An air compressor (4 3/16” x 3 ½”), single stage, operating at 400 rpm is required to deliver compressed air at a pressure of 800 KPaa. The intake pressure and temperature are 100 KPaa and 21oC respectively. Assuming that the compression and expansion follow the law of polytropic by pV1.3 = constant while the clearance is 5%. Calculate the Indicated Power, KW