(Solved): (b) A double-acting air compressol diameter of cylinder 32cm, length of stroke of piston 39 ...

(b) A double-acting air compressol diameter of cylinder $32\mathrm{cm}$, length of stroke of piston $39\mathrm{cm}$ and clearance $5\%$. It runs at 200 r.p.m. and takes in air at 0.94 bar and $25^{?}\mathrm{C}$. The delivery pressure is 4 bar and the index of compression $n=1?25$. The free air conditions are 1.013 bar and $20^{?}\mathrm{C}$. Considering the ratio of specific heats of air to be 14 , calculate the following : (i) The mass of free air delivered (ii) The heat transfer (iii) Enthalpy change (iiv) Power needed to drive