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Fig. 5.7: Over-compression with subsequent relaxation | With over-compression the air is compressed far beyond the necessary pressure, and afterwards cooled and relaxed to operating pressure.
Operating principle
With rising pressure and thus reduced volume the air is able to hold less water. During pre-compression at high pressure a large amount of condensate precipitates. The absolute humidity of the air goes down. If the compressed air is now relaxed, the relative humidity drops and with it the dew point.
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