Partition temperature difference power generation sunshade net based on radiation refrigeration

Abstract

The utility model discloses a partition temperature difference power generation sunshade net based on radiation refrigeration, including sunshade net, MPPT controller and energy storage battery, one end of sunshade net is connected with core pipe, be equipped with temperature difference power generation device in the core pipe, the cold area and hot area of long strip shape are alternately arranged on the sunshade net, the upper surface of the sunshade net of cold area is coated with radiation refrigeration coating, the lower surface of the cold area and hot area of sunshade net is attached to the strip copper foil, the end of strip copper foil is vertically fixed with copper sheet, the copper sheet of adjacent cold area and hot area is a group, every group connects a temperature difference power generation piece, a plurality of temperature difference power generation pieces are divided into a plurality of groups, and the temperature difference power generation piece in every group is in turn connected in series, and every group temperature difference power generation piece is connected in parallel between wire no. One and wire no. Two, wire no. One and wire no. Two are connected with external MPPT controller, energy storage battery, the utility model discloses the traditional sunshade net is combined with radiation refrigeration, temperature difference power generation technology, realizes sunshade and dual -purpose of power generation, especially suitable for agricultural greenhouse and other outdoor scenes.

Description

Technical Field

[0001] This utility model relates to the field of shading net technology, and in particular to a zoned temperature difference power generation shading net based on radiation cooling. Background Technology

[0002] Shading nets are commonly used in agricultural greenhouses and building shading applications. Traditional shading nets are mainly woven from polyethylene or polypropylene. They reduce solar radiation heat through high reflectivity or shading rate (usually 30%-90%), thus playing a role in heat insulation. In high-temperature environments in summer, the temperature of their black heat-absorbing surface can reach over 60°C. However, this part of the heat energy is not effectively utilized. This type of design is essentially an "energy-wasting solution" that cannot convert abundant environmental heat energy into usable energy. It has a single function and low resource utilization rate.

[0003] Radiation-cooling coatings are coating materials that achieve cooling without electricity consumption by reflecting sunlight (400-2500 nm band) and radiating heat through the mid-infrared atmospheric window (8-13 μm band). Their core function stems from the synergistic effect of high solar reflectivity (≥94%) and high infrared emissivity (≥90%), which can lower the surface temperature of objects to below ambient temperature (experiments have shown it to be more than 15°C below ambient temperature). Although this technology has been applied in building cooling, its energy conversion value has long been overlooked. The temperature difference between the coating and the environment is essentially thermodynamic potential energy, but current technologies only use it for cooling without integrating it with energy harvesting devices, failing to achieve synergistic utilization of "cooling-power generation."

[0004] While thermoelectric power generation (TEG) technology is mature and used for waste heat recovery in industrial equipment (such as engines and boilers), its application is limited to rigid, high-temperature heat sources (>100℃). Flexible shading structures, due to their small temperature difference, large curvature, and dispersed heat sources, are difficult to directly adapt to traditional TEG modules. This technology is still lacking in distributed low-grade thermal energy scenarios (such as agricultural facilities).

[0005] To address the three major problems of traditional shade nets—wasted heat energy, lack of integration of radiative cooling and power generation, and the lack of application of thermoelectric power generation in flexible scenarios—our school aims to design a shade net for agricultural applications using thermoelectric power generation technology. Summary of the Invention

[0006] To overcome the above deficiencies, this utility model provides a zoned thermoelectric power generation shading net based on radiation cooling, which applies thermoelectric power generation technology to a flexible shading net, filling the gap in the application of thermoelectric power generation technology in the field of agricultural facilities.

[0007] This utility model is achieved through the following technical solution: A zoned thermoelectric power generation shading net based on radiative cooling includes a shading net, an MPPT controller, and an energy storage battery. One end of the shading net is connected to a core tube, which houses a thermoelectric power generation device. The shading net has alternating long strips of cold and hot zones. The upper surface of the shading net in the cold zones is coated with a radiative cooling coating, and strips of copper foil are attached to the lower surfaces of the cold and hot zones. The core tube includes a cap, a lower arc tube, and an upper arc tube. A limiting groove is provided on the lower arc tube, and a limiting strip is provided on the upper arc tube. The upper arc tube is clamped onto the lower arc tube, and the tube cap is fastened to both ends of the core tube. A strip-shaped slit is provided on the lower arc tube. The shading net and the strip-shaped copper foil extend into the core tube through the strip-shaped slit. A limiting rod is fixed to the shading net extending into the core tube. The strip-shaped copper foil inside the core tube is separated from the shading net and is not wrapped around the limiting rod. The strip-shaped copper foil inside the core tube is connected to the thermoelectric generator.

[0008] In a further optimized manner, the thermoelectric generator includes a first conductor, a second conductor, and several thermoelectric generator plates. The strip-shaped copper foil extends into the core tube, and a copper sheet is vertically fixed to the end of the strip-shaped copper foil extending into the core tube. The copper sheets of adjacent cold and hot zones form a group, and each group is connected to a thermoelectric generator plate. The copper sheet of the cold zone is connected to the cold end of the thermoelectric generator plate, and the copper sheet of the hot zone is connected to the hot end of the thermoelectric generator plate. The several thermoelectric generator plates are divided into several groups, and the thermoelectric generator plates in each group are connected in series. Each group of thermoelectric generator plates is connected in parallel between the first conductor and the second conductor.

[0009] In a further optimized manner, the first and second wires are connected to the MPPT controller and energy storage battery outside the core tube.

[0010] Further optimized, the shading net is provided with alternating cold and hot zones in a width ratio of 1:1.2. The cold zones are coated with a radiative cooling material with a coating thickness of 0.5 mm, and the overall thickness of the shading net is 1.5 mm.

[0011] Further optimized, the width of the cold zone of the shading net is 2-4cm, the width of the hot zone is 2.4-4.8cm, and 5-8 thermoelectric generators are connected in series as a group, with 6-10 groups of thermoelectric generators connected in parallel in each core tube.

[0012] Further optimized, the hot zone of the shade net is a light-transmitting zone with a porosity of 0.3-0.5, and the cold zone of the shade net is an opaque zone.

[0013] Further optimized, the shade net is woven from polyethylene or polyester, and the radiative cooling material in the cold zone of the shade net is a SiO2 / TiO2 composite material.

[0014] Further optimized, it also includes a pressing frame, on which the thermoelectric generator is embedded. Pressure plates are hinged to the pressing frame at the top and bottom of the thermoelectric generator. The top pressure plate is hinged to the right side, and the bottom pressure plate is hinged to the left side. An elastic rubber layer is adhered to the inner wall of the pressure plate.

[0015] Further optimized, ear plates are fixed to the rear sides of the two pressure plates, and locking posts are fixed to the inner walls of the ear plates. The pressing frame is provided with locking grooves that match the locking posts, and notches are provided at the top and bottom of the rear frame wall of the pressing frame.

[0016] In a further optimized configuration, the cold end of the thermoelectric generator faces downward and the hot end faces upward. Both the cold and hot ends of the thermoelectric generator are coated with thermally conductive silicone grease. The copper sheet connecting the cold and hot areas of the shading net is attached to the thermally conductive silicone grease on the cold and hot ends of the thermoelectric generator, and then pressed and fixed by a pressure plate.

[0017] The beneficial effects of this utility model are: This invention combines traditional shade nets with radiant cooling and thermoelectric power generation technologies to achieve dual functions of shading and power generation. It is especially suitable for outdoor scenarios such as agricultural greenhouses, and can continuously output usable electrical energy without the need for additional cables.

[0018] In this invention, a radiation-cooling coating is applied in alternating stripes to a flexible shading net substrate. Under sunlight, the coated and uncoated areas form cold and hot zones, with a significant temperature difference of approximately 15°C or more between adjacent cold and hot zones. Functionalized heat-collecting copper foils are attached to the lower surfaces of the cold and hot zones of the shading net. One end of the copper foil in the cold and hot zones is connected to the cold and hot ends of a thermoelectric generator, respectively, to achieve thermoelectric power generation. The thermoelectric generators are divided into several groups, and power is collected through a series and parallel connection. This, combined with an MPPT controller and an energy storage battery, enables stable power generation and storage.

[0019] This innovative design utilizes a core tube to integrate the thermoelectric generator. The thermoelectric generator and circuitry are integrated within the core tube, making it less prone to damage. A strip-shaped slit is formed on the core tube, and one end of the shading net is fixed inside the core tube with a limiting rod. The shading net can be rolled up around the core tube without affecting its opening and closing. Simultaneously, the open end of the shading net can be freely cut to suit practical use without damage affecting normal power generation.

[0020] This utility model also innovatively adopts a hinged pressing structure, in which the thermoelectric generator is embedded in the pressing frame, and the copper sheet connecting the cold zone and the hot zone is connected to the thermoelectric generator through the pressing structure. This makes assembly convenient during production and facilitates regular maintenance of the thermoelectric generator. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0022] Figure 2 for Figure 1 Enlarged diagram of point A in the middle.

[0023] Figure 3 for Figure 2 Enlarged diagram of point B in the middle.

[0024] Figure 4 This is a schematic diagram showing the distribution of copper foil, copper sheet, and thermoelectric generator in this utility model.

[0025] Figure 5 This is an enlarged schematic diagram of the end of the shade net in this utility model.

[0026] Figure 6 This is an enlarged schematic diagram of the interior of the core tube in this utility model.

[0027] Figure 7 This is an enlarged schematic diagram of the end where the shading net connects to the thermoelectric generator in this utility model.

[0028] Figure 8 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 .

[0029] Figure 9 This is a three-dimensional structural diagram of the medium-voltage frame and thermoelectric generator of this utility model. Figure 1 .

[0030] Figure 10 This is a three-dimensional structural diagram of the medium-voltage frame and thermoelectric generator of this utility model. Figure 2 .

[0031] Figure 11 This is a three-dimensional structural diagram of the thermoelectric generator connected to the copper sheet and copper foil in this utility model.

[0032] In the diagram: 1. Shading net; 11. Hot zone; 12. Cold zone; 2. Radiative cooling coating; 3. Core tube; 31. Upper arc tube; 311. Limiting strip; 32. Lower arc tube; 321. Limiting groove; 322. Strip gap; 33. Tube cap; 4. Copper foil; 5. Copper sheet; 6. Thermoelectric generator; 601. Hot end; 602. Cold end; 61. Pressing frame; 62. Pressure plate; 63. Notch; 64. Ear plate; 65. Slot; 66. Locking post; 71. Wire one; 72. Wire two; 8. Limiting rod. Detailed Implementation

[0033] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. In the description of this invention, it should be noted that the terms "left," "right," "front," "rear," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0034] like Figure 1 , 2 As shown in Figures 7 and 8, this utility model provides a zoned thermoelectric power generation shading net 1 based on radiative cooling, including a shading net 1, an MPPT controller, and an energy storage battery. One end of the shading net 1 is connected to a core tube 3, and a thermoelectric power generation device is installed inside the core tube 3. Long strip-shaped cold zones 12 and hot zones 11 are alternately arranged on the shading net 1. The upper surface of the shading net 1 in the cold zone 12 is coated with a radiative cooling coating 2. Strip-shaped copper foil 4 is attached to the lower surface of the cold zone 12 and the hot zone 11 of the shading net 1. The copper foil attached to the shading net will not affect the winding of the shading net. It should be noted that adjacent copper foils do not contact each other to avoid heat transfer between the cold zone and the hot zone. The copper foil can be anodized black copper foil.

[0035] like Figure 2 , 3 As shown in Figure 6, the core tube 3 includes a tube cap 33, a lower arc tube 32, and an upper arc tube 31. A limiting groove 321 is formed on the lower arc tube 32, and a limiting strip 311 is provided on the upper arc tube 31. The upper arc tube 31 is secured to the lower arc tube 32, and the tube cap 33 is fastened to both ends of the core tube 3. This modular core tube design facilitates assembly during production and subsequent maintenance. The limiting strip of the upper arc tube is inserted from one end of the limiting groove in the lower arc tube for securing. The tube cap, fastened to both ends of the core tube, also provides external tension to the upper and lower arc tubes.

[0036] like Figure 2 , 3 As shown in Figure 6, a strip-shaped slit 322 is provided on the lower arc tube 32. The shading net 1 and the strip-shaped copper foil 4 extend into the core tube 3 through the strip-shaped slit 322. A limiting rod 8 is wound and fixed around the shading net 1 that extends into the core tube 3. The strip-shaped copper foil 4 inside the core tube 3 is separated from the shading net 1 and is not wound around the limiting rod 8. The strip-shaped copper foil 4 inside the core tube 3 is connected to the thermoelectric generator 6 through a copper sheet 5. The function of the limiting rod 8 is to restrict one end of the shading net inside the core tube, but does not affect the connection between the copper foil and the thermoelectric generator.

[0037] like Figure 2 , 3As shown in Figures 4, 6, and 7, the thermoelectric discharge device includes a first wire 71, a second wire 72, and several thermoelectric generators 6. The strip-shaped copper foil 4 extends into the core tube 3, and a copper sheet 5 is fixed to the end of the strip-shaped copper foil 4 extending into the core tube 3. The copper sheets 5 of adjacent cold zones 12 and hot zones 11 are grouped together, and each group is connected to a thermoelectric generator 6. The copper sheet 5 of cold zone 12 is connected to the cold end 602 of thermoelectric generator 6, and the copper sheet 5 of hot zone 11 is connected to the hot end 601 of thermoelectric generator 6. The several thermoelectric generators 6 are divided into several groups, and the thermoelectric generators 6 in each group are connected in series. Each group of thermoelectric generators 6 is connected in parallel between the first wire 71 and the second wire 72. The first wire 71 and the second wire 72 are connected to an external MPPT controller and energy storage battery. The temperature difference between the cold and hot zones of the shading net is transferred to the thermoelectric generator through copper foil. The thermoelectric generator converts heat energy into electrical energy based on the Seebeck effect, realizing thermoelectric power generation. Stable output is achieved through series connection within a group and parallel connection of multiple groups, avoiding the impact of power generation due to damage to a certain component.

[0038] As a preferred implementation method, such as Figure 5 As shown, the shade net 1 features alternating cold zones 12 and hot zones 11 with a width ratio of 1:1.2. The wider hot zones ensure the light transmittance of the shade net. The cold zones 12 are coated with a radiative cooling material with a coating thickness of 0.5 mm. It should be noted that the coating will cover the pores of the shade net. The hot zones can also be selectively coated with a heat-absorbing coating, but the coating in the hot zones must not cover the pores. The overall thickness of the shade net 1, including the coating, is 1.5 mm.

[0039] In a preferred embodiment, the width of the cold zone 12 of the shade net 1 is 2-4 cm, and the width of the hot zone 11 is 2.4-4.8 cm. Every 5-8 thermoelectric generators 6 are connected in series as a group, and 6-10 groups of thermoelectric generators 6 are connected in parallel within each core tube 3. In practice, the width of a roll of shade net is approximately 2-2.5 m. It is connected from the core tube via wire one and wire two. When used in agricultural greenhouses, multiple rolls can be used together, connected in parallel for power supply or energy storage. The length of the open end of the shade net can be cut as needed without affecting its normal power generation.

[0040] In a preferred embodiment, the shade net 1 is woven from polyethylene or polyester, the radiation cooling material of the cold zone 12 of the shade net 1 is a SiO2 / TiO2 composite material, the hot zone 11 of the shade net 1 is a light-transmitting area with a porosity of 0.3-0.5, and the cold zone 12 of the shade net 1 is an opaque area that reflects sunlight and efficiently radiates in the 8-13 μm band.

[0041] As a preferred implementation method, such as Figure 9 , 10As shown in Figure 11, the device also includes a pressing frame 61. The thermoelectric generator 6 is embedded in the pressing frame 61. Pressure plates 62 are hinged to both the top and bottom of the pressing frame 61. The top pressure plate 62 is hinged to the right side, and the bottom pressure plate 62 is hinged to the left side. These, along with copper sheets perpendicular to the copper foil, clamp the copper sheets from both sides. An elastic rubber layer is adhered to the inner wall of the pressure plate 62 to ensure stable clamping. The copper sheet is thicker than the copper foil and is fixedly connected perpendicularly to the copper foil. The copper sheet is easier to press and clamp than the copper foil.

[0042] As a preferred implementation method, such as Figure 9 , 10 As shown in Figure 11, ear plates 64 are fixed to the rear sides of the two pressure plates 62. A locking post 66 is fixed to the inner wall of the ear plate 64. The pressing frame 61 has a locking groove 65 that matches the locking post 66. Two or more locking posts can be provided, with their heights increasing or decreasing sequentially to facilitate insertion into the locking groove. Corresponding protrusions and recesses are provided on the locking posts and the locking groove to make the pressing and locking more stable. Notches 63 are provided at the top and bottom of the rear frame wall of the pressing frame. These notches remove a portion of one side of the frame, and the locking groove is located here to facilitate the unobstructed insertion of vertical copper sheets into the pressing frame. The locking posts, in conjunction with the notches, limit the copper sheets, preventing them from coming out and making the connection more stable.

[0043] In a preferred embodiment, the cold end 602 of the thermoelectric generator 6 faces upward and the hot end 601 faces downward. Both the cold end 602 and the hot end 601 of the thermoelectric generator 6 are coated with thermally conductive silicone grease. The copper sheet 5 connecting the cold zone 12 and the hot zone 11 of the shading net 1 is attached to the thermally conductive silicone grease on the cold end 602 and the hot end 601 of the thermoelectric generator 6, respectively, and is pressed and fixed by the pressure plate 62. The thermally conductive silicone grease makes the connection more uniform and sufficient. The detachable connection of the thermally conductive silicone grease and the pressing frame facilitates later maintenance.

[0044] The positions of the MPPT controller and the energy storage battery controller are set by the staff according to the actual situation during operation. The MPPT controller is used to detect DC voltage and output current to ensure maximum output power.

[0045] All aspects not detailed in this utility model are well-known to those skilled in the art. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A zoned thermoelectric power generation shading net based on radiative cooling, comprising a shading net, an MPPT controller, and an energy storage battery, characterized in that: One end of the shading net is connected to a core tube, inside which a thermoelectric generator is installed. The shading net has alternating long, narrow cold and hot zones. The upper surface of the cold zones is coated with a radiative cooling coating, and strips of copper foil are attached to the lower surfaces of the cold and hot zones. The core tube includes a cap, a lower arc tube, and an upper arc tube. The lower arc tube has a limiting groove, and the upper arc tube has a limiting strip. The upper arc tube is engaged with the lower arc tube, and the cap is fastened to both ends of the core tube. The lower arc tube has a strip-shaped slit. The shading net and the strip-shaped copper foil extend into the core tube through the strip-shaped slit. The shading net extending into the core tube is wrapped and fixed with a limiting rod. The strip-shaped copper foil inside the core tube is separated from the shading net and is not wrapped on the limiting rod. The strip-shaped copper foil inside the core tube is connected to the thermoelectric generator.

2. The zoned thermoelectric power generation shading net based on radiative cooling according to claim 1, characterized in that: The thermoelectric generator includes a first conductor, a second conductor, and several thermoelectric generators. The strip of copper foil extends into the core tube, and a copper sheet is vertically fixed to the end of the strip of copper foil extending into the core tube. The copper sheets of adjacent cold and hot zones form a group, and each group is connected to a thermoelectric generator. The copper sheet of the cold zone is connected to the cold end of the thermoelectric generator, and the copper sheet of the hot zone is connected to the hot end of the thermoelectric generator. The several thermoelectric generators are divided into several groups, and the thermoelectric generators in each group are connected in series. Each group of thermoelectric generators is connected in parallel between the first conductor and the second conductor.

3. The zoned thermoelectric power generation shading net based on radiative cooling according to claim 2, characterized in that: The first and second wires are connected to the MPPT controller and energy storage battery outside the core tube.

4. The zoned thermoelectric power generation shading net based on radiative cooling according to claim 1, characterized in that: The shading net is alternately set with cold and hot zones in a width ratio of 1:1.

2. The cold zones are coated with a radiative cooling material with a coating thickness of 0.5 mm, and the overall thickness of the shading net is 1.5 mm.

5. The zoned thermoelectric power generation shading net based on radiative cooling according to claim 4, characterized in that: The width of the cold zone of the shading net is 2-4cm, and the width of the hot zone is 2.4-4.8cm. Every 5-8 thermoelectric generators are connected in series as a group, and 3-8 groups of thermoelectric generators are connected in parallel in each core tube.

6. The zoned thermoelectric power generation shading net based on radiative cooling according to claim 5, characterized in that: The hot zone of the shade net is a light-transmitting area with a porosity of 0.3-0.5, while the cold zone of the shade net is an opaque area.

7. The zoned thermoelectric power generation shading net based on radiative cooling according to claim 6, characterized in that: The shade net is woven from polyethylene or polyester, and the radiative cooling material in the cold zone of the shade net is a SiO2 / TiO2 composite material.

8. The zoned thermoelectric power generation shading net based on radiative cooling according to claim 1, characterized in that: It also includes a pressing frame, on which the thermoelectric generator is embedded. Pressure plates are hinged to the pressing frame at the top and bottom of the thermoelectric generator. The top pressure plate is hinged to the right side and the bottom pressure plate is hinged to the left side. An elastic rubber layer is adhered to the inner wall of the pressure plate.

9. The zoned thermoelectric power generation shading net based on radiative cooling according to claim 8, characterized in that: Ear plates are fixed to the rear sides of the two pressure plates, and locking pins are fixed to the inner walls of the ear plates. The pressing frame has a locking groove that matches the locking pins, and notches are opened at the top and bottom of the rear frame wall of the pressing frame.

10. The zoned thermoelectric power generation shading net based on radiative cooling according to claim 9, characterized in that: The cold end of the thermoelectric generator faces downward and the hot end faces upward. Both the cold and hot ends of the thermoelectric generator are coated with thermally conductive silicone grease. The copper sheet connecting the cold and hot areas of the shading net is attached to the thermally conductive silicone grease on the cold and hot ends of the thermoelectric generator and fixed by pressing with a pressure plate.

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