Passive directional sub-ambient daytime radiative cooling

Bhatia, Bikram; Leroy, Arny; Shen, Yichen; Zhao, Lin; Gianello, Melissa; Li, Duanhui; Gu, Tian; Hu, Juejun; Soljačić, Marin; Wang, Evelyn N.

doi:10.1038/s41467-018-07293-9

Title: Passive directional sub-ambient daytime radiative cooling

Journal Article · 27 November 2018 · Nature Communications

DOI: https://doi.org/10.1038/s41467-018-07293-9 · OSTI ID:1566605

^[1]; Leroy, Arny ^[1]; Shen, Yichen ^[1]; Zhao, Lin ^[1]; Gianello, Melissa ^[1]; Li, Duanhui ^[1]; Gu, Tian ^[1]; Hu, Juejun ^[1]; Soljačić, Marin ^[1]; Wang, Evelyn N. ^[1]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Demonstrations of passive daytime radiative cooling have primarily relied on complex and costly spectrally selective nanophotonic structures with high emissivity in the transparent atmospheric spectral window and high reflectivity in the solar spectrum. Here, we show a directional approach to passive radiative cooling that exploits the angular confinement of solar irradiation in the sky to achieve sub-ambient cooling during the day regardless of the emitter properties in the solar spectrum. We experimentally demonstrate this approach using a setup comprising a polished aluminum disk that reflects direct solar irradiation and a white infrared-transparent polyethylene convection cover that minimizes diffuse solar irradiation. Measurements performed around solar noon show a minimum temperature of 6 °C below ambient temperature and maximum cooling power of 45 W m^–2. Our passive cooling approach, realized using commonly available low-cost materials, could improve the performance of existing cooling systems and enable next-generation thermal management and refrigeration solutions.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0001299

OSTI ID:: 1566605

Journal Information:: Nature Communications, Vol. 9, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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High-performance subambient radiative cooling enabled by optically selective and thermally insulating polyethylene aerogel Leroy, A.; Bhatia, B.; Kelsall, C. C. Science Advances, Vol. 5, Issue 10 https://doi.org/10.1126/sciadv.aat9480	journal	October 2019
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High-performance subambient radiative cooling enabled by optically selective and thermally insulating polyethylene aerogel Leroy, A.; Bhatia, B.; Kelsall, C. C. Science Advances, Vol. 5, Issue 10 https://doi.org/10.1126/sciadv.aat9480	journal	October 2019
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Title: Passive directional sub-ambient daytime radiative cooling

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