1.4M views · Feb 8, 2023 · 25:45 · 1 HN recommender · 4 mentions · discussed 2023–2025
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 Hacker News points people here: 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”HN comment, 2025
“there are a couple good videos about it”
Good video on passive daytime radiative cooling
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
“Couple of videos explaining the effect”
Explains cooling below ambient temperature
>Only active cooling can cool anything below the ambient temperature. Not exactly: link Couple of videos explaining the effect link this video
“There is a detailed example of this uploaded a few months ago here”
Detailed example of radiative cooling paint
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]
“That problem can be solved by adding a mirrored ring around the cooling surface”
Mirrored ring so surface sees only the sky
That problem can be solved by adding a mirrored ring around the cooling surface, so it can only "see" the sky: this video
