An analytical study of enhancing performances for daytime silicon micro-pillar radiative cooler

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Abstract In recent years, radiative cooling, as an energy-free and renewable cooling technology, has undergone extensive and in-depth research and development. However, current research on radiative coolers with high-performance metamaterials structures remains relatively limited. In this paper, through simulation and analysis, we conducted a comparative study on the performance of radiative coolers with planar multilayer film structure and radiative coolers with metamaterials structure. In the research, we first investigated the performance of radiative coolers with planar multilayer film structure. Subsequently, on the basis of the Si 3 N 4 /SiO 2 /Si 3 N 4 /Ag planar multilayer film structure, we constructed periodic cylindrical array structure, which effectively enhances the performance of the radiative cooler. Finally, we further replaced the periodic cylindrical array structure with periodic square prism array structure to explore the impact of structural morphology changes on performance, and ultimately completed the design of high-performance daytime radiative cooler. Through structural optimization, the radiative cooler model studied in this paper exhibits high reflectivity in the solar spectrum band and high emissivity in the atmospheric window band. The results showed that the optimized device can achieve excellent radiative cooling performance under conventional solar radiation conditions, providing an effective technical approach for the practical application of daytime radiative cooling.

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