Air Conditioning isn't free... but we're close. on HackerTube: recommended by 1 Hacker News commenter across 1 month, 2023–2025.
tutorial · evergreen
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.
HN points to it in threads on radiative cooling as a hands-on explanation of passive daytime cooling.
“there are a couple good videos about it from NightHawkInLight”
4 Hacker News comments link this video. Each one links back to its thread.
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 ▶ this video [link]
in “NASA's Voyager Found a 30k-50k Kelvin "Wall" at the Edge of Solar System” · View on HN
That problem can be solved by adding a mirrored ring around the cooling surface, so it can only "see" the sky: ▶ this video
in “Passive radiative cooling ceramic with high solar reflectivity” · View on HN
There is a detailed example of this uploaded a few months ago here ▶ this video [In fact, I just noticed the author of the OP video posted on this one]
in “Making Radiative Sky Cooling Paint (With Novel CaCO₃ Microsphere Synthesis) [video]” · View on HN
>Only active cooling can cool anything below the ambient temperature. Not exactly: [link] Couple of videos explaining the effect [link] ▶ this video
in “Just How White Can White Paint Get?” · View on HN