The air discharged by a compressor always contains water vapor, which also depends on the ambient temperature and the relative humidity. When the air is compressed, the volume decreases proportionally. This results in condensate formation. The condensate causes corrosion in the compressed air line. Dryers of compressed air are used to separate the condensates. The refrigerated air dryer eliminates moisture from the compressed air at the desired dew point temperature.
The performance of a dryer is quoted in terms of "pressure dew point", which is the temperature at which water vapor will begin to condense out of the air. For example, a dew point of 4 ° C to 7 bar (g) (700kPa (g)) means that no water will condense from the air until it is below a temperature of 4 ° C.
Principle of operation:
The saturated compressed air enters the air-to-air heat exchanger. Here, the incoming hot air is cooled by the outgoing cold air. The pre-cooled incoming air enters the air-refrigerant heat exchanger, further reducing the air temperature to a specified dew point of 2 ° C to 4 ° C. Air exiting this evaporator is directed to The cyclone separators and the steam condensate liquid droplets are automatically
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