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The wet bulb temperature of the air is the lowest
temperature to which water can be cooled by evaporation. As the outside air
approaches the water saturation point, it loses its capacity to accept more
vapor, thereby reducing the evaporation and consequently, the cooling
process.
Therefore, a tower's performance can be measured by how
close it can bring the cold water temperature to the wet bulb temperature of the
surrounding air. Note that the cold water (or sump) temperature can never be
lower than the wet bulb temperature.
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