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CN-117276386-B - Photovoltaic module with double passive auxiliary cooling and surface hydrophobic functions

CN117276386BCN 117276386 BCN117276386 BCN 117276386BCN-117276386-B

Abstract

The invention discloses a photovoltaic module with double passive auxiliary cooling and surface water draining functions, which comprises a photovoltaic module body, a radiation refrigerating layer with light transmittance, a moisture absorption hydrogel and a moisture absorption hydrogel, wherein the radiation refrigerating layer with light transmittance is arranged on a light-facing surface of the photovoltaic module body, the surface of the radiation refrigerating layer with light transmittance, which is away from the photovoltaic module body, is provided with a microstructure, and the moisture absorption hydrogel is arranged on a backlight surface of the photovoltaic module body. The photovoltaic module provided by the invention realizes a certain degree of cooling effect through the radiation refrigerating layer with light transmittance on the surface, has a better self-cleaning effect on dirt such as dust by utilizing the hydrophobicity of the microstructure on the surface of the radiation refrigerating layer, and can realize a good cooling effect on the photovoltaic module by utilizing the moisture evaporation cooling effect of moisture absorption hydrogel arranged on the back of the photovoltaic module in daytime.

Inventors

  • FU HUIDE
  • WANG BEN
  • Yang Yongpu

Assignees

  • 深圳大学

Dates

Publication Date
20260505
Application Date
20231013

Claims (5)

  1. 1. A photovoltaic module having dual passive auxiliary cooling and surface hydrophobic functions, comprising: a photovoltaic module body; The photovoltaic module comprises a photovoltaic module body, a radiation refrigerating layer with light transmittance, a micro-structure and a light source, wherein the radiation refrigerating layer with light transmittance is arranged on a light-facing surface of the photovoltaic module body; The moisture absorption hydrogel is arranged on the backlight surface of the photovoltaic module body; the radiation refrigeration layer with light transmittance comprises a polydimethylsiloxane film; The thickness of the radiation refrigeration layer with light transmittance is 100-300 mu m; The preparation method of the moisture absorption hydrogel comprises the following steps: dispersing acrylamide, calcium chloride powder, an initiator and a cross-linking agent into water to obtain a precursor solution; Adding porous silicon carbide into the precursor liquid, carrying out ultrasonic treatment, adding tetramethyl ethylenediamine into the precursor liquid, and curing to obtain the moisture-absorbing hydrogel; the mass ratio of the acrylamide to the calcium chloride powder to the water is 1:1-3:4-8; And carrying out plasma treatment on the polydimethylsiloxane film, and carrying out fluorination treatment on the microstructure on the surface of the polydimethylsiloxane film subjected to plasma treatment by adopting a fluorination reagent to obtain the hydrophobic polydimethylsiloxane film.
  2. 2. The photovoltaic module with dual passive auxiliary cooling and surface hydrophobic functions according to claim 1, wherein the radiation refrigeration layer with light transmittance has infrared heat radiation capability in a spectrum band of 8-13 μm.
  3. 3. The photovoltaic module with dual passive auxiliary cooling and surface hydrophobic functions according to claim 1, wherein the preparation method of the polydimethylsiloxane film comprises the following steps: Providing a mold with a microstructure on the surface; Providing a mixed solution containing polydimethylsiloxane and a curing agent; and coating the mixed solution on the surface of the die, and drying and demolding to obtain the polydimethylsiloxane film.
  4. 4. The photovoltaic module with double passive auxiliary cooling and surface hydrophobic functions according to claim 3, wherein the fluorination treatment is performed on the microstructure of the polydimethylsiloxane film surface after the plasma treatment by using a fluorination reagent to obtain a hydrophobic polydimethylsiloxane film, and the photovoltaic module specifically comprises: Mixing 1H, 2H-perfluoro decyl trichlorosilane with normal hexane to obtain a fluorination reagent; uniformly spraying the fluorination reagent on the microstructure of the surface of the polydimethylsiloxane film after plasma treatment until the polydimethylsiloxane film swells; And placing the swelled polydimethylsiloxane film in a sealed container, taking out after a period of time, and standing to obtain the hydrophobic polydimethylsiloxane film.
  5. 5. The photovoltaic module with dual passive auxiliary cooling and surface hydrophobic functions according to claim 4, wherein the volume ratio of n-hexane to 1h,2 h-perfluorodecyl trichlorosilane is 2000-3000:1.

Description

Photovoltaic module with double passive auxiliary cooling and surface hydrophobic functions Technical Field The invention relates to the technical field of photovoltaics, in particular to a photovoltaic module with double passive auxiliary cooling and surface hydrophobic functions. Background At present, the cooling method for the photovoltaic cell mainly comprises two modes of air cooling and water cooling. The air cooling is simple in structure and most economical, but the cooling effect is not ideal, heat is released into the surrounding air, if the heat cannot be timely diffused, the temperature of the surrounding environment is increased, the cooling effect is further affected, the water cooling effect is relatively good, meanwhile, hot water can be recycled, but the water cooling structure is complex, the cooling cost is high, the water consumption is large, and the air cooling device is not suitable for large-scale photovoltaic cooling. Passive radiation refrigeration technology for self-cooling by emitting thermal radiation to the very low temperature environment (about 3K) of outer space has received attention in recent years. The passive radiation refrigeration technology does not need energy consumption, and the object heat emits heat radiation to the outer space by penetrating the earth atmosphere layer in the infrared heat radiation mode of the atmospheric window wave band (8-13 mu m), thereby achieving the self cooling effect. Research shows that by reasonably improving the spectral characteristics of the surface of an object, even under the condition of direct sunlight in the daytime, the cooling effect lower than the ambient temperature can be realized. Therefore, the technology is probably of good significance in cooling the photovoltaic module, for example, patent publication number CN110660875A, namely, a method for cooling the photovoltaic module by using a transparent middle infrared radiation cellulose film is realized by using the technology. However, the method disclosed by the patent is that a middle infrared radiation cellulose film with a radiation refrigeration effect is embedded between glass and a photovoltaic cell, so that infrared spectrum radiation emitted by the cellulose film is influenced by spectrum selective absorption of the glass, thereby influencing the cooling effect of a photovoltaic module, and in addition, the surface of the glass does not have a hydrophobic self-cleaning function, so that the glass is difficult to remove by simply relying on rainwater after long-time dust accumulation, and further the radiation cooling effect is influenced. Although the patent number CN202111383955.6 discloses a preparation method of a composite coating material with hydrophobic radiation refrigeration and a preparation method thereof, the transmittance of the film prepared by the method for the visible light wave band is not ideal, and if the film is applied to the surface of a photovoltaic module, the absorption of the photovoltaic module for the visible light can be influenced, so that the photoelectric conversion efficiency is reduced. Accordingly, there is still a need in the art for further improvements and enhancements. Disclosure of Invention In view of the shortcomings of the prior art, the invention aims to provide a photovoltaic module with double passive auxiliary cooling and surface hydrophobic functions, which has good cooling effect and good self-cleaning effect on dirt such as dust. To achieve the purpose, the invention adopts the following technical scheme: A photovoltaic module having dual passive auxiliary cooling and surface hydrophobic functions, comprising: a photovoltaic module body; The photovoltaic module comprises a photovoltaic module body, a radiation refrigerating layer with light transmittance, a micro-structure and a light source, wherein the radiation refrigerating layer with light transmittance is arranged on a light-facing surface of the photovoltaic module body; and the moisture absorption hydrogel is arranged on the backlight surface of the photovoltaic module body. The following is a preferred technical scheme of the present invention, but not a limitation of the technical scheme provided by the present invention, and the following preferred technical scheme can better achieve and achieve the objects and advantages of the present invention. As a preferable technical scheme, the photovoltaic module with double passive auxiliary cooling and surface hydrophobic functions, wherein the radiation refrigerating layer with light transmittance has stronger infrared heat radiation capability in a spectrum band of 8-13 μm . As a preferred technical scheme, the photovoltaic module with double passive auxiliary cooling and surface hydrophobic functions, wherein the radiation refrigeration layer with light transmittance comprises a polydimethylsiloxane film. As a preferred technical scheme, the photovoltaic module with double passive auxiliary cooling and