Air Pollution Control Equipment Selection Guide, 3rd Edition

6

Evaporative Coolers

Wayne T. Hartshorn

Hart Environmental, Inc., Lehighton, Pennsylvania

6.1 Device Type

Evaporative gas coolers use the controlled application of a liquid (usually water) to a hot gas stream to reduce that gas stream's temperature through the evaporation of that liquid. The liquid is often applied in the form of an air-atomized mist or fog.

6.2 Typical Applications and Uses

Evaporative coolers are designed to reduce a hot gas stream's temperature to a level suitable for further treatment. They are also used to “condition” the particulate before capture in another device.

When a gas stream requires treatment by a device that is sensitive to gas temperatures as well as gas humidity (such as a fabric filter collector), ...