Ideal spectral emissivity for radiative cooling of earthbound objects

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We investigate the fundamental limit of radiative cooling of objects on the Earth's surfaces under general conditions including nonradiative heat transfer. We deduce the lowest steady-state temperature attainable and highest net radiative cooling power density available as a function of temperature. We present the exact spectral emissivity that can reach such limiting values, and show that the previously used 8-13 mu m atmospheric window is highly inappropriate in low-temperature cases. The critical need for materials with simultaneously optimized optical and thermal properties is also identified. These results provide a reference against which radiative coolers can be benchmarked.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2020-08
Language
English
Article Type
Article
Citation

SCIENTIFIC REPORTS, v.10, no.1

ISSN
2045-2322
DOI
10.1038/s41598-020-70105-y
URI
http://hdl.handle.net/10203/276006
Appears in Collection
MS-Journal Papers(저널논문)
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