Nowadays Iranians have changed the windcatcher into an evaporative cooler (Coolere Âbi) and use it widely. An earlier form of air cooling, the windcatcher (Bâd gir), was invented in Persia (Iran) thousands of years ago in the form of wind shafts on the roof, which caught the wind and passed it through water and blew the cooled air into the building. 4 Comparison to phase-change air conditioningĬivilizations throughout the ages have found ingenious ways to combat the heat in their region.In highly humid climates, evaporative cooling may have little thermal comfort benefit beyond the increased ventilation and air movement it provides. For example, industrial plants, commercial kitchens, laundries, dry cleaners, greenhouses, spot cooling (loading docks, warehouses, factories, construction sites, athletic events, workshops, garages, and kennels) and confinement farming (poultry ranches, hog, and dairy) all often employ evaporative cooling. In moderate humidity locations there are many cost-effective uses for evaporative cooling, in addition to their widespread use in dry climates. Some evaporative coolers may also serve as humidifiers in the heating season. But evaporative cooling and vapor-compression air conditioning are sometimes used in combination to yield optimal performance. In dry climates, the installation and operating cost of an evaporative cooler can be much lower than refrigerative air conditioning, often by 80% or so. For example, in the United States, the western/mountain states are good locations, with swamp coolers very prevalent in cities like Denver, Salt Lake City, Albuquerque, El Paso and Phoenix, where sufficient water is available in Australia, evaporative air conditioning is popular in Perth. Air washers and wet cooling towers utilize the same principles as evaporative coolers, but are optimized for purposes other than air cooling.Įvaporative cooling is especially well suited for climates where the air is hot and humidity is low. In the United States, small-scale evaporative coolers are called swamp coolers by some users due to the humid air conditions produced. They differ from refrigeration or absorption air conditioning, which use the vapor-compression or absorption refrigeration cycles. Evaporative coolers (also called air, swamp, or desert coolers) devices which use simple evaporation of water in air.
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