A power generation system that uses the temperature difference between the planet's surface and underground to generate electricity using solar energy

Abstract

The present invention is a system for generating electricity using the temperature difference between the surface and underground of a planet in combination with solar energy. Utilizing the temperature difference between the surface and underground of a planet that has the opportunity to be exposed to sunlight, a uniquely structured ground heat exchanger is used on a planet that can be periodically exposed to sunlight to fully utilize its surface and underground heat and cold sources. The system then combines this with an organic Rankine cycle to perform heat-to-work conversion, thereby achieving thermoelectric power generation on the planet. To save costs, the present invention uses a reasonable structural design to enable the heat-to-work conversion system to operate in both forward and reverse directions. To adapt to different usage scenarios, the present invention can flexibly select different working fluids based on the specific temperature conditions of the planet, so that the system's power generation efficiency can always reach the optimal level for the current situation. This type of power generation method can largely get rid of dependence on solar radiation, and can also obtain relatively stable, high-quality electricity in places where sunlight cannot always be irradiated.

Description

Technical Field

[0001] The present invention belongs to the field of energy technology, relates to an organic Rankine cycle, a ground heat exchanger, and particularly to a power generation system for thermal conversion on any solid planet using the temperature difference between the planet's surface and underground. Background Art

[0002] Access to high-quality electricity is one of the major obstacles to human exploration of extraterrestrial planets. Currently, power generation on solid planets other than Earth mostly relies on solar power. However, solar power cannot meet human energy needs when sunlight intensity is insufficient or the duration of sunlight is insufficient to meet electricity consumption patterns. Summary of the Invention

[0003] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a system and method for generating electricity mainly by utilizing the temperature difference between the surface and underground of a solid planet, so as to achieve the purpose of obtaining more electrical energy under limited sunlight, and solve the problem of shortage of high-quality energy due to the limitation of sunlight when humans explore extraterrestrial space.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A power generation system that combines solar energy and utilizes the temperature difference between the surface and underground of a planet, comprising an expander, a battery, a solar photovoltaic panel, a first heat exchanger, a second heat exchanger, and several pumps and switch valves; the first heat exchanger is buried in the shallow surface layer of the planet, and the second heat exchanger is buried underground; the solar photovoltaic panel is arranged on the surface of the planet to receive solar energy and convert it into electrical energy; the expander is connected to a generator to generate electricity; the solar photovoltaic panel supplies power to each pump directly or through the battery; the first heat exchanger and the second heat exchanger each have a first port and a second port;

[0006] The outlet of the expander is divided into two branches, one of which is connected to the first port of the heat exchanger 2 through the switch valve 1, and the other is connected to the second port of the heat exchanger 1 through the switch valve 3 and the parallel pump 2 and the switch valve 5; wherein the outlet of the pump 2 is connected to the second port of the heat exchanger 1;

[0007] The inlet of the expander is divided into two branches, one of which is connected to the first port of the heat exchanger 2 through the switch valve 2, and the other is connected between the switch valve 3 and the inlet of the pump 2 through the switch valve 4;

[0008] The first port of the heat exchanger 1 is divided into two branches, which are respectively connected to the second port of the heat exchanger 2 through pump 1 and the series-connected switch valve 6 and pump 5; the outlet of pump 1 is connected to the first port of the heat exchanger 1, and the outlet of pump 5 is connected to the second port of the heat exchanger 2.

[0009] In one embodiment, the heat exchanger is a ground heat exchanger, which is laid flat on the ground and 0.5-2 meters away from the ground. It consists of two parallel pipelines and several branches connected between the parallel pipelines. The ports in the same direction of the two parallel pipelines are respectively the first port and the second port.

[0010] In one embodiment, the branch pipes are arranged horizontally and are vertically connected between the two parallel pipelines.

[0011] In one embodiment, the second heat exchanger is a heat exchanger buried underground.

[0012] In one embodiment, the power generation system further comprises: a working fluid tank;

[0013] The inlet of the working medium tank is connected to the first port of the heat exchanger 1 through the pump 3;

[0014] The outlet of the working medium tank is connected to the first port of the heat exchanger 1 through a pump 4;

[0015] The inlet and outlet directions of the pump three and the pump four are opposite. The working fluid tank stores the working fluid of the system and regulates the pressure of various parts of the working fluid in the system through the pump three and the pump four.

[0016] The present invention also provides a power generation method based on the power generation system that combines solar energy and uses the temperature difference between the surface and underground of the planet:

[0017] When the underground temperature is higher than the surface temperature, the working fluid performs work according to the following process:

[0018] Open switch valve 5, switch valve 4, switch valve 1, and pump 1, and close other pumps and switch valves. The first port of heat exchanger 1 is the inlet and the second port is the outlet. The second port of heat exchanger 2 is the inlet and the first port is the outlet. The liquid working medium evaporates into superheated steam in heat exchanger 1 to obtain gaseous working medium. The gaseous working medium passes through switch valve 5 and switch valve 4 and enters the expander to expand and perform work. The working medium after performing work passes through switch valve 1 from the outlet of the expander and enters heat exchanger 2 to condense into liquid working medium. The liquid working medium enters pump 1 from the outlet of heat exchanger 2. The pressurized working medium flowing out of the outlet of pump 1 enters heat exchanger 1 to enter the next cycle.

[0019] When the underground temperature is lower than the surface temperature, the working fluid performs work according to the following process:

[0020] Open switch valve 2, switch valve 3, switch valve 6, pump 2, and pump 5, and close other pumps and switch valves. The first port of heat exchanger 2 is the inlet and the second port is the outlet. The second port of heat exchanger 1 is the inlet and the first port is the outlet. The liquid working medium evaporates into superheated steam in heat exchanger 2 to obtain gaseous working medium. The gaseous working medium passes through switch valve 2 and enters the expander to expand and do work. The working medium after doing work passes through switch valve 3 from the outlet of the expander and enters pump 2 to the surface and enters heat exchanger 1 to condense into liquid working medium. The liquid working medium flows out of heat exchanger 1 and passes through switch valve 6 into pump 5. The pressurized working medium flowing out of the outlet of pump 5 enters heat exchanger 2 to enter the next cycle.

[0021] In one embodiment, the first pump pressurizes the liquid working medium to the evaporation pressure of the working medium at the corresponding working temperature; the fifth pump pressurizes the liquid working medium to the evaporation pressure of the working medium at the corresponding working temperature.

[0022] In one embodiment, when the power generation system includes a working fluid tank, then:

[0023] When switching from low underground temperature to high underground temperature, use Pump 3 to pump excess working fluid from the heat-to-work conversion circuit into the working fluid tank to reduce the overall pressure of the system; when switching from high underground temperature to low underground temperature, use Pump 4 to pump working fluid from the working fluid tank into the heat-to-work conversion circuit to increase the overall pressure of the system.

[0024] The basic principle of the present invention is:

[0025] On planets that are periodically exposed to sunlight, there is often a temperature difference between the surface and underground. Using ground-based heat exchangers to capture the planet's heat and cooling sources, and then using an organic Rankine cycle to convert heat into work, thermoelectric power generation can be achieved. This power generation method can largely eliminate dependence on solar radiation, allowing for the generation of relatively stable, high-quality electricity even in areas where sunlight is not always available.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. Use the ground heat exchanger with unique structure to make full use of the heat and cold sources on the surface and underground of the planet.

[0028] 2. Through reasonable structural design, the heat-to-work conversion system can run in both forward and reverse directions.

[0029] 3. When there is sunlight, the solar photovoltaic panels are used to power the pump and store the electricity in the battery. When there is no sunlight, the batteries are used to power the pump. This design allows the system to operate stably even without direct sunlight.

[0030] 4. According to different usage scenarios, different working fluids can be flexibly selected to ensure that the system's power generation efficiency can always reach the optimal level under the current circumstances.

[0031] 5. Through special structural design, the system can realize the functions of two circulation directions with one expander, which greatly reduces the material cost and installation cost of the system.

[0032] 6. The present invention uses completely clean energy - solar energy and geothermal energy, which is completely free of any energy pollution. It can protect the earth's environment and keep the original ecology of other planets from being polluted by foreign substances. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The invention relates to a power generation system using the temperature difference between the surface and underground of a planet in combination with solar energy.

[0034] Figure 2 This is the circuit described in the present invention when the ground temperature is higher.

[0035] Figure 3 This is the circuit described in the present invention when the underground temperature is higher.

[0036] Figure 4 This invention Figure 2 Circuit direction shown Figure 3 The shown circuit is a step-down circuit when the circuit is converted.

[0037] Figure 5 This invention Figure 3 Circuit direction shown Figure 2 The boost circuit during circuit conversion shown.

[0038] Figure 6 This is the solar photovoltaic panel power supply circuit of the present invention.

[0039] Figure 7 This is the style of the ground heat exchanger described in the present invention. DETAILED DESCRIPTION

[0040] The embodiments of the present invention are described in detail below with reference to the accompanying drawings and examples.

[0041] like Figure 1 As shown, the present invention is a system for generating electricity using the temperature difference between the surface and underground of a planet in combination with solar energy, comprising:

[0042] Heat exchanger 11, buried in the shallow surface of the planet, is used to exchange heat between the system's working fluid and the surface soil, either evaporating or condensing the working fluid. Its operating principle is to use the surface soil as a heat source or cooling source to exchange heat with the working fluid, causing it to evaporate or condense.

[0043] Heat exchanger 2, buried underground, is used to exchange heat between the system's working fluid and the subsurface soil, either evaporating or condensing the working fluid. Its operating principle is to use the subsurface soil as a heat source or cooling source to exchange heat with the working fluid, causing it to evaporate or condense.

[0044] The expander 6 is used to convert the working fluid of the system into heat and work. Specifically, it can be connected to a generator to generate electricity. The surrounding switch valves 2 4, 1 5, 4 9 and 3 10 can change the flow path of the working fluid, so that the expander 6 can be used normally in both forward and reverse cycles.

[0045] Solar photovoltaic panels 14 and batteries 15 are used to absorb solar energy to provide a small amount of electricity and store backup energy for use when there is no direct sunlight. The solar photovoltaic panels 14 are arranged on the surface of the planet to receive solar energy and convert it into electricity, which is then used to power the pumps directly or through the batteries 15.

[0046] Among them, heat exchanger 11 and heat exchanger 21 have a first port and a second port respectively. Heat exchanger 11 is a ground heat exchanger, which can be laid flat and shallowly buried on the ground at a height of 0.5-2 meters from the ground. It consists of two parallel pipes and a number of branches connected between the parallel pipes. The ports in the same direction of the two parallel pipes are the first port and the second port respectively. Each branch is arranged horizontally and is vertically connected between the two parallel pipes. In other words, in a top view, its pipeline is designed as a "mesh" structure, and the working fluid enters from one vertical part of the "mesh", and after fully exchanging heat with the surface soil in the heat exchanger, it comes out from the other vertical part of the "mesh". Heat exchanger 21 can be any type of heat exchanger buried deep underground.

[0047] Furthermore, the present invention also includes:

[0048] The working fluid tank 8 stores the working fluid of the system, and its inlet is connected to the first port of the heat exchanger 11 through the pump 3 16; its outlet is connected to the first port of the heat exchanger 11 through the pump 4 7.

[0049] Pump 1 2, Pump 5 17, and Pump 2 13, powered by solar panels 14 or batteries 15, are used to pressurize the working fluid in the system and overcome friction and gravity, ensuring normal operation. Pump 1 2 and Pump 5 17 are each capable of pressurizing the liquid working fluid to the vapor pressure of the working fluid at the corresponding operating temperature.

[0050] Pump 3 16 and Pump 4 7 are used to pump the working fluid into and out of working fluid tank 8, respectively, thereby reducing and increasing the pressure of the system. Specifically, Pump 3 16 and Pump 4 7 have opposite inlet and outlet directions, and Pump 3 16 and Pump 4 7 regulate the pressure of various components of the working fluid in the system.

[0051] Depending on the usage, the working medium of the system of the present invention can undergo an evaporation process or a condensation process in heat exchanger 11, or can undergo an evaporation process or a condensation process in heat exchanger 1.

[0052] More specifically, the main connection method of the above-mentioned parts of the power generation system of the present invention is:

[0053] Starting from the outlet of the expander 6, the outlet of the expander 6 is connected to two branches, one branch is connected to one end of the switch valve 1 5, and the other end of the switch valve 1 5 is connected to two branches, one branch is connected to the first port of the heat exchanger 2 1, and the other branch of the switch valve 1 5 is connected to one end of the switch valve 2 4. The other branch of the outlet of the expander 6 is connected to one end of the switch valve 3 10, and the other end of the switch valve 3 10 is connected to three branches, the first branch is connected to one end of the switch valve 4 9, the second branch is connected to the inlet of the pump 2 13, and the third branch is connected to one end of the switch valve 5 12. The other end of the switch valve 2 4 has two branches, one is connected to the inlet of the switch valve 4 9, and the other branch is connected to the inlet of the expander 6. The other end of the switch valve 5 12 is connected to two branches. The first port of heat exchanger 11 is connected to four branches, one branch is connected to the inlet of pump 3 16, the second branch is connected to the outlet of pump 4 7, the third branch is connected to the outlet of pump 1 2, the fourth branch is connected to one end of switch valve 6 3, the other end of switch valve 6 3 is connected to the inlet of pump 5 17, the outlet of pump 3 16 is connected to the inlet of working fluid tank 8, the outlet of working fluid tank 8 is connected to the inlet of pump 4 7, the outlet of pump 5 17 is connected to two branches, one branch is connected to the inlet of pump 1 2, and the other branch is connected to the second port of heat exchanger 2 1; pump 1 2, pump 2 13, pump 3 16 and pump 4 7 are powered by battery 15 and solar photovoltaic panel 14.

[0054] Based on the above system, the workflow of the present invention is as follows:

[0055] like Figure 2The circuit shown is a circuit used by the present invention when the ground temperature is higher than the underground temperature. At this time, the ground is often directly exposed to sunlight, and solar photovoltaic panels 14 can be used to power Pump 2. Open valves 5 12, 4 9, 5, and Pump 2, and close other pumps and valves. Heat exchanger 11 has its first port as the inlet and its second port as the outlet. Heat exchanger 2 has its second port as the inlet and its first port as the outlet. The specific circulation process of the working fluid is as follows: liquid working fluid evaporates into superheated steam in heat exchanger 11, producing gaseous working fluid. The gaseous working fluid passes through valves 5 12 and 4 9, entering expander 6 to expand and perform work. After performing work, the working fluid passes from the outlet of expander 6 through valve 1 5 and enters heat exchanger 2 1, where it condenses into liquid working fluid. The liquid working fluid then enters pump 2 from the outlet of heat exchanger 2 1. The pressurized working fluid flowing out of pump 2 enters heat exchanger 11, entering the next cycle.

[0056] like Figure 3 The circuit shown is the circuit of the present invention for use when the underground temperature is higher than the surface temperature. In this case, there is often no direct sunlight on the surface, and battery 15 is required to power pump 2 13 and pump 5 17. Open valve 2 4, valve 3 10, valve 6 3, pump 2 13, and pump 5 17. Close the other pumps and valves. Heat exchanger 2 1 has its first port as the inlet and its second port as the outlet. Heat exchanger 1 1 has its second port as the inlet and its first port as the outlet. The specific circulation process of the working fluid is as follows: the liquid working fluid evaporates into superheated steam in the heat exchanger 2 1 to obtain a gaseous working fluid. The gaseous working fluid enters the expander 6 through the switch valve 2 4 to expand and perform work. The working fluid after performing work passes from the outlet of the expander 6 through the switch valve 3 10, enters the pump 2 13, is pumped to the surface, and enters the heat exchanger 1 11 to condense into a liquid working fluid. After flowing out of the heat exchanger 1 11, the liquid working fluid passes through the switch valve 6 3 and enters the pump 5 17. The pressurized working fluid flowing out of the outlet of the pump 5 17 enters the heat exchanger 2 1 to enter the next cycle.

[0057] Regardless of the working fluid operation mode, the expander 6 uses the same port as the working fluid inlet and the other port as the working fluid outlet, and the expander 6 is connected to the generator to generate electricity.

[0058] According to the switching between the surface temperature and the ground temperature, the system of the present invention can adjust the overall pressure:

[0059] like Figure 4 The circuit shown is the circuit used by the present invention when the scene of ground temperature higher than underground temperature transitions to the scene of ground temperature lower than underground temperature. In this case, regardless of the often weak direct sunlight on the ground surface, the battery 15 can be used to power the pump 3 16. The specific process is: Figure 2In the circuit shown, the on-off valve 4 9 is closed, the on-off valve 3 10 is opened, the pump 1 2 is turned off, and the on-off valve 6 3 is opened. After the pressure of the working fluid in the circuit stabilizes, the pump 3 16 is turned on to pump the excess working fluid from the circuit into the working fluid tank 8, thereby achieving a depressurization process for the entire system. At this time, the overall pressure of the system is reduced.

[0060] like Figure 5 The circuit shown is the circuit used by the present invention when the scene where the ground temperature is lower than the underground temperature transitions to the scene where the ground temperature is lower than the underground temperature. In this case, regardless of the relatively weak direct sunlight on the ground surface, the battery 15 can be used to power the pump 29 7. The specific process is: Figure 3 In the circuit shown, the second on-off valve 4 is closed, the first on-off valve 5 is opened, and after the pressure of the working fluid in the circuit stabilizes, the fourth pump 7 is turned on to pump the working fluid from the working fluid tank 8 into the circuit, thereby achieving a pressure-increasing process for the entire system. At this time, the overall pressure of the system increases.

[0061] like Figure 6 The system shown is the power supply system of the pump of the present invention. The power supply of the pump can be either a solar photovoltaic panel 14 or a battery 15. These are independent of each other, but are connected to the solar photovoltaic panel 14 and the battery 15 respectively, and the solar photovoltaic panel 14 is connected to the battery 15.

[0062] like Figure 7 The structure shown in is a top view of the ground heat exchanger structure in the present invention. This heat exchanger is buried in the soil and exchanges heat with the soil. The working fluid enters from port A or port B, and after fully exchanging heat with the soil in the "louver" structure, it exits from the other port. As needed, this structure can be used on heat exchanger 11 or on heat exchanger 1 and heat exchanger 2 1 at the same time. This "louver" structure allows the heat exchanger pipes to be evenly arranged, and the working fluid in the heat exchanger can make full use of the surface area to maximize the absorption of heat or cold in the surface soil. During operation, the soil around the heat exchanger directly exchanges heat with the heat exchanger pipe closest to it, and the heat exchanger pipe directly exchanges heat with the working fluid in the heat exchanger. The working fluid after heat exchange flows into another confluence point that is not the import port and continues to flow forward.

[0063] In summary, the present invention exploits the temperature difference between the surface and underground of a planet. On a planet periodically exposed to sunlight, a ground-based heat exchanger is used to capture the planet's heat and cooling sources. This is then converted to power using an organic Rankine cycle, thereby achieving thermoelectric power generation. The present invention utilizes a uniquely structured ground-based heat exchanger to fully utilize the heat and cooling sources on the planet's surface and underground. Through a rational structural design, the present invention enables the heat-to-power conversion system to operate in both forward and reverse directions. The present invention flexibly selects different working fluids based on different usage scenarios, ensuring that the system's power generation efficiency is always optimized for the given situation. Through its unique structural design, the present invention uses a single expander to achieve both circulation directions, significantly reducing the system's material and installation costs. The present invention utilizes completely clean energy sources—solar and geothermal—without any energy pollution, protecting Earth's environment and preserving the pristine ecosystems of other planets from contamination by foreign substances. This power generation method significantly eliminates dependence on solar radiation, allowing for the generation of relatively stable, high-quality electricity even in areas where sunlight is not always available.

Claims

1. A power generation system that combines solar energy and uses the temperature difference between the surface and underground of a planet, characterized in that: The invention comprises an expander (6), a battery (15), a solar photovoltaic panel (14), a heat exchanger 1 (11), a heat exchanger 2 (1), and a plurality of pumps and switch valves; the heat exchanger 1 (11) is buried in the shallow layer of the surface of the planet, and the heat exchanger 2 (1) is buried in the underground of the planet; the solar photovoltaic panel (14) is arranged on the surface of the planet to receive solar energy and convert it into electrical energy; the expander (6) is connected to a generator to generate electricity; the solar photovoltaic panel (14) directly or through the battery (15) supplies power to each pump; the heat exchanger 1 (11) and the heat exchanger 2 (1) respectively have a first port and a second port; The outlet of the expander (6) is divided into two branches, one of which is connected to the first port of the heat exchanger (1) through the switch valve (5), and the other is connected to the second port of the heat exchanger (11) through the switch valve (10) and the parallel pump (13) and the switch valve (12); wherein the outlet of the pump (13) is connected to the second port of the heat exchanger (11); The inlet of the expander (6) is divided into two branches, one of which is connected to the first port of the heat exchanger (1) through the second switch valve (4), and the other is connected between the third switch valve (10) and the inlet of the second pump (13) through the fourth switch valve (9); The first port of the heat exchanger 1 (11) is divided into two branches, which are respectively connected to the second port of the heat exchanger 2 (1) through the pump 1 (2) and the series-connected switch valve 6 (3) and the pump 5 (17); wherein the outlet of the pump 1 (2) is connected to the first port of the heat exchanger 1 (11), and the outlet of the pump 5 (17) is connected to the second port of the heat exchanger 2 (1).

2. The power generation system combining solar energy and utilizing the temperature difference between the surface and underground of a planet according to claim 1, characterized in that: The heat exchanger 1 (11) is a ground heat exchanger, which is laid flat on the ground and 0.5-2 meters away from the ground. It consists of two parallel pipelines and a number of branch pipes connected between the parallel pipelines. The ports in the same direction of the two parallel pipelines are respectively the first port and the second port.

3. The power generation system combining solar energy and utilizing the temperature difference between the surface and underground of a planet according to claim 2, characterized in that: The branch pipes are arranged horizontally and are vertically connected between the two parallel pipelines.

4. The power generation system combining solar energy and utilizing the temperature difference between the surface and underground of a planet according to claim 1, characterized in that: The heat exchanger 2 (1) is a heat exchanger buried underground.

5. The power generation system combining solar energy and utilizing the temperature difference between the surface and underground of a planet according to claim 1, characterized in that: The power generation system further comprises: a working medium tank (8); The inlet of the working medium tank (8) is connected to the first port of the heat exchanger (11) via the pump (16); The outlet of the working medium tank (8) is connected to the first port of the heat exchanger (11) via the pump (7); The inlet and outlet directions of the pump three (16) and the pump four (7) are opposite, and the working fluid tank (8) stores the working fluid of the system and regulates the pressure of various parts of the working fluid in the system through the pump three (16) and the pump four (7).

6. A method for generating electricity based on a power generation system combining solar energy and utilizing the temperature difference between the surface and underground of a planet according to any one of claims 1 to 5, characterized in that: When the underground temperature is higher than the surface temperature, the working fluid performs work according to the following process: Open the switch valve five (12), the switch valve four (9), the switch valve one (5), and the pump one (2), and close the other pumps and switch valves. The first port of the heat exchanger one (11) is the inlet and the second port is the outlet. The second port of the heat exchanger two (1) is the inlet and the first port is the outlet. The liquid working medium evaporates into superheated steam in the heat exchanger one (11) to obtain a gaseous working medium. The gaseous working medium passes through the switch valve five (12) and the switch valve four (9) and enters the expander (6) to expand and do work. The working medium after doing work passes through the switch valve one (5) from the outlet of the expander (6) and enters the heat exchanger two (1) to condense into a liquid working medium. The liquid working medium enters the pump one (2) from the outlet of the heat exchanger two (1). The pressurized working medium flowing out of the outlet of the pump one (2) enters the heat exchanger one (11) and enters the next cycle. When the underground temperature is lower than the surface temperature, the working fluid performs work according to the following process: Open the switch valve 2 (4), the switch valve 3 (10), the switch valve 6 (3), the pump 2 (13), and the pump 5 (17), and close the other pumps and switch valves. The first port of the heat exchanger 2 (1) is the inlet and the second port is the outlet. The second port of the heat exchanger 1 (11) is the inlet and the first port is the outlet. The liquid working medium evaporates into superheated steam in the heat exchanger 2 (1) to obtain a gaseous working medium. The gaseous working medium passes through the switch valve 2 (4) and enters the expander (6) to expand and do work. The working medium after doing work passes through the switch valve 3 (10) from the outlet of the expander (6) and enters the pump 2 (13) to be pumped to the surface and enter the heat exchanger 1 (11) to condense into a liquid working medium. The liquid working medium flows out of the heat exchanger 1 (11) and passes through the switch valve 6 (3) to enter the pump 5 (17). The pressurized working medium flowing out of the outlet of the pump 5 (17) enters the heat exchanger 2 (1) and enters the next cycle.

7. The power generation method according to claim 6, wherein the power generation system combines solar energy with the temperature difference between the surface and underground of the planet, The pump 1 (2) pressurizes the liquid working medium to the evaporation pressure of the working medium at the corresponding working temperature; the pump 5 (17) pressurizes the liquid working medium to the evaporation pressure of the working medium at the corresponding working temperature.

8. The power generation method according to claim 4, wherein the power generation system combines solar energy with the temperature difference between the surface and underground of a planet, When the power generation system includes a working medium tank (8), then: When switching from low underground temperature to high underground temperature, the third pump (16) is used to pump the excess working fluid from the heat-work conversion circuit into the working fluid tank (8) to reduce the overall pressure of the system; when switching from high underground temperature to low underground temperature, the fourth pump (7) is used to pump the working fluid from the working fluid tank (8) into the heat-work conversion circuit to increase the overall pressure of the system.

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