Optical properties and cooling performance analyses of single-layer radiative cooling coating with mixture of TiO_(2) particles and SiO_(2) particles  

作　　者：CHENG ZiMing SHUAI Yong GONG DaYang WANG FuQiang LIANG HuaXu LI GuiQiang 

机构地区：[1]School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China [2]School of New Energy,Harbin Institute of Technology at Weihai,Weihai 264209,China [3]Key Laboratory of Aerospace Thermophysics,Ministry of Industry and Information Technology,Harbin 150001,China [4]School of Engineering,University of Hull,Hull HU67RX,UK

出　　处：《Science China(Technological Sciences)》2021年第5期1017-1029,共13页中国科学（技术科学英文版）

基　　金：supported by the China National Key Research and Development Plan Project (Grant No.2018YFA0702300);the National Natural Science Foundation of China (Grant No.51676061);the Taishan Scholars of Shandong Proviance (Grant No.tsqn201812105)。

摘　　要：Radiative cooling can achieve cooling effect without consuming any energy by delivering energy into outer space(3K) through"atmospheric window"(8–13 μm). Conventional radiative cooling coating with multi-layer structure was severely restricted during application due to its complex preparation process and high cost. In this study, a single-layer radiative cooling coating with mixture of TiO_(2) particles and SiO_(2) particles was proposed. The algorithm for calculating the radiative properties of the multi-particle system was developed. Monte Carlo ray-tracing method combined with that algorithm was used to solve the radiative transfer equation(RTE) of the single-layer radiative cooling coating with mixture of TiO_(2) particles and SiO_(2) particles.The effects of particle diameter, volume fraction and coating thickness on radiative cooling performance were analyzed to obtain the best radiative cooling performance. The numerical results indicated that the average reflectivity of the single-layer radiative cooling coating with mixture of TiO_(2) particles and SiO_(2) particles in the solar spectrum can reach 95.6%, while and the average emissivity in the "atmospheric window" spectrum can reach 94.9% without additional silver-reflectance layer. The average reflectivity in the solar spectrum and average emissivity in the "atmospheric window" spectrum of the single-layer radiative cooling coating with mixture of TiO_(2) particles and SiO_(2) particles can increase 4.6% and 4.8% compared to the double-layer radiative cooling coating. This numerical research results can provide a theoretical guidance for design and optimization of single-layer radiative cooling coatings containing mixed nanoparticles.

关 键 词：radiative cooling optical property multi-particles cooling performance radiative transfer atmospheric window 

分 类 号：TB332[一般工业技术—材料科学与工程]