﻿ Compressed air theory
 COMPRESSED AIR THEORY With the cooperation and under supervision of our past president  Ir. H. Ghys Free air delivery: FAD m3/min l /s Capacity of compressor, expressed in free air volume at atmospheric conditions. Air delivery m3/min l /s Volume of air delivery at the outletcoks of the compressor, in compressed air conditions. l/s = 1000/60 m3/min Normal flow m3/min Volume of air delivery at following ambient conditions: 0°C and 1.013 bar(a)(sea level) General gas law P x v / T = R = constant  or  P x V/T = m x R' Pressure Bar(a)(absolute)  V: volume (m3)  v: specific volume (m3/kg) T : absolute temperature  °K m : mole mass (Kmol) R : individual gas constant = 287,1 J/(Kg K)  R' : universal gas constant = 8314 (J/(Kmol K)  R = R'/m Po x Vo/To = Pi x Vi/Ti Po, Pi : Pressure in bar(a)  (absolute) To, Ti : absolute temperature in K (K = 273 + t°C)  R = gasconstant = 287.1  J/(Kg K) Calculation input conditions: Vo =   l/s Po = bar(a) to =    °C outlet conditions: Pi = bar(a) ti =    °C air delivery Vi at outlet conditions  Vi =  l/s