Refrigerated Dryers works on Heat Transfer principle. Saturated compressed air enters the Pre-cooler / Re-heater (air to air heat-exchanger), where it is pre-cooled by exchanging heat with the outgoing cold air, which reduces heat load to the evaporator. The inlet air is further cooled in the evaporator (air to the refrigerant heat exchanger) to the required dew point. 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 evaporator. The thermostatic expansion valve and the hot gas bypass valve match the operation of the refrigerant system to the compressed air cooling load. In the evaporator, heat is transferred from the compressed air into the refrigerant.
The process cools the air, reducing its capacity to hold water vapor and resulting in moisture condensation. The excess vapor condenses and is removed from the air system by a separator and automatic drain valve. Our consistency in continuous improvement in design for renovating small model results into tube-in-tube type dryer. The copper tube-in-tube design provides a maximum surface area which results in optimum heat transfer