Photovoltaic photo-thermal system and intelligent agricultural greenhouse

Abstract

The utility model provides a photovoltaic photo-thermal system. The photovoltaic photo-thermal system comprises a photovoltaic assembly (1); the heat storage device (9) is used for accommodating a liquid medium for storing heat; a heat sink (28); the photovoltaic module (1), the heat storage device (9) and the radiator (28) are arranged in the heat storage device (9), the photovoltaic module (1), the heat storage device (9) and the radiator (28) are arranged in the refrigerant loop (2), and a refrigerant in the refrigerant loop can exchange heat with the photovoltaic module (1), the heat storage device (9) and the radiator (28); wherein the refrigerant loop (2) is configured to enable the refrigerant passing through the photovoltaic module (1) to switch geothermal heat exchange between the heat storage device (9) and the radiator (28), in addition, the utility model further provides an intelligent agricultural greenhouse comprising the photovoltaic and photo-thermal system, the working temperature of the photovoltaic module is reduced, the power generation efficiency of the photovoltaic module is improved, and the energy consumption of the photovoltaic module is reduced. Operation stability is improved, and simultaneous utilization of electric energy and heat energy is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of photovoltaic and solar thermal systems, and in particular to photovoltaic and solar thermal systems and intelligent agricultural greenhouses. Background Technology

[0002] In recent years, the global clean energy industry has entered a phase of rapid development, with more and more countries accelerating their energy transition. Among the many types of renewable energy, solar energy is internationally recognized as the most competitive renewable energy source for the future due to its advantages such as wide distribution, local availability, and minimal environmental impact.

[0003] my country has abundant and widely distributed solar energy resources, with more than two-thirds of the country having solar irradiance exceeding 5000 MJ / m². 2 The annual sunshine duration exceeds 2200 hours. In the field of solar power generation, the most widely used products are currently monocrystalline silicon and polycrystalline silicon photovoltaic modules. Under standard testing conditions (cell temperature 25℃, solar irradiance 1000W / m²), 2 The industrial conversion rates of monocrystalline silicon and polycrystalline silicon photovoltaic cells can reach 22% and 18%, respectively. However, under actual operating conditions, the power generation efficiency of photovoltaic cells is only 6%-15%. The main reason for this large difference in power generation efficiency is that the power generation efficiency of photovoltaic cells is negatively correlated with their temperature. Under actual operating conditions, most of the solar radiation energy absorbed by photovoltaic cells is converted into heat energy, which directly leads to a significant increase in the temperature of the photovoltaic cell module and thus a significant decrease in the power generation efficiency. Related research results show that for every 1°C increase in the temperature of a photovoltaic cell module, its power generation decreases by up to 0.5%. Utility Model Content

[0004] To overcome the aforementioned technical deficiencies, this utility model provides a photovoltaic-thermal system, comprising:

[0005] Photovoltaic modules;

[0006] A thermal storage device that contains a liquid medium for storing heat;

[0007] Radiators; and

[0008] A refrigerant circuit is provided, in which the photovoltaic module, the thermal storage device, and the radiator are arranged, and the refrigerant in the refrigerant circuit can exchange heat with the photovoltaic module, the thermal storage device, and the radiator.

[0009] The refrigerant circuit is configured such that the refrigerant passing through the photovoltaic module can be switched for geothermal exchange between the thermal storage device and the radiator.

[0010] In some embodiments, the coolant of the coolant loop flows through the back side of the photovoltaic module.

[0011] In some embodiments, when the heat storage device is full of heat, the coolant flowing through the photovoltaic module exchanges heat with the heat sink, so that the heat sink discharges heat from the photovoltaic module to the external environment.

[0012] In some embodiments, when the heat storage device is not full of heat, the coolant flowing through the photovoltaic module exchanges heat with the heat storage device.

[0013] In some embodiments, a first three-way valve and a second three-way valve are provided in the coolant loop, the port A of the first three-way valve and the port A of the second three-way valve are respectively communicated with the inlet and outlet of the coolant loop flowing through the photovoltaic module, the port B of the first three-way valve and the port B of the second three-way valve are respectively communicated with the outlet and inlet of the heat storage device, the port C of the first three-way valve and the port C of the second three-way valve are respectively communicated with the outlet and inlet of the heat sink, wherein the port A of the first three-way valve and the second three-way valve is switchably communicated between the port B of the first three-way valve and the second three-way valve and the port C of the first three-way valve and the second three-way valve.

[0014] In some embodiments, when the heat storage device is full of heat, the B port of the first three-way valve and the second three-way valve is closed, and the A and C ports of the first three-way valve and the second three-way valve are turned on; and when the heat storage device is not full of heat, the C port of the first three-way valve and the second three-way valve is closed, and the A and B ports of the first three-way valve and the second three-way valve are turned on.

[0015] In some embodiments, a system host is provided between the B port of the first three-way valve and the second three-way valve and the heat storage device, the system host comprising a compressor and a photovoltaic inverter, the compressor being used to drive the coolant to flow between the photovoltaic module and the heat storage device; and / or a pump is provided between the C port of the first three-way valve and the second three-way valve and the heat sink, the pump being used to drive the coolant to flow between the photovoltaic module and the heat sink.

[0016] In some embodiments, the photovoltaic light and heat system comprises an energy storage device for storing electrical energy from the photovoltaic module.

[0017] The utility model also provides a kind of intelligent agricultural greenhouse, comprising the photovoltaic light and heat system described above.

[0018] In some embodiments, a geothermal pipe is laid in the intelligent agricultural greenhouse, and the liquid medium in the heat storage device circulates in the geothermal pipe.

[0019] In some embodiments, the smart agricultural greenhouse comprises a duct-in machine configured to exchange heat with the refrigerant in the refrigerant circuit to blow dry hot air into the greenhouse.

[0020] In some embodiments, the smart agricultural greenhouse comprises a sensor for detecting at least one of humidity and temperature in the greenhouse.

[0021] In some embodiments, the duct-in machine is turned off when the sensor detects that the humidity is lower than a predetermined humidity or the temperature in the greenhouse is higher than a predetermined temperature; the duct-in machine is started to blow dry hot air into the greenhouse when the sensor detects that the humidity is higher than a predetermined humidity or the temperature in the greenhouse is lower than a predetermined temperature.

[0022] The photovoltaic and photo-thermal system according to the present application reduces the working temperature of the photovoltaic module, improves the power generation efficiency of the photovoltaic module, improves the stability of operation, and realizes the simultaneous utilization of electric energy and heat energy.

[0023] The photovoltaic and photo-thermal system according to the present application reduces the working temperature of the photovoltaic module, improves the power generation efficiency of the photovoltaic module, improves the stability of operation, and realizes the simultaneous utilization of electric energy and heat energy.

[0024] The photovoltaic and photo-thermal system according to the present application reduces the working temperature of the photovoltaic module, improves the power generation efficiency of the photovoltaic module, improves the stability of operation, and realizes the simultaneous utilization of electric energy and heat energy. BRIEF DESCRIPTION OF DRAWINGS

[0025] According to convention, various features of the following described drawings are not necessarily drawn to scale. The dimensions of various features and elements in the drawings can be enlarged or reduced in order to more clearly illustrate embodiments of the present application.

[0026] Figure 1 Fig. 1 is a structural schematic diagram of a photovoltaic and photo-thermal system according to an embodiment of the present application; and

[0027] Figure 2 Fig. 1 is a structural schematic diagram of a photovoltaic and photo-thermal system according to an embodiment of the present application; and

[0028] Fig. 1 is a structural schematic diagram of a photovoltaic and photo-thermal system according to an embodiment of the present application; and DETAILED DESCRIPTION

[0029] The technical solutions of the utility model will be described below in detail in connection with the drawings. The following examples are only used to make the technical solutions of the utility model clearer, and therefore only serve as examples, but cannot limit the protection scope of the utility model.

[0030] Unless otherwise defined, all technical and scientific terms used in the utility model have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs; the terms used in the utility model are only for the purpose of describing specific examples, and are not intended to limit the utility model; the terms "include" and "have" and any variations thereof in the specification and claims of the utility model and the above description of drawings are intended to cover non-exclusive inclusion.

[0031] In the description of the utility model embodiments, the technical terms "first", "second" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the utility model embodiments, the meaning of "multiple" is more than two, unless otherwise specifically limited.

[0032] In the utility model, "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the utility model. The appearance of this phrase in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described in the utility model can be combined with other embodiments.

[0033] In the description of the utility model embodiments, the term "and / or" is only used to describe the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, if the character " / " appears in the utility model, it generally means that the associated objects before and after are in an "or" relationship.

[0034] In the description of the utility model embodiments, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0035] In the description of the utility model embodiments, the term "at least one" refers to one or more than two (including two), and similarly, "at least one group" refers to one or more than two groups (including two groups), and "at least one piece" refers to one or more than two pieces (including two pieces). In the description of the utility model embodiments, the term "at least part" refers to part or all.

[0036] Unless otherwise stated, in the description of embodiments of the present application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely intended to facilitate the description of the embodiments of the present application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0037] In the description of embodiments of the present application, unless otherwise specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0038] The present application discloses a kind of photovoltaic photo-thermal system, as shown in figure Figure 1 The photovoltaic photo-thermal system includes photovoltaic module 1, heat storage device 9, radiator 28 and refrigerant circuit 2, heat storage device 9 contains heat storage medium such as water for storing heat, the photovoltaic module 1, the heat storage device 9 and the radiator 28 are arranged in the refrigerant circuit 2, the refrigerant in the refrigerant circuit can be heat exchanged with the photovoltaic module 1, the heat storage device 9 and the radiator 28, the refrigerant passing through the photovoltaic module 1 can be switched heat exchanged between the heat storage device 9 and the radiator 28, when the refrigerant that has absorbed the heat of photovoltaic module 1 is switched to heat exchange with the heat storage device 9, so that the refrigerant that has absorbed the heat of photovoltaic module 1 is heat exchanged with the heat storage medium in heat storage device 9, so that heat is stored in heat storage medium. When the refrigerant that has absorbed the heat of photovoltaic module 1 is switched to heat exchange with radiator 28, heat is dispersed to the external environment. This makes solar power generation and heating both be utilized, and the temperature of photovoltaic module can be maintained within the optimum working temperature range, which significantly improves the power generation efficiency of photovoltaic module.

[0039] In some embodiments of the present application, the circuit in the refrigerant circuit 2 flowing through the photovoltaic module 1 is located at the back side of the photovoltaic module 1. This more efficiently absorbs the heat generated when the photovoltaic module 1 is working.

[0040] In some embodiments of the utility model, if the heat storage device 9 is full of heat and does not need heat, the refrigerant flowing through the photovoltaic module 1 is switched to heat exchange with the radiator 28, so that the radiator 28 discharges heat from the photovoltaic module 1 to the external environment. This ensures that the excess heat is discharged to the external environment when heat storage is not needed and heat is not needed, ensuring that the temperature of the photovoltaic module is maintained within the optimal working temperature range.

[0041] In some embodiments of the utility model, if the heat storage device 9 is not full of heat, the refrigerant flowing through the photovoltaic module 1 is switched to heat exchange with the heat storage device 9. This collects heat from the photovoltaic module 1 and stores it in the heat storage device 9 for recycling.

[0042] In some embodiments of the utility model, as shown in Figure 1 In order to switch the refrigerant flowing through the photovoltaic module 1 between the heat storage device 9 and the radiator 28, a first three-way valve 29 and a second three-way valve 30 are provided in the refrigerant circuit 2, the port A of the first three-way valve 29 and the port A of the second three-way valve 30 are respectively communicated with the inlet and outlet of the refrigerant circuit flowing through the photovoltaic module 1, the port B of the first three-way valve 29 and the port B of the second three-way valve 30 are respectively communicated with the outlet and inlet of the heat storage device 9, the port C of the first three-way valve 29 and the port C of the second three-way valve 30 are respectively communicated with the outlet and inlet of the radiator 28, wherein the port A of the first three-way valve 29 and the second three-way valve 30 is switchably fluidly connected between the port B of the first three-way valve 29 and the second three-way valve 30 and the port C of the first three-way valve 29 and the second three-way valve 30. In the case that the heat storage device 9 is full of heat, the B port of the first three-way valve 29 and the second three-way valve 30 is closed, and the A and C ports of the first three-way valve 29 and the second three-way valve 30 are turned on; in the case that the heat storage device 9 is not full of heat, the C port of the first three-way valve 29 and the second three-way valve 30 is closed, and the A and B ports of the first three-way valve 29 and the second three-way valve 30 are turned on.

[0043] In some embodiments of the utility model, as shown in Figure 1 A system host 7 is provided between the B port of the first three-way valve 29 and the second three-way valve 30 and the heat storage device 9, the system host includes a compressor and a photovoltaic inverter, and the compressor is used to drive the refrigerant to flow between the photovoltaic module 1 and the heat storage device 9.

[0044] In some embodiments of the utility model, as shown in Figure 1As shown, a pump 27 is arranged between the C ports of the first and second three-way valves 29 and 30 and the radiator 28, and the pump is used to drive the refrigerant to flow between the photovoltaic module 1 and the radiator 28, so as to facilitate heat exchange between the refrigerant and the photovoltaic module 1 and the radiator 28. When the heat in the heat storage device 9 reaches an upper limit and the heat cannot be consumed, the system detects the useless heat demand and automatically switches to the heat dissipation mode, the A and C ports of the first and second three-way valves are turned on, the pump 27 is started to circulate the refrigerant in the refrigerant circuit, and the heat behind the photovoltaic module is taken to the fins of the radiator, and the fan makes the heat dissipate quickly, so that the efficiency of photovoltaic power generation can be improved even when no heat is needed.

[0045] In some embodiments of the present application, the photovoltaic light heat system comprises an energy storage device 8 connected to the photovoltaic inverter in the main system, used to store the electric energy from the photovoltaic module 1, and supply power to the power equipment when needed. The photovoltaic light heat system not only meets its own power and heat demand, but also stores the excess electricity and heat, which can be used in insufficient light or at night, achieving zero carbon emission.

[0046] As shown in the accompanying drawings, Figure 2 The present application also provides an intelligent agricultural greenhouse comprising the above photovoltaic light heat system. The present application can improve the utilization efficiency of solar energy. The traditional photovoltaic system only utilizes the electric energy generated by photovoltaic power generation, and a large amount of heat is wasted. The present application can improve the efficiency of photovoltaic power generation all day round, and collect and utilize the heat of the photovoltaic module, thereby improving the overall utilization efficiency of solar energy, and can be widely applied to agricultural scenes such as greenhouse planting or breeding.

[0047] In some embodiments of the present application, as shown in the accompanying drawings, Figure 2 In some embodiments of the present application, as shown in the accompanying drawings, When the photovoltaic module receives sunlight, the photovoltaic module generates current through the photovoltaic effect, and the photovoltaic inverter in the system main machine converts the direct current into alternating current or directly supplies direct current to the load through the direct current bus. If the load power consumption is less than the photovoltaic power generation, the excess electricity will be fed into the grid. The backplane temperature of the photovoltaic module will continue to rise, and can usually reach about 60 DEG C. The A and B ports of the first and second three-way valves are turned on, the compressor in the system main machine is started, the refrigerant in the refrigerant circuit takes away the heat behind the photovoltaic module, and the heat is stored in the heat storage medium in the heat storage device. When the greenhouse needs heat, the heat storage medium flows through the underground floor heating pipe to heat the greenhouse, and the dry hot air blown out by the indoor unit through the air pipe can also play the role of heating and dehumidifying.

[0048] In some embodiments of the present application, as shown in Figure 2 The agricultural greenhouse includes a ducted air conditioner 10, which can exchange heat with refrigerant in the refrigerant circuit 2 to blow dry hot air into the greenhouse to achieve the purpose of heating and dehumidification, so as to adjust the temperature and humidity of the greenhouse. The entire photovoltaic light and heat system can be automatically and intelligently controlled, saving labor and operation and maintenance costs.

[0049] In some embodiments of the present application, as shown in Figure 2 The intelligent agricultural greenhouse includes a sensor for detecting at least one of the humidity and temperature in the greenhouse to monitor the greenhouse environment in real time. If the sensor detects that the humidity is higher than the predetermined humidity or the temperature in the greenhouse is lower than the predetermined temperature, the ducted air conditioner 10 is started to blow dry hot air into the greenhouse, which is beneficial to the greenhouse in a constant temperature and humidity state.

[0050] The foregoing description illustrates and describes some example embodiments. Various additions, modifications, changes, etc. can be made to these example embodiments without departing from the spirit and scope of the present application. It is intended that all matter contained in the above description, or shown in the accompanying drawings, be interpreted as illustrative and not in a limiting sense. In addition, the present application only shows and describes selected embodiments of the present application, but the present application can be used in various other combinations, modifications and environments and can be changed or modified within the scope of the inventive concept as expressed herein, in accordance with the above teachings, and / or within the skill or knowledge of those skilled in the relevant art. Furthermore, certain features and characteristics of each embodiment can be selectively interchanged and applied to other illustrated and non-illustrated embodiments of the present application.

Claims

1. A photovoltaic-thermal system, comprising: Photovoltaic module (1); A heat storage device (9) contains a liquid medium for storing heat; Radiator (28); and The photovoltaic module (1), the heat storage device (9) and the radiator (28) are arranged in the refrigerant circuit (2), and the refrigerant in the refrigerant circuit can exchange heat with the photovoltaic module (1), the heat storage device (9) and the radiator (28); The refrigerant circuit (2) is configured such that the refrigerant passing through the photovoltaic module (1) can be switched between the thermal storage device (9) and the radiator (28) for geothermal exchange.

2. The photovoltaic-thermal system according to claim 1, wherein the refrigerant in the refrigerant circuit (2) flows through the back side of the photovoltaic module (1).

3. The photovoltaic thermal system according to claim 1, wherein when the heat storage device (9) is full of heat, the refrigerant flowing through the photovoltaic module (1) exchanges heat with the radiator (28) so that the radiator (28) discharges the heat from the photovoltaic module (1) to the external environment.

4. The photovoltaic thermal system according to claim 1, wherein when the heat storage device (9) is not full of heat, the refrigerant flowing through the photovoltaic module (1) exchanges heat with the heat storage device (9).

5. The photovoltaic thermal system according to claim 3 or 4, wherein a first three-way valve (29) and a second three-way valve (30) are provided in the refrigerant circuit (2), the port A of the first three-way valve (29) and the port A of the second three-way valve (30) are respectively connected to the inlet and outlet of the refrigerant circuit flowing through the photovoltaic module (1), the port B of the first three-way valve (29) and the port B of the second three-way valve (30) are respectively connected to the outlet and inlet of the heat storage device (9), the port C of the first three-way valve (29) and the port C of the second three-way valve (30) are respectively connected to the outlet and inlet of the radiator (28), wherein the port A of the first three-way valve (29) and the second three-way valve (30) is switchably connected to the port B of the first three-way valve (29) and the port C of the first three-way valve (29) and the second three-way valve (30); When the heat storage device (9) is full of heat, the B port of the first three-way valve (29) and the second three-way valve (30) is closed, and the A and C ports of the first three-way valve (29) and the second three-way valve (30) are open; and When the heat storage device (9) is not fully filled with heat, the C port of the first three-way valve (29) and the second three-way valve (30) are closed, and the A and B ports of the first three-way valve (29) and the second three-way valve (30) are open.

6. The photovoltaic-thermal system according to claim 5, wherein, A system host (7) is provided between the B port of the first three-way valve (29) and the second three-way valve (30) and the thermal storage device (9). The system host includes a compressor and a photovoltaic inverter. The compressor is used to drive the refrigerant to flow between the photovoltaic module (1) and the thermal storage device (9); and / or A pump (27) is provided between the C port of the first three-way valve (29) and the second three-way valve (30) and the radiator (28), the pump being used to drive the refrigerant to flow between the photovoltaic module (1) and the radiator (28).

7. The photovoltaic-thermal system according to claim 1, comprising an energy storage device (8) for storing electrical energy from the photovoltaic module (1).

8. An intelligent agricultural greenhouse, comprising a photovoltaic and photothermal system according to any one of claims 1-7.

9. The intelligent agricultural greenhouse according to claim 8, wherein geothermal pipes (12) are laid in the intelligent agricultural greenhouse, and the liquid medium in the heat storage device (9) circulates in the geothermal pipes.

10. The intelligent agricultural greenhouse according to claim 8, comprising an indoor unit (10) in a duct, the indoor unit (10) being configured to exchange heat with the refrigerant in the refrigerant circuit (2) to blow dry hot air into the greenhouse.

11. The intelligent agricultural greenhouse of claim 10, comprising a sensor for detecting at least one of humidity and temperature in the greenhouse.

12. The intelligent agricultural greenhouse according to claim 11, wherein, When the sensor detects that the humidity is higher than a predetermined humidity or the temperature inside the greenhouse is lower than a predetermined temperature, the air duct unit (10) is activated to blow dry hot air into the greenhouse.

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