A two-stage evaporative cooling system is also called as indirect cooling system which uses the latest evaporative cooling system technology. This system is more energy efficient than air conditioning systems.
Two-stage evaporative refers to the stages of cooling that happens in the process. In the first stage the air passes through a heat exchanger where the air is cooled, during this initial phase the air does not pick up any moisture. In the second stage, the same air passes through a dampened pad where the additional cooling takes place and the air picks up some additional humidity.
Two-stage evaporative cooling system use a pre-cooler, more efficient pads, and more efficient motors, and do not add a lot of moisture to the room as compared to single-stage evaporative coolers. As they are expensive as compared to the single stage coolers they are used in areas where the day temperature exceeds 100°F.
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