Transparent, anti-corrosion and high broadband emission coating for zero energy consumption cooling technology

Abstract

Daytime radiative cooling as passive cooling technology with zero consumption of energy and zero emission of green gas, has recently attracted tremendous interest by reflecting sunlight and radiating heat to the ultracold outer space. Some progress has been made, while it still remains big challenge in transparent and radiation cooling double characteristics radiative coolers. Here, we propose a spectrally selective coating based on tricyclodecane dimethanol diacrylate (DCPDA) monomer. Acid- and basic-proof coating are fabricated with simple and scalable blade and spray coating methods at room temperature. The coated glass displays a transmissivity around 90% in visible wavelengths from 400 nm to 800 nm and a thermal emissivity above 95% over atmospheric window (8–13 μm). In clear summer in Yichang city with no wind, outdoor cooling tests demonstrated that realizes sub-ambient cooling of 18.6 °C during midday when applied on the aluminum (Al) sheets substrate. Featured with scalability, durability, and superior cooling performance make the film shows promising potentials for transparent radiative cooling applications.