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E – 1820 Evaporative Cooling Design Guidelines Manual


Evaporative cooling is a method of converting hot air into a cool breeze using the process of evaporating water. There are two essential requirements for evaporative cooling: 1) a wetted surface (supplied by filter pads) and 2) A source of moving air (supplied by a blower powered by an electric motor). The technology is a versatile and energy-efficient alternative to compressor-based cooling. Compared to air-conditioning which uses mechanical refrigeration, the evaporative cooling can fully satisfy building cooling loads using one-fourth the energy of conventional equipment.

The performance of evaporative systems deteriorates as the humidity increases. Consequently, evaporative systems are not suitable for the humid coastal regions. They are generally suitable for areas with dry summers (most of the western United States and other dry-climate areas worldwide. Evaporative cooling is also appropriate for spaces with high outside air ventilation requirements such as patios, auto garages, workshops, locker rooms, restaurant, kitchens, barns, green houses, kennels, agricultural areas, warehouses, docks or bays.

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