how does a desert cooler cool on a hot dry days
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The cooling in a desert cooler iscaused by the evaporation of water. Adesert cooler cools better on a hot anddry day because the higher temperature on a hot day increases the rate of evaporation of water and the dryness of air (low humidity of air) also increases the rate of evaporation of water.
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The particles of liquid in desert cooler absorb energy from the surrounding to regain the energy lost during evaporation. In summer this is fast. Hence desert cooler cool better in a hot dry day.
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