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The maximum water content in saturated air depends on air pressure and temperature.


100 m3 of free air is entering a compressor at atmospheric conditions with 20oC and 70% water content. The air is leaving saturated at gauge pressure 8 bar and 50oC.
Based on the diagram above the entering water content can be estimated to aprox. 1.8 kg per 100 m3 free air. 70% of this maximum content is 1.26 kg per 100 m3.
The water content in the leaving air can be estimated to aprox. 0.9 kg per 100 m3 free air.
The difference, 1.26 - 0.9 = 0.36 kg per 100 m3 free air, is extracted in the compressor.
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