PV / T heat pump coupled air source heat pump sustainable heat supply and defrosting method and system
By coupling a PV/T heat pump with an air source heat pump, and combining photovoltaic power generation and inverter power storage, the problem of indoor heating temperature drop when the air source heat pump frosts is solved, achieving efficient and sustainable heating and defrosting effects, and improving the overall energy efficiency and economy of the system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-31
- Publication Date
- 2026-04-10
AI Technical Summary
Existing air source heat pumps require indoor heating to be stopped when frosting occurs, resulting in a drop in indoor heating temperature. Furthermore, traditional heating systems are unstable, have high investment costs, cause serious environmental pollution, and have low heating efficiency.
By employing a PV/T heat pump coupled with an air source heat pump, appropriate heating and defrosting modes are selected based on the assessment of light and ambient temperature conditions. By combining solar PV/T modules with an air source heat pump, sustainable heating during the defrosting process is achieved, expanding the heat pump's wide temperature operating range. Furthermore, the system operation is optimized through photovoltaic power generation and inverter-stored electricity.
It enables sustainable heating during the defrosting process of air source heat pumps, improves the unit's heating and defrosting efficiency, reduces the demand for grid electricity, lowers operating costs, and expands the high-efficiency operating range of heat pumps.
Smart Images
Figure CN121828944A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of heating systems, and particularly relates to a sustainable heating and defrosting method and system for a PV / T heat pump coupled with an air source heat pump. Background Technique
[0002] Due to different heating characteristics, single-source heating systems have problems such as unstable operation and high investment costs. For example, solar energy resources are unstable and the heating efficiency is relatively low; in northern regions, winters are cold and long. If traditional energy sources are used for heating for a long time, the energy consumption is huge and environmental pollution problems will also be caused; frosting of air source heat pumps is inevitable. During the defrosting operation, the indoor heating of the air source heat pump stops or even absorbs some indoor heat, causing the indoor heating temperature to drop, and it is difficult to ensure the heating effect at low temperatures and during frosting. Summary of the Invention
[0003] Aiming at the above technical problems that frosting of the existing air source heat pump is inevitable and the indoor heating of the air source heat pump needs to stop or even absorb some indoor heat during the defrosting operation, resulting in a decrease in the indoor heating temperature, the present invention proposes a sustainable heating and defrosting method and system for a PV / T heat pump coupled with an air source heat pump, realizing sustainable heating during the defrosting process of the air source heat pump, broadening the wide-temperature operation range of the air source heat pump and the PV / T heat pump, enabling the heat pump unit to maintain efficient operation, and improving the coefficient of performance of the unit in the heating season.
[0004] To achieve the above object, the technical solution adopted by the present invention is: a sustainable heating and defrosting method for a PV / T heat pump coupled with an air source heat pump, including: judging the illumination condition and the environmental temperature condition, and selecting a corresponding heating and defrosting mode based on the illumination condition and the environmental temperature condition, and the heating and defrosting mode includes an air source compensated PV / T heat pump synchronous heating and defrosting mode and a PV / T compensated air source heat pump synchronous heating and defrosting mode.
[0005] In one embodiment, when the illumination is sufficient and the environmental temperature t satisfies t > 0°C or 0°C < t < -4°C, the air source compensated PV / T heat pump synchronous heating and defrosting mode is adopted, including: The high-temperature and high-pressure refrigerant vapor is discharged from a compressor, enters a condenser to heat the heating return water to the supply water temperature, is cooled into a high-temperature and high-pressure liquid refrigerant, then passes through a throttle valve to become a low-temperature and low-pressure two-phase refrigerant, and then enters a solar PV / T module array, and after absorbing the heat generated by solar photovoltaic power generation and the heat of the outdoor environment, it becomes a low-temperature and low-pressure refrigerant vapor and then returns to the compressor to complete compression, forming a cycle.
[0006] In one embodiment, the air source compensated PV / T heat pump synchronous heating and defrosting mode further includes: When frost forms during PV / T heat pump operation, high-temperature, high-pressure refrigerant vapor is discharged from the compressor, enters the solar PV / T module array for defrosting, then enters the condenser to heat the return water to the supply water temperature, and is cooled into high-temperature, high-pressure liquid refrigerant. It then passes through the expansion valve to become low-temperature, low-pressure two-phase refrigerant, and enters an outdoor heat exchanger. By absorbing heat from the outdoor environment, it becomes low-temperature, low-pressure refrigerant vapor and returns to the compressor to complete compression, forming a cycle.
[0007] In one embodiment, when there is insufficient light and the ambient temperature t satisfies t>0℃ or -10℃≤t≤0℃, the PV / T compensated air source heat pump synchronous heating and defrosting mode is adopted, including: High-temperature and high-pressure refrigerant vapor is discharged from a compressor, enters a condenser to heat the heating return water to the supply water temperature, and is then cooled into high-temperature and high-pressure liquid refrigerant. It then passes through a throttling valve to become a low-temperature and low-pressure two-phase refrigerant, and then enters an outdoor heat exchanger. By absorbing heat from the outdoor environment, it becomes low-temperature and low-pressure refrigerant vapor and returns to the compressor to complete the compression, thus forming a cycle.
[0008] In one embodiment, the PV / T compensated air source heat pump synchronous heating and defrosting mode further includes: When the air source heat pump is operating and frost forms, the high-temperature, high-pressure refrigerant vapor is discharged from the compressor and enters the outdoor heat exchanger for defrosting. It then enters the condenser to heat the heating return water to the supply water temperature, where it is cooled into a high-temperature, high-pressure liquid refrigerant. This liquid refrigerant then passes through the expansion valve to become a low-temperature, low-pressure two-phase refrigerant. It then enters the solar PV / T module array, where it absorbs heat generated by solar photovoltaic power generation and heat from the outdoor environment. After becoming low-temperature, low-pressure refrigerant vapor, it returns to the compressor to complete the compression, thus forming a cycle.
[0009] In one embodiment, when the ambient temperature t satisfies t < -10℃, the PV / T compensated air source heat pump synchronous heating and defrosting mode is adopted, including: High-temperature and high-pressure refrigerant vapor is discharged from a compressor, enters a condenser to heat the heating return water to the supply water temperature, and is then cooled into high-temperature and high-pressure liquid refrigerant. It then passes through a throttling valve to become a low-temperature and low-pressure two-phase refrigerant, and then enters an outdoor heat exchanger. By absorbing heat from the outdoor environment, it becomes low-temperature and low-pressure refrigerant vapor and returns to the compressor to complete the compression, thus forming a cycle.
[0010] In one embodiment, the PV / T compensated air source heat pump synchronous heating and defrosting mode further includes: When the air source heat pump is operating and frost forms, the high-temperature, high-pressure refrigerant vapor is discharged from the compressor and enters the outdoor heat exchanger for defrosting. It then enters the condenser to heat the heating return water to the supply water temperature, where it is cooled into a high-temperature, high-pressure liquid refrigerant. This liquid refrigerant then passes through the expansion valve to become a low-temperature, low-pressure two-phase refrigerant. It then enters the solar PV / T module array, where it absorbs heat generated by solar photovoltaic power generation and heat from the outdoor environment. After becoming low-temperature, low-pressure refrigerant vapor, it returns to the compressor to complete the compression, thus forming a cycle.
[0011] In one embodiment, the method further includes controlling the use of electricity, the control of the use of electricity including: When there is sufficient sunlight, the PV / T panels in the solar PV / T module array generate electricity. Part of the electricity is used for the operation of the PV / T heat pump coupled air source heat pump sustainable heating and defrosting system, and the other part of the electricity is stored in the battery for backup through the inverter. When there is insufficient sunlight, the PV / T heat pump coupled to the air source heat pump will use the power in the battery first when the continuous heating and defrosting system is running. When the power is insufficient, the grid power will be used.
[0012] In one embodiment, the control of electricity consumption further includes: During off-peak hours, the inverter stores the electricity supplied by the grid in the battery. During peak power periods, the PV / T heat pump coupled with the air source heat pump continuously provides heating and defrosting system, which prioritizes the use of the battery's power. When the battery's power is insufficient, it will then be supplied by the power grid.
[0013] In another aspect, the present invention provides a PV / T heat pump coupled with an air source heat pump for sustainable heating and defrosting, applied to the aforementioned PV / T heat pump coupled with an air source heat pump for sustainable heating and defrosting. The PV / T heat pump coupled with an air source heat pump for sustainable heating and defrosting includes: a compressor, a condenser, a throttling valve, an outdoor heat exchanger, a solar PV / T module array, and multiple valves. The first inlet of the compressor is connected to the first outlet of the solar PV / T module array through a first valve; the second inlet of the compressor is connected to the first outlet of the outdoor heat exchanger through a fifth valve; the first outlet of the compressor is connected to the first inlet of the condenser; the second outlet of the compressor is connected to the second inlet of the outdoor heat exchanger through a fourth valve; and the third outlet of the compressor is connected to the inlet of the solar PV / T module array through a seventh valve. The second inlet of the condenser is connected to the second outlet of the outdoor heat exchanger via a third valve, the third inlet of the condenser is connected to the second outlet of the solar PV / T module array via an eighth valve, and the outlet of the condenser is connected to the inlet of the throttling valve. The first outlet of the throttling valve is connected to the inlet of the solar PV / T module array via a second valve, and the second outlet of the throttling valve is connected to the first inlet of the outdoor heat exchanger via a sixth valve.
[0014] Compared with the prior art, the advantages and positive effects of the present invention are as follows: This invention presents a sustainable heating and defrosting method for PV / T heat pump coupled with an air-source heat pump. It broadens the operating range of both the air-source heat pump and the PV / T heat pump across a wider temperature range, enabling the heat pump unit to operate efficiently most of the time and improving its energy efficiency coefficient during the heating season. Utilizing the fins of the air-source heat pump and the solar PV / T module array as the outdoor heat exchanger allows for flexible switching, increases the evaporation area of the heat pump, and improves the energy efficiency ratio compared to traditional air source heat pumps. It can simultaneously achieve heating and defrosting, with no heat loss during defrosting, eliminating the need for additional power equipment and improving both the heating and defrosting efficiency of the air-source heat pump. When there is sufficient sunlight, it operates in PVT heating mode, where the heat dissipation of the photovoltaic panels under sunlight significantly increases the temperature of the outdoor heat exchanger, reducing the workload of the defrosting system. As a burden, the solar PV / T module array can defrost the outdoor heat exchanger of the air source heat pump while heating, improving the defrosting efficiency compared to conventional air source heat pump systems and effectively preventing frost buildup on the outdoor heat exchanger. The electricity generated by the solar PV / T module array is supplied to the air source heat pump through an inverter. When the power is insufficient, it is supplemented by the grid power, and when the power is sufficient, the electricity is fed into the grid, reducing the demand for grid power. According to peak and off-peak electricity pricing, the grid power can be stored in the battery during off-peak hours and supplied to the system during peak hours, saving system operating costs. When the heat pump is running, the refrigerant flowing in the solar PV / T module array can also remove heat from the panels, playing a role in cooling down. Compared with traditional single photovoltaic modules, this reduces the operating temperature and improves electrical efficiency. Attached Figure Description
[0015] Figure 1 This is a schematic diagram illustrating the working principle of the PV / T heat pump coupled air source heat pump continuous heating defrosting method of the present invention; 1. Compressor; 2. Condenser; 3. Throttling valve; 4. Outdoor heat exchanger; 5. Solar PV / T module array; 6. First valve; 7. Second valve; 8. Third valve; 9. Fourth valve; 10. Fifth valve; 11. Sixth valve; 12. Seventh valve; 13. Eighth valve. Detailed Implementation
[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0017] This invention provides a method and system for sustainable heating and defrosting using a PV / T heat pump coupled with an air source heat pump. The method includes: determining the light and ambient temperature conditions, and selecting a corresponding heating and defrosting mode based on these conditions. The heating and defrosting modes include an air source compensated PV / T heat pump synchronous heating and defrosting mode and an air source heat pump heating and defrosting mode. This invention optimizes the thermodynamic cycle by coupling a solar photovoltaic / thermal (PV / T) module with an air source heat pump, achieving sustainable heating during the air source heat pump defrosting process. It also improves the power generation efficiency of the PV / T panel and the heating performance of the air source heat pump, enabling solar energy and air energy to complement each other, achieving combined heat and power (CHP) and improving the overall energy efficiency of the system. The solar PV / T module array 5 generates electricity while also serving as an outdoor heat exchanger for the air source heat pump, coupling with both the air source and water source heat pumps to achieve CHP. The generated electricity is fed into a battery to provide power to the integrated energy system. The hot water storage tank is used to store excess heat generated by the air source heat pump, while the water source heat pump is used to heat the generated low-temperature hot water to meet the user's demand for high-temperature hot water.
[0018] Figure 1 This is a schematic diagram illustrating the working principle of the PV / T heat pump coupled with an air source heat pump for sustainable heating and defrosting according to the present invention. (Refer to...) Figure 1As shown in the figure, the sustainable heating and defrosting method of the PV / T heat pump coupled with an air source heat pump provided by the embodiment of the present invention adopts the PV / T heat pump heating and defrosting mode when the light is sufficient and the ambient temperature t satisfies t > 0°C or 0°C < t < -4°C, including: opening the first valve 6 and the second valve 7, and closing the third valve 8, the fourth valve 9, the fifth valve 10, the sixth valve 11, the seventh valve 12 and the eighth valve 13 at the same time. The high-temperature and high-pressure refrigerant vapor is discharged from the compressor 1, enters the condenser 2 to heat the heating return water to the supply temperature, and then is cooled into a high-temperature and high-pressure liquid refrigerant. After passing through the throttle valve 3, it becomes a low-temperature and low-pressure two-phase refrigerant, and then enters the solar PV / T module array 5 through the second valve 7. After absorbing heat and becoming a low-temperature and low-pressure refrigerant vapor, it returns to the compressor 1 through the first valve 6 to complete compression, forming a cycle; among which, a part of the absorbed heat comes from the heat generated by solar photovoltaic power generation, which can reduce the temperature of the PV / T panel and improve the power generation efficiency, and the other part comes from the outdoor air environment. The supply temperature generally refers to the heating temperature of 45°C - 50°C, or the domestic hot water temperature of 50°C - 55°C. The present invention operates in the PVT heating mode during the daytime with sufficient light. The heat dissipation of the photovoltaic cell under light can greatly increase the temperature of the outdoor heat exchanger 4, and the solar photovoltaic-thermal module can also defrost the fins while heating. Compared with the conventional air source heat pump system, it can effectively prevent the outdoor heat exchanger 4 from frosting.
[0019] In one embodiment of the present invention, when frosting occurs during the operation of the PV / T heat pump, the fifth valve 10, the sixth valve 11, the seventh valve 12 and the eighth valve 13 are opened, and the first valve 6, the second valve 7, the third valve 8 and the fourth valve 9 are closed at the same time. The air source heat pump synchronous heating and defrosting mode is started. The high-temperature and high-pressure refrigerant vapor is discharged from the compressor 1, enters the solar PV / T module array 5 through the seventh valve 12 for heating and defrosting, and then enters the condenser 2 through the eighth valve 13 to heat the heating return water to the supply temperature, and then is cooled into a high-temperature and high-pressure liquid refrigerant. After passing through the throttle valve 3, it becomes a low-temperature and low-pressure two-phase refrigerant, enters the outdoor heat exchanger 4 through the sixth valve 11, absorbs the heat of the outdoor air, becomes a low-temperature and low-pressure refrigerant vapor, and then returns to the compressor 1 through the fifth valve 10 to complete compression, forming a cycle. This heating and defrosting mode achieves the purpose of uninterrupted indoor heating while defrosting the PV / T heat pump, and improves the heating energy efficiency ratio (COP) during the defrosting period of the system.
[0020] In one embodiment of the present invention, when there is insufficient light and the ambient temperature t satisfies t>0℃ or -10℃≤t≤0℃, a PV / T compensated air source heat pump synchronous heating and defrosting mode is adopted, including: opening the fifth valve 10 and the sixth valve 11, while closing the first valve 6, the second valve 7, the third valve 8, the fourth valve 9, the seventh valve 12 and the eighth valve 13. The high-temperature and high-pressure refrigerant vapor is discharged from the compressor 1, enters the condenser 2 to heat the heating return water to the supply water temperature, and is cooled into a high-temperature and high-pressure liquid refrigerant. It then passes through the throttling valve 3 to become a low-temperature and low-pressure two-phase refrigerant, and then enters the outdoor heat exchanger 4 through the sixth valve 11. After absorbing the heat of the outdoor air, it becomes a low-temperature and low-pressure refrigerant vapor, and then returns to the compressor 1 through the fifth valve 10 to complete the compression, forming a cycle.
[0021] In one embodiment of the present invention, when the ambient temperature t satisfies t<-10℃, a PV / T compensated air source heat pump synchronous heating and defrosting mode is adopted, including: opening the fifth valve 10 and the sixth valve 11, while closing the first valve 6, the second valve 7, the third valve 8, the fourth valve 9, the seventh valve 12 and the eighth valve 13. The high-temperature and high-pressure refrigerant vapor is discharged from the compressor 1, enters the condenser 2 to heat the heating return water to the supply water temperature, and is cooled into a high-temperature and high-pressure liquid refrigerant. It then passes through the throttling valve 3 to become a low-temperature and low-pressure two-phase refrigerant, and then enters the outdoor heat exchanger 4 through the sixth valve 11. After absorbing the heat of the outdoor air, it becomes a low-temperature and low-pressure refrigerant vapor, and then returns to the compressor 1 through the fifth valve 10 to complete the compression, forming a cycle.
[0022] In one embodiment of the present invention, when the air source heat pump experiences frost formation, the first valve 6, the second valve 7, the third valve 8, and the fourth valve 9 are opened, while the fifth valve 10, the sixth valve 11, the seventh valve 12, and the eighth valve 13 are closed. This activates the PV / T heat pump's synchronous heating and defrosting mode. High-temperature, high-pressure refrigerant vapor is discharged from the compressor 1 and enters the outdoor heat exchanger heating coils and fins of the air source heat pump via the fourth valve 9 for defrosting. Then, it enters the condenser 2 via the third valve 8 to heat the heating return water to the supply water temperature, where it is cooled into high-temperature, high-pressure liquid refrigerant. This liquid refrigerant then passes through the throttling valve 3 to become a low-temperature, low-pressure two-phase refrigerant. It then enters the solar PV / T module array 5 via the second valve 7, absorbing heat generated by solar photovoltaic power generation and some of the outdoor ambient air heat. After becoming low-temperature, low-pressure refrigerant vapor, it returns to the compressor 1 via the first valve 6 to complete compression, forming a cycle. This heating and defrosting mode achieves the goal of continuous indoor heating while defrosting, improving the defrosting efficiency of the air source heat pump and enhancing the heating COP during defrosting.
[0023] The PV / T heat pump coupled air source heat pump sustainable heating defrosting method provided in this embodiment of the invention further includes control of electricity consumption, wherein the control of electricity consumption includes: When there is sufficient sunlight, the PV / T panels in the solar PV / T module array 5 generate electricity. Part of the electricity is used for the operation of the PV / T heat pump coupled air source heat pump sustainable heating and defrosting system, and the other part of the electricity is stored in the battery for backup through the inverter. When there is insufficient sunlight, the PV / T heat pump coupled with the air source heat pump will use the power in the battery first when the battery is insufficient, and then use the grid power supply when the power is insufficient. During off-peak hours, the inverter stores the electricity supplied by the grid in the battery. During peak electricity hours, the PV / T heat pump coupled with the air source heat pump will prioritize the use of the battery power during the operation of the continuous heating and defrosting system. When the battery power is insufficient, the grid power will be used.
[0024] Using the above method, the electricity generated by the solar PV / T module array 5 is supplied to the air source heat pump through the inverter. When the power is insufficient, it is supplemented by the grid power, and when the power is sufficient, the power is fed into the grid, reducing the demand for grid power. According to the peak and off-peak electricity price, the grid power can be stored in the battery during off-peak hours and supplied to the system during peak hours, saving the system's operating costs and improving the system's economic efficiency.
[0025] In another aspect, this invention provides a PV / T heat pump coupled with an air source heat pump for sustainable heating and defrosting, applicable to the aforementioned PV / T heat pump coupled with an air source heat pump for sustainable heating and defrosting. This invention's PV / T heat pump coupled with an air source heat pump for sustainable heating and defrosting system broadens the operating range of both the air source heat pump and the PV / T heat pump, enabling the heat pump unit to maintain high efficiency most of the time and improving the unit's coefficient of performance (COP) during the heating season. (See attached document.) Figure 1As shown, the system includes a compressor 1, a condenser 2, a throttling valve 3, an outdoor heat exchanger 4, a solar PV / T module array 5, and multiple valves. The first inlet of the compressor 1 is connected to the first outlet of the solar PV / T module array 5 through the first valve 6. The second inlet of the compressor 1 is connected to the first outlet of the outdoor heat exchanger 4 through the fifth valve 10. The first outlet of the compressor 1 is connected to the first inlet of the condenser 2. The second outlet of the compressor 1 is connected to the second inlet of the outdoor heat exchanger 4 through the fourth valve 9. The third outlet of the compressor 1 is connected to the solar PV / T module array 5 through the seventh valve 12. The second inlet of the condenser 2 is connected to the second outlet of the outdoor heat exchanger 4 through the third valve 8. The third inlet of the condenser 2 is connected to the second outlet of the solar PV / T module array 5 through the eighth valve 13. The outlet of the condenser 2 is connected to the inlet of the throttling valve 3. The first outlet of the throttling valve 3 is connected to the solar PV / T module array 5 through the second valve 7. The second outlet of the throttling valve 3 is connected to the first inlet of the outdoor heat exchanger 4 through the sixth valve 11. The solar PV / T module array 5 includes PV / T panels, an inverter, and a battery. The PV / T panels generate electricity when there is sufficient sunlight, and the electricity generated by the PV / T panels or the electricity supplied by the grid is stored in the battery through the inverter.
[0026] The above-described embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications, alterations, evolutions, or improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope of the present invention.
Claims
1. A method for continuous heating and defrosting using a PV / T heat pump coupled with an air source heat pump, characterized in that, Comprising: Judging the light condition and the ambient temperature condition, and selecting the corresponding heating and defrosting mode based on the light condition and the ambient temperature condition, wherein the heating and defrosting mode includes an air-source compensated PV / T heat pump synchronous heating and defrosting mode and a PV / T compensated air-source heat pump synchronous heating and defrosting mode.
2. The PV / T heat pump coupled with an air source heat pump for sustainable heating and defrosting method according to claim 1, characterized in that, When the light is sufficient and the ambient temperature t satisfies t>0°C or 0°C<t<-4°C, the air-source compensated PV / T heat pump synchronous heating and defrosting mode is adopted, including: The high-temperature and high-pressure refrigerant vapor is discharged from a compressor, enters a condenser to heat the heating return water to the supply water temperature, is cooled into a high-temperature and high-pressure liquid refrigerant, then becomes a low-temperature and low-pressure two-phase refrigerant through a throttle valve, and then enters a solar PV / T module array. By absorbing the heat generated by solar photovoltaic power generation and the heat of the outdoor environment, it becomes a low-temperature and low-pressure refrigerant vapor and then returns to the compressor to complete compression, forming a cycle.
3. The PV / T heat pump coupled with an air source heat pump for sustainable heating and defrosting method according to claim 2, characterized in that, The air-source compensated PV / T heat pump synchronous heating and defrosting mode further includes: When frosting occurs during the operation of the PV / T heat pump, the high-temperature and high-pressure refrigerant vapor is discharged from the compressor, enters the solar PV / T module array for heating defrosting, then enters the condenser to heat the heating return water to the supply water temperature, is cooled into a high-temperature and high-pressure liquid refrigerant, then becomes a low-temperature and low-pressure two-phase refrigerant through the throttle valve, and then enters an outdoor heat exchanger. By absorbing the heat of the outdoor environment, it becomes a low-temperature and low-pressure refrigerant vapor and then returns to the compressor to complete compression, forming a cycle.
4. The PV / T heat pump coupled to air source heat pump continuous heating defrosting method according to claim 1, characterized in that, When the light is insufficient and the ambient temperature t satisfies t>0°C or -10°C≤t≤0°C, the PV / T compensated air-source heat pump synchronous heating and defrosting mode is adopted, including: The high-temperature and high-pressure refrigerant vapor is discharged from a compressor, enters a condenser to heat the heating return water to the supply water temperature, is cooled into a high-temperature and high-pressure liquid refrigerant, then becomes a low-temperature and low-pressure two-phase refrigerant through a throttle valve, and then enters an outdoor heat exchanger. By absorbing the heat of the outdoor environment, it becomes a low-temperature and low-pressure refrigerant vapor and then returns to the compressor to complete compression, forming a cycle.
5. The PV / T heat pump coupled to air source heat pump continuous heating defrosting method according to claim 4, characterized in that, The PV / T compensated air-source heat pump synchronous heating and defrosting mode further includes: When frosting occurs during the operation of the air-source heat pump, the high-temperature and high-pressure refrigerant vapor is discharged from the compressor, enters the outdoor heat exchanger for heating defrosting, then enters the condenser to heat the heating return water to the supply water temperature, is cooled into a high-temperature and high-pressure liquid refrigerant, then becomes a low-temperature and low-pressure two-phase refrigerant through the throttle valve, and then enters the solar PV / T module array. By absorbing the heat generated by solar photovoltaic power generation and the heat of the outdoor environment, it becomes a low-temperature and low-pressure refrigerant vapor and then returns to the compressor to complete compression, forming a cycle.
6. The PV / T heat pump coupled to air source heat pump for sustainable heating and defrosting method according to claim 1, characterized in that, When the ambient temperature t satisfies t<-10°C, the PV / T compensated air-source heat pump synchronous heating and defrosting mode is adopted, including: High-temperature and high-pressure refrigerant vapor is discharged from a compressor, enters a condenser to heat the return water to the supply water temperature, and is then cooled into high-temperature and high-pressure liquid refrigerant. It then passes through a throttling valve to become low-temperature and low-pressure two-phase refrigerant, and then enters an outdoor heat exchanger. By absorbing heat from the outdoor environment, it becomes low-temperature and low-pressure refrigerant vapor and returns to the compressor to complete the compression, thus forming a cycle.
7. The PV / T heat pump coupled to air source heat pump continuous heating defrosting method according to claim 6, characterized in that, The PV / T compensated air source heat pump synchronous heating and defrosting mode also includes: When the air source heat pump is operating and frost forms, the high-temperature, high-pressure refrigerant vapor is discharged from the compressor and enters the outdoor heat exchanger for defrosting. It then enters the condenser to heat the heating return water to the supply water temperature, where it is cooled into a high-temperature, high-pressure liquid refrigerant. This liquid refrigerant then passes through the expansion valve to become a low-temperature, low-pressure two-phase refrigerant. It then enters the solar PV / T module array, where it absorbs heat generated by solar photovoltaic power generation and heat from the outdoor environment. After becoming low-temperature, low-pressure refrigerant vapor, it returns to the compressor to complete the compression, thus forming a cycle.
8. The PV / T heat pump coupled to air source heat pump for sustainable heating and defrosting method according to claim 1, characterized in that, The method also includes controlling the use of electricity, wherein the control of the use of electricity includes: When there is sufficient sunlight, the PV / T panels in the solar PV / T module array generate electricity. Part of the electricity is used for the operation of the PV / T heat pump coupled air source heat pump sustainable heating and defrosting system, and the other part of the electricity is stored in the battery for backup through the inverter. When there is insufficient sunlight, the PV / T heat pump coupled to the air source heat pump will use the power in the battery first when the continuous heating and defrosting system is running. When the power is insufficient, the grid power will be used.
9. The PV / T heat pump coupled to air source heat pump for sustainable heating and defrosting method according to claim 8, characterized in that, The control of electricity consumption also includes: During off-peak hours, the inverter stores the electricity supplied by the grid in the battery. During peak power periods, the PV / T heat pump coupled with the air source heat pump continuously provides heating and defrosting system, which prioritizes the use of the battery's power. When the battery's power is insufficient, it will then be supplied by the power grid.
10. A PV / T heat pump coupled with an air source heat pump for sustainable heating and defrosting, applied to the PV / T heat pump coupled with an air source heat pump for sustainable heating and defrosting method according to any one of claims 1-9, characterized in that, The PV / T heat pump coupled to air source heat pump sustainable heating and defrosting system includes: a compressor, a condenser, a throttling valve, an outdoor heat exchanger, a solar PV / T module array, and multiple valves, among which... The first inlet of the compressor is connected to the first outlet of the solar PV / T module array via a first valve; the second inlet of the compressor is connected to the first outlet of the outdoor heat exchanger via a fifth valve; the first outlet of the compressor is connected to the first inlet of the condenser; the second outlet of the compressor is connected to the second inlet of the outdoor heat exchanger via a fourth valve; and the third outlet of the compressor is connected to the inlet of the solar PV / T module array via a seventh valve. The second inlet of the condenser is connected to the second outlet of the outdoor heat exchanger via a third valve, the third inlet of the condenser is connected to the second outlet of the solar PV / T module array via an eighth valve, and the outlet of the condenser is connected to the inlet of the throttling valve. The first outlet of the throttling valve is connected to the inlet of the solar PV / T module array via a second valve, and the second outlet of the throttling valve is connected to the first inlet of the outdoor heat exchanger via a sixth valve.