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About this video
Tech Ingredients shows how to build a liquid panel with a specialty paint that, placed outside, cools below ambient air temperature. It demonstrates radiative sky cooling.
Why it appears in the archive
HN points to it in threads on radiative cooling as a hands-on explanation of passive daytime cooling.
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From the Hacker News discussion
It's a thing in from thousands of years ago [LINK] and today [LINK] for PDRC there are a couple good videos about it from NightHawkInLight [LINK] , [LINK] and Tech Ingredients [VIDEO] [LINK]
Read original comment ↗>Only active cooling can cool anything below the ambient temperature. Not exactly: [LINK] Couple of videos explaining the effect [LINK] [VIDEO]
Read original comment ↗There is a detailed example of this uploaded a few months ago here [VIDEO] [In fact, I just noticed the author of the OP video posted on this one]
Read original comment ↗That problem can be solved by adding a mirrored ring around the cooling surface, so it can only "see" the sky: [VIDEO]
Read original comment ↗