Energy Free Cooling through Physics

[Piotrsko]

Closed cell foam would be a lot less thick perhaps 12"

I have a silver metal roof, not quite as hot in the attic during summer but still above 130 during day.

[freebeard]

DIY Radiative Sky Cooling Fibers Successfully Made!

The goal is fibers than can be felted or spun into yarn; with a few false starts. The base materials are PLA and Barium Sulphate.

[freebeard]

For thermal management you need a thermal battery.

DIY Supermaterial Could Save You From Heatstroke: Salt based PCMs

As a backing for solar panels seems especially useful.

[freebeard]

The adventure continues. There is a live stream from Nighthawkinlight on a further development of the cooling paint.

New sky cooling paint recipe (Patreon livestream no 4)

It's unwatchable in parts (audio,etc.) but starting at t = 42:23 you get the pertinent info. It's over after 1:10.

Anyways, the improvement is using PLA plastic with ethyl acetate, water and alcohol; with no added pigments. Maybe not as effective as the previous recipe, but from more benign materials and it's sprayable.

I checked proto-pasta.com/ and they have a clear PLA as well as matte white.

It's not abrasion resistant, so not ready for prime time.