A single acting two-stage reciprocating air compressor is to compress air from 1 kg/cm2 and 30°C to 12.25 kg/cm2. The bore of the low pressure cylinder is 30 cm. The stroke length of both the low and the high pressure cylinders is the same and is equal to 40cm. The compressor runs at 180 r.p.m. The clearance volume in both the cylinders is 3% of the stroke volume. Index of adiabatic compression and expansion is 1.3 in both the cylinders. Determine the shaft horse power required to drive the compressor when (i) the air is cooled to its initial temperature before entering the h.p. cylinder, (ii) when the air is cooled to 45°C in the intercooler. Assume mechanical efficiency to be 85% in both cases. Also assume R = 29.27 kgf-m/kg K.