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Title: Passive directional sub-ambient daytime radiative cooling

Abstract

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.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Research Org.:
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 Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1566605
Grant/Contract Number:  
SC0001299
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; solar (photovoltaic); solar (thermal); solid state lighting; phonons; thermal conductivity; thermoelectric; defects; mechanical behavior; charge transport; spin dynamics; materials and chemistry by design; optics; synthesis (novel materials); synthesis (self-assembly); synthesis (scalable processing)

Citation Formats

Bhatia, Bikram, Leroy, Arny, Shen, Yichen, Zhao, Lin, Gianello, Melissa, Li, Duanhui, Gu, Tian, Hu, Juejun, Soljačić, Marin, and Wang, Evelyn N. Passive directional sub-ambient daytime radiative cooling. United States: N. p., 2018. Web. doi:10.1038/s41467-018-07293-9.
Bhatia, Bikram, Leroy, Arny, Shen, Yichen, Zhao, Lin, Gianello, Melissa, Li, Duanhui, Gu, Tian, Hu, Juejun, Soljačić, Marin, & Wang, Evelyn N. Passive directional sub-ambient daytime radiative cooling. United States. doi:10.1038/s41467-018-07293-9.
Bhatia, Bikram, Leroy, Arny, Shen, Yichen, Zhao, Lin, Gianello, Melissa, Li, Duanhui, Gu, Tian, Hu, Juejun, Soljačić, Marin, and Wang, Evelyn N. Tue . "Passive directional sub-ambient daytime radiative cooling". United States. doi:10.1038/s41467-018-07293-9. https://www.osti.gov/servlets/purl/1566605.
@article{osti_1566605,
title = {Passive directional sub-ambient daytime radiative cooling},
author = {Bhatia, Bikram and Leroy, Arny and Shen, Yichen and Zhao, Lin and Gianello, Melissa and Li, Duanhui and Gu, Tian and Hu, Juejun and Soljačić, Marin and Wang, Evelyn N.},
abstractNote = {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.},
doi = {10.1038/s41467-018-07293-9},
journal = {Nature Communications},
number = 1,
volume = 9,
place = {United States},
year = {2018},
month = {11}
}

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Cited by: 8 works
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