15-11-2017, 04:20 PM
An evaporation cooler (also swamp cooler, desert cooler and humid air cooler) is a device that cools the air through the evaporation of water. Evaporative cooling differs from typical air conditioning systems, which use steam cooling or vapor compression cycles. Evaporative cooling works by exploiting the great enthalpy of water vaporization. The temperature of the dry air can be significantly reduced through the phase transition from liquid water to water vapor (evaporation). This can cool the air using much less energy than cooling. In extremely dry climates, evaporative cooling of the air has the additional benefit of conditioning the air with more moisture for the comfort of the building's occupants.
The cooling potential for evaporative cooling depends on the depression of the wet bulb, the difference between the temperature of the dry bulb and the temperature of the wet bulb. In arid climates, evaporative cooling can reduce energy consumption and total conditioning equipment as an alternative to compressor-based cooling. In climates not considered arid, indirect evaporative cooling can still take advantage of the evaporative cooling process without increasing humidity. Passive evaporative cooling strategies offer the same benefits of mechanical evaporative cooling systems without the complexity of equipment and conduits.