Photovoltaic photo-thermal device and control method and device of photovoltaic photo-thermal device

Abstract

The invention discloses a photovoltaic photo-thermal device and a control method and device of the photovoltaic photo-thermal device, and relates to the technical field of renewable energy sources. The system comprises the photovoltaic photo-thermal assembly, the energy storage assembly, the refrigerant circulation assembly, the water storage assembly and the reversing valve, and the photovoltaic photo-thermal assembly can heat the energy storage assembly in a low-temperature environment by using heat obtained through photo-thermal conversion by controlling the action of the reversing valve, so that the operation stability of an energy storage battery can be ensured, and the service life of the energy storage battery is prolonged. According to the photovoltaic photo-thermal module, the heated refrigerant can cool the condenser, hot water obtained through heat exchange is stored in the water storage module and can be used in daily life, and the cooled refrigerant can flow into the photovoltaic photo-thermal module and cool the photovoltaic photo-thermal module, so that the photoelectric conversion efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the field of renewable energy technology, and in particular to a photovoltaic thermal device, and a control method and device for the photovoltaic thermal device. Background Art

[0002] With the continuous development of renewable energy technology, the application of solar energy is becoming more and more extensive. At present, the solar energy products on the market are mainly divided into photovoltaic power generation and photothermal conversion. Among them, photovoltaic power generation can convert solar energy into electrical energy and send it to the energy storage component for storage, and then the energy storage component is operated and discharged for use by the equipment. However, in a low temperature environment, the performance of the energy storage component will be seriously affected, or even unable to work normally. In addition, within a certain temperature range, the photoelectric conversion efficiency of the photovoltaic panel decreases with the increase of temperature, so the higher the light intensity, the lower the efficiency of solar energy utilization. Summary of the invention

[0003] In view of the problems of poor operating stability and low photoelectric conversion efficiency of existing photovoltaic power generation energy storage batteries, the present invention is proposed to provide a photovoltaic thermal device, a control method and a device for a photovoltaic thermal device that overcome the above problems or at least partially solve the above problems.

[0004] Based on the first aspect of the present invention, a photovoltaic thermal device is provided, the device comprising:

[0005] Photovoltaic thermal components;

[0006] An energy storage component, the energy storage component is electrically connected to the photovoltaic thermal component, wherein the energy storage component includes a liquid cooling inlet end and a liquid cooling outlet end;

[0007] A refrigerant circulation component, the refrigerant circulation component is connected to the photovoltaic thermal component to perform heat exchange with the photovoltaic thermal component through a refrigerant, wherein the refrigerant circulation component includes a condenser, and the liquid cooling outlet is connected to the condenser;

[0008] A water storage assembly, the water storage assembly being in fluid communication with the condenser to exchange heat with the refrigerant in the condenser;

[0009] A reversing valve, wherein the first end of the reversing valve is connected to the refrigerant outlet of the photovoltaic thermal assembly, the second end of the reversing valve is connected to the liquid cooling inlet, and the third end of the reversing valve is connected to the condenser; wherein,

[0010] When the first end is connected to the second end, the heat generated by the photovoltaic thermal assembly is absorbed by the refrigerant, and the refrigerant after absorbing the heat passes through the energy storage assembly, heats the energy storage assembly, and then flows to the condenser;

[0011] When the first end is connected to the third end, the heat generated by the photovoltaic thermal assembly is absorbed by the refrigerant, and the refrigerant exchanges heat with the water in the water storage assembly through the condenser to condense the refrigerant.

[0012] In an optional invention, the energy storage component comprises:

[0013] An inverter, the inverter being electrically connected to the photovoltaic thermal assembly;

[0014] An energy storage battery, the energy storage battery being electrically connected to the inverter;

[0015] A water-cooled shell is provided with a battery cavity for accommodating the energy storage battery, and the liquid-cooled liquid inlet and liquid-cooled liquid outlet are provided on the water-cooled shell.

[0016] In an optional invention, the refrigerant cycle assembly further comprises:

[0017] A compressor, wherein a refrigerant inlet of the compressor is connected to a refrigerant outlet of the photovoltaic thermal assembly to compress the refrigerant flowing out of the photovoltaic thermal assembly, wherein the refrigerant outlet of the compressor is connected to a first end of the reversing valve;

[0018] An electronic expansion valve is arranged between the refrigerant outlet of the condenser and the refrigerant inlet of the photovoltaic thermal component to throttle and reduce the pressure of the liquid-cooled refrigerant flowing out of the condenser, and the refrigerant after throttling and reducing the pressure flows to the photovoltaic thermal component to cool the photovoltaic thermal component.

[0019] An optional invention content is that the refrigerant circulation component also includes a liquid reservoir, and the liquid reservoir is located between the photovoltaic thermal component and the electronic expansion valve.

[0020] An optional invention content is that the refrigerant cycle component also includes a gas-liquid separator, and the gas-liquid separator is located between the photovoltaic thermal component and the compressor.

[0021] An optional invention content, the water storage assembly includes:

[0022] Water tank;

[0023] A water storage pipeline, wherein the water tank is in fluid communication with the water storage pipeline, and the water storage pipeline is in fluid communication with the condenser;

[0024] A water pump is installed in the water storage pipe so that the water in the water tank and the refrigerant form a heat exchange cycle.

[0025] An optional invention content, the reversing valve is an electrically driven valve, the photovoltaic thermal device further includes a controller, and a temperature sensor installed on the energy storage component, the temperature sensor and the reversing valve are electrically connected to the controller respectively;

[0026] The controller receives the temperature value detected by the temperature sensor and controls the action of the reversing valve according to the temperature value.

[0027] Based on the second aspect of the present invention, a control method of a photovoltaic thermal device is also provided, wherein the photovoltaic thermal device includes the photovoltaic thermal device as described in any one of the above invention contents, and the control method includes:

[0028] Obtain the temperature value of the energy storage component detected by the temperature sensor;

[0029] Determining whether the temperature value meets the operating temperature condition;

[0030] The action of the reversing valve is controlled according to the result of the condition determination.

[0031] An optional invention content, the controlling the action of the reversing valve according to the condition determination result includes:

[0032] When the temperature value does not meet the working temperature condition, the reversing valve is controlled to operate so that the first end is connected to the second end.

[0033] An optional invention content, the controlling the action of the reversing valve according to the condition determination result includes:

[0034] When the temperature value meets the working temperature condition, the reversing valve is controlled to operate so that the first end is connected to the third end.

[0035] Based on the third aspect of the present invention, a control device for a photovoltaic thermal device is further provided, wherein the photovoltaic thermal device comprises the photovoltaic thermal device as described in any one of the above invention contents, and the control device comprises:

[0036] A temperature acquisition module is used to obtain the temperature value of the energy storage component detected by the temperature sensor;

[0037] A temperature condition determination module, used to determine whether the temperature value meets the working temperature condition;

[0038] The valve control module is used to control the action of the reversing valve according to the condition determination result.

[0039] In an optional invention, the valve control module is further used for:

[0040] When the temperature value does not meet the working temperature condition, the reversing valve is controlled to operate so that the first end is connected to the second end.

[0041] In an optional invention, the valve control module is further used for:

[0042] When the temperature value meets the working temperature condition, the reversing valve is controlled to operate so that the first end is connected to the third end.

[0043] Compared with the prior art, the present invention includes a photovoltaic thermal component, an energy storage component, a refrigerant circulation component, a water storage component and a reversing valve. The energy storage component is electrically connected to the photovoltaic thermal component, wherein the energy storage component includes a liquid cooling inlet and a liquid cooling outlet. The refrigerant circulation component is connected to the photovoltaic thermal component to exchange heat with the photovoltaic thermal component through a refrigerant, wherein the refrigerant circulation component includes a condenser, and the liquid cooling outlet is connected to the condenser. The water storage component is connected to the condenser in a liquid path to exchange heat with the refrigerant in the condenser. The first end of the reversing valve is connected to the refrigerant outlet of the photovoltaic thermal component, the second end of the reversing valve is connected to the liquid cooling inlet, and the third end of the reversing valve is connected to the condenser. When the first end is connected to the second end, the heat generated by the photovoltaic thermal component is absorbed by the refrigerant, and the refrigerant after absorbing the heat passes through the energy storage component, heats the energy storage component, and then flows to the condenser. When the first end is connected to the third end, the heat generated by the photovoltaic thermal component is absorbed by the refrigerant, and the refrigerant exchanges heat with the water in the water storage component through the condenser to condense the refrigerant. Therefore, the photovoltaic power generation technology and the photothermal conversion technology can be combined to improve the efficiency of solar energy utilization, and the heat obtained by photothermal conversion can be used by the photovoltaic thermal component to heat the energy storage component in a low temperature environment, thereby ensuring the operating stability of the energy storage battery. The heated refrigerant can cool the condenser, and the hot water obtained by heat exchange can be used for daily life. The cooled refrigerant can cool the photovoltaic thermal component, thereby improving the photoelectric conversion efficiency.

[0044] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limitations of the present invention. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings.

[0046] In the attached picture:

[0047] Figure 1 is a schematic structural diagram of a photovoltaic thermal device provided by an embodiment of the present invention;

[0048] Figure 2 is an electrical connection block diagram of a controller provided by an embodiment of the present invention;

[0049] Figure 3 It is a schematic flow chart of the steps of a control method of a photovoltaic thermal device provided by an embodiment of the present invention;

[0050] Figure 4 is a structural block diagram of a control device for a photovoltaic thermal device provided by an embodiment of the present invention;

[0051] Figure numerals: 1. Photovoltaic thermal component; 2. Energy storage component; 21. Inverter; 22. Energy storage battery; 3. Refrigerant cycle component; 31. Condenser; 32. Compressor; 33. Electronic expansion valve; 34. Liquid reservoir; 35. Gas-liquid separator; 4. Water storage component; 41. Water tank; 42. Water storage pipeline; 43. Water pump; 5. Reversing valve; 501. First end; 502. Second end; 503. Third end; 6. Controller; 7. Temperature sensor. DETAILED DESCRIPTION

[0052] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0053] With the continuous development of renewable energy technology, the application of solar energy is becoming more and more extensive. At present, the solar energy products on the market are mainly divided into photovoltaic power generation and photothermal conversion. Among them, photovoltaic power generation can convert solar energy into electrical energy and send it to the energy storage component for storage, and then the energy storage component is operated and discharged for use by the equipment. However, in a low temperature environment, the performance of the energy storage component will be seriously affected, or even unable to work normally. In addition, within a certain temperature range, the photoelectric conversion efficiency of the photovoltaic panel decreases with the increase of temperature, so the higher the light intensity, the lower the efficiency of solar energy utilization.

[0054] Based on the above technical problems, an embodiment of the present invention is proposed. The embodiment of the present invention may include a photovoltaic thermal component 1, an energy storage component 2, a refrigerant circulation component 3, a water storage component 4 and a reversing valve 5. The energy storage component 2 is electrically connected to the photovoltaic thermal component 1, wherein the energy storage component 2 includes a liquid cooling inlet and a liquid cooling outlet. The refrigerant circulation component 3 is connected to the photovoltaic thermal component 1 to exchange heat with the photovoltaic thermal component 1 through a refrigerant, wherein the refrigerant circulation component 3 includes a condenser 31, and the liquid cooling outlet is connected to the condenser 31. The water storage component 4 is connected to the condenser 31 in a liquid path to exchange heat with the refrigerant in the condenser 31. The first end 501 of the reversing valve 5 is connected to the refrigerant outlet of the photovoltaic thermal component 1, the second end 502 of the reversing valve 5 is connected to the liquid cooling inlet, and the third end 503 of the reversing valve 5 is connected to the condenser 31. When the first end 501 is connected to the second end 502, the heat generated by the photovoltaic thermal component 1 is absorbed by the refrigerant, and the refrigerant after absorbing the heat passes through the energy storage component 2, heats up the energy storage component 2, and then flows to the condenser 31. When the first end 501 is connected to the third end 503, the heat generated by the photovoltaic thermal component 1 is absorbed by the refrigerant, and the refrigerant exchanges heat with the water in the water storage component 4 through the condenser 31 to condense the refrigerant. Thus, the photovoltaic power generation technology and the photothermal conversion technology can be combined to improve the utilization efficiency of solar energy, and the heat obtained by photothermal conversion can be used by the photovoltaic thermal component 1 to heat the energy storage component 2 in a low temperature environment, so as to ensure the operation stability of the energy storage battery 22, and the heated refrigerant can cool the condenser 31, and the hot water obtained by heat exchange can be used for daily life. The cooled refrigerant can cool the photovoltaic thermal component 1, so as to improve the photoelectric conversion efficiency.

[0055] Reference Figure 1 and Figure 2The embodiment of the present invention provides a photovoltaic thermal device, which may include a photovoltaic thermal component 1, an energy storage component 2, a refrigerant circulation component 3, a water storage component 4 and a reversing valve 5, wherein the energy storage component 2 is electrically connected to the photovoltaic thermal component 1, wherein the energy storage component 2 includes a liquid cooling inlet and a liquid cooling outlet. The refrigerant circulation component 3 is connected to the photovoltaic thermal component 1 to exchange heat with the photovoltaic thermal component 1 through a refrigerant, wherein the refrigerant circulation component 3 includes a condenser 31, and the liquid cooling outlet is connected to the condenser 31. The water storage component 4 is connected to the condenser 31 in a liquid path to exchange heat with the refrigerant in the condenser 31. The first end 501 of the reversing valve 5 is connected to the refrigerant outlet of the photovoltaic thermal component 1, the second end 502 of the reversing valve 5 is connected to the liquid cooling inlet, and the third end 503 of the reversing valve 5 is connected to the condenser 31. When the first end 501 is connected to the second end 502, the heat generated by the photovoltaic thermal assembly 1 is absorbed by the refrigerant, and the refrigerant after absorbing the heat passes through the energy storage assembly 2, heats the energy storage assembly 2, and then flows to the condenser 31. When the first end 501 is connected to the third end 503, the heat generated by the photovoltaic thermal assembly 1 is absorbed by the refrigerant, and the refrigerant exchanges heat with the water in the water storage assembly 4 through the condenser 31 to condense the refrigerant.

[0056] In an embodiment of the present invention, the photovoltaic thermal component 1 is used to convert solar energy into electrical energy and thermal energy. For example, the photovoltaic thermal component 1 includes a photovoltaic component and a thermal collector. The photovoltaic component is used to convert solar energy into electrical energy through the photovoltaic effect, and the thermal collector uses the waste heat generated on the back of the photovoltaic component to convert solar energy into thermal energy through a thermal cycle mechanism. The energy storage component 2 is electrically connected to the electrical output end of the photovoltaic thermal component 1 to send the electrical energy converted by the photovoltaic component in the photovoltaic thermal component 1 into the energy storage component 2 for storage.

[0057] The energy storage component 2 is used to store the electrical energy obtained through photoelectric conversion in the photovoltaic thermal component 1. For example, the energy storage component 2 may include a liquid-cooled liquid inlet and a liquid-cooled liquid outlet. A circulating medium can be introduced through the liquid-cooled liquid inlet, so that the energy storage component 2 can be heated by a circulating medium with a higher temperature in a low-temperature environment, thereby ensuring that the energy storage component 2 can operate stably in a low-temperature environment.

[0058] The refrigerant circulation component 3 is used to form a refrigeration cycle by utilizing the heating and cooling of the refrigerant. For example, one end of the refrigerant circulation component 3 is connected to the liquid outlet of the photovoltaic thermal component 1 in a liquid path, and the other end of the refrigerant circulation component 3 is connected to the liquid inlet of the photovoltaic thermal component 1 in a liquid path. The refrigerant in the refrigerant circulation component 3 is heat-exchanged with the heat energy generated by the photovoltaic thermal component 1, so that the temperature of the photovoltaic thermal component 1 can be reduced, for example, the temperature of the photovoltaic thermal component 1 can be reduced to a suitable temperature range, thereby improving the photoelectric conversion efficiency of the photovoltaic component in the photovoltaic thermal component 1. For example, the refrigerant circulation component 3 includes at least a condenser 31, and the refrigerant inlet of the condenser 31 is connected to the liquid cooling outlet of the energy storage component 2 in a liquid path. In some optional embodiments, the refrigerant can be Freon.

[0059] The water storage component 4 is used to store hot water for use in daily life. One end of the water storage component 4 is connected to the liquid inlet liquid path of the condenser 31, and the other end of the water storage component 4 is connected to the liquid outlet liquid path of the condenser 31. The water in the water outlet component is introduced into the condenser 31, and the water in the condenser 31 performs heat exchange with the refrigerant in the condenser 31, the water in the water storage component 4 is heated, and the refrigerant is condensed to obtain a low-temperature liquid refrigerant. Finally, the low-temperature liquid-cooled refrigerant flows into the photovoltaic thermal component 1 to cool the photovoltaic thermal component 1.

[0060] The reversing valve 5 is used to control the refrigerant flow path in the photovoltaic thermal device. For example, the reversing valve 5 at least includes a first end 501, a second end 502 and a third end 503. The first end 501 of the reversing valve 5 is connected to the refrigerant outlet of the photovoltaic thermal component 1, the second end 502 of the reversing valve 5 is connected to the liquid cooling inlet end of the energy storage component 2, and the third end 503 of the reversing valve 5 is connected to the refrigerant inlet of the condenser 31. Therefore, the reversing valve 5 is controlled so that when the first end 501 and the second end 502 are connected, the heat generated by the photovoltaic thermal component 1 is absorbed by the refrigerant flowing through the photovoltaic thermal component 1, and the high-temperature refrigerant after absorbing the heat flows into the energy storage component 2 after passing through the reversing valve 5. The high-temperature refrigerant heats up the energy storage component 2, thereby ensuring the working stability of the energy storage component 2. The cooled refrigerant flows into the condenser 31 through the liquid cooling outlet of the energy storage component 2 to condense and release heat, and the released heat is absorbed by the water in the water storage component 4, so that the water in the water storage component 4 is heated up and becomes hot water. The low-temperature refrigerant flows out of the condenser 31 and flows to the photovoltaic thermal component 1 to cool the photovoltaic thermal component 1, thereby improving the photoelectric conversion efficiency of the photovoltaic thermal component 1.

[0061] The reversing valve 5 is controlled so that when the first end 501 and the third end 503 are connected, the heat generated by the photovoltaic thermal component 1 is absorbed by the refrigerant flowing through the photovoltaic thermal component 1, and the high-temperature refrigerant after absorbing the heat flows into the condenser 31 after passing through the reversing valve 5. The high-temperature refrigerant condenses and releases heat in the condenser 31, and the released heat is absorbed by the water in the water storage component 4, so that the water in the water storage component 4 is heated up and becomes hot water. The low-temperature refrigerant flows out of the condenser 31 and flows to the photovoltaic thermal component 1, cooling the photovoltaic thermal component 1, thereby improving the photoelectric conversion efficiency of the photovoltaic thermal component 1.

[0062] The embodiment of the present invention can combine photovoltaic power generation technology and photothermal conversion technology to improve the utilization efficiency of solar energy, and can use the heat obtained by photothermal conversion through the photovoltaic thermal component 1 to heat the energy storage component 2 in a low temperature environment, thereby ensuring the operating stability of the energy storage battery 22. The heated refrigerant can cool the condenser 31, and the hot water obtained by heat exchange can be used in daily life. The cooled refrigerant can cool the photovoltaic thermal component 1, thereby improving the photoelectric conversion efficiency.

[0063] In an optional embodiment of the invention, the energy storage component 2 may include an inverter 21, an energy storage battery 22, and a water-cooled housing, wherein the inverter 21 is electrically connected to the photovoltaic thermal component 1. The energy storage battery 22 is electrically connected to the inverter 21. The water-cooled housing is provided with a battery cavity for accommodating the energy storage battery 22, and the liquid-cooled liquid inlet and liquid-cooled liquid outlet are provided on the water-cooled housing.

[0064] In an embodiment of the present invention, the energy storage component 2 may include an inverter 21, an energy storage battery 22, and a water-cooled housing. The power input end of the inverter 21 is electrically connected to the photovoltaic thermal component 1, and the power output end of the inverter 21 is electrically connected to the energy storage battery 22. The inverter 21 is used to convert the direct current power converted by the photovoltaic thermal component 1 into alternating current, and send it to the energy storage battery 22 for power storage, so as to provide power for equipment in areas such as homes and offices.

[0065] The water-cooled housing is provided with a battery cavity for accommodating the energy storage battery 22. The liquid cooling inlet and outlet are respectively provided on the water-cooled housing and are respectively connected to the battery cavity by a liquid path. Thus, the high-temperature refrigerant can heat the energy storage battery 22 after entering the battery cavity. Thus, the operation stability of the energy storage battery 22 in a low-temperature environment can be improved.

[0066] In an optional embodiment of the invention, the refrigerant circulation component 3 may also include a compressor 32 and an electronic expansion valve 33, wherein the refrigerant inlet of the compressor 32 is connected to the refrigerant outlet of the photovoltaic thermal component 1 to compress the refrigerant flowing out of the photovoltaic thermal component 1, wherein the refrigerant outlet of the compressor 32 is connected to the first end 501 of the reversing valve 5. The electronic expansion valve 33 is arranged between the refrigerant outlet of the condenser 31 and the refrigerant inlet of the photovoltaic thermal component 1 to throttle and reduce the pressure of the liquid-cooled refrigerant flowing out of the condenser 31, and the throttled and reduced-pressure refrigerant flows to the photovoltaic thermal component 1 to cool the photovoltaic thermal component 1.

[0067] In the embodiment of the present invention, the refrigerant cycle component 3 may further include a compressor 32 and an electronic expansion valve 33, wherein the refrigerant inlet of the compressor 32 is connected to the refrigerant outlet of the photovoltaic thermal component 1 to compress the refrigerant flowing out of the photovoltaic thermal component 1. The compressor 32 is used to elevate low-pressure gas to high-pressure gas, and during the lifting process, the volume of the gas is reduced, thereby increasing the pressure and density of the gas. Thus, the compressor 32 mainly compresses the gaseous refrigerant into a high-temperature and high-pressure gas, and sends the high-temperature and high-pressure gas refrigerant into the reversing valve 5 connected to the compressor 32.

[0068] One end of the electronic expansion valve 33 is connected to the refrigerant outlet in the condenser 31, and the other end of the electronic expansion valve 33 is connected to the refrigerant inlet of the photovoltaic thermal component 1. The electronic expansion valve 33 is used to control the flow of liquid refrigerant from the high-pressure side to the low-pressure side. When the liquid refrigerant enters the photovoltaic thermal component 1 through the electronic expansion valve 33, the liquid refrigerant after throttling and pressure reduction will become liquid refrigerant and gaseous refrigerant, or gaseous refrigerant. And the refrigerant processed by the electronic expansion valve 33 flows into the photovoltaic thermal component 1, and cools down the photovoltaic components in the photovoltaic thermal component 1.

[0069] The reversing valve 5 is controlled so that when the first end 501 and the second end 502 are connected, the heat generated by the photovoltaic thermal component 1 is absorbed by the refrigerant flowing through the photovoltaic thermal component 1. The high-temperature refrigerant after absorbing the heat flows through the reversing valve 5 and then flows into the energy storage component 2. The high-temperature refrigerant heats up the energy storage component 2, thereby ensuring the working stability of the energy storage component 2. The cooled refrigerant flows into the condenser 31 through the liquid cooling outlet in the energy storage component 2 to condense and release heat. The released heat is absorbed by the water in the water storage component 4, causing the water in the water storage component 4 to heat up and become hot water. The low-temperature refrigerant flows out of the condenser 31 and flows to the photovoltaic thermal component 1 to cool down the photovoltaic thermal component 1, thereby improving the photoelectric conversion efficiency of the photovoltaic thermal component 1.

[0070] The reversing valve 5 is controlled so that when the first end 501 and the third end 503 are connected, the heat generated by the photovoltaic thermal component 1 is absorbed by the refrigerant flowing through the photovoltaic thermal component 1, and the high-temperature refrigerant after absorbing the heat flows into the condenser 31 after passing through the reversing valve 5. The high-temperature refrigerant condenses and releases heat in the condenser 31, and the released heat is absorbed by the water in the water storage component 4, so that the water in the water storage component 4 is heated up and becomes hot water. The low-temperature refrigerant flows out of the condenser 31 and flows to the photovoltaic thermal component 1, cooling the photovoltaic thermal component 1, thereby improving the photoelectric conversion efficiency of the photovoltaic thermal component 1. In summary, the embodiments of the present invention can combine photovoltaic power generation technology and photothermal conversion technology to improve the utilization efficiency of solar energy, and can use the heat obtained by photothermal conversion through the photovoltaic thermal component 1 to heat the energy storage component 2 in a low temperature environment, thereby ensuring the operating stability of the energy storage battery 22. The heated refrigerant can cool the condenser 31, and the hot water obtained by heat exchange can be used in daily life. The cooled refrigerant can cool the photovoltaic thermal component 1, thereby improving the photoelectric conversion efficiency and improving the overall utilization efficiency of the photovoltaic thermal device for solar energy.

[0071] In an optional embodiment of the invention, the refrigerant circulation component 3 further includes a liquid reservoir 34 , and the liquid reservoir 34 is located between the photovoltaic thermal component 1 and the electronic expansion valve 33 .

[0072] In the embodiment of the present invention, the refrigerant circulation assembly 3 may further include a liquid reservoir 34, which is located between the photovoltaic thermal assembly 1 and the electronic expansion valve 33, so as to store the liquid refrigerant after throttling and depressurization, and prevent excessive liquid refrigerant from entering the photovoltaic thermal assembly 1. In addition, the liquid reservoir 34 can also store and release the liquid refrigerant as needed, so as to avoid problems such as unstable pressure or low refrigeration efficiency of the refrigerant circulation assembly 3 caused by load fluctuations.

[0073] In an optional embodiment of the invention, the refrigerant cycle component 3 further includes a gas-liquid separator 35 , and the gas-liquid separator 35 is located between the photovoltaic thermal component 1 and the compressor 32 .

[0074] In the embodiment of the present invention, the refrigerant cycle component 3 may further include a gas-liquid separator 35, and the gas-liquid separator 35 is located between the photovoltaic thermal component 1 and the compressor 32. The gas-liquid separator 35 can be used to separate or store the liquid generated in the compressor 32, so as to avoid liquid hammering caused by the liquid entering the compressor 32. Liquid hammering refers to the phenomenon that after the liquid enters the compressor 32, due to its small compression ratio, it is easy to damage the valve plate and other power components of the compressor 32, so the gas-liquid separator 35 protects the compressor 32 by storing these liquids.

[0075] In an optional embodiment of the invention, the water storage assembly 4 may include a water tank 41, a water storage pipe 42, and a water pump 43, wherein the water tank 41 is in fluid communication with the water storage pipe 42, and the water storage pipe 42 is in fluid communication with the condenser 31. The water pump 43 is installed in the water storage pipe 42 so that the water in the water tank 41 forms a heat exchange cycle with the refrigerant.

[0076] In the embodiment of the present invention, the water storage assembly 4 is installed near the condenser 31, wherein the water storage assembly 4 may further include a water tank 41, a water storage pipe 42 and a water pump 43. A certain amount of water is stored in the water tank 41, wherein the liquid inlet of the water tank 41 is in fluid communication with one end of the water storage pipe 42, the liquid outlet of the water tank 41 is in fluid communication with the other end of the water storage pipe 42, and the middle area of ​​the water storage pipe 42 is in fluid communication with the condenser 31. In addition, the water pump 43 is installed in the water storage pipe 42. When the water pump 43 is working, the water in the water tank 41 is drawn into the water storage pipe 42 to perform heat exchange with the high-temperature refrigerant in the condenser 31. The hot water after the heat exchange circulates in the water storage pipe 42 and flows back to the water tank 41, thereby heating the water in the water tank 41 during the water circulation process to obtain domestic hot water.

[0077] An optional embodiment of the invention, referring to Figure 2 As shown, the reversing valve 5 is an electrically driven valve, and the photovoltaic thermal device further includes a controller 6 and a temperature sensor 7 installed on the energy storage component 2, and the temperature sensor 7 and the reversing valve 5 are respectively electrically connected to the controller 6. The controller 6 receives the temperature value detected by the temperature sensor 7, and controls the action of the reversing valve 5 according to the temperature value.

[0078] In the embodiment of the present invention, the reversing valve 5 is an electrically driven valve, for example, the reversing valve 5 may be an electric three-way valve or the like. The photovoltaic thermal device may further include a controller 6 and a temperature sensor 7, the temperature sensor 7 being mounted on the energy storage component 2, for example, the temperature sensor 7 may be mounted on the surface of the energy storage battery 22, so that the surface temperature of the energy storage battery 22 may be detected, so as to determine whether the temperature of the energy storage battery 22 is too low through the temperature value detected by the temperature sensor 7.

[0079] The temperature sensor 7 and the reversing valve 5 are electrically connected to the controller 6 respectively. The controller 6 receives the temperature value. When it is determined based on the temperature value that the surface temperature of the energy storage battery 22 is too low and will affect the operating stability of the energy storage battery 22, the controller 6 can control the reversing valve 5 to operate so that the first end 501 and the second end 502 are connected. At this time, the heat generated by the photovoltaic thermal component 1 is absorbed by the refrigerant flowing through the photovoltaic thermal component 1. The high-temperature refrigerant after absorbing the heat flows into the energy storage component 2 after passing through the reversing valve 5. The high-temperature refrigerant heats up the energy storage component 2, thereby ensuring the working stability of the energy storage component 2. The cooled refrigerant flows into the condenser 31 through the liquid cooling outlet in the energy storage component 2 to condense and release heat. The released heat is absorbed by the water in the water storage component 4, so that the water in the water storage component 4 is heated up and becomes hot water. The low-temperature refrigerant flows out of the condenser 31 and flows to the photovoltaic thermal assembly 1 to cool the photovoltaic thermal assembly 1 , thereby improving the photoelectric conversion efficiency of the photovoltaic thermal assembly 1 .

[0080] When it is determined based on the temperature value that the surface temperature of the energy storage battery 22 is normal, for example, when it is in the operating temperature range, the controller 6 can control the reversing valve 5 to operate so that the first end 501 is connected to the third end 503. At this time, the heat generated by the photovoltaic thermal component 1 is absorbed by the refrigerant flowing through the photovoltaic thermal component 1, and the high-temperature refrigerant after absorbing the heat flows into the condenser 31 after passing through the reversing valve 5. The high-temperature refrigerant condenses and releases heat in the condenser 31, and the released heat is absorbed by the water in the water storage component 4, so that the water in the water storage component 4 heats up and becomes hot water. The low-temperature refrigerant flows out of the condenser 31 and flows to the photovoltaic thermal component 1, cooling the photovoltaic thermal component 1, thereby improving the photoelectric conversion efficiency of the photovoltaic thermal component 1. In summary, the embodiments of the present invention can combine photovoltaic power generation technology and photothermal conversion technology to improve the utilization efficiency of solar energy, and can use the heat obtained by photothermal conversion through the photovoltaic thermal component 1 to heat the energy storage component 2 in a low temperature environment, thereby ensuring the operating stability of the energy storage battery 22. The heated refrigerant can cool the condenser 31, and the hot water obtained by heat exchange can be used in daily life. The cooled refrigerant can cool the photovoltaic thermal component 1, thereby improving the photoelectric conversion efficiency and improving the overall utilization efficiency of the photovoltaic thermal device for solar energy.

[0081] In summary, the embodiment of the present invention discloses a photovoltaic thermal device, which may include a photovoltaic thermal component 1, an energy storage component 2, a refrigerant circulation component 3, a water storage component 4, and a reversing valve 5. The energy storage component 2 is electrically connected to the photovoltaic thermal component 1, wherein the energy storage component 2 includes a liquid cooling inlet and a liquid cooling outlet. The refrigerant circulation component 3 is connected to the photovoltaic thermal component 1 to exchange heat with the photovoltaic thermal component 1 through a refrigerant, wherein the refrigerant circulation component 3 includes a condenser 31, and the liquid cooling outlet is connected to the condenser 31. The water storage component 4 is connected to the condenser 31 in a liquid path to exchange heat with the refrigerant in the condenser 31. The first end 501 of the reversing valve 5 is connected to the refrigerant outlet of the photovoltaic thermal component 1, the second end 502 of the reversing valve 5 is connected to the liquid cooling inlet, and the third end 503 of the reversing valve 5 is connected to the condenser 31. When the first end 501 is connected to the second end 502, the heat generated by the photovoltaic thermal component 1 is absorbed by the refrigerant, and the refrigerant after absorbing the heat passes through the energy storage component 2, heats up the energy storage component 2, and then flows to the condenser 31. When the first end 501 is connected to the third end 503, the heat generated by the photovoltaic thermal component 1 is absorbed by the refrigerant, and the refrigerant exchanges heat with the water in the water storage component 4 through the condenser 31 to condense the refrigerant. Thus, the photovoltaic power generation technology and the photothermal conversion technology can be combined to improve the utilization efficiency of solar energy, and the heat obtained by photothermal conversion can be used by the photovoltaic thermal component 1 to heat the energy storage component 2 in a low temperature environment, so as to ensure the operation stability of the energy storage battery 22, and the heated refrigerant can cool the condenser 31, and the hot water obtained by heat exchange can be used for daily life. The cooled refrigerant can cool the photovoltaic thermal component 1, so as to improve the photoelectric conversion efficiency.

[0082] Reference Figure 3 As shown, the embodiment of the present invention further discloses a control method for a photovoltaic thermal device, the control method is applied to the controller 6, and the control method includes:

[0083] S301. Obtain the temperature value of the energy storage component detected by a temperature sensor.

[0084] S302: Determine whether the temperature value meets the working temperature condition.

[0085] S303: Control the action of the reversing valve according to the result of the condition determination.

[0086] In the embodiment of the present invention, the temperature sensor 7 can be installed on the surface of the energy storage battery 22, so that the surface temperature of the energy storage battery 22 can be detected, and the temperature value detected by the temperature sensor 7 can be used to determine whether the temperature of the energy storage battery 22 is too low. For example, the lower temperature threshold at which the energy storage battery 22 can operate stably can be determined based on the temperature test result of the energy storage battery 22, and the working temperature condition can be determined based on the lower temperature threshold. In some embodiments, the working temperature condition at least includes: the temperature value is less than or equal to the lower temperature threshold. Therefore, the action of the reversing valve 5 can be controlled by the specific condition determination result.

[0087] If it is determined that the temperature value meets the working temperature condition, it is determined that the energy storage battery 22 can operate stably in the current temperature environment, so there is no need to heat up the energy storage battery 22. If it is determined that the temperature value does not meet the working temperature condition, it is determined that the energy storage battery 22 cannot operate stably in the current low temperature environment, and the energy storage battery 22 needs to be heated, so the energy storage battery 22 needs to be heated.

[0088] Therefore, when it is determined that the temperature value does not meet the working temperature condition, the controller 6 can control the reversing valve 5 to operate so that the first end 501 and the second end 502 are connected. At this time, the heat generated by the photovoltaic thermal component 1 is absorbed by the refrigerant flowing through the photovoltaic thermal component 1. The high-temperature refrigerant after absorbing the heat flows into the energy storage component 2 after passing through the reversing valve 5. The high-temperature refrigerant heats up the energy storage component 2, thereby ensuring the working stability of the energy storage component 2. The cooled refrigerant flows into the condenser 31 through the liquid cooling outlet in the energy storage component 2 to condense and release heat. The released heat is absorbed by the water in the water storage component 4, so that the water in the water storage component 4 is heated up and becomes hot water. The low-temperature refrigerant flows out of the condenser 31 and flows to the photovoltaic thermal component 1 to cool down the photovoltaic thermal component 1, thereby improving the photoelectric conversion efficiency of the photovoltaic thermal component 1.

[0089] When it is determined that the temperature value meets the working temperature condition, the controller 6 can control the reversing valve 5 to operate so that the first end 501 is connected to the third end 503. At this time, the heat generated by the photovoltaic thermal component 1 is absorbed by the refrigerant flowing through the photovoltaic thermal component 1, and the high-temperature refrigerant after absorbing the heat flows into the condenser 31 after passing through the reversing valve 5. The high-temperature refrigerant condenses and releases heat in the condenser 31, and the released heat is absorbed by the water in the water storage component 4, so that the water in the water storage component 4 heats up and becomes hot water. The low-temperature refrigerant flows out of the condenser 31 and flows to the photovoltaic thermal component 1, cooling the photovoltaic thermal component 1, thereby improving the photoelectric conversion efficiency of the photovoltaic thermal component 1. In summary, the embodiments of the present invention can combine photovoltaic power generation technology and photothermal conversion technology to improve the utilization efficiency of solar energy, and can use the heat obtained by photothermal conversion through the photovoltaic thermal component 1 to heat the energy storage component 2 in a low temperature environment, thereby ensuring the operating stability of the energy storage battery 22. The heated refrigerant can cool the condenser 31, and the hot water obtained by heat exchange can be used in daily life. The cooled refrigerant can cool the photovoltaic thermal component 1, thereby improving the photoelectric conversion efficiency and improving the overall utilization efficiency of the photovoltaic thermal device for solar energy.

[0090] In summary, the embodiment of the present invention also discloses a control method for a photovoltaic thermal device, which may include first obtaining the temperature value of the energy storage component 2 detected by the temperature sensor 7, then determining whether the temperature value meets the working temperature condition, and controlling the action of the reversing valve 5 according to the condition determination result. Thus, the operation stability of the energy storage battery 22 can be ensured, the heated refrigerant can cool the condenser 31, and the hot water obtained by heat exchange can be used in daily life. The cooled refrigerant can cool the photovoltaic thermal component 1, thereby improving the photoelectric conversion efficiency and improving the overall utilization efficiency of the photovoltaic thermal device for solar energy.

[0091] It should be noted that, for the method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the embodiments of the present application are not limited by the described order of actions, because according to the embodiments of the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present application.

[0092] Reference Figure 4 As shown, the embodiment of the present invention further discloses a control device for a photovoltaic thermal device, the control device comprising:

[0093] The temperature acquisition module 401 is used to acquire the temperature value of the energy storage component 2 detected by the temperature sensor 7 .

[0094] The temperature condition determination module 402 is used to determine whether the temperature value meets the working temperature condition.

[0095] The valve control module 403 is used to control the action of the reversing valve 5 according to the condition determination result.

[0096] In an optional embodiment of the invention, the valve control module 403 is further used for:

[0097] When the temperature value does not meet the working temperature condition, the reversing valve 5 is controlled to operate so that the first end 501 and the second end 502 are connected.

[0098] In an optional embodiment of the invention, the valve control module 403 is further used for:

[0099] When the temperature value meets the working temperature condition, the reversing valve 5 is controlled to operate so that the first end 501 and the third end 503 are connected.

[0100] In summary, the embodiment of the present invention also discloses a photovoltaic thermal device, a control method and a device for the photovoltaic thermal device. The embodiment of the present invention may include a photovoltaic thermal component 1, an energy storage component 2, a refrigerant circulation component 3, a water storage component 4 and a reversing valve 5. The energy storage component 2 is electrically connected to the photovoltaic thermal component 1, wherein the energy storage component 2 includes a liquid cooling inlet and a liquid cooling outlet. The refrigerant circulation component 3 is connected to the photovoltaic thermal component 1 to exchange heat with the photovoltaic thermal component 1 through a refrigerant, wherein the refrigerant circulation component 3 includes a condenser 31, and the liquid cooling outlet is connected to the condenser 31. The water storage component 4 is connected to the condenser 31 in a liquid path to exchange heat with the refrigerant in the condenser 31. The first end 501 of the reversing valve 5 is connected to the refrigerant outlet of the photovoltaic thermal component 1, the second end 502 of the reversing valve 5 is connected to the liquid cooling inlet, and the third end 503 of the reversing valve 5 is connected to the condenser 31. When the first end 501 is connected to the second end 502, the heat generated by the photovoltaic thermal component 1 is absorbed by the refrigerant, and the refrigerant after absorbing the heat passes through the energy storage component 2, heats up the energy storage component 2, and then flows to the condenser 31. When the first end 501 is connected to the third end 503, the heat generated by the photovoltaic thermal component 1 is absorbed by the refrigerant, and the refrigerant exchanges heat with the water in the water storage component 4 through the condenser 31 to condense the refrigerant. Thus, the photovoltaic power generation technology and the photothermal conversion technology can be combined to improve the utilization efficiency of solar energy, and the heat obtained by photothermal conversion can be used by the photovoltaic thermal component 1 to heat the energy storage component 2 in a low temperature environment, so as to ensure the operation stability of the energy storage battery 22, and the heated refrigerant can cool the condenser 31, and the hot water obtained by heat exchange can be used for daily life. The cooled refrigerant can cool the photovoltaic thermal component 1, so as to improve the photoelectric conversion efficiency.

[0101] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0102] It is easy for a person skilled in the art to think that any combination of the above embodiments is feasible, so any combination of the above embodiments is an implementation scheme of the present invention. However, due to space limitations, this specification will not describe them in detail here.

[0103] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0104] Similarly, it should be understood that in order to streamline the present invention and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof.

[0105] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

Claims

1. A photovoltaic thermal device, characterized in that: The device comprises: Photovoltaic thermal components (1); An energy storage component (2), the energy storage component (2) being electrically connected to the photovoltaic thermal component (1), wherein the energy storage component (2) comprises a liquid cooling inlet end and a liquid cooling outlet end; A refrigerant circulation component (3), the refrigerant circulation component (3) being in communication with the photovoltaic thermal component (1) so as to perform heat exchange with the photovoltaic thermal component (1) via a refrigerant, wherein the refrigerant circulation component (3) comprises a condenser (31), and the liquid cooling outlet is in communication with the condenser (31); A water storage component (4), the water storage component (4) being in fluid communication with the condenser (31) so as to exchange heat with the refrigerant in the condenser (31); A reversing valve (5), wherein a first end (501) of the reversing valve (5) is connected to a refrigerant outlet of the photovoltaic thermal assembly (1), a second end (502) of the reversing valve (5) is connected to a liquid cooling inlet, and a third end (503) of the reversing valve (5) is connected to the condenser (31); wherein: When the first end (501) is connected to the second end (502), the heat generated by the photovoltaic thermal component (1) is absorbed by the refrigerant, and the refrigerant that has absorbed the heat passes through the energy storage component (2), heats the energy storage component (2), and then flows to the condenser (31); When the first end (501) is connected to the third end (503), the heat generated by the photovoltaic thermal component (1) is absorbed by the refrigerant, and the refrigerant exchanges heat with the water in the water storage component (4) through the condenser (31) to condense the refrigerant.

2. The photovoltaic thermal device according to claim 1, characterized in that: The energy storage component (2) comprises: An inverter (21), the inverter (21) being electrically connected to the photovoltaic thermal assembly (1); An energy storage battery (22), the energy storage battery (22) being electrically connected to the inverter (21); A water-cooled shell is provided with a battery cavity for accommodating the energy storage battery (22), and the liquid-cooled liquid inlet and liquid-cooled liquid outlet are provided on the water-cooled shell.

3. The photovoltaic thermal device according to claim 1, characterized in that: The refrigerant circulation component (3) further comprises: A compressor (32), wherein a refrigerant inlet of the compressor (32) is connected to a refrigerant outlet of the photovoltaic thermal assembly (1) so as to compress the refrigerant flowing out of the photovoltaic thermal assembly (1), wherein the refrigerant outlet of the compressor (32) is connected to a first end (501) of the reversing valve (5); An electronic expansion valve (33), wherein the electronic expansion valve (33) is arranged between the refrigerant outlet of the condenser (31) and the refrigerant inlet of the photovoltaic thermal component (1) to throttle and reduce the pressure of the liquid-cooled refrigerant flowing out of the condenser (31), and the refrigerant after throttling and reducing the pressure flows to the photovoltaic thermal component (1) to cool the photovoltaic thermal component (1).

4. The photovoltaic thermal device according to claim 3, characterized in that: The refrigerant circulation component (3) further comprises a liquid reservoir (34), wherein the liquid reservoir (34) is located between the photovoltaic thermal component (1) and the electronic expansion valve (33).

5. The photovoltaic thermal device according to claim 3, characterized in that: The refrigerant circulation component (3) further comprises a gas-liquid separator (35), wherein the gas-liquid separator (35) is located between the photovoltaic thermal component (1) and the compressor (32).

6. The photovoltaic thermal device according to claim 1, characterized in that: The water storage component (4) comprises: Water tank (41); A water storage pipeline (42), the water tank (41) and the water storage pipeline (42) are in fluid communication, and the water storage pipeline (42) and the condenser (31) are in fluid communication; A water pump (43), wherein the water pump (43) is installed in the water storage pipe (42) so that the water in the water tank (41) forms a heat exchange cycle with the refrigerant.

7. The photovoltaic thermal device according to claim 1, characterized in that: The reversing valve (5) is an electrically driven valve, and the photovoltaic thermal device further comprises a controller (6) and a temperature sensor (7) installed on the energy storage component (2), and the temperature sensor (7) and the reversing valve (5) are electrically connected to the controller (6) respectively; The controller (6) receives the temperature value detected by the temperature sensor (7), and controls the operation of the reversing valve (5) according to the temperature value.

8. A control method for a photovoltaic thermal device, characterized in that: The photovoltaic thermal device comprises the photovoltaic thermal device according to any one of claims 1 to 7, and the control method comprises: Acquiring a temperature value of the energy storage component (2) detected by a temperature sensor (7); Determining whether the temperature value meets the operating temperature condition; The reversing valve (5) is controlled to operate according to the result of the condition determination.

9. The control method of the photovoltaic thermal device according to claim 8, characterized in that: The step of controlling the action of the reversing valve (5) according to the result of the condition determination comprises: When the temperature value does not meet the working temperature condition, the reversing valve (5) is controlled to operate so that the first end (501) and the second end (502) are connected.

10. The control method of the photovoltaic thermal device according to claim 8, characterized in that: The step of controlling the action of the reversing valve (5) according to the result of the condition determination comprises: When the temperature value meets the working temperature condition, the reversing valve (5) is controlled to operate so that the first end (501) and the third end (503) are connected.

11. A control device for a photovoltaic thermal device, characterized in that: The photovoltaic thermal device comprises the photovoltaic thermal device according to any one of claims 1 to 7, and the control device comprises: A temperature acquisition module, used for acquiring a temperature value of the energy storage component (2) detected by a temperature sensor (7); A temperature condition determination module, used to determine whether the temperature value meets the working temperature condition; The valve control module is used to control the action of the reversing valve (5) according to the result of the condition determination.

12. The control device of the photovoltaic thermal device according to claim 11, characterized in that: The valve control module is also used for: When the temperature value does not meet the working temperature condition, the reversing valve (5) is controlled to operate so that the first end (501) and the second end (502) are connected.

13. The control device of the photovoltaic thermal device according to claim 11, characterized in that: The valve control module is also used for: When the temperature value meets the working temperature condition, the reversing valve (5) is controlled to operate so that the first end (501) and the third end (503) are connected.

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