Energy-saving method of electricity generation based on light and heat energy

Abstract

The present invention provides an energy-saving method for generating electricity based on light energy and heat energy, which belongs to the field of energy optimization technology, including: when the external ambient temperature is high, the compressor works on the liquid flowing in from the photovoltaic panel to increase its temperature and pressure and form gas, and the low-temperature water supplied by the ground source heat pump and the condenser sequentially cool the gas discharged from the compressor, and after the secondary cooling, the gas is partially liquefied into liquid and flows into the evaporator. When the external ambient temperature is low, the gas discharged from the compressor is passed into the evaporator so that the evaporator dissipates heat into the room, and the liquid in the evaporator after heat dissipation is drained to the photovoltaic panel and the photovoltaic panel is heated a second time with the help of high-temperature water supplied by the ground source heat pump. The energy-saving method for generating electricity based on light energy and heat energy provided by the present invention regulates the indoor temperature while ensuring the power generation efficiency of the photovoltaic panel, ultimately reducing energy consumption, ensuring comfort and reducing operating costs.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy optimization, and more specifically, relates to an energy-saving method for generating electricity based on light energy and heat energy. Background Art

[0002] With the continuous growth of population and economy, humanity's demand for energy is increasing. Exploring clean and renewable energy has become a new trend in global energy development. Improving the efficiency of existing energy and accelerating the development of new energy are the main ways to address the two fundamental issues of energy and the environment in human development. Solar energy, as one of the most abundant clean and renewable energy sources, has attracted widespread attention.

[0003] A geothermal heat pump system is a highly efficient and energy-saving device that utilizes shallow underground geothermal resources (including groundwater, underground rock and soil, or surface water) for both heating and cooling. Solar energy has become a focus of attention due to its unique advantages. The abundant solar radiation energy is an inexhaustible, pollution-free, and safe renewable energy source. Air conditioning systems are required for cooling in the summer, but air conditioning consumes a lot of electricity in the winter. Therefore, in northern China, heating is often done with coal. Furthermore, in some areas of the country, winter temperatures can even drop below zero. Even with high light intensity, the conversion efficiency of photovoltaic panels remains low.

[0004] Based on the above reasons, the existing methods cannot effectively realize the organic combination of light energy, heat energy and electrical energy, cannot effectively reduce energy consumption, and ultimately lead to high operating costs. Summary of the Invention

[0005] The purpose of the present invention is to provide an energy-saving method for generating electricity based on light energy and heat energy, aiming to solve the problem that it is impossible to effectively realize the organic combination of light energy, heat energy and electric energy, and it is impossible to effectively reduce energy consumption, which ultimately leads to high operating costs.

[0006] To achieve the above objectives, the present invention adopts a technical solution of providing an energy-saving method for generating electricity based on light energy and heat energy, comprising:

[0007] When the external ambient temperature is high, the evaporator absorbs the heat in the room through the internal low-temperature liquid, and drains the liquid that has completed the heat exchange to the photovoltaic panel through the liquid inlet pipe to cool the photovoltaic panel;

[0008] The compressor works on the liquid flowing in from the photovoltaic panel to increase its temperature and pressure and form gas. The low-temperature water supplied by the ground-source heat pump and the condenser sequentially cool the gas discharged from the compressor. After the secondary cooling, the gas is partially liquefied into liquid and flows into the evaporator.

[0009] When the external ambient temperature is low, the gas discharged from the compressor is passed into the evaporator so that the evaporator dissipates heat into the room, and the liquid after heat dissipation in the evaporator is drained to the photovoltaic panel and the photovoltaic panel is heated again with the help of high-temperature water supplied by the ground source heat pump.

[0010] In a possible implementation, the step of draining the liquid that has completed heat exchange to the photovoltaic panel through a liquid inlet pipe to cool the photovoltaic panel includes:

[0011] A heat sink is installed on the back of the photovoltaic panel, and the liquid inlet pipe is bent multiple times on the photovoltaic panel; the liquid inlet pipe cools the photovoltaic panel through the heat sink.

[0012] In a possible implementation, the low-temperature water supplied by the ground source heat pump and the condenser sequentially cooling the gas discharged from the compressor includes:

[0013] An outdoor fan is provided on a side of the heat dissipation plate away from the photovoltaic panel, and a protective cover is provided on the outer side of the outdoor fan and the heat dissipation plate;

[0014] The outdoor fan operates to make the gas in the external environment flow into the protective cover and flow toward the condenser after contacting the heat sink.

[0015] In one possible implementation, a connecting plate is provided between the heat sink and the condenser, and a plurality of cooling covers are mounted on the connecting plate. The inner cavity cross-section of the cooling cover facing the heat sink is larger than the inner cavity cross-section facing the outdoor fan side. The plurality of cooling covers are used for the flow of gas and to cool the gas flowing to the condenser.

[0016] In a possible implementation, a heat insulation plate is provided between the heat dissipation plate and the connecting plate, the heat insulation plate is sealed and fixed to the inner edge of the protective cover, and the heat insulation plate, the protective cover and the heat dissipation plate are used to enclose a closed cavity.

[0017] In a possible implementation, an inverter is installed at the outlet of the compressor, and the inverter is used to allow the gas discharged from the compressor to flow to the condenser or the evaporator.

[0018] In one possible implementation, a first heat exchanger is installed between the liquid inlet pipe and the compressor, and the first heat exchanger is connected to the ground source heat pump. The first heat exchanger is used to heat the liquid in the liquid inlet pipe with the help of high-temperature water provided by the ground source heat pump when the external ambient temperature is low.

[0019] In one possible implementation, a second heat exchanger is installed between the compressor and the condenser, and the second heat exchanger is connected to the ground source heat pump. The second heat exchanger is used to cool the gas with the help of low-temperature water provided by the ground source heat pump when the external ambient temperature is high.

[0020] In a possible implementation, the low-temperature water supplied by the ground source heat pump and the condenser sequentially cooling the gas discharged from the compressor includes:

[0021] According to the temperature in the external environment, the direction of the water flow of the ground source heat pump is changed by controlling the valve so that the water pumped by the ground source heat pump flows to the first heat exchanger or the second heat exchanger.

[0022] In a possible implementation, a liquid pipe is connected between the evaporator and the compressor, and the liquid pipe is used to drain the liquid from the evaporator to the compressor when the photovoltaic panel stops working.

[0023] The energy-saving method for generating electricity based on solar and thermal energy provided by the present invention offers the following advantages: Compared to existing technologies, when the ambient temperature is high, the evaporator absorbs indoor heat, causing the liquid in the evaporator to heat up and flow through the liquid inlet pipe to the photovoltaic panel. The photovoltaic panel is relatively hot during operation, and the liquid has a certain cooling effect on the panel. The heated liquid then flows into the compressor, which, after working, flows the gas into the condenser, where it is cooled a second time by the geothermal heat pump and the condenser.

[0024] When the external ambient temperature is low, the high-temperature and high-pressure gas discharged by the compressor flows directly into the evaporator, thereby dissipating heat into the room. After the heat is dissipated, the liquid in the evaporator is drained to the photovoltaic panel. At this time, the temperature of the photovoltaic panel is relatively low. The photovoltaic panel is heated twice by heating the liquid and the ground source heat pump to ensure the power generation efficiency of the photovoltaic panel.

[0025] In this application, through the cooperation of ground source heat pump, evaporator and condenser, the indoor temperature is regulated while ensuring the power generation efficiency of photovoltaic panels, ultimately reducing energy consumption, ensuring comfort while reducing operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1A flow chart of a method for generating electricity and saving energy based on light energy and heat energy provided by an embodiment of the present invention;

[0028] Figure 2 A schematic diagram of the connection between the photovoltaic panel, steam generator and outdoor fan provided in an embodiment of the present invention.

[0029] In the figure: 1. Evaporator; 2. Condenser; 3. Photovoltaic panel; 4. Heat sink; 5. Liquid inlet pipe; 6. Ground source heat pump; 7. Second heat exchanger; 8. First heat exchanger; 9. Outdoor fan; 10. Compressor. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] See also Figure 1 and Figure 2 The energy-saving method for generating electricity based on light energy and heat energy provided by the present invention is now described. The energy-saving method for generating electricity based on light energy and heat energy includes:

[0032] When the external ambient temperature is high, the evaporator 1 absorbs the heat in the room through the internal low-temperature liquid, and guides the liquid that has completed the heat exchange to the photovoltaic panel 3 through the liquid inlet pipe 5 to cool the photovoltaic panel 3.

[0033] The compressor 10 works on the liquid flowing in from the photovoltaic panel 3 to increase its temperature and pressure and form gas. The low-temperature water supplied by the ground source heat pump 6 and the condenser 2 cool the gas discharged from the compressor 10 in turn. After the second cooling, the gas is partially liquefied into liquid and flows into the evaporator 1.

[0034] When the external ambient temperature is low, the gas discharged from the compressor 10 is passed into the evaporator 1 so that the evaporator 1 dissipates heat into the room, and the liquid after heat dissipation in the evaporator 1 is drained to the photovoltaic panel 3 and the photovoltaic panel 3 is heated again with the help of high-temperature water supplied by the ground source heat pump 6.

[0035] The beneficial effect of the energy-saving method for generating electricity based on solar and thermal energy provided by the present invention is that, compared with the existing technology, when the ambient temperature is high, evaporator 1 absorbs indoor heat, causing the liquid in evaporator 1 to heat up and flow through liquid inlet pipe 5 to photovoltaic panel 3. The photovoltaic panel 3 is relatively hot during operation, and the liquid has a certain cooling effect on the photovoltaic panel 3. The heated liquid flows into compressor 10, which, after performing work, flows the gas into condenser 2. At this time, the gas is cooled a second time by the geothermal heat pump and condenser 2.

[0036] When the external ambient temperature is low, the high-temperature and high-pressure gas discharged by the compressor 10 flows directly into the evaporator 1, thereby dissipating heat into the room. After the heat dissipation is completed, the liquid in the evaporator 1 is drained to the photovoltaic panel 3. At this time, the temperature of the photovoltaic panel 3 is relatively low. The photovoltaic panel 3 is heated twice by heating the liquid and the ground source heat pump 6 to ensure the power generation efficiency of the photovoltaic panel 3.

[0037] In this application, through the cooperation of the ground source heat pump 6, the evaporator 1 and the condenser 2, the indoor temperature is adjusted while ensuring the power generation efficiency of the photovoltaic panel 3, ultimately reducing energy consumption, ensuring comfort while reducing operating costs.

[0038] Solar energy utilization is primarily divided into two aspects: photoelectric conversion and photothermal conversion. In the application of solar photovoltaic power generation, the efficiency and price of photovoltaic cells severely restrict its development. The power generation efficiency of crystalline silicon solar cells often depends on the cell's operating temperature. Every 1°C increase in temperature results in a 0.4% to 0.5% decrease in output power. Because over 80% of the energy reaching the cell surface is converted into heat, the operating temperature of solar cells is typically above 50°C, and can even reach 80°C when heat dissipation is poor, seriously affecting the cell's efficiency.

[0039] The geothermal heat pump system uses a small amount of high-quality energy (electricity) to extract low-quality energy stored underground for human consumption. In winter, when the temperature of the underground rock, soil, or water is higher than the ambient temperature, the heat pump system extracts this heat from the ground to provide heating for users. In summer, when the temperature of the underground rock, soil, or water is lower than the ambient temperature, the heat pump system absorbs the heat from the room and releases it back into the underground rock, soil, or water. Therefore, the geothermal heat pump system offers advantages such as high efficiency, energy saving, safety, reliability, and low operating costs.

[0040] The development of modern industry is driving an increasing demand for new energy sources. Currently, heating and cooling buildings primarily rely on electricity generated by thermal power plants. This energy generation requires the combustion of large amounts of fossil fuels, releasing significant amounts of greenhouse gases such as carbon dioxide and other harmful gases, posing a threat to the ecological environment. Consequently, a variety of clean energy technologies, such as solar energy and shallow geothermal energy, are attracting increasing attention. Shallow geothermal energy is primarily utilized through ground-source heat pumps (GSHPs), which utilize shallow soil or groundwater as a heat or cooling source for air conditioning, achieving both heating and cooling functions.

[0041] Currently, solar energy is mainly used for thermal utilization. Most solar power generation devices are placed on open space, occupying a large amount of land resources. They mainly use crystalline silicon solar panels, which are very expensive, consume a lot of energy in production, and their own temperature will increase during the power generation process.

[0042] The extensive use and overexploitation of fossil fuels like coal, oil, and natural gas have caused severe environmental pollution and energy shortages. These issues have become a top threat to human survival, making the development and utilization of clean energy particularly important. Solar energy, however, is highly susceptible to weather and has poor continuity, making it incapable of providing indoor heating on rainy days or at night. This limits its use in heating.

[0043] In some areas of northern my country, such as China, ground-source heat pump systems are increasingly popular, as they are less restricted by environmental conditions. These systems utilize the relatively stable underground soil temperature. Using a small amount of high-potential energy, they exchange heat with the earth through buried heat exchangers, achieving summer cooling, winter heating, and even domestic hot water.

[0044] During the year-round operation of the ground source heat pump 6 air conditioning system, in winter, the heat pump absorbs heat from the ground to heat the building, while the temperature around the underground pipes decreases; in summer, the heat in the building is transferred to the ground through the heat pump, cooling the building, while the temperature around the underground pipes increases.

[0045] The ground-source heat pump 6 can, to a certain extent, provide low-temperature water in the summer and warmer water in the winter. However, relying solely on the ground-source heat pump 6 cannot meet comfort requirements and effectively regulate the air. Furthermore, the photovoltaic panels 3 generate a certain amount of heat during use, which affects power generation efficiency. Therefore, the current focus is on how to organically integrate and optimize the solar photovoltaic panels 3, the ground-source heat pump 6, and the air conditioning system. More importantly, while existing systems can achieve heating in the winter, the corresponding efficiency is low.

[0046] In some embodiments of the energy-saving method for generating electricity based on light energy and heat energy provided in this application, please refer to Figure 2 , and draining the liquid that has completed heat exchange to the photovoltaic panel 3 through the liquid inlet pipe 5 to cool the photovoltaic panel 3 includes:

[0047] A heat sink 4 is installed on the back of the photovoltaic panel 3 , and a liquid inlet pipe 5 is bent multiple times on the photovoltaic panel 3 ; the liquid inlet pipe 5 cools the photovoltaic panel 3 through the heat sink 4 .

[0048] The photovoltaic panel 3 generates heat during use. To promptly absorb the heat from the photovoltaic panel 3 and ensure its conversion efficiency, a heat sink 4 is mounted on the back of the photovoltaic panel 3. A liquid inlet pipe 5 is mounted on the heat sink 4. The liquid inlet pipe 5 is bent multiple times on the heat sink 4 to increase the contact area with the heat sink 4. One end of the liquid inlet pipe 5 is connected to the evaporator 1, and the other end is connected to the compressor 10.

[0049] During actual application, the evaporator 1 will dissipate heat to the outside, so the temperature of the liquid inside will drop. The liquid with lower temperature will absorb the heat from the photovoltaic panel 3 when flowing through the heat sink 4, thereby lowering the temperature of the photovoltaic panel 3. At the same time, since the temperature of the liquid entering the compressor 10 increases, the work done by the compressor 10 will be reduced accordingly, thereby reducing the load of the compressor 10 and saving energy.

[0050] In some embodiments of the energy-saving method for generating electricity based on light energy and heat energy provided in this application, please refer to Figure 2 The low-temperature water supplied by the ground source heat pump 6 and the condenser 2 sequentially cool the gas discharged from the compressor 10, including:

[0051] An outdoor fan 9 is provided on a side of the heat sink 4 away from the photovoltaic panel 3 , and a protective cover is provided on the outer side of the outdoor fan 9 and the heat sink 4 .

[0052] The outdoor fan 9 operates to make the gas in the external environment flow into the protective cover and flow toward the condenser 2 after contacting the heat sink 4 .

[0053] In a traditional air-conditioning system, the condenser 2 is directly installed outdoors, and then the outdoor fan 9 is used to cool the condenser 2 so that the gas inside is liquefied. However, when the temperature of the external air is high, the gas in the condenser 2 will not be fully liquefied, which will eventually lead to poor cooling effect.

[0054] In order to solve the above problems, in this application, an outdoor fan 9 is installed on the back of the photovoltaic panel 3. A protective cover is provided on the outside of the outdoor fan 9 and the heat sink 4. An air inlet is installed on the protective cover. External gas can only enter the protective cover through the air inlet, and the gas entering the protective cover will first contact the heat sink 4 and then flow to the fan.

[0055] The liquid inlet pipe 5 can keep the heat sink 4 in a relatively low state. Normally, after running for a period of time, the temperature of the heat sink 4 will be lower than the temperature of the surrounding environment, which will cause the gas entering the protective cover to be cooled. The cooled gas will flow to the condenser 2 under the action of the outdoor fan 9, thereby improving the cooling effect on the condenser 2 to a certain extent and ensuring the complete liquefaction of the gas.

[0056] In some embodiments of the energy-saving method for generating electricity based on light energy and heat energy provided in this application, please refer to Figure 2 A connecting plate is provided between the heat sink 4 and the condenser 2, and multiple cooling covers are installed on the connecting plate. The inner cavity cross-section of the cooling cover facing the heat sink 4 is larger than the inner cavity cross-section facing the outdoor fan 9. The multiple cooling covers are used for the flow of gas and to cool the gas flowing to the condenser 2.

[0057] In order to further reduce the temperature of the gas in contact with the condenser 2, a connecting plate is provided between the outdoor fan 9 and the heat sink 4. A plurality of cooling covers are passed through the connecting plate. The inner cavity of the cooling cover is used for the gas to pass through, and the size of the inner cavity of the cooling cover facing the heat sink 4 is larger than the size of the inner cavity facing the outdoor fan 9. By virtue of the characteristic that the temperature of the gas will decrease when it is discharged from the cooling cover, the temperature of the gas blown to the condenser 2 is finally reduced, thereby ensuring the complete liquefaction of the gas.

[0058] In some embodiments of the energy-saving method for generating electricity based on light energy and heat energy provided in this application, please refer to Figure 2 A heat insulation plate is provided between the heat dissipation plate 4 and the connecting plate. The heat insulation plate is sealed and fixed to the inner edge of the protective cover. The heat insulation plate, the protective cover and the heat dissipation plate 4 are used to enclose a closed cavity.

[0059] In some areas such as northern my country, the outdoor temperature is low and may even be below zero. At this time, the conversion efficiency of the photovoltaic panel 3 is low, and the amount of electricity that can be generated is small. In order to ensure the temperature of the photovoltaic panel 3, a heat insulation board can be installed in the protective cover. The heat insulation board puts the liquid inlet pipe 5 and the heat sink 4 in a relatively closed environment. Since the compressor 10 is used for heating in winter, the temperature of the liquid discharged from the evaporator 1 is still relatively high. The heat sink 4 is heated by the higher liquid inlet pipe 5. Due to the obstruction of the heat insulation board, the heat can only be transferred to the photovoltaic panel 3, thereby achieving the purpose of heating the photovoltaic panel 3. After the photovoltaic panel 3 is heated, the corresponding conversion efficiency will be improved, and the converted electricity will also increase.

[0060] In some embodiments of the energy-saving method for generating electricity based on light energy and heat energy provided in this application, please refer to Figure 2 An inverter is installed at the outlet of the compressor 10, and the inverter is used to make the gas discharged from the compressor 10 flow to the condenser 2 or the evaporator 1.

[0061] Air conditioners consume relatively little electricity in the summer, but in the winter, due to the lower outside temperatures, especially at night, heat exchange is inconvenient, leading to higher power consumption. Consequently, air conditioners are often left idle during the winter. In northern my country, coal is often used for heating, which results in a corresponding increase in resource waste.

[0062] To address this issue, an inverter is installed at the outlet of compressor 10 and connects it to evaporator 1 inside the room. In summer, the exhaust gas from compressor 10 passes through the inverter and enters condenser 2, completing heat exchange with the air. In winter, the high-temperature, high-pressure exhaust gas from compressor 10 is directly passed through the inverter to evaporator 1, ultimately achieving a heating effect.

[0063] Two control valves are installed in the converter, and the flow direction is changed by opening one control valve and closing the other.

[0064] In some embodiments of the energy-saving method for generating electricity based on light energy and heat energy provided in this application, please refer to Figure 2 A first heat exchanger 8 is installed between the liquid inlet pipe 5 and the compressor 10. The first heat exchanger 8 is connected to the ground source heat pump 6. The first heat exchanger 8 is used to heat the liquid in the liquid inlet pipe 5 with the help of high-temperature water provided by the ground source heat pump 6 when the external ambient temperature is low.

[0065] In winter, since the outdoor temperature is low and the condenser 2 is in a cut-off state in this application, there is no need to operate the outdoor fan 9. For the same reason, since the outlet water temperature in the ground source is high in winter, a first heat exchanger 8 is installed at the connection between the liquid inlet pipe 5 and the compressor 10. The ground source heat pump 6 pumps the high-temperature water from the underground to the ground and then exchanges heat with the liquid in the liquid inlet pipe 5. Due to the increase in the temperature of the liquid in the liquid inlet pipe 5, the power required for the compressor 10 to do work can be reduced, thereby reducing resource consumption.

[0066] In some embodiments of the energy-saving method for generating electricity based on light energy and heat energy provided in this application, please refer to Figure 2 A second heat exchanger 7 is installed between the compressor 10 and the condenser 2. The second heat exchanger 7 is connected to the ground source heat pump 6. The second heat exchanger 7 is used to cool the gas with the help of low-temperature water provided by the ground source heat pump 6 when the external ambient temperature is high.

[0067] In summer, since the temperature of the gas discharged from the compressor 10 is relatively high, it is necessary to dissipate heat through the condenser 2, etc. In this application, in order to improve the cooling effect of the condenser 2, the liquid inlet pipe 5 cools the heat sink 4, and at the same time, the liquid inlet pipe 5, the heat sink 4 and the cooling cover are used to reduce the temperature of the incoming external air, thereby improving the cooling effect of the condenser 2. However, the above method may still not be able to effectively reduce the temperature of the gas in the condenser 2.

[0068] To this end, a second heat exchanger 7 can be installed between the condenser 2 and the compressor 10. In summer, low-temperature water is pumped to the second heat exchanger 7 through the ground source heat pump 6. The gas discharged from the compressor 10 is first cooled by the second heat exchanger 7, and then subsequent cooling is carried out, thereby ultimately improving the cooling effect.

[0069] In some embodiments of the energy-saving method for generating electricity based on light energy and heat energy provided in this application, please refer to Figure 2 The low-temperature water supplied by the ground source heat pump 6 and the condenser 2 sequentially cool the gas discharged from the compressor 10, including:

[0070] According to the temperature in the external environment, the direction of the water flow of the ground source heat pump 6 is changed by controlling the valve so that the water extracted by the ground source heat pump 6 flows to the first heat exchanger 8 or the second heat exchanger 7.

[0071] By properly arranging the direction of water flow in the ground source heat pump 6, different functions can be achieved.

[0072] In some embodiments of the energy-saving method for generating electricity based on light energy and heat energy provided in the present application, a liquid pipe is connected between the evaporator 1 and the compressor 10, and the liquid pipe is used to drain the liquid in the evaporator 1 to the compressor 10 when the photovoltaic panel 3 stops working.

[0073] At night or other times, the photovoltaic panel 3 cannot generate heat, so the liquid in the evaporator 1 can be directly drained to the compressor 10 to reduce energy consumption. At this time, the ground source heat pump 6 is in a closed state.

[0074] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An energy-saving method for generating electricity based on light energy and heat energy, characterized in that: include: When the external ambient temperature is high, the evaporator absorbs the heat in the room through the internal low-temperature liquid, and drains the liquid that has completed the heat exchange to the photovoltaic panel through the liquid inlet pipe to cool the photovoltaic panel; The compressor works on the liquid flowing in from the photovoltaic panel to increase its temperature and pressure and form gas. The low-temperature water supplied by the ground-source heat pump and the condenser sequentially cool the gas discharged from the compressor. After the secondary cooling, the gas is partially liquefied into liquid and flows into the evaporator. When the external ambient temperature is low, the gas discharged from the compressor is passed through the evaporator so that the evaporator dissipates heat into the room, and the liquid after dissipation of heat in the evaporator is drained to the photovoltaic panel and the photovoltaic panel is heated again by the high-temperature water supplied by the ground-source heat pump; The step of draining the liquid that has completed heat exchange to the photovoltaic panel through the liquid inlet pipe to cool the photovoltaic panel includes: A heat sink is installed on the back of the photovoltaic panel, and the liquid inlet pipe is bent multiple times on the photovoltaic panel; the liquid inlet pipe cools the photovoltaic panel through the heat sink; The low-temperature water supplied by the ground source heat pump and the condenser sequentially cool the gas discharged from the compressor, including: An outdoor fan is provided on a side of the heat dissipation plate away from the photovoltaic panel, and a protective cover is provided on the outer side of the outdoor fan and the heat dissipation plate; The outdoor fan operates to cause the gas in the external environment to flow into the protective cover and then flow toward the condenser after contacting the heat sink; An inverter is installed at the outlet of the compressor, and the inverter is used to make the gas discharged from the compressor flow to the condenser or the evaporator; A first heat exchanger is installed between the liquid inlet pipe and the compressor, the first heat exchanger is connected to the ground source heat pump, and the first heat exchanger is used to heat the liquid in the liquid inlet pipe with the help of high-temperature water provided by the ground source heat pump when the external ambient temperature is low; A second heat exchanger is installed between the compressor and the condenser. The second heat exchanger is connected to the ground source heat pump. The second heat exchanger is used to cool the gas with the help of low-temperature water provided by the ground source heat pump when the external ambient temperature is high.

2. The method for generating electricity and saving energy based on light energy and heat energy according to claim 1, characterized in that: A connecting plate is provided between the heat sink and the condenser, and a plurality of cooling covers are mounted on the connecting plate. The inner cavity cross-section of the cooling cover facing the heat sink is larger than the inner cavity cross-section facing the outdoor fan side. The plurality of cooling covers are used for the flow of gas and for cooling the gas flowing toward the condenser.

3. The method for generating electricity and saving energy based on light energy and heat energy according to claim 2, characterized in that: A heat insulation plate is provided between the heat dissipation plate and the connecting plate. The heat insulation plate is sealed and fixed to the inner edge of the protective cover. The heat insulation plate, the protective cover and the heat dissipation plate are used to enclose a closed cavity.

4. The method for generating electricity and saving energy based on light energy and heat energy according to claim 1, wherein: The low-temperature water supplied by the ground source heat pump and the condenser sequentially cool the gas discharged from the compressor, including: According to the temperature in the external environment, the direction of the water flow of the ground source heat pump is changed by controlling the valve so that the water pumped by the ground source heat pump flows to the first heat exchanger or the second heat exchanger.

5. The method for generating electricity and saving energy based on light energy and heat energy according to claim 1, wherein: A liquid pipe is connected between the evaporator and the compressor, and the liquid pipe is used to drain the liquid from the evaporator to the compressor when the photovoltaic panel stops working.

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