I love this video, and similar by NightHawkInLight,[0] but (as they would agree) it's not a commercial product just yet.
For a while I've thought the first thing to coat with a fancy "Free AC" paint should be... the AC! For most sky-cooling rigs the main cost is pipes or panels on the roof to move heat from inside to outside, but AC is already moving heat. AC units operate at a higher temperature, so it should emit more IR radiation as T^4 (meaning a small increase makes a big difference). Most AC has a pretty good sky view, but maybe not as ideal as the roof.
It seems ironic to use "No AC" paint on your AC, but the physics and economics doesn't lie. Per square inch it's probably the most effective place!
For a while I've thought the first thing to coat with a fancy "Free AC" paint should be... the AC! For most sky-cooling rigs the main cost is pipes or panels on the roof to move heat from inside to outside, but AC is already moving heat. AC units operate at a higher temperature, so it should emit more IR radiation as T^4 (meaning a small increase makes a big difference). Most AC has a pretty good sky view, but maybe not as ideal as the roof.
It seems ironic to use "No AC" paint on your AC, but the physics and economics doesn't lie. Per square inch it's probably the most effective place!
[0] https://www.youtube.com/playlist?list=PL1a2HkcVbmAWExiWT__qQ...