why the air passing through a desert cooler become cooler
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Desert coolers are based on the simple principle that when unsaturated air comes in contact with water, the water evaporates. In the process, the moisture content of air increases, while its temperature decreases. The resulting cold but moist air is used for providing cooling
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The water when evaporated from a desert cooler absorbs energy from the surrounding and makes the surrounding cool. Evaporation is inversely proportional to humidity. Lesser the humidity and higher the temperature, the faster is the evaporation. So on a hot dry day, the evaporation is more so the surrounding is more cooled. So, a desert cooler cools better on a hot dry day.
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