PV / T defrosting device provided by this utility model is as follows: the low-temperature R134a refrigerant passes through the finned heat exchanger 7 and absorbs the heat from the air brought by the fan 4 and the heat storage tank 3 to become a low-temperature, low-pressure refrigerant gas. It then enters the R134a compressor 8 and is compressed into a high-temperature, high-pressure refrigerant gas. It exchanges heat with the high-temperature CO2 refrigerant through the intermediate heat exchanger 10, further increasing the heat absorbed by the high-temperature stage in the intermediate heat exchanger 10. After the heat exchange is completed, the high-temperature, high-pressure gas becomes a medium-temperature, medium-pressure gas, which is then converted back into a low-temperature, low-pressure liquid refrigerant through the first expansion valve 11. The high-temperature stage works similarly to the low-temperature stage. Its working principle is that the CO2 refrigerant first passes through the intermediate heat exchanger 10 to become a low-temperature, low-pressure refrigerant gas, and then is compressed by the CO2 compressor 9 to become a high-temperature, high-pressure gas. Finally, it passes through the gas cooler 16 to achieve heat exchange with the target working fluid, and then passes through the second expansion valve 12 for throttling, cooling and depressurization. Finally, the gas cooler 16 is used to generate the high-temperature hot water or high-temperature steam required by the user and store it in the water tank 15.

[0021] The defrosting mechanism works as follows: In environments with relative humidity below 60%, the finned heat exchanger 7 will not frost, and the electric heating belt 6 does not need to operate continuously. It only operates when the heat pump frosts in environments with relative humidity above 60%. The PV / T unit 1 generates electricity, which is then supplied to the fan 4. The fan 4 then transfers heat energy from the air to the finned heat exchanger 7 via forced convection. Under normal conditions, the PV / T device 1 generates electrical and thermal energy using photovoltaic and photothermal capabilities. The generated heat is carried away by the first circulating water pump 2 and the heat storage pipe 18 and stored in the hot water storage tank 3. Then, the heat energy is transferred to the side of the finned heat exchanger 7 by the second circulating water pump 5 and the heating pipe 19. The heat in the heating pipe 19 is transferred to the outer wall of the finned heat exchanger 7 by the fan 4 for defrosting. While carrying away heat, the temperature of the photovoltaic power generation layer of the PV / T device 1 is reduced, improving the power generation efficiency. The electrical energy is transmitted to the battery 13 for storage through wires. The battery 13 transmits the electrical energy to the inverter 14 through wires. The inverter 14 converts it into alternating current and directly uses it for the fan 4, electric heating belt 6, R134a compressor 8 and CO2 compressor 9 in the heat pump system. The fan 4 blows the heat from the air and hot water into the finned heat exchanger 7 to allow the refrigerant in the heat exchanger to evaporate. The electric heating belt 6 uses electric energy to heat and defrost the outer wall of the finned heat exchanger 7.

[0022] Example 1 The cascade high-temperature air source heat pump with PV / T defrosting device proposed in this embodiment, such as Figure 1 As shown, it includes a PV / T defrosting device, which is connected to a cascade heat pump assembly via wires.

[0023] Example 2 The cascade high-temperature air source heat pump with PV / T defrosting device proposed in this embodiment, such as Figure 1 As shown, the system includes a PV / T defrosting device, which is connected to a cascade heat pump assembly via wires. The PV / T defrosting device comprises a PV / T electrical defrosting unit and a PV / T thermal defrosting unit. The PV / T electrical defrosting unit is connected to the cascade heat pump assembly via wires, and the PV / T thermal defrosting unit cooperates with the cascade heat pump assembly. The PV / T electrical defrosting unit includes a PV / T device 1, which is connected to a battery 13 via wires. The battery 13 is connected to an inverter 14 via wires, and the inverter 14 is connected to an electric heating belt 6 via wires. The electric heating belt 6 is located at... The PV / T heat energy defrosting unit on the cascade heat pump assembly includes a heat storage pipe 18, which passes through the PV / T device 1. The heat storage pipe 18 is connected to a hot water storage tank 3 at both ends. A first circulating water pump 2 is installed on the heat storage pipe 18. The unit also includes a heating pipe 19, which is connected to the hot water storage tank 3 at both ends. A second circulating water pump 5 is installed on the heating pipe 19. The heating pipe 19 is located on one side of the cascade heat pump assembly. The unit also includes a fan 4. An inverter 14 is connected to the fan 4 via a wire. The fan 4 is located on the other side of the heating pipe 19. The fan 4 works in conjunction with the cascade heat pump assembly.

[0024] Example 3 The cascade high-temperature air source heat pump with PV / T defrosting device proposed in this embodiment, such as Figure 1 As shown, the system includes a PV / T defrosting device, which is connected to a cascade heat pump assembly via wires. The PV / T defrosting device comprises a PV / T electric defrosting unit and a PV / T thermal defrosting unit. The PV / T electric defrosting unit is connected to the cascade heat pump assembly via wires, and the PV / T thermal defrosting unit works in conjunction with the cascade heat pump assembly. The PV / T electric defrosting unit includes a PV / T device 1, which is connected to a battery 13 via wires. The battery 13 is connected to an inverter 14 via wires, and the inverter 14 is connected to an electric heating element 6 via wires. The electric heating element 6 is mounted on the cascade heat pump assembly. The PV / T thermal defrosting unit includes a heat storage pipe 18. Pipeline 18 passes through PV / T unit 1. The heat storage pipeline 18 is connected to a hot water storage tank 3 at both ends. A first circulating water pump 2 is installed on the heat storage pipeline 18. It also includes a heating pipeline 19, with both ends of the heating pipeline 19 connected to the hot water storage tank 3. A second circulating water pump 5 is installed on the heating pipeline 19. The heating pipeline 19 is located on one side of the cascade heat pump assembly. It also includes a fan 4. An inverter 14 is connected to the fan 4 via a wire. The fan 4 is located on the other side of the heating pipeline 19. The fan 4 works in conjunction with the cascade heat pump assembly. The cascade heat pump assembly includes an R134a heat exchange unit, a CO2 heat exchange unit, and an energy storage unit. The R134a heat exchange unit, the CO2 heat exchange unit, and the energy storage unit are connected in sequence.

[0025] Example 4 The cascade high-temperature air source heat pump with PV / T defrosting device proposed in this embodiment, such as Figure 1 As shown, the system includes a PV / T defrosting device, which is connected to a cascade heat pump assembly via wires. The PV / T defrosting device comprises a PV / T electrical defrosting unit and a PV / T thermal defrosting unit. The PV / T electrical defrosting unit is connected to the cascade heat pump assembly via wires, and the PV / T thermal defrosting unit cooperates with the cascade heat pump assembly. The PV / T electrical defrosting unit includes a PV / T device 1, which is connected to a battery 13 via wires. The battery 13 is connected to a reverse... The inverter 14 is connected to an electric heating belt 6 via wires. The electric heating belt 6 is mounted on the cascade heat pump assembly. The PV / T thermal defrosting unit includes a heat storage pipe 18, which passes through the PV / T device 1. The heat storage pipe 18 is connected to a hot water storage tank 3 at both ends. A first circulating water pump 2 is installed on the heat storage pipe 18. The unit also includes a heating pipe 19, which is connected to the hot water storage tank 3 at both ends. A second circulating water pump 5 is installed on the heating pipe 19. The heating pipe 19 is mounted on the cascade heat pump assembly. On one side of the cascade heat pump assembly, there is also a fan 4. The inverter 14 is connected to the fan 4 via a wire. The fan 4 is located on the other side of the heating pipe 19. The fan 4 cooperates with the cascade heat pump assembly. The cascade heat pump assembly includes an R134a heat exchange unit, a CO2 heat exchange unit, and an energy storage unit, which are connected in sequence. The R134a heat exchange unit includes an R134a pipe 20, with finned heat exchangers 7 connected to both ends of the R134a pipe 20. Tropical 6 is bonded to finned heat exchanger 7 via thermally conductive gel. R134a compressor 8 and first expansion valve 11 are installed on R134a pipe 20. Inverter 14 is connected to R134a compressor 8 via wire. Intermediate heat exchanger 10 is also installed between R134a compressor 8 and first expansion valve 11 on R134a pipe 20. CO2 heat exchange unit passes through intermediate heat exchanger 10 and cooperates with intermediate heat exchanger 10. Temperature and humidity sensor 17 is installed on finned heat exchanger 7.

[0026] Example 5 The cascade high-temperature air source heat pump with PV / T defrosting device proposed in this embodiment, such as Figure 1As shown, the system includes a PV / T defrosting device, which is connected to a cascade heat pump assembly via wires. The PV / T defrosting device comprises a PV / T electrical defrosting unit and a PV / T thermal defrosting unit. The PV / T electrical defrosting unit is connected to the cascade heat pump assembly via wires, and the PV / T thermal defrosting unit cooperates with the cascade heat pump assembly. The PV / T electrical defrosting unit includes a PV / T device 1, which is connected to a battery 13 via wires. The battery 13 is connected to an inverter 14 via wires, and the inverter 14 is connected to an electric heating belt 6 via wires. The electric heating belt 6 is mounted on the cascade heat pump assembly. The PV / T thermal defrosting unit includes a heat storage pipe 18, which passes through the PV / T unit 1. The heat storage pipe 18 is connected at both ends to a hot water storage tank 3. A first circulating water pump 2 is installed on the heat storage pipe 18. It also includes a heating pipe 19, whose ends are connected to the hot water storage tank 3. A second circulating water pump 5 is installed on the heating pipe 19, which is located on one side of the cascade heat pump assembly. The unit also includes a fan 4, with an inverter 14 connected to the fan 4 via wires. The fan 4 is located on the other side of the heating pipe 19 and works in conjunction with the cascade heat pump assembly. The cascade heat pump assembly includes an R134a heat exchange unit and a CO2... The heat exchange unit and energy storage unit are sequentially connected, with the R134a heat exchange unit, CO2 heat exchange unit, and energy storage unit all in sequence. The R134a heat exchange unit includes an R134a pipe 20, with finned heat exchangers 7 connected to both ends of the pipe. An electric heating strip 6 is bonded to the finned heat exchanger 7 via thermally conductive gel. An R134a compressor 8 and a first expansion valve 11 are installed on the R134a pipe 20. An inverter 14 is connected to the R134a compressor 8 via wires. An intermediate heat exchanger 10 is also installed on the R134a pipe 20 between the R134a compressor 8 and the first expansion valve 11. The CO2 heat exchange unit passes through the intermediate heat exchanger 10. Intermediate heat exchanger 10, CO2 heat exchange unit cooperates with intermediate heat exchanger 10; temperature and humidity sensor 17 is installed on finned heat exchanger 7; CO2 heat exchange unit includes CO2 pipe 21, CO2 pipe 21 is connected end to end to form a loop, CO2 pipe 21 passes through intermediate heat exchanger 10, CO2 compressor 9 and second expansion valve 12 are installed on CO2 pipe 21, inverter 14 is connected to CO2 compressor 9 through wire, gas cooler 16 is also installed between CO2 compressor 9 and second expansion valve 12 on CO2 pipe 21, energy storage unit passes through gas cooler 16, energy storage unit cooperates with gas cooler 16.

[0027] Example 6 The cascade high-temperature air source heat pump with PV / T defrosting device proposed in this embodiment, such as Figure 1As shown, the system includes a PV / T defrosting device, which is connected to a cascade heat pump assembly via wires. The PV / T defrosting device comprises a PV / T electrical defrosting unit and a PV / T thermal defrosting unit. The PV / T electrical defrosting unit is connected to the cascade heat pump assembly via wires, and the PV / T thermal defrosting unit works in conjunction with the cascade heat pump assembly. The PV / T electrical defrosting unit includes a PV / T device 1, which is connected to a battery 13 via wires. The battery 13 is connected to an inverter 14 via wires, and the inverter 14 is connected to an electric heating belt 6 via wires. The electric heating belt 6 is mounted on the cascade heat pump assembly. The PV / T thermal defrosting unit includes a heat storage unit. Pipe 18, a heat storage pipe 18, passes through the PV / T unit 1. The heat storage pipe 18 is connected at both ends to a hot water storage tank 3. A first circulating water pump 2 is installed on the heat storage pipe 18. It also includes a heating pipe 19, whose ends are connected to the hot water storage tank 3. A second circulating water pump 5 is installed on the heating pipe 19, which is located on one side of the cascade heat pump assembly. It also includes a fan 4, and an inverter 14 is connected to the fan 4 via wires. The fan 4 is located on the other side of the heating pipe 19 and works in conjunction with the cascade heat pump assembly. The cascade heat pump assembly includes an R134a heat exchange unit, a CO2 heat exchange unit, and an energy storage unit. The R134a heat exchange unit, CO2... The heat exchange unit and the energy storage unit are connected in sequence. The R134a heat exchange unit includes an R134a pipe 20, with finned heat exchangers 7 connected to both ends of the R134a pipe 20. An electric heating belt 6 is bonded to the finned heat exchanger 7 via thermally conductive gel. An R134a compressor 8 and a first expansion valve 11 are installed on the R134a pipe 20. An inverter 14 is connected to the R134a compressor 8 via wires. An intermediate heat exchanger 10 is also installed on the R134a pipe 20 between the R134a compressor 8 and the first expansion valve 11. A CO2 heat exchange unit passes through the intermediate heat exchanger 10 and is connected to it. The finned heat exchanger 7 is equipped with... A temperature and humidity sensor 17 is included; the CO2 heat exchange unit includes a CO2 pipe 21, which is connected end to end to form a loop. The CO2 pipe 21 passes through an intermediate heat exchanger 10. A CO2 compressor 9 and a second expansion valve 12 are installed on the CO2 pipe 21. An inverter 14 is connected to the CO2 compressor 9 through a wire. A gas cooler 16 is also installed between the CO2 compressor 9 and the second expansion valve 12 on the CO2 pipe 21. An energy storage unit passes through the gas cooler 16 and cooperates with the gas cooler 16. The energy storage unit includes an energy storage pipe 22, which passes through the gas cooler 16. A water tank 15 is connected to both ends of the energy storage pipe 22.

Claims

1. Cascade high temperature air source heat pump with PV / T defrosting device, characterized in that, Includes a PV / T defrosting device, which is connected to a cascade heat pump assembly via wires; The PV / T defrosting device includes a PV / T electric defrosting unit and a PV / T thermal defrosting unit. The PV / T electric defrosting unit is connected to the cascade heat pump assembly via wires, and the PV / T thermal defrosting unit cooperates with the cascade heat pump assembly. The PV / T electric defrosting unit includes a PV / T device (1), which is connected to a battery (13) via a wire. The battery (13) is connected to an inverter (14) via a wire. The inverter (14) is connected to an electric heating belt (6) via a wire. The electric heating belt (6) is located on the cascade heat pump assembly. The PV / T thermal defrosting unit includes a heat storage pipe (18), which passes through the PV / T device (1). The heat storage pipe (18) is connected to a hot water storage tank (3) at both ends. A first circulating water pump (2) is installed on the heat storage pipe (18). The unit also includes a heating pipe (19), which is connected to the hot water storage tank (3) at both ends. A second circulating water pump (5) is installed on the heating pipe (19). The heating pipe (19) is located on one side of the cascade heat pump assembly. The unit also includes a fan (4), which is connected to the fan (4) via a wire. The fan (4) is located on the other side of the heating pipe (19). The fan (4) works in conjunction with the cascade heat pump assembly. The cascade heat pump assembly includes an R134a heat exchange unit, a CO2 heat exchange unit, and an energy storage unit, which are connected in sequence. The R134a heat exchange unit includes an R134a pipe (20), with finned heat exchangers (7) connected to both ends of the R134a pipe (20). The electric heating belt (6) is attached to the finned heat exchanger (7) through thermally conductive gel. An R134a compressor (8) and a first expansion valve (11) are installed on the R134a pipe (20). The inverter (14) is connected to the R134a compressor (8) through a wire. An intermediate heat exchanger (10) is also installed between the R134a compressor (8) and the first expansion valve (11) on the R134a pipe (20). The CO2 heat exchange unit passes through the intermediate heat exchanger (10) and cooperates with the intermediate heat exchanger (10). A temperature and humidity sensor (17) is installed on the finned heat exchanger (7). The CO2 heat exchange unit includes a CO2 pipe (21), which is connected end to end to form a loop. The CO2 pipe (21) passes through the intermediate heat exchanger (10). A CO2 compressor (9) and a second expansion valve (12) are installed on the CO2 pipe (21). The inverter (14) is connected to the CO2 compressor (9) through a wire. A gas cooler (16) is also installed between the CO2 compressor (9) and the second expansion valve (12) on the CO2 pipe (21). The energy storage unit passes through the gas cooler (16) and cooperates with the gas cooler (16). The energy storage unit includes an energy storage pipe (22), which passes through the gas cooler (16), and the energy storage pipe (22) is connected to a water tank (15) at both ends.

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