Study on the Influence of Thermal Radiation Wavelength Control on Radiative Cooling

Sky radiation cooling is a passive cooling technology that uses the "atmospheric window" to emit the object's own heat to the low temperature of outer space; this technology has useful properties such as low energy consumption and no pollution, so it has attracted widespread attention in recent years. Radiant cooling technology essentially controls the ingress and egress of thermal radiation. Since there are differences in the energy contained in thermal radiation of different wavelengths, controlling the wavelength of thermal radiation entering and exiting the cooling device has a significant impact on the cooling effect. In this paper, comsol simulation software is used to establish a wavelength selection model of radiative heat transfer, aiming to study the impact of different wavelength ranges on sky radiation coolers.