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Cake day: June 17th, 2023

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  • I think the “radiative cooling” (article link) and “atmospheric window” (publication link) refers to the gap in the atmosphere’s radiation spectrum. It’s an infrared frequency neither emitted by the air/deep space nor is it absorbed by the atmosphere, so the energy is literally beamed into space - passively. Nighthawkinlight (or hawkinlight?) did a video on it and managed to get some test panels to work, cooling to below ambient air temp both in shade and in direct sunlight. All they need is a clear view of the sky. Durability is still an issue as noted by the abstract and his video. I don’t know what molecule emits on the frequency, but the panels were white. Pretty exciting. I hope we get something useful soon. Makes it look doubly silly to have dark gray shingles on houses here.