A three-stage reciprocating air compressor compresses 0,3m³ of air per second, from an intake pressure of 90kPa and temperature of 22°c, to a pressure of 2MPa. Intercooling is complete, and the stage pressures are in geometric progression for the maximum efficiency. R=0,288kj/kg*k; cp= 1,005 kj/kg. k; compression index n=1,3.
Determine:
3.1 The power required to drive the compressor if mechanical efficiency of 90% is assumed.