Clear night sky radiative cooling -- How to optimize?

  • #1
Salah
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TL;DR Summary
radiative cooling.
hi guys:
what should be the colour of the collector for best cooling effect of night clear sky radiative cooling?
 
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  • #2
Black, including in the infrared.
 
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Likes Bystander
  • #3
thank you for information.
 
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