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 Evaporative Air Cooler


Evaporative coolers, as their name suggests, use evaporation—the conversion of water into water vapor—to lower ambient temperatures and achieve effective cooling. Their primary advantages are their low energy consumption, more effective cooling when compared with traditional fans, and reasonable cost. Their disadvantages are their dependency on ambient humidity and the fact that they don’t cool as effectively as air conditioners.

  • Describe how evaporative coolers work
  • Explain how evaporative coolers differ from both fans and air conditioners
  • Show how to best use evaporative coolers
  • Help you choose the right type of cooler for your space
How Evaporative Coolers Work

Evaporative air coolers, as the name suggests, use the chemical process of evaporation to cool down hot air. To understand this, imagine a sweaty sensation on a hot summer’s day. The feeling is stifling until you stand in front of a fan, when its breeze evaporates the perspiration, leaving your body cool and dry. This works because heat energy is lost during the chemical conversion of liquid (perspiration) into water vapor.

Evaporative cooling works similarly. Most evaporative air coolers have three core components: a fan, a pump system to circulate water, and a cooling medium that absorbs and retains water. Honeycomb cooling media is commonly used in portable evaporative coolers in the US. Water circulates through the cooler and saturates the honeycomb media. The fan draws incoming warm air through the media, where evaporation converts water into water vapor and blows out colder air on the other side.