A radiative vapor condenser sheds heat in the form of infrared radiation and cools itself to below the ambient air temperature to produce liquid water from vapor. This effect has been known for centuries, and is exploited by some insects to survive in dry deserts. Humans have also been using radiative condensation for dew collection. However, all existing radiative vapor condensers must operate during the nighttime. Here, we develop daytime radiative condensers that continue to operate 24 h a day. These daytime radiative condensers can produce water from vapor under direct sunlight, without active consumption of energy. Combined with traditional passive cooling via convection and conduction, radiative cooling can substantially increase the performance of passive vapor condensation, which can be used for passive water extraction and purification technologies.
|Original language||English (US)|
|Journal||Proceedings of the National Academy of Sciences|
|State||Published - Mar 31 2021|
Bibliographical noteKAUST Repository Item: Exported on 2021-04-05
Acknowledgements: We acknowledge support from the NSF (Award CMMI-156197 to Z.Y. and M.Z.; Award CBET-1932843 to Q.G. and Z.Y.; Award CBET-1932968 to Q.G.; and Grant ECCS-1750341 to M.A.K.). M.Z. acknowledges support from the 3M Fellowship.
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