EVAPORATIVE cooling is energy-efficient, environmentally benign, and cost-effective in many applications and all climates.
Applications range from comfort cooling in residential, agricultural,
commercial, and institutional buildings, to industrial
applications for spot cooling in mills, foundries, power plants, and
other hot environments. Several types of apparatus cool by evaporating
water directly in the airstream, including (I) direct evaporative
coolers, (2) spray-filled and wetted-surface air washers, (3)
sprayed-coil units, and (4) humidifiers. Indirect evaporative cooling
equipment combines the evaporative cooling effect in a secondary
airstream with a heat exchanger to produce cooling without adding
moisture to the primary airstream.