Full Daytime Sub-ambient Radiative Cooling in Commercial-like Paints with High Figure of Merit
By Xiangyu Li, J. Peoples, Zhifeng Huang, Zixuan Zhao, J. Qiu, X. Ruan. Cell Reports Physical Science, 2020
328 citations recorded by the source corpus.
Radiative cooling is a passive cooling technology by reflecting sunlight and emitting radiation in the atmospheric sky window. Although highly desired, full daytime sub-ambient radiative cooling in commercial-like single-layer particle-matrix paints is yet to be achieved. In this work, we have demonstrated full daytime sub-ambient radiative cooling in CaCO3-acrylic paint by adopting large bandgap fillers, a high particle concentration and a broad size distribution. Our paint shows the highest solar reflectance of 95.5% among paints and a high sky-window emissivity of 0.94. Field tests show cooling power exceeding 37 W/m2 and lower surface temperature more than 1.7C below ambient at noon. A figure of merit RC is proposed to compare the cooling performance under different weather conditions. The RC of our cooling paint is 0.62, among the best radiative cooling performance while offering unprecedented benefits of the convenient paint form, low cost, and the compatibility with commercial paint fabrication process.
Subfields: Civil and Structural Engineering, Computational Mechanics, Environmental Engineering
View Paper: https://www.semanticscholar.org/paper/093792571064f7f2a719fdf51231a80847dd36a1
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In Environmental Engineering
Citations in the corpus
- Temperature-adaptive radiative coating for all-season household thermal regulation (2021, background): “It is now advanced by the development of daytime radiative cooling (7–13) using materials with low solar absorptance and high thermal emittance in the form of thin films (8), organic paints (10, 14), or structural materials (11).”