In extremely dry climates, evaporative cooling of air has the added benefit of conditioning the air with more moisture for the comfort of building occupants. This can cool air using much less energy than refrigeration. The temperature of dry air can be dropped significantly through the phase transition of liquid water to water vapor (evaporation). Evaporative cooling exploits the fact that water will absorb a relatively large amount of heat in order to evaporate (that is, it has a large enthalpy of vaporization). Evaporative cooling differs from other air conditioning systems, which use vapor-compression or absorption refrigeration cycles. Porous pottery and coarse cloth maximize the area for evaporation.Īn evaporative cooler (also known as evaporative air conditioner, swamp cooler, swamp box, desert cooler and wet air cooler) is a device that cools air through the evaporation of water. An Egyptian qullah, set in drafts to cool interiors.
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