被动辐射冷却理想吸收率的系统分析

Passive radiative cooling has had a renaissance in energy consumption, emission reduction, and environmental protection over the past two decades. Ultimate absorptivity determines the cooler’s performance, so the ideal absorptivity is the target for designing passive radiative coolers. In this paper, we systematically analyzed passive radiative cooling, including angle-dependent and wavelength-dependent thermal radiative power Prad, absorption power from the ambient Patm, their power difference Pdiff, absorption power from the sun Psun and thermally conductive and convection power Pcc. During the analytical process, we show the key factors of cooling and analyze the ideal absorptivity of radiators in four conditions. The analytical progress and results will give a reference to the design of the radiator in the future.