Radiative cooling
Videos
In the study of heat transfer, radiative cooling 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.
Ice Pool beside the Meybod yakhchāl in Iran
Passive cooling
Videos
Passive cooling is a building design approach that focuses on heat gain control and heat dissipation in a building in order to improve the indoor thermal comfort with low or no energy consumption. This approach works either by preventing heat from entering the interior or by removing heat from the building.
A courtyard in Florence, Italy. It is tall and narrow, with a fountain spouting very thin streams of water at the bottom, and upper rooms opening onto it. Night flushing of the courtyard happens automatically as the night air cools; evaporative cooling cools it further and can be used to create drafts and change the air during the day. Windows can be left open around the clock.
A salasabil (currently dry) in the Red Fort in Delhi, India. A salasabil is designed to maximize evaporative cooling; the cooling, in turn, may be used to drive air circulation.