DieselShip's Online Content Library

Q3. A single acting, 2-stage reciprocating air compressor with equal stage pressure ratios is designed to with perfect intercooling. The compressor delivers 7.4 m/min of air from initial conditions of 0.90 bar and 290 K. The index of both compression and expansion is 1.25 for both stages. The final delivery pressure is 10.50 bar.

(a) Draw the p-V diagram of the compressor. (3)

(b) Calculate EACH of the following.

(i) the indicated power.(9)

(ii) the rate of intercooling (2)

(c) If the clearance ratio is 0.0025 find the volumetric efficiency. (2)

Note: For Air c_p = 1005 J/kgK, c_v = 718 J/kgK