Abstract
Passive radiative cooling could reduce energy consumption by reflecting sunlight and radiating heat into outer space at long wave infrared. However, it is challenging that development of environmentally stable radiation-cooled materials that are easy to manufacture and have good weathering resistance. In this work, we developed a scalable radiative-cooling porous film of doped BaSO4 cellulose acetate(BSCA) with good environmental stability. The reflectivity was 0.94 with BSCA film to scatter most of the sun’s rays efficiently and an emissivity of 0.98 to radiate heat rapidly. The maximum temperature different with BSCA film were reduced by 8 ℃ less than the porous cellulose acetate (PCA) film, 13 ℃ than the commercial white paint (CWP) film. Meanwhile, in the switch boxes testing, the surface maximum temperature of the switch box coated with BSCA film were reduced by 9.9 ℃ than the switch box coated with CWP film, which were reduced by 14.7 ℃ than the original switch box. The simulated cooling power of BSCA film was 140.23 W·m−2. The BSCA film shows good optical performance and cooling performance after 3 months of outdoor aging test. The BSCA film is aging-resistant, easy to prepare and convenient for scalable production.
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