Desiccant dryers work on the basis of absorption of water through desiccant material. Multiple types of desiccant dryers are used in facilities, but usually either heat regenerative or non-heat regenerative. The dryers with no heat use a portion of the dried air to regenerate the desiccant material. The heat regenerative dryers use an electric heat disk, which lessens the amount of purge air needed for regeneration.
Refrigerant dryers cool the compressed air, so that a substantial amount of water condenses and separates. The compressed air is then heated so that condensation does not develop on the outside of the air piping system.
The compressed air cooling takes place inside the coolant system, where a refrigerant cooling agent is utilized. Refrigerant dryers use gasses that are not harmful to the environment. The process of cooling the compressed intake air with the chilled outgoing air in the heat exchanger, the energy of the refrigerant dryer is lessened.
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