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Evaporative cooling is the process of actually reducing
air temperature by the evaporation of water in the air stream.
The best performing systems draw incoming air through
a wetted pad at the inlet of the ventilation system.
As air passes across the great amount of surface area within
the pad, BTUs of heat are removed from the air, lowering
the air temperature. The more water is evaporated,
the greater the temperature reduction. Also, the drier
the air at low relative humidity, the greater the ability
of evaporation to take place. During the hottest
time of the day, when cooling is needed, generally the humidity
will be low, and the air can be cooled several degrees.
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