|  | | Cooling Efficiency
|  Relative humidity, the amount of moisture in the air compared to the maximum amount of moisture the air could absorb at the same temperature, is a crucial factor in determining cooling potential. The lower the relative humidity, the more water can be vaporized, and hence, the more heat can be removed. Evaporative cooling can be used in most geographical locations. This is because when temperatures reach their peak during the day, relative humidity is normally at its lowest. The graph above shows potential cooling at different temperatures and levels of humidity. To calculate potential cooling using misting, find the relative humidity for the day, follow that to the curve that is closest to the outdoor temperature, then read the potential temperature drop on the bottom line of chart. (Example: 30% humidity (a), 100° temperature (b) = 26° potential temperature decrease ©.)
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