Figure 2.
a) Schematics of a radiative cooler with some of the radiative and nonradiative processes. b) The cooling power and T a−T r of a broadband and selective radiators. The solid curves represent the cooling with the exclusion of any solar and nonradiative contributions. The dashed curves include 3% solar power absorption and a practical nonradiative heat gain coefficient of 2 W m−2 °C−1. The intersections of the black dashed curve with the cooling power curves represent the values of T a−T r. Inset shows the spectral emissivity of an ideal selective and broadband radiators.