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Radiative sky cooling: Fundamental principles, materials, and applications

Journal Article · · Applied Physics Reviews
DOI:https://doi.org/10.1063/1.5087281· OSTI ID:1613653
 [1];  [2];  [2];  [3];  [4];  [2];  [2]
  1. Univ. of Colorado, Boulder, CO (United States); Southeast Univ., Nanjing (China). School of Energy and Environment; DOE/OSTI
  2. Univ. of Colorado, Boulder, CO (United States)
  3. Ruiling Inst. of Advanced Energy and Environmental Solutions, Ningbo (China)
  4. Univ. of Wyoming, Laramie, WY (United States)

Radiative sky cooling cools an object on the earth by emitting thermal infrared radiation to the cold universe through the atmospheric window (8–13 μm). It consumes no electricity and has great potential to be explored for cooling of buildings, vehicles, solar cells, and even thermal power plants. Radiative sky cooling has been explored in the past few decades but limited to nighttime use only. Very recently, owing to the progress in nanophotonics and metamaterials, daytime radiative sky cooling to achieve subambient temperatures under direct sunlight has been experimentally demonstrated. More excitingly, the manufacturing of the daytime radiative sky cooling material by the roll-to-roll process makes large-scale deployment of the technology possible. This work reviews the fundamental principles of radiative sky cooling as well as the recent advances, from both materials and systems point of view. Potential applications in different scenarios are reviewed with special attention to technology viability and benefits. As the energy situation and environmental issues become more and more severe in the 21st century, we conclude radiative sky cooling can be explored for energy saving in buildings and vehicles, mitigating the urban heat island effect, resolving water and environmental issues, achieving more efficient power generation, and even fighting against the global warming problem.

Research Organization:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Grant/Contract Number:
AR0000580
OSTI ID:
1613653
Alternate ID(s):
OSTI ID: 1507229
Journal Information:
Applied Physics Reviews, Journal Name: Applied Physics Reviews Journal Issue: 2 Vol. 6; ISSN 1931-9401
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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