German Science Guy on Radiative Cooling

See Radiative cooling: A review of fundamentals, materials, applications, and prospects by Bin Zhao, Mingke Hu, Xianze Ao, Nuo Chen and Gang Pei. Also the numerous other links in the video description.

See this interesting comment: ... oh, too bad, it's gone. It was basically about the Thermolectric effect being a way to do this without any moving parts. See also this page from a company that makes them.

Here's his video on Thermophotovoltaic cells: 

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