| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| Preparation and Experimental Study of Radiation Cooling Film with SiO2/SiC |
| LI Pei1, QIN Liang2, HE Hong1,*, ZHANG Yajun1,*
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1 College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
2 Gansu Yinguang Chemical Industry Group Co., Ltd, Baiyin 730900,China |
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Abstract With the increasing global demand for refrigeration energy, energy and environmental problems are becoming more and more serious. Radia-tion cooling is a new technology which is energy-saving and environment-friendly, and its application research is of great significance. In this paper, the preparation and performance test of radiation cooling film with SiO2/SiC added to cool down day and night were carried out. The effects of the volume fraction of silicon dioxide and silicon carbide and the thickness of the film on the emissivity of the composite film were studied by orthogonal experiment. The significant rule of the influence of the above factors on the emissivity of the film was obtained: the film thickness> SiC volume fraction> SiO2 volume fraction. When the filling volume fraction of SiO2 and SiC is 8% and 1%, respectively, and the thickness of composite film is greater than 60 μm, the emissivity of composite film is higher than 0.9. In order to achieve better cooling effect in the daytime, a new technology of electron beam evaporation was used to prepare the reflective layer on the surface of composite film. The different thickness of Ag reflector was analyzed. When the thickness is 200—600 nm, the reflection efficiency of the reflector is more than 90%. The day and night temperature drop test of the composite membrane was carried out by using the self-made experimental device. According to the change of the surface temperature of pure PET film, the temperature of the radiation cooling film can reach 10 ℃ at night and 5 ℃ at noon.
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Published: 03 August 2021
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About author:: Pei Li graduated from Beijing University of Chemical Technology in June 2020 with a master's degree in engineering. Mainly engaged in mechanical design and research of radiation cooling technology.
Hong He, associate professor, College of Mechanical and Electrical Engineering, Beijing University of Che-mical Technology. She is mainly engaged in the research on the rheological theory and equipment for polymer processing, constitutive relationship and simulation of nano reinforced polymer composites.
Yajun Zhang, professor, College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology. He is mainly engaged in the research of mechanical control and polymer micro nano manufac-turing. |
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2021, Vol. 35 
