Radiative cooling
Loss of heat by thermal radiation / From Wikipedia, the free encyclopedia
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In the study of heat transfer, radiative cooling[1][2] is the process by which a body loses heat by thermal radiation. As Planck's law describes, every physical body spontaneously and continuously emits electromagnetic radiation.
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Radiative cooling has been applied in various contexts throughout human history, including ice making in India and Iran,[3] heat shields for spacecraft,[4] and in architecture.[5] In 2014, a scientific breakthrough in the use of photonic metamaterials made daytime radiative cooling possible.[6][7] It has since been proposed as a strategy to mitigate local and global warming caused by greenhouse gas emissions known as passive daytime radiative cooling.[8]