Indirect Evaporative Cooling (Two Stage Cooling)

The indirect evaporative cooler works on the same principle as a direct evaporative cooler. Instead of cooling pads, a heat exchanger is used to cool the air. This is done by metal tubes which are kept wet on the surface, so once hot air passes through these tubes, water gets evaporated and cools the metal tubes which results in providing cool air to the interior surfaces. Indirect evaporative air coolers consume relatively more electricity compared to direct evaporative air coolers, as two fans are used.

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