3 ms·

They are usually reflective out of band, for unifacial (ito on semiconductor on a metallic backing), so ~40% of the radiation is heading back to space, vs 10-20

They are usually reflective out of band, for unifacial (ito on semiconductor on a metallic backing), so ~40% of the radiation is heading back to space, vs 10-20% for a typical roof. However... that means they don't radiate well at night (they have low emissivity and are not well thermally coupled to the roof). Painting the roof white is ideal.

pfdietz 3y ago
Hmm. I wonder if the glass can have a coating that would make them more emissive in the atmospheric transparent bands of the mid- and far-IR.
jstanley 3y ago
It is easy to tell that they are black in the visible spectrum because they look black.