A novel solar-coupled air-water dual-source heat pump system based on thermal diodes

Abstract

The present invention provides a novel solar-coupled air-water dual-source heat pump system based on a thermal diode. In this system, circulating water in the heating network exchanges heat with a heat pump working fluid in the air-water dual-source heat pump condenser. A portion of the cooled heat pump working fluid enters the thermal diode for heat exchange with hot water from the solar PVT panel. The heated heat pump working fluid enters the compressor, while the remaining portion enters the air-water dual-source heat pump evaporator, where it is heated and heated using an air or water source. The heated heat pump working fluid is then mixed with the heat pump working fluid output from the thermal diode in the compressor for pressure-boosting. The heated and pressurized heat pump working fluid then enters the air-water dual-source heat pump condenser for continued heat exchange with the circulating water in the heating network. The heating system of the present invention is particularly suitable for operation under complex and changeable climatic conditions and can be widely used in heating in cold regions, industrial and agricultural hot water supply, and other fields.

Description

Technical Field

[0001] The present invention belongs to the technical field of cogeneration of heat and power, and in particular relates to a novel solar-coupled air-water dual-source heat pump system based on thermal diodes. Background Art

[0002] With the intensification of the global energy crisis and the growing demand for low-carbon and environmentally friendly technologies, multi-energy complementary systems that combine heating, cooling, and electricity supply are becoming an important development direction in the energy utilization field. Traditional heating systems typically rely on a single energy source, such as coal, natural gas, or electricity. This approach is not only energy-inefficient but also susceptible to energy price fluctuations and unstable supply. Furthermore, in regions with complex climatic conditions, the operating efficiency of heating systems is often limited by ambient temperature fluctuations. In cold regions or on cloudy days, the energy efficiency of heating systems decreases significantly, making it difficult to meet user heating needs.

[0003] In recent years, solar energy, as a renewable and clean energy source, has been increasingly used in the heating sector. Solar photovoltaic-thermoelectric (PVT) modules not only provide clean electricity but can also provide heat for heat pumps through photothermal conversion. However, solar energy resources are intermittent and volatile, and heating systems that rely solely on solar energy still lack stability in energy supply. Therefore, coupled heating systems that combine multiple heat sources, such as air-source heat pumps and water-source heat pumps, can achieve a more stable energy supply. However, the design of existing multi-source heat pump systems still has technical bottlenecks in terms of heat source switching efficiency and heat energy transfer losses. Especially in cold weather conditions, how to achieve efficient utilization and switching of heat sources remains a technical challenge. Summary of the Invention

[0004] The purpose of the present invention is to provide a new solar-coupled air-water dual-source heat pump system based on thermal diodes, which solves the defects of low switching efficiency and large heat loss in existing multi-source heat pump systems during heating.

[0005] In order to achieve the above object, the technical solution adopted in the present invention is:

[0006] The present invention provides a novel solar-coupled air-water dual-source heat pump system based on a thermal diode, comprising a solar PVT panel, a thermal diode, an air preheater, an air-water dual-source heat pump evaporator, and an air-water dual-source heat pump condenser, wherein:

[0007] The heat pump working medium outlet of the air-water dual-source heat pump condenser is divided into two paths, one path is connected to the heat pump working medium inlet of the thermal diode, and the other path is connected to the heat pump working medium inlet of the air-water dual-source heat pump evaporator; the heat pump working medium outlet of the thermal diode and the heat pump working medium outlet of the air-water dual-source heat pump evaporator are both connected to the heat pump working medium inlet of the air-water dual-source heat pump condenser;

[0008] The water supply circulating water inlet of the air-water dual-source heat pump condenser is connected to the heat network return water pipeline, and the water supply circulating water outlet of the air-water dual-source heat pump condenser is connected to the heat network water supply pipeline;

[0009] The water source inlet of the thermal diode is connected to the hot water outlet of the solar PVT panel, and the water source outlet of the thermal diode is connected to the hot water inlet of the solar PVT panel;

[0010] The air-water dual-source heat pump evaporator includes an air source evaporator and a water source evaporator, wherein the inlet of the air source evaporator is connected to an air preheater; the water working medium inlet of the water source evaporator is connected to the water source outlet of the thermal diode, and the water working medium outlet of the water source evaporator is connected to the water source inlet of the thermal diode.

[0011] Preferably, the thermal diode includes an evaporation section and a condensation section, wherein the evaporation section is provided with a water source inlet, a water source outlet, a thermal diode working medium inlet, and a thermal diode working medium outlet, the water source inlet is respectively connected to the hot water outlet of the solar PVT panel and the water working medium outlet of the water source evaporator, and the water source outlet is respectively connected to the hot water inlet of the solar PVT panel and the water working medium inlet of the water source evaporator;

[0012] The condensing section is provided with a heat pump working fluid inlet, a heat pump working fluid outlet, a thermal diode working fluid inlet and a thermal diode working fluid outlet. The heat pump working fluid inlet and outlet are respectively connected to the heat pump working fluid outlet and inlet of the air-water dual-source heat pump condenser; the thermal diode working fluid inlet and outlet are respectively connected to the thermal diode working fluid outlet and inlet on the evaporating section.

[0013] Preferably, a first water pump is provided between the hot water outlet of the solar PVT panel and the water source inlet of the thermal diode.

[0014] Preferably, a second water pump and a third valve are provided between the water source outlet of the thermal diode and the water working medium inlet of the water source evaporator.

[0015] Preferably, the thermal diode and the heat pump working medium outlet of the air-water dual-source heat pump evaporator are connected to the heat pump working medium inlet of the air-water dual-source heat pump condenser through a second three-way valve.

[0016] Preferably, a second valve is provided on the connecting pipeline between the thermal diode and the second three-way valve; and a fifth valve is provided on the connecting pipeline between the air-water dual-source heat pump evaporator and the second three-way valve.

[0017] Preferably, a compressor is provided on the connecting pipeline between the second three-way valve and the air-water dual-source heat pump condenser.

[0018] Preferably, an electronic expansion valve is provided on the connecting pipe between the air-water dual-source heat pump condenser and the thermal diode.

[0019] Preferably, the electronic expansion valve is connected to the thermal diode and the air-water dual-source heat pump evaporator respectively through a first three-way valve; a first valve is provided on the connecting pipeline between the first three-way valve and the thermal diode; and a fourth valve is provided on the connecting pipeline between the first three-way valve and the air-water dual-source heat pump evaporator.

[0020] A method for operating a novel solar-coupled air-water dual-source heat pump system based on a thermal diode includes the following modes:

[0021] Mode 1: Sunny and non-severely cold weather

[0022] The water source evaporator does not work, and the heat pump working fluid is divided into two parts, one part of the heat pump working fluid is heated by solar energy; the other part of the heat pump working fluid is heated by air source;

[0023] Afterwards, the two parts of the heat pump working fluid are mixed and pressurized, and heat exchange is carried out with the heating return water to provide heat;

[0024] Mode 2: Cold and cloudy weather

[0025] The thermal diode and air source evaporator do not work, and the water source is heated by solar energy. Then the low-temperature hot water source and the heat pump working fluid are heat-exchanged in the water source evaporator. The heated heat pump working fluid is pressurized and then heat-exchanged with the heating return water to provide heat.

[0026] Mode 3: Cold and cloudy weather, and the temperature of the hot water source is lower than the preset threshold

[0027] The solar PVT panels, thermal diodes and water source evaporator are all inoperative. The air is preheated by the air preheater, and the preheated air is used to heat the heat pump working fluid in the air source evaporator. The heated heat pump working fluid is pressurized and then heat-exchanged with the heating return water to provide heat.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] This invention provides a novel solar-coupled air-water dual-source heat pump system based on thermal diodes. By introducing efficient one-way heat transfer and flexibly switching between air-source and water-source heat pump operation modes, the system significantly improves heating efficiency and adaptability. Designed as a heat transfer medium, the system effectively reduces heat loss and achieves efficient heating, cooling, and power support through multi-energy synergy, providing an innovative solution for renewable energy heating systems.

[0030] To sum up, the energy utilization efficiency is significantly improved: the present invention makes full use of solar energy and environmental thermal energy, realizes efficient heat transfer through thermal diodes, reduces energy loss, and realizes cascade utilization of energy; the operating mode is flexible and adjustable: the system can switch freely between air source and water source modes according to external climatic conditions, adapt to the heating needs under different climatic conditions, and improve the system operation stability and user experience; the structural design is reasonable and the operating cost is low: gravity-type thermal diodes are used to realize unidirectional heat transfer, which reduces the energy consumption of additional heat transfer devices and reduces the noise and maintenance costs during system operation; wide applicability: the heating system of the present invention is particularly suitable for operation under complex and changeable climatic conditions, and can be widely used in heating in cold areas, industrial and agricultural hot water supply and other fields; therefore, the present invention not only effectively improves the energy efficiency level and operation stability of the heating system, but also provides an efficient and economical solution for the coupled application of solar energy and heat pump technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the system of the present invention;

[0032] Among them, there are solar PVT panel 1, battery 2, evaporation section 3, thermal diode 4, condensing section 5, electronic expansion valve 6, air preheater 7, air-water dual-source heat pump evaporator 8, compressor 9, air-water dual-source heat pump condenser 10, first water pump 11, second water pump 12, first three-way valve 13, second three-way valve 14, first valve 15, second valve 16, third valve 17, fourth valve 18, and fifth valve 19. DETAILED DESCRIPTION

[0033] In the following description, specific details such as specific system structures and technologies are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, and circuits are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0034] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0035] It will also be understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0036] As used in this specification and the appended claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0037] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0038] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0039] Example 1

[0040] refer to Figure 1 This embodiment provides a novel solar-coupled air-water dual-source heat pump system based on a thermal diode, comprising a solar PVT panel 1, a battery 2, an evaporation section 3, a thermal diode 4, a condensation section 5, an electronic expansion valve 6, an air preheater 7, an air-water dual-source heat pump evaporator 8, a compressor 9, an air-water dual-source heat pump condenser 10, a first water pump 11, a second water pump 12, a first three-way valve 13, a second three-way valve 14, a first valve 15, a second valve 16, a third valve 17, a fourth valve 18, and a fifth valve 19, wherein:

[0041] The power output end of the solar PVT panel 1 is connected to the input end of the battery 2, and the power output end of the battery 2 is connected to the power input end of the first water pump 11, the power input end of the second water pump 12, the power input end of the air preheater 7 and the power input end of the compressor 9 and or incorporated into the power grid to supply power to users.

[0042] The air preheater 7 is arranged before the air-water dual-source heat pump evaporator 8, and the air enters the air-water dual-source heat pump evaporator 8 after being preheated by the outdoor air.

[0043] The hot water outlet of the solar PVT panel 1 is connected to the inlet of the first water pump 11, and the outlet of the first water pump 11 is connected to the water source inlet of the evaporation section 3 of the gravity thermal diode 4, transferring heat to the thermal diode working medium or the hot water source serving as the water source evaporator. The water source outlet of the evaporation section 3 is connected to the hot water inlet of the solar PVT panel 1, and the hot water returns to the solar PVT panel 1 to continue to heat up, thereby realizing circulation.

[0044] The thermal diode working medium outlet end of the evaporation section 3 is connected to the thermal diode working medium inlet end of the condensation section 5 of the thermal diode 4, exchanges heat with the heat pump working medium, and transfers heat to the heat pump working medium. The thermal diode working medium outlet end of the condensation section 5 is connected to the thermal diode working medium inlet end of the evaporation section 3, thereby realizing the thermal diode working medium circulation of the thermal diode 4.

[0045] The water source outlet end of the evaporation section 3 is connected to the inlet of the second water pump 12, and the outlet of the second water pump 12 is connected to the inlet of the third valve 17; the outlet of the third valve 17 is connected to the water working medium inlet of the water source evaporator in the air-water dual-source heat pump evaporator 8, and the water working medium outlet end of the water source evaporator in the air-water dual-source heat pump evaporator 8 is connected to the water source inlet of the evaporation section 3; thereby realizing the circulation of hot water.

[0046] The heat pump working medium inlet of the condensing section 5 is connected to the outlet of the first valve 15, which is connected to one outlet of the first three-way valve 13. The other outlet of the first three-way valve 13 is connected to the inlet of the fourth valve 18. The outlet of the fourth valve 18 is connected to the heat pump working medium inlet of the air-water dual-source heat pump evaporator 8. The heat pump working medium outlet of the air-water dual-source heat pump evaporator 8 is connected to the inlet of the fifth valve 19. The outlet of the fifth valve 19 is connected to one inlet of the second three-way valve 14. The heat pump working medium output end of the condensing section 5 is connected to the inlet of the first valve 16, which is connected to the other inlet of the second three-way valve 14. The outlet of the second three-way valve 14 is connected to the inlet of the compressor 9, which is connected to the heat pump inlet of the air-water dual-source heat pump condenser 10. The heat pump outlet of the air-water dual-source heat pump condenser 10 is connected to the inlet of the electronic expansion valve 6, which is connected to the inlet of the first three-way valve 13.

[0047] The heat output end of the air-water dual-source heat pump condenser 10 is connected to the heat user's heating system.

[0048] In this embodiment, the heat network circulating water exchanges heat with the heat pump working fluid in the air-water dual-source heat pump condenser 10. A part of the heat pump working fluid after cooling enters the thermal diode and exchanges heat with the hot water from the solar PVT panel. The heated heat pump working fluid enters the compressor 9, and the cooled hot water returns to the solar PVT panel for heating and temperature increase. Another part of the heat pump working fluid enters the air-water dual-source heat pump evaporator 8 and is heated and heated by the air source or water source. The heated heat pump working fluid is mixed and pressurized with the heat pump working fluid output from the thermal diode in the compressor 9. The cooled air source is discharged, or the cooled water source returns to the solar PVT panel for heating and temperature increase. The heated and pressurized heat pump working fluid enters the air-water dual-source heat pump condenser 10 to continue to exchange heat with the heat network circulating water.

[0049] This embodiment significantly improves the system's heating efficiency and adaptability by introducing efficient one-way heat transfer and flexibly switching between air-source and water-source heat pumps. Designed as a heat transfer medium, the system effectively reduces heat loss and achieves efficient heating, cooling, and power support through multi-energy synergy, providing an innovative solution for renewable energy heating systems.

[0050] Example 2

[0051] This embodiment, based on the system described in Example 1, provides an operating method for a novel solar-coupled air-water dual-source heat pump system based on thermal diodes. The system can operate in three modes depending on external weather conditions:

[0052] Mode 1: Sunny and non-cold weather (in this embodiment, the outdoor temperature is above 0°C and the solar radiation is 800W / m 2 Around, using air source to heat the heat pump working fluid)

[0053] The air source evaporator in the air-water dual-source heat pump evaporator 8 is activated, the first valve 15 , the second valve 16 , the fourth valve 18 and the fifth valve 19 are opened, and the third valve 17 is closed.

[0054] Heat pump working fluid diversion and heat exchange: The heat pump working fluid is divided into two parts by the first three-way valve 13. The first part flows through the first valve 15 and enters the condensing section 5 for heat exchange and temperature rise, and high-temperature hot water is used to heat the heat pump working fluid. The second part flows through the fourth valve 18 and exchanges heat with the outdoor air in the air source evaporator for temperature rise.

[0055] Combining and boosting the heat pump working fluid: The two parts of heated heat pump working fluid are mixed at the second three-way valve 14 and then enter the compressor 9 for boosting the pressure and temperature.

[0056] Heating and circulation: The high-temperature heat pump working fluid transfers heat to the heat user through the air-water dual-source heat pump condenser 10, and after cooling, it is reduced in pressure by the electronic expansion valve 6 and returns to the first three-way valve 13 to complete the cycle.

[0057] Mode 2: Cold and cloudy weather (in this embodiment, the solar radiation intensity is less than 200W / m 2 , solar radiation duration is greater than 36 hours, outdoor temperature is below 0℃, and water source is used to heat the heat pump working fluid)

[0058] Switch to the water source evaporator in the air-water dual-source heat pump evaporator, close the first valve 15 and the second valve 16, and open the third valve 17, the fourth valve 18 and the fifth valve 19.

[0059] Water source heat pump heat exchange: The evaporation section 3 provides low-temperature hot water, which is pressurized by the first water pump 12 and flows into the water source evaporator in the air-water dual-source heat pump evaporator 8, exchanging heat with the heat pump working medium to increase the temperature.

[0060] Heat pump working fluid pressure boosting and heat supply: The heated heat pump working fluid enters the second three-way valve 14 through the fifth valve 19, is connected to the compressor 9, and after pressure boosting and temperature increase, it supplies heat to heat users through the air-water dual-source heat pump condenser 10.

[0061] Circulation: After the heat pump working fluid releases heat through condensation, it is reduced in pressure through the electronic expansion valve 6 and returns to the first three-way valve 13 to repeat the cycle.

[0062] Mode 3: Special conditions (in this embodiment, the solar radiation intensity is less than 200W / m 2 , solar radiation duration is less than or equal to 36 hours, outdoor temperature is below 0℃, and air source is used to heat the heat pump working fluid)

[0063] Under special conditions (such as when the water temperature in the thermal diode 4 cannot be directly heated or used as a low-temperature heat source), the air preheater 7 is activated:

[0064] The air source evaporator in the air-water dual-source heat pump evaporator 8 is activated, the first valve 15 , the second valve 16 , and the third valve 17 are closed, and the fourth valve 18 and the fifth valve 19 are opened.

[0065] Heat exchange of heat pump working medium: After passing through the first three-way valve 13, the heat pump working medium flows through the fourth valve 18 and exchanges heat with the preheated outdoor air in the air source evaporator of the air-water dual-source heat pump evaporator 8 to increase its temperature.

[0066] Heat pump working fluid pressure boosting and heat supply: The heated heat pump working fluid enters the second three-way valve 14 through the fifth valve 19, is connected to the compressor 9, and after pressure boosting and temperature increase, it supplies heat to heat users through the air-water dual-source heat pump condenser 10.

[0067] Circulation: After the heat pump working fluid releases heat through condensation, it is reduced in pressure through the electronic expansion valve 6 and returns to the first three-way valve 13 to repeat the cycle.

[0068] Utilize grid power or battery power to heat outdoor air and increase the inlet temperature of the air source evaporator, thereby improving system energy efficiency.

[0069] This embodiment makes full use of solar energy and ambient thermal energy, realizes efficient heat transfer through thermal diodes, reduces energy loss, and realizes cascade utilization of energy; it can freely switch between air source and water source modes according to external climatic conditions, adapt to heating needs under different climatic conditions, and improve system operation stability and user experience; it uses gravity-type structured thermal diodes to realize unidirectional heat transfer, reduces the energy consumption of additional heat transfer devices, and reduces noise and maintenance costs during system operation; the heating system involved in this embodiment is particularly suitable for operation under complex and changeable climatic conditions, and can be widely used in heating in cold areas, industrial and agricultural hot water supply and other fields; thus, this application not only effectively improves the energy efficiency level and operation stability of the heating system, but also provides an efficient and economical solution for the coupled application of solar energy and heat pump technology.

[0070] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A new solar-coupled air-water dual-source heat pump system based on thermal diodes, characterized in that: It includes solar PVT panels, thermal diodes, air preheater, air-water dual-source heat pump evaporator and air-water dual-source heat pump condenser, among which: The heat pump working medium outlet of the air-water dual-source heat pump condenser is divided into two paths, one path is connected to the heat pump working medium inlet of the thermal diode, and the other path is connected to the heat pump working medium inlet of the air-water dual-source heat pump evaporator; the heat pump working medium outlet of the thermal diode and the heat pump working medium outlet of the air-water dual-source heat pump evaporator are both connected to the heat pump working medium inlet of the air-water dual-source heat pump condenser; The water supply circulating water inlet of the air-water dual-source heat pump condenser is connected to the heat network return water pipeline, and the water supply circulating water outlet of the air-water dual-source heat pump condenser is connected to the heat network water supply pipeline; The water source inlet of the thermal diode is connected to the hot water outlet of the solar PVT panel, and the water source outlet of the thermal diode is connected to the hot water inlet of the solar PVT panel; The air-water dual-source heat pump evaporator includes an air source evaporator and a water source evaporator, wherein the air source evaporator inlet is connected to an air preheater; the water working medium inlet of the water source evaporator is connected to the water source outlet of the thermal diode, and the water working medium outlet of the water source evaporator is connected to the water source inlet of the thermal diode; the thermal diode includes an evaporation section and a condensation section, wherein the evaporation section is provided with a water source inlet, a water source outlet, a thermal diode working medium inlet and a thermal diode working medium outlet, the water source inlet is respectively connected to the hot water outlet of the solar PVT panel and the water working medium outlet of the water source evaporator, and the water source outlet is respectively connected to the hot water inlet of the solar PVT panel and the water working medium inlet of the water source evaporator; The condensing section is provided with a heat pump working medium inlet, a heat pump working medium outlet, a thermal diode working medium inlet and a thermal diode working medium outlet. The heat pump working medium inlet and outlet are respectively connected to the heat pump working medium inlet and inlet of the air-water dual-source heat pump condenser; the thermal diode working medium inlet and outlet are respectively connected to the thermal diode working medium inlet and inlet on the evaporating section; The system's operating methods include the following modes: Mode 1: Sunny and non-severely cold weather When the water source evaporator does not work, the heat pump working fluid is divided into two parts. One part of the heat pump working fluid enters the condensing section for heat exchange and temperature increase, and the high-temperature hot water heated by solar energy is used to heat the heat pump working fluid; the other part of the heat pump working fluid is heated by the air source; Afterwards, the two parts of the heat pump working fluid are mixed and pressurized, and heat exchange is carried out with the heating return water to provide heat; Mode 2: Cold and cloudy weather The thermal diode and air source evaporator do not work, and the water source is heated by solar energy. Then the low-temperature hot water source and the heat pump working fluid are heat-exchanged in the water source evaporator. The heated heat pump working fluid is pressurized and then heat-exchanged with the heating return water to provide heat. Mode 3: Cold and cloudy weather, and the temperature of the hot water source is lower than the preset threshold The solar PVT panels, thermal diodes and water source evaporator are all inoperative, and the air preheater is used to preheat the air. The preheated air is used to heat the heat pump working fluid in the air source evaporator, and the heated heat pump working fluid is pressurized and then heat-exchanged with the heating return water to provide heat.

2. A novel solar-coupled air-water dual-source heat pump system based on thermal diodes according to claim 1, characterized in that: A first water pump is provided between the hot water outlet of the solar PVT panel and the water source inlet of the thermal diode.

3. A novel solar-coupled air-water dual-source heat pump system based on thermal diodes according to claim 1, characterized in that: A second water pump and a third valve are provided between the water source outlet of the thermal diode and the water working medium inlet of the water source evaporator.

4. A novel solar-coupled air-water dual-source heat pump system based on thermal diodes according to claim 1, characterized in that: The thermal diode and the heat pump working medium outlet of the air-water dual-source heat pump evaporator are connected to the heat pump working medium inlet of the air-water dual-source heat pump condenser through a second three-way valve.

5. A novel solar-coupled air-water dual-source heat pump system based on thermal diodes according to claim 4, characterized in that: A second valve is provided on the connecting pipeline between the thermal diode and the second three-way valve; and a fifth valve is provided on the connecting pipeline between the air-water dual-source heat pump evaporator and the second three-way valve.

6. A novel solar-coupled air-water dual-source heat pump system based on thermal diodes according to claim 4, characterized in that: A compressor is provided on the connecting pipeline between the second three-way valve and the air-water dual-source heat pump condenser.

7. A novel solar-coupled air-water dual-source heat pump system based on thermal diodes according to claim 1, characterized in that: An electronic expansion valve is provided on the connecting pipe between the air-water dual-source heat pump condenser and the thermal diode.

8. A novel solar-coupled air-water dual-source heat pump system based on thermal diodes according to claim 7, characterized in that: The electronic expansion valve is connected to the thermal diode and the air-water dual-source heat pump evaporator respectively through a first three-way valve; a first valve is provided on the connecting pipeline between the first three-way valve and the thermal diode; a fourth valve is provided on the connecting pipeline between the first three-way valve and the air-water dual-source heat pump evaporator.

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