Properties of Compressed Air[ back to full computer program list ]1. Compressor Inlet Air – Engineer Inputs To The Program
a. Barometric Pressure: 14.70 psi b. Gage Pressure: 0.00 psig c. Dry Bulb: 60 F d. Relative Humidity: 35 % (or twb, tdp or Humidity Ratio) e. ACFM: 546.7183 (or CAGI SCFM or Mass Flow of Dry Air) 2. Compressor Discharge Air - Engineer Inputs To The Program
a. Barometric Pressure: 14.70 psi b. Gage Pressure: 100.00 psig c. Dry Bulb: 176 F (Must be provided by the manufacturer or calculated) d. Humidity Ratio: 0.003820 lb w.v./lb dry air
The humidity ratio is the same as the inlet air provided that the compressed
air can handle this much water vapor.
e. Mass Flow of Dry Air: 2489.00 lbs dry air/hr
The mass flow of dry air is the same as the inlet air unless the compressor
has leakage in which case the leakage must be subtracted from the inlet dry
air mass flow to get the discharge dry air mass flow.
3. Aftercooler Air Discharge – Engineer Inputs To The Program
a. Barometric Pressure: 14.70 psi
b. Gage Pressure: 95.50 psig (Loss of 4.50 psi across the aftercooler) c. Dry Bulb: 67 F (Specified by the Aftercooler Company) d. Humidity Ratio W (lb/lb) :
Due to the reduced temperature the air cannot carry the inlet humidity ratio
of 0.003820 lb/lb. Thus the leaving humidity ratio is calculated assuming the
leaving air is at 100 % Relative Humidity at 95.50 psig or a Humidity Ratio
of 0.001855 lb/lb.
e. Mass flow of Dry Air: 2489 lbs dry air/hr (Provided there is no leakage)
COMP-IN.txt
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