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The Refrigeration air dryer manufacturers operates on the premise that the condensation of water that is carried by compressed air in the form of vapour occurs when compressed air is cooled. There are two stages of cooling in the refrigerated air dryer. The compressed air enters the refrigerated type of air dryer at around 40 degrees Celsius. It first enters the pre-cooler, where the outgoing cool, dry air cools the ingoing hot, wet air.