alt Hacker NewsI have had high hopes for passive daytime radiative cooling since I read about it 10 years ago. Converting waste heat to an infrared wavelength that flies off into space day or night is apparently not that easy or cost effective right now.
https://www.asme.org/topics-resources/content/new-solar-ener...
This is unlikely to work in a data center with thousands or tens of thousands of servers emitting heat. Possibly this sort of system will some day function for buildings where only humans are emitting heat.