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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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