Desert air cooler working process

What is an Evaporative Cooler?

An evaporative cooler (also swamp cooler, desert cooler, and wet air cooler) is a device that cools air through the evaporation of water.

Evaporative cooling differs from typical air conditioning systems which use vapor-compression or absorption refrigeration cycles. Evaporative cooling works by employing water's large enthalpy of vaporization. The temperature of dry air can be dropped significantly through the phase transition of liquid water to water vapor, which requires much less energy than refrigeration. In extremely dry climates, it also has the added benefit of conditioning the air with more moisture for the comfort of occupants. Unlike refrigeration, it requires a water source, and must continually consume water to operate.

In the United States, the use of the term swamp cooler may be due to the odor of algae produced by early units.Air washers and wet cooling towers use the same principles as evaporative coolers but are optimized for purposes other than cooling the air inside a building. For example, an evaporative cooler may be designed to cool coils of a large air conditioning system to increase its efficiency.

Mini air cooler

Evaporative cooling is especially well suited for climates where the air is hot and humidity is low. In the United States, the western/mountain states are good locations, with evaporative coolers prevalent in cities like Denver, Salt Lake City, Albuquerque, El Paso, Tucson, and Fresno where sufficient water is available. Evaporative air conditioning is also popular and well-suited to the southern (temperate) part of Australia. In dry, arid climates, the installation and operating cost of an evaporative cooler can be much lower than that of refrigerative air conditioning, often by 80% or so. However, evaporative cooling and vapor-compression air conditioning are sometimes used in combination to yield optimal cooling results. Some evaporative coolers may also serve as humidifiers in the heating season.

In locations with moderate humidity there are many cost-effective uses for evaporative cooling,

in addition to their widespread use in dry climates. 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) often employ evaporative cooling. In highly humid climates, evaporative cooling may have little thermal comfort benefit beyond the increased ventilation and air movement it provides.

Source von Wikipedia


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Air Flow from Evaporative Cooler

Evaporative Cooler Air Flow

An evaporative cooler is basically a large fan with water-moistened pads in front of it.

The fan sucks the warm air from outside through the moistened pads and blows the resulting cooled air through your office or home.Water is supplies to the pads through small “supply” lines. This water then soaks the pads and drizzles through them to collect at the bottom of the cooler. A small water pump then circulates the water back to the top and the process continues
As water is being continually lost through evaporation, it is essential that you have a good float valve (similar to the one used in toilets) that adds water to the evaporative cooler when levels start to get low.
A large fan then extracts air through the pads and evaporation cools the temperature of the air, which is then blown through your home cooling it.

TIP – To get you evaporative cooler to work effectively, the cooled air must be allowed to leave you home. So by strategically choosing which windows you leave open, you can direct the flow of cool air through your home or other building.

Source From: www.cosmeticsmachinery.blogspot.com