A single-acting reciprocating air compressor has a clearance volume of 10%. Air is received at 90 kPa and 29.3C and is discharged at 600 kPa. The compression and expansion are polytropic with n = 1.28. The pressure drop is 5 kPa at the suction port and 10 kPa at the discharge port. The compressor piston displacement is 500 cm2 when operating at 900 rpm.

Find:

(a) The mass of air compressed in kg/hr and

(b) The required compressor power in kW.