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‘We should have better answers by now’: climate scientists baffled by unexpected pace of heating
(www.theguardian.com)
this post was submitted on 15 Aug 2024
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Aluminum is far more thermally conductive and makes both a far better radiator and absorber of heat. Ultimately it's a coating that does the absorbing though, as shiny metal reflects IR regardless of the material. Source: I work with this stuff
Light coloured or reflective roofs do make sense though and that's why traditional homes in most hot climates are painted white.
Yes. Ideally you want a sandwich aluminum -steel - aluminum. But that's not ideal. Sometimes you see this in heat shields around exhaust systems. But nothing beats experience. The fact is that if you put a sheet of tar roofing, a sheet of steel and a sheet of aluminum under the sun, the tar will get melty, the steel will get fucking hot and the aluminum will be nice and cool to the touch. Sure you can spray aluminum onto the steel or the tar but it won't be as efficient and you won't get the reflective properties that aluminum has. Remember the wavelength of heat is past the 0.1um and it's up to 100um, so most coatings are not that thick and most roughnesses are not that rough locally where it matters. Machined aluminum for example will have a local roughnesses less than 25um, sometimes under 1um.