Heating, Cooling & Refrigeration · Recorded milestone
Daytime radiative cooling below ambient
Recorded year2014
A published outdoor experiment demonstrates passive below-ambient cooling under direct sunlight using a photonic surface.
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Sources & evidence
- Passive radiative cooling below ambient air temperature under direct sunlight 2014
A 2014 photonic radiator demonstrated below-ambient daytime cooling under specific outdoor conditions.
Raman and colleagues
Record reviewed 2026-10-18