Cool heads clear a pathway for the development of a sustainable cooling technology. In a world experiencing increased heat stress, a zero-carbon-emission cooling technology that consumes no electricity, operating instead by shedding heat directly into outer space, would be a groundbreaking advanc
Radiative-cooling devices offer electricity-free cooling by radiating heat that is not absorbed by the atmosphere, instead escaping the Earth’s atmosphere to outer space. Credit: © 2023 KAUST; Xavier PitaIn a world experiencing increased heat stress, a zero-carbon-emission cooling technology that consumes no electricity, operating instead by shedding heat directly into outer space, would be a groundbreaking advance.
Many materials display radiative cooling at night. “The key challenge is to achieve cooling to below ambient temperatures while under direct sunlight,” Gan says. “One must simultaneously minimize the heating effect of solar absorption while maximizing thermal emission in the atmospheric window.” “Due to uncontrollable weather conditions and variations in measurement settings, it becomes challenging to compare and comprehend the actual cooling performance of different technologies, and so to identify the best strategies among the various radiative cooling designs being studied,” Gan says., we were invited to write an article proposing standardized criteria and characterization procedures for evaluating radiative cooling performance,” Gan adds.
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