Solar energy and heat pump water supply system

Abstract

The utility model belongs to the technical field of solar photovoltaic heat, and discloses a solar energy and heat pump water supply system, which can adopt a PVT photovoltaic module to meet the heat energy required for preparing hot water under the condition of better illumination in daytime. When the heat energy needed for preparing hot water is large, especially at night, the heat of the PVT photovoltaic module cannot meet the heat energy requirement for preparing the hot water, at the moment, the PVT photovoltaic module can be replaced by the air heat exchanger, and the air heat exchanger absorbs heat from air to meet the heat energy requirement for preparing the hot water.

Description

Technical Field

[0001] The utility model relates to the technical field of solar photovoltaic heat, in particular to a solar energy and heat pump water supply system. Background Art

[0002] The PVT heat pump system includes a heat pump device and a PVT photovoltaic module. The heat pump device is a high-efficiency energy-saving device that fully utilizes low-level thermal energy. The working principle of the heat pump device is a mechanical device that forces heat from a low-temperature object to a high-temperature object in a reverse cycle. The PVT photovoltaic module is a structure that integrates photovoltaic power generation and solar thermal collection functions.

[0003] The heat pump device absorbs heat from the PVT photovoltaic module and releases heat to prepare hot water. The prepared hot water can be used as domestic hot water or heating hot water. If the heat of the PVT photovoltaic module is insufficient at night, the domestic hot water or heating hot water will not be able to meet the usage needs. Utility Model Content

[0004] The technical problem solved by the utility model is to provide a solar energy and heat pump water supply system, which can provide heat energy for preparing domestic hot water or heating hot water by selecting either a PVT photovoltaic component or an air heat exchanger.

[0005] The above technical problems are solved by the following technical solutions:

[0006] A solar energy and heat pump water supply system comprises a compressor, a four-way reversing valve, a first water source heat exchanger, an expansion valve and an air heat exchanger which are connected in series to form a heat exchange circulation loop; the solar energy and heat pump water supply system also comprises:

[0007] A PVT photovoltaic assembly, wherein the PVT photovoltaic assembly is arranged in parallel with the air heat exchanger;

[0008] The first valve group can connect any one of the PVT photovoltaic assembly and the air heat exchanger in series to the heat exchange circulation loop between the four-way reversing valve and the expansion valve.

[0009] Compared with the background technology, the solar energy and heat pump water supply system provided by the utility model has the following beneficial effects: when the sunlight is good during the day, PVT photovoltaic modules can be used to meet the thermal energy required for preparing hot water; when the thermal energy required for preparing hot water is large, especially at night, the heat of the PVT photovoltaic modules will not be able to meet the thermal energy demand for hot water preparation. At this time, the PVT photovoltaic modules can be replaced with air heat exchangers, which absorb heat from the air to meet the thermal energy demand for hot water preparation.

[0010] In some embodiments, the solar energy and heat pump water supply system further includes a second water source heat exchanger, which is connected in series to the heat exchange circulation loop between the outlet of the compressor and the four-way reversing valve.

[0011] In some embodiments, the solar energy and heat pump water supply system also includes a domestic hot water storage tank and a heat exchange storage tank. The second water source heat exchanger is used to exchange heat for the water in the domestic hot water storage tank, and the first water source heat exchanger is used to exchange heat for the water in the heat exchange storage tank.

[0012] In some embodiments, the solar energy and heat pump water supply system further comprises:

[0013] A bypass pipeline, wherein the bypass pipeline and the second water source heat exchanger are arranged in parallel;

[0014] The second valve group is used to selectively connect the outlet of the compressor to the second water source heat exchanger or to the bypass pipeline.

[0015] In some embodiments, the first valve group is a three-way valve, or the first valve group includes a switch valve 1 and a switch valve 2, the expansion valve is connected to the air heat exchanger through the switch valve 1, and the expansion valve is connected to the first end of the PVT photovoltaic module through the switch valve 2;

[0016] And / or, the second valve group is a three-way valve, or the second valve group includes switch valve three and switch valve four, the outlet of the compressor is connected to the second water source heat exchanger through switch valve three, and the switch valve four is arranged on the bypass pipeline.

[0017] In some embodiments, the four-way reversing valve is connected to the first water source heat exchanger through a first pipeline, and the four-way reversing valve is connected to the air heat exchanger through a second pipeline;

[0018] The solar energy and heat pump water supply system also includes a third valve group, the first end of the PVT photovoltaic component is connected to the first valve group, and the third valve group is used to connect the second end of the PVT photovoltaic component to at least one of the first pipeline and the second pipeline.

[0019] In some embodiments, the first pipeline includes a pipeline 1 connected to the four-way reversing valve, and a pipeline 2 connected to the first water source heat exchanger;

[0020] The solar energy and heat pump water supply system further includes a fourth valve group, which is used to selectively connect the second pipeline with at least one of the first end of the PVT photovoltaic assembly and the first pipeline.

[0021] In some embodiments, the third valve group is a three-way valve, or the third valve group includes a first switch valve and a second switch valve, the second end of the PVT photovoltaic assembly is connected to the first pipeline through the first switch valve, and the second end of the PVT photovoltaic assembly is connected to the second pipeline through the second switch valve;

[0022] And / or, the fourth valve group is a three-way valve, or the fourth valve group includes a switch valve five and a switch valve six, the pipeline two is connected to the first end of the PVT photovoltaic component through the switch valve five, and the pipeline two is connected to the pipeline one through the switch valve six.

[0023] In some embodiments, a balancing tank is provided on the heat exchange circulation loop between the expansion valve and the first water source heat exchanger.

[0024] In some embodiments, a gas-liquid separator is provided on the heat exchange circulation loop between the four-way reversing valve and the inlet of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of a solar energy and heat pump water supply system provided by an embodiment of the utility model;

[0026] Figure 2 It is a refrigerant flow circuit diagram when the solar energy and heat pump water supply system provided by the embodiment of the utility model works in the first working mode;

[0027] Figure 3 It is a refrigerant flow circuit diagram when the solar energy and heat pump water supply system provided by the embodiment of the utility model works in the second working mode;

[0028] Figure 4 It is a refrigerant flow circuit diagram when the solar energy and heat pump water supply system provided by the embodiment of the utility model works in the third working mode;

[0029] Figure 5 It is a refrigerant flow circuit diagram when the solar energy and heat pump water supply system provided by the embodiment of the utility model works in the fourth working mode;

[0030] Figure 6 It is a refrigerant flow circuit diagram when the solar energy and heat pump water supply system provided by the embodiment of the utility model works in the fifth working mode;

[0031] Figure 7 It is a refrigerant flow circuit diagram when the solar energy and heat pump water supply system provided by the embodiment of the utility model works in the sixth working mode;

[0032] Figure 8It is a refrigerant flow circuit diagram when the solar energy and heat pump water supply system provided by the embodiment of the utility model works in the seventh working mode;

[0033] Fig. 9 It is a refrigerant flow circuit diagram when the solar energy and heat pump water supply system provided by the embodiment of the utility model works in the eighth working mode;

[0034] Fig.10 It is a refrigerant flow circuit diagram when the solar energy and heat pump water supply system provided by the embodiment of the utility model works in the ninth working mode.

[0035] In the figure:

[0036] 1. Compressor; 2. Second valve group; 3. Second water source heat exchanger; 4. Four-way reversing valve; 5. Fourth valve group; 6. First water source heat exchanger; 7. Balance tank; 8. Expansion valve; 9. First valve group; 10. Air heat exchanger; 11. First switch valve; 12. Second switch valve; 13. PVT photovoltaic module; 14. Domestic hot water storage tank; 15. Heat exchange storage tank; 16. Gas-liquid separator; 17. First water pump; 18. Second water pump; 19. Inverter; 20. Bypass pipeline; 30. First pipeline; 301. Pipeline 1; 302. Pipeline 2; 40. Second pipeline; 50. Third valve group. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0041] like Figure 1 As shown, this embodiment provides a solar energy and heat pump water supply system, including a compressor 1, a four-way reversing valve 4, a first water source heat exchanger 6, an expansion valve 8, and an air heat exchanger 10, which are sequentially connected in series to form a heat exchange circulation loop. It should be noted that the air heat exchanger 10 is an outdoor air heat exchanger and is equipped with a fan for forced convection.

[0042] The solar energy and heat pump water supply system also includes a PVT photovoltaic component 13 and a first valve group 9, wherein the PVT photovoltaic component 13 and the air heat exchanger 10 are arranged in parallel, and the first valve group 9 can connect any one of the PVT photovoltaic component 13 and the air heat exchanger 10 in series to the heat exchange circulation loop between the four-way reversing valve 4 and the expansion valve 8.

[0043] When the sunlight is good during the day, the PVT photovoltaic module 13 can be used to meet the thermal energy required for preparing hot water; when the thermal energy required for preparing hot water is large, especially at night, the heat of the PVT photovoltaic module 13 will not be able to meet the thermal energy demand for hot water preparation. At this time, the PVT photovoltaic module 13 can be replaced with an air heat exchanger 10, and the air heat exchanger 10 absorbs heat from the air to meet the thermal energy demand for hot water preparation.

[0044] In some embodiments, the solar energy and heat pump water supply system further includes a second water source heat exchanger 3 , which is connected in series to a heat exchange circulation loop between the outlet of the compressor 1 and the four-way reversing valve 4 .

[0045] The solar energy and heat pump water supply system also includes a domestic hot water storage tank 14 and a heat exchange storage tank 15 . The second water source heat exchanger 3 is used to exchange heat for the water in the domestic hot water storage tank 14 , and the first water source heat exchanger 6 is used to exchange heat for the water in the heat exchange storage tank 15 .

[0046] For ease of understanding, the inlet of the four-way reversing valve 4 is recorded as port D, and the other three medium ports of the four-way reversing valve 4 are recorded as port C, port E and port S. The four-way reversing valve 4 has a heating state and a cooling state. When the four-way reversing valve 4 is in the heating state, port D is connected to port C and port E is connected to port S; when the four-way reversing valve 4 is in the cooling state, port D is connected to port E and port C is connected to port S.

[0047] Among them, port D is connected to the outlet of compressor 1 through the second water source heat exchanger 3, port C is connected to the first water source heat exchanger 6 through the first pipeline 30, the air heat exchanger 10 is connected to port E through the second pipeline 40, and port S is connected to the inlet of compressor 1.

[0048] In some embodiments, the solar energy and heat pump water supply system also includes a bypass pipe 20 and a second valve group 2, wherein the bypass pipe 20 and the second water source heat exchanger 3 are arranged in parallel, and the second valve group 2 is used to selectively connect the outlet of the compressor 1 to the second water source heat exchanger 3, or to the bypass pipe 20.

[0049] When the second water source heat exchanger 3 is needed to heat the water in the domestic hot water storage tank 14, the second valve group 2 is controlled to connect the outlet of the compressor 1 with the second water source heat exchanger 3; when the second water source heat exchanger 3 is not needed to heat the water in the domestic hot water storage tank 14, the second valve group 2 is controlled to connect the outlet of the compressor 1 with the D port through the bypass pipe 20.

[0050] In some embodiments, the second valve group 2 is a three-way solenoid valve. In other embodiments, the second valve group 2 may also use two solenoid switch valves. Specifically, the second valve group 2 includes a switch valve 3 and a switch valve 4. The outlet of the compressor 1 is connected to the second water source heat exchanger 3 through the switch valve 3, and the switch valve 4 is arranged on the bypass pipeline 20. Through the second valve group 2, the switch valve 3 can be opened to connect the outlet of the compressor 1 to the D port through the bypass pipeline 20, and the switch valve 4 can also be opened to connect the outlet of the compressor 1 to the D port through the second water source heat exchanger 3.

[0051] In some embodiments, the first valve group 9 is connected to the heat exchange circulation loop between the expansion valve 8 and the air heat exchanger 10, and the first valve group 9 can selectively connect the expansion valve 8 to any one of the air heat exchanger 10 and the PVT photovoltaic assembly 13. Exemplarily, the first valve group 9 is a three-way solenoid valve, through which the expansion valve 8 can be connected to the E port of the four-way reversing valve 4 through the air heat exchanger 10, and the expansion valve 8 can also be connected to the E port of the four-way reversing valve 4 through the PVT photovoltaic assembly 13. In other embodiments, the first valve group 9 can also use two electromagnetic switch valves, specifically, the first valve group 9 includes a switch valve 1 and a switch valve 2, the expansion valve 8 is connected to the air heat exchanger 10 through the switch valve 1, and the expansion valve 8 is connected to the first end of the PVT photovoltaic assembly 13 through the switch valve 2.

[0052] In some embodiments, the four-way reversing valve 4 is connected to the first water source heat exchanger 6 through the first pipeline 30, and the four-way reversing valve 4 is connected to the air heat exchanger 10 through the second pipeline 40; the solar energy and heat pump water supply system also includes a third valve group 50, the first end of the PVT photovoltaic component 13 is connected to the first valve group 9, and the third valve group 50 is used to connect the second end of the PVT photovoltaic component 13 to at least one of the first pipeline 30 and the second pipeline 40.

[0053] Exemplarily, the third valve group 50 includes a first switch valve 11 and a second switch valve 12, both of which are electromagnetic switch valves, the pipeline 1 301 is connected to the C port of the four-way reversing valve 4, the second end of the PVT photovoltaic component 13 is connected to the pipeline 1 301 through the first switch valve 11, and the second end of the PVT photovoltaic component 13 is connected to the second pipeline 40 through the second switch valve 12. In other embodiments, the third valve group 50 can also use a three-way electromagnetic valve.

[0054] When the first switch valve 11 is opened and the second switch valve 12 is closed, and the first valve group 9 connects the expansion valve 8 and the PVT photovoltaic assembly 13, the air heat exchanger 10 and the PVT photovoltaic assembly 13 can be connected in series.

[0055] When the first switch valve 11 and the second switch valve 12 are closed, and the first valve group 9 connects the expansion valve 8 and the air heat exchanger 10, the air heat exchanger 10 and the first water source heat exchanger 6 can be connected in series without using the PVT photovoltaic assembly 13.

[0056] When the first switch valve 11 is closed and the second switch valve 12 is opened, and the first valve group 9 connects the expansion valve 8 and the first end of the PVT photovoltaic component 13, the PVT photovoltaic component 13 and the first water source heat exchanger 6 can be connected in series without using the air heat exchanger 10.

[0057] In some embodiments, the first pipeline 30 includes a pipeline 1 301 connected to the four-way reversing valve 4, and a pipeline 2 302 connected to the first water source heat exchanger 6, and the solar energy and heat pump water supply system also includes a fourth valve group 5, and the fourth valve group 5 is used to selectively connect pipeline 2 302 to the first end of the PVT photovoltaic component 13 and at least one of pipeline 1 301.

[0058] Exemplarily, the fourth valve group 5 is a three-way solenoid valve, through which the first water source heat exchanger 6 and the first end of the PVT photovoltaic assembly 13 can be connected, and the first water source heat exchanger 6 and the C port of the four-way reversing valve 4 can also be directly connected. In other embodiments, the fourth valve group 5 can also use two electromagnetic switch valves, specifically, the fourth valve group 5 includes a switch valve five and a switch valve six, the pipeline 2 302 is connected to the first end of the PVT photovoltaic assembly 13 through the switch valve five, and the pipeline 2 302 is connected to the pipeline 1 301 through the switch valve six.

[0059] When the first switch valve 11 is opened and the second switch valve 12 is closed, and the fourth valve group 5 connects the pipeline 2 302 with the first end of the PVT photovoltaic component 13, and the first valve group 9 connects the expansion valve 8 and the air heat exchanger 10, the PVT photovoltaic component 13, the first water source heat exchanger 6 and the air heat exchanger 10 can be connected in series in sequence.

[0060] In some embodiments, a balancing tank 7 is provided on the heat exchange circulation loop between the expansion valve 8 and the first water source heat exchanger 6. The balancing tank 7 can alleviate the pressure fluctuation of the system.

[0061] In some embodiments, a gas-liquid separator 16 is provided on the heat exchange circulation loop between the S port of the four-way reversing valve 4 and the inlet of the compressor 1. The gas-liquid separator 16 is used to separate gas and liquid to prevent liquid from entering the compressor 1 and affecting the operation of the compressor 1.

[0062] In some embodiments, the solar energy and heat pump water supply system further includes an inverter 19, which is electrically connected to the photovoltaic cells of the PVT photovoltaic assembly 13. When the PVT photovoltaic assembly 13 is working, it can generate electricity and store electrical energy in the photovoltaic cells, and the inverter 19 can convert the direct current of the photovoltaic cells into alternating current to supply electrical equipment, such as the compressor 1 and various solenoid valves of the solar energy and heat pump water supply system.

[0063] In some embodiments, the expansion valve 8 is an electronic expansion valve, a thermal expansion valve, or a capillary tube. Exemplarily, the expansion valve 8 is an electronic expansion valve.

[0064] In some embodiments, the compressor 1 is any one of a scroll compressor, a rotor compressor, a screw compressor, and a piston compressor.

[0065] In some embodiments, a first heat exchange pipe is provided in the heat exchange water storage tank 15, and both ends of the first heat exchange pipe are connected to the first water source heat exchanger 6 through a pipeline to form a first heat exchange loop, and a first water pump 17 is provided on the first heat exchange loop. The first water pump 17 circulates the water in the first heat exchange loop to heat the water in the heat exchange water storage tank 15.

[0066] In some embodiments, a second heat exchange pipe is provided in the domestic hot water storage tank 14, and both ends of the second heat exchange pipe are connected to the second water source heat exchanger 3 through a pipeline to form a second heat exchange loop, and a second water pump 18 is provided on the second heat exchange loop. The second water pump 18 circulates the water in the second heat exchange loop to heat the water in the domestic hot water storage tank 14.

[0067] The solar energy and heat pump water supply system has multiple working modes. The specific working process of each working mode is introduced below.

[0068] The first working mode: the compressor 1 sends the high-temperature refrigerant to the second valve group 2, the second valve group 2 sends the refrigerant to the second water source heat exchanger 3, and controls the second water pump 18 to heat the water in the domestic hot water storage tank 14. The refrigerant is cooled by the second water source heat exchanger 3 and sent to the D port of the four-way reversing valve 4, and is sent to the fourth valve group 5 from the C port of the four-way reversing valve 4. The fourth valve group 5 sends the refrigerant that has undergone heat exchange and cooling once to the first water source heat exchanger 6, and controls the first water pump 17 to work to heat the water in the heat exchange water storage tank 15, so that the heat exchange water storage tank The water in 15 is heated up, and the refrigerant passes through the first water source heat exchanger 6 for secondary heat exchange and cooling, and is throttled by the expansion valve 8 to form a low-temperature and low-pressure refrigerant. The first valve group 9 then sends the refrigerant to the PVT photovoltaic module 13 for evaporation and heat absorption, thereby reducing the temperature of the photovoltaic panel of the PVT photovoltaic module 13. The refrigerant after heat absorption is sent to the E port of the four-way reversing valve 4 through the second switch valve 12, and flows from the S port of the four-way reversing valve 4 to the gas-liquid separator 16. The refrigerant that has been separated into gas and liquid by the gas-liquid separator 16 returns to the compressor 1, completing one cycle of the refrigerant.

[0069] When the solar energy and heat pump water supply system works in the first working mode, it can not only meet the thermal energy demand for preparing domestic hot water and heating hot water, but also make full use of the thermal energy in the PVT photovoltaic module 13, and avoid the excessive thermal energy of the PVT photovoltaic module 13 causing the photovoltaic panel temperature of the PVT photovoltaic module 13 to be too high, thereby reducing the power generation efficiency of the PVT photovoltaic module 13.

[0070] The second working mode: the compressor 1 sends the high-temperature refrigerant to the second valve group 2, the second valve group 2 sends the refrigerant to the second water source heat exchanger 3, and controls the second water pump 18 to heat the water in the domestic hot water storage tank 14. The refrigerant is cooled by the second water source heat exchanger 3 and sent to the D port of the four-way reversing valve 4, and is sent to the air heat exchanger 10 from the E port of the four-way reversing valve 4. The air heat exchanger 10 further cools the refrigerant and sends it to the first valve group 9. The refrigerant passes through the first valve group 9 to the expansion valve 8, and the low-temperature and low-pressure refrigerant is throttled by the expansion valve 8 to enter the first water source heat exchanger 6, and the second working mode is controlled. A water pump 17 works to exchange heat with the water in the heat exchange water tank 15 to cool the water in the heat exchange water tank 15. The refrigerant absorbs heat and heats up through the first water source heat exchanger 6, and then enters the PVT photovoltaic module 13 through the fourth valve group 5. The low-temperature refrigerant can absorb the heat in the PVT photovoltaic module 13 to heat up and reduce the temperature of the PVT photovoltaic module 13. The heated refrigerant passes through the first switch valve 11 to the C port of the four-way reversing valve 4, and flows from the S port of the four-way reversing valve 4 to the gas-liquid separator 16. The refrigerant that has been separated into gas and liquid by the gas-liquid separator 16 returns to the compressor 1, completing one cycle of the refrigerant.

[0071] When the solar energy and heat pump water supply system works in the second working mode, it can not only meet the thermal energy demand for preparing domestic hot water and the cooling demand of water in the heat exchange water tank 15, but also make full use of the thermal energy in the PVT photovoltaic module 13, and avoid the excessive thermal energy of the PVT photovoltaic module 13 causing the photovoltaic panel temperature of the PVT photovoltaic module 13 to be too high, thereby reducing the power generation efficiency of the PVT photovoltaic module 13.

[0072] The third working mode: the compressor 1 sends the high-temperature refrigerant to the second valve group 2, the second valve group 2 sends the refrigerant to the second water source heat exchanger 3, and controls the second water pump 18 to heat the water in the domestic hot water storage tank 14. The refrigerant is cooled by the second water source heat exchanger 3 and sent to the D port of the four-way reversing valve 4, and sent to the fourth valve group 5 from the C port of the four-way reversing valve 4. The fourth valve group 5 sends the refrigerant that has undergone heat exchange and cooling once to the first water source heat exchanger 6, and controls the first water pump 17 to heat the water in the heat exchange water storage tank 15, so that the water in the heat exchange water storage tank 15 is heated. After the refrigerant passes through the heat exchange water storage tank 15 for secondary heat exchange and cooling, it is throttled by the expansion valve 8 to form a low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant passes through the first valve group 9 to the air heat exchanger 10, and the fan equipped with the air heat exchanger 10 is used for forced convection, so that the refrigerant absorbs heat from the outdoor air through the air heat exchanger 10 to form a gaseous refrigerant. The gaseous refrigerant passes through the E port of the four-way reversing valve 4 and the S port of the four-way reversing valve 4 to the gas-liquid separator 16. The refrigerant that has been separated into gas and liquid by the gas-liquid separator 16 returns to the compressor 1, completing one cycle of the refrigerant.

[0073] When the solar energy and heat pump water supply system works in the third working mode, it can not only meet the thermal energy demand for preparing domestic hot water, but also use the air heat exchanger 10 to absorb heat from the outdoor air to heat the refrigerant to meet the thermal energy demand for preparing hot water for heating. Especially at night, when the PVT photovoltaic module 13 cannot meet the thermal energy demand for preparing domestic hot water and hot water for heating, the third working mode can be executed.

[0074] Fourth working mode: the compressor 1 sends the high-temperature refrigerant to the second valve group 2, the second valve group 2 sends the refrigerant to the second water source heat exchanger 3, and controls the second water pump 18 to heat the water in the domestic hot water storage tank 14. The refrigerant is cooled by the second water source heat exchanger 3 and sent to the D port of the four-way reversing valve 4, and then sent to the air heat exchanger 10 from the E port of the four-way reversing valve 4. The air heat exchanger 10 further cools the refrigerant and then sends it to the first valve group 9. The refrigerant passes through the first valve group 9 to the expansion valve 8. The refrigerant with low temperature and low pressure formed by throttling of the expansion valve 8 enters the first water source heat exchanger 6, and the first water pump 17 is controlled to work to exchange heat with the water in the heat exchange water storage tank 15, so that the water in the heat exchange water storage tank 15 is cooled. After absorbing heat and rising in temperature through the first water source heat exchanger 6, the refrigerant enters the C port of the four-way reversing valve 4 through the fourth valve group 5, and flows from the S port of the four-way reversing valve 4 to the gas-liquid separator 16. The refrigerant separated by gas and liquid through the gas-liquid separator 16 returns to the compressor 1, completing one cycle of the refrigerant.

[0075] When the solar energy and heat pump water supply system operates in the fourth working mode, it can not only meet the thermal energy demand for preparing domestic hot water, but also make full use of the fan equipped with the air radiator to perform forced convection to reduce the temperature of the refrigerant to meet the cooling demand of the water in the heat exchange water tank 15.

[0076] The fifth working mode: the compressor 1 sends the high-temperature refrigerant to the second valve group 2. There is no demand for thermal energy to prepare domestic hot water. The second valve group 2 sends the refrigerant to the D port of the four-way reversing valve 4, and sends it to the air heat exchanger 10 from the E port of the four-way reversing valve 4. The fan equipped with the air heat exchanger 10 performs forced convection to reduce the temperature of the refrigerant. The cooled refrigerant passes through the first valve group 9 to the expansion valve 8, and the low-temperature and low-pressure refrigerant is throttled by the expansion valve 8 and enters the first water source heat exchanger 6. The first water pump 17 is controlled to work to exchange heat with the water in the heat exchange water storage tank 15 to cool the water in the heat exchange water storage tank 15. After the refrigerant absorbs heat and heats up through the first water source heat exchanger 6, it enters the C port of the four-way reversing valve 4 through the fourth valve group 5, and flows from the S port of the four-way reversing valve 4 to the gas-liquid separator 16. The refrigerant that has been separated into gas and liquid by the gas-liquid separator 16 returns to the compressor 1, completing one cycle of the refrigerant.

[0077] When the solar energy and heat pump water supply system operates in the fifth working mode, the fan equipped with the air radiator can be used to perform forced convection to reduce the temperature of the refrigerant to meet the cooling demand of the water in the heat exchange water storage tank 15.

[0078] The sixth working mode: the compressor 1 sends the high-temperature refrigerant to the second valve group 2. There is no demand for thermal energy to prepare domestic hot water. The second valve group 2 sends the refrigerant to the D port of the four-way reversing valve 4, and sends it to the air heat exchanger 10 from the E port of the four-way reversing valve 4. The fan equipped with the air heat exchanger 10 performs forced convection to reduce the temperature of the refrigerant. There is no demand for cooling the water in the heat exchange water tank 15. The cooled refrigerant passes through the first valve group 9 to the PVT photovoltaic component 13. The refrigerant absorbs the heat energy in the PVT photovoltaic component 13 to increase its temperature and reduce the temperature of the PVT photovoltaic component 13. The heated refrigerant passes through the first switch valve 11 to the C port of the four-way reversing valve 4, and flows from the S port of the four-way reversing valve 4 to the gas-liquid separator 16. The refrigerant that has been separated into gas and liquid by the gas-liquid separator 16 returns to the compressor 1, completing one cycle of the refrigerant.

[0079] When the solar energy and heat pump water supply system works in the sixth working mode, the fan equipped with the air radiator can be used for forced convection to reduce the temperature of the refrigerant, and the low-temperature refrigerant can be used to absorb the heat energy in the PVT photovoltaic module 13 to avoid the excessive heat energy of the PVT photovoltaic module 13 causing the temperature of the photovoltaic panel of the PVT photovoltaic module 13 to be too high, thereby reducing the power generation efficiency of the PVT photovoltaic module 13.

[0080] The seventh working mode: the compressor 1 sends the high-temperature refrigerant to the second valve group 2. There is no heat energy demand for preparing domestic hot water. The second valve group 2 sends the refrigerant to the D port of the four-way reversing valve 4, and then sends it to the fourth valve group 5 from the C port of the four-way reversing valve 4. The high-temperature refrigerant passes through the fourth valve group 5 to the first water source heat exchanger 6, and controls the first water pump 17 to work to heat the water in the heat exchange water storage tank 15, so that the water in the heat exchange water storage tank 15 is heated. After the refrigerant passes through the heat exchange water storage tank 15 for heat exchange and cooling, it is cooled by the expansion valve 8 is throttled to form a low-temperature and low-pressure refrigerant, and the low-temperature and low-pressure refrigerant passes through the first valve group 9 to the air heat exchanger 10, and the fan equipped with the air heat exchanger 10 is used for forced convection, so that the refrigerant absorbs heat from the outdoor air through the air heat exchanger 10 to form a gaseous refrigerant, and the gaseous refrigerant passes through the E port of the four-way reversing valve 4 and the S port of the four-way reversing valve 4 to the gas-liquid separator 16. The refrigerant that has been separated into gas and liquid by the gas-liquid separator 16 returns to the compressor 1, completing one cycle of the refrigerant.

[0081] When the solar energy and heat pump water supply system works in the seventh working mode, the air heat exchanger 10 can absorb heat from the outdoor air to heat the refrigerant to meet the thermal energy demand for preparing hot water for heating. In particular, the seventh working mode can be executed at night when the PVT photovoltaic module 13 cannot meet the thermal energy demand for preparing domestic hot water and hot water for heating.

[0082] The eighth working mode: the compressor 1 sends the high-temperature refrigerant to the second valve group 2. There is no demand for thermal energy to prepare domestic hot water. The second valve group 2 sends the refrigerant to the D port of the four-way reversing valve 4, and from the C port of the four-way reversing valve 4 and the first switch valve 11 to the PVT photovoltaic module 13. The refrigerant absorbs the heat energy in the PVT photovoltaic module 13 to increase the temperature, and cools the PVT photovoltaic module 13. The refrigerant heated by the PVT photovoltaic module 13 passes through the first valve group 9 to the air heat exchanger 10, and the fan equipped with the air heat exchanger 10 is used for forced convection, so that the refrigerant absorbs heat from the outdoor air through the air heat exchanger 10 to form a gaseous refrigerant. The gaseous refrigerant passes through the E port of the four-way reversing valve 4 and flows from the S port of the four-way reversing valve 4 to the gas-liquid separator 16. The refrigerant that has been separated into gas and liquid by the gas-liquid separator 16 returns to the compressor 1, completing one cycle of the refrigerant.

[0083] When the solar energy and heat pump water supply system operates in the seventh working mode, the air heat exchanger 10 can absorb heat from the outdoor air to heat the refrigerant to meet the heating requirements of the PVT photovoltaic assembly 13 .

[0084] Ninth working mode: the compressor 1 sends the high-temperature refrigerant to the second valve group 2, the second valve group 2 sends the refrigerant to the second water source heat exchanger 3, and controls the second water pump 18 to heat the water in the domestic hot water storage tank 14. The refrigerant is cooled by the second water source heat exchanger 3 and sent to the D port of the four-way reversing valve 4, and is sent to the fourth valve group 5 from the C port of the four-way reversing valve 4. The fourth valve group 5 passes the refrigerant that has been cooled by heat exchange through the first water source heat exchanger 6. There is no need to cool the water in the heat exchange water storage tank 15. The refrigerant passes through the first water source heat exchanger 6. After the heat exchanger 6, the expansion valve 8 is throttled to form a low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant passes through the first valve group 9 to the air heat exchanger 10. The fan equipped with the air heat exchanger 10 is used for forced convection, so that the refrigerant absorbs heat from the outdoor air through the air heat exchanger 10 to form a gaseous refrigerant. The gaseous refrigerant passes through the E port of the four-way reversing valve 4 and the S port of the four-way reversing valve 4 to the gas-liquid separator 16. The refrigerant that has been separated into gas and liquid by the gas-liquid separator 16 returns to the compressor 1, completing one cycle of the refrigerant.

[0085] When the solar energy and heat pump water supply system works in the ninth working mode, the air heat exchanger 10 can absorb heat from the outdoor air to heat the refrigerant to meet the thermal energy demand for preparing domestic hot water. In particular, the ninth working mode can be executed at night when the PVT photovoltaic module 13 cannot meet the thermal energy demand for preparing domestic hot water.

[0086] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A solar energy and heat pump water supply system, characterized in that: The invention comprises a compressor (1), a four-way reversing valve (4), a first water source heat exchanger (6), an expansion valve (8) and an air heat exchanger (10) which are sequentially connected in series to form a heat exchange circulation loop; the solar energy and heat pump water supply system also comprises: A PVT photovoltaic assembly (13), wherein the PVT photovoltaic assembly (13) is arranged in parallel with the air heat exchanger (10); A first valve group (9), wherein the first valve group (9) enables any one of the PVT photovoltaic assembly (13) and the air heat exchanger (10) to be connected in series to the heat exchange circulation loop between the four-way reversing valve (4) and the expansion valve (8).

2. The solar energy and heat pump water supply system according to claim 1, characterized in that: It also comprises a second water source heat exchanger (3), which is connected in series to the heat exchange circulation loop between the outlet of the compressor (1) and the four-way reversing valve (4).

3. The solar energy and heat pump water supply system according to claim 2, characterized in that: It also includes a domestic hot water storage tank (14) and a heat exchange storage tank (15), wherein the second water source heat exchanger (3) is used to exchange heat for water in the domestic hot water storage tank (14), and the first water source heat exchanger (6) is used to exchange heat for water in the heat exchange storage tank (15).

4. The solar energy and heat pump water supply system according to claim 2, characterized in that: Also includes: A bypass pipeline (20), wherein the bypass pipeline (20) and the second water source heat exchanger (3) are arranged in parallel; A second valve group (2), the second valve group (2) is used to selectively connect the outlet of the compressor (1) to the second water source heat exchanger (3), or to the bypass pipeline (20).

5. The solar energy and heat pump water supply system according to claim 4, characterized in that: The first valve group (9) is a three-way valve, or the first valve group (9) includes a first switch valve and a second switch valve, the expansion valve (8) is connected to the air heat exchanger (10) via the first switch valve, and the expansion valve (8) is connected to the first end of the PVT photovoltaic module (13) via the second switch valve; And / or, the second valve group (2) is a three-way valve, or the second valve group (2) includes a switch valve three and a switch valve four, the outlet of the compressor (1) is connected to the second water source heat exchanger (3) via the switch valve three, and the switch valve four is arranged on the bypass pipeline (20).

6. The solar energy and heat pump water supply system according to claim 2, characterized in that: The four-way reversing valve (4) is connected to the first water source heat exchanger (6) via a first pipeline (30), and the four-way reversing valve (4) is connected to the air heat exchanger (10) via a second pipeline (40); The solar energy and heat pump water supply system also includes a third valve group (50), the first end of the PVT photovoltaic component (13) is connected to the first valve group (9), and the third valve group (50) is used to control the second end of the PVT photovoltaic component (13) to be connected to at least one of the first pipeline (30) and the second pipeline (40).

7. The solar energy and heat pump water supply system according to claim 6, characterized in that: The first pipeline (30) comprises a pipeline 1 (301) connected to the four-way reversing valve (4), and a pipeline 2 (302) connected to the first water source heat exchanger (6); The solar energy and heat pump water supply system also includes a fourth valve group (5), and the fourth valve group (5) is used to selectively connect the pipeline 2 (302) with the first end of the PVT photovoltaic component (13) and at least one of the pipeline 1 (301).

8. The solar energy and heat pump water supply system according to claim 7, characterized in that: The third valve group (50) is a three-way valve, or the third valve group (50) includes a first switch valve (11) and a second switch valve (12); the second end of the PVT photovoltaic component (13) is connected to the first pipeline (30) through the first switch valve (11), and the second end of the PVT photovoltaic component (13) is connected to the second pipeline (40) through the second switch valve (12); And / or, the fourth valve group (5) is a three-way valve, or the fourth valve group (5) includes a switch valve five and a switch valve six, the pipeline two (302) is connected to the first end of the PVT photovoltaic component (13) through the switch valve five, and the pipeline two (302) is connected to the pipeline one (301) through the switch valve six.

9. The solar energy and heat pump water supply system according to any one of claims 1 to 8, characterized in that: A balance tank (7) is provided on the heat exchange circulation loop between the expansion valve (8) and the first water source heat exchanger (6).

10. The solar energy and heat pump water supply system according to any one of claims 1 to 8, characterized in that: A gas-liquid separator (16) is provided on the heat exchange circulation loop between the four-way reversing valve (4) and the inlet of the compressor (1).

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