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The efficient way to get dry compressed air - Refrigerant compressed air dryers


Compressed air dryers are devices for removing moisture from compressed air generated by a compressor. The air taken in by the compressor is a mixture of gases which generally contains water vapour.

The capacity of the air to absorb water varies and depends mainly on the temperature. If the temperature of the air rises, as is the case when air is compacted in the compressor, its capacity to absorb water vapour also increases. This makes it necessary to remove the water from the compressed air.


Compressed air dryers often work on the heat exchange principal. Every refrigerant compressed air dryer has an air-to-air and an air-to-refrigerant heat exchange. The hot compressed air from the compressor initially flows into the air-to-air heat exchanger. There, it is cooled down by the already treated cold compressed air according to the counterflow principal. At the same time, it heats up the already treated compressed air.


The compressed air then flows into the air-to- refrigerant heat exchanger. This consists of two seperate pipelines designed on the counterflow principal. Hot compressed air flows in one pipeline, and in the other a gaseous refrigerant which absorbs the thermal energy from the compressed air. The compressed air is cooled down in this way and looses its ability to absorb water. The resulting condensate is separated from the compressed air by a water separator. It is then discharged from the system in a condensate separator.

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Boge Controls 305 Brochure

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