Saturated compressed air enters the Pre-cooler / Re-heater, where it is pre-cooled by exchanging heat with the out going cold air, which reduces head load to evaporator. the inlet air is further cooled in the evaporator to the required dew point. The cold air is then reheated when it passes back through the air-to-air heat exchanger.
A refrigerant compressor and condenser supply low temperature refrigerant to the evaporator. The thermostatic expansion value and the hot gas bypass valve math the operation of the refrigerant system to the compressed air cooling loa. The process cools the air, reducing its capacity to hold water vaper and resultin in moisture condensation.