Pressure and Maximum Content of Water in Saturated Air

Air pressure and maximum content of water in saturated air

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

Gauge Pressure in bar

mass of water (kg per 100 m3) in saturated air

Gauge Pressure in psi

mass of water (lb per 100 ft3) in saturated air

Example - Water Extracted from an Air Compressor

100 m3 of free air enters a compressor at atmospheric conditions 20oC and 70% water content. The air leaves saturated at gauge pressure 8 bar and 50oC.

Based on the diagram above the water content in the entering air can be estimated to approximately 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 approximately 0.9 kg per 100 m3 free air.

The difference

    (1.26 kg) - (0.9 kg) per 100 m3 free air

        = 0.36 kg per 100 m3 free air

is extracted in the compressor.

Related Topics

  • Air Psychrometrics - The study of moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content
  • Gases and Compressed Air - Air, LNG, LPG and other common gas properties, pipeline capacities, sizing of relief valves

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