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Saturated compressed airenters the precooler / reheater where it is cooled by exchanging heat with the outgoing coldair. The inlet air is further cooled in the chiller/evaporator. The cold air is then reheated when it passes back through the air-to-air heat exchanger (Precooler/Reheater). A refrigerant compressor and condenser supply low - temperature refrigerant to the chiller / evaporator.Expansion device and the hot gas bypass valve match the operation ofthe compressed air cooling load. In the evaporator, heat is transffered from the compressed air into the refrigerant. The process cools the air, reducing its capacity to hold water vapour and resulting in moisture condensation. The excess vapor condenses and is removed from the airstream by a separator and automatic drain valve which forms a part of these refrigerated air dryers.