A Clear night sky radiative cooling -- How to optimize?

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    Collector Cooling
Salah
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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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thank you for information.
 
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Vídeo: The footage was filmed in real time. The rotor takes advantage of the thermal agitation of the water. The agitation is uniform, so the resultant is zero. When the aluminum cylinders containing frozen water are immersed in the water, about 30% of their surface is in contact with the water, and the rest is thermally insulated by styrofoam. This creates an imbalance in the agitation: the cold side of the water "shrinks," so that the hot side pushes the cylinders toward the cold...
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