All bodies do radiate away heat. During day light time solar radiation
more than compensates the heat loss.
But a highly reflective layer almost (96-97%)stops this compensation.
IR radiation is just a function of surface temperature and the air
interface.
Just a small riddle: What happens if you use this paste as sun-cream and
go for a daylight tropical desert walk?
J.W.
On 05.05.2021 16:31, H LV wrote:
This video talks about a new ultra white paint which the inventors
claim could dramatically reduce air conditioning costs.
https://www.youtube.com/watch?v=Ay6ckBojc_0
<https://www.youtube.com/watch?v=Ay6ckBojc_0>
see also press release:
https://www.purdue.edu/newsroom/releases/2021/Q2/the-whitest-paint-is-here-and-its-the-coolest.-literally..html
<https://www.purdue.edu/newsroom/releases/2021/Q2/the-whitest-paint-is-here-and-its-the-coolest.-literally..html>
However, the explanation doesn't make sense to me. If the new paint is
so good at reflecting sunlight in the visible as well as the infrared
and ultraviolet regions how can it facilitate indoor cooling? They are
claiming that it can transmit infrared radiation but isn't a good
reflector of radiation also a bad transmitter of radiation?
Harry
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Jürg Wyttenbach
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