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Q3. A single acting THREE stage reciprocating compressor is designed for minimum work with perfect intercooling. It delivers 0.2 kg/s of air from initial conditions of 1.0135 bar and 5°C and has a volume compression ratio of 3.58 for each stage according to the law PV^1.25 = C.

(a) Draw graph PV diagram showing intercooling. (3)

(b) Calculate EACH of the following:

(i) EACH stage delivery pressure; (5)

(ii) the total indicated power; (5)

(iii) the total rate of heat removed in the intercoolers. (3)

Note: For air γ = 1.4 and C_p = 1.005 kJ/ kg K,  C_v = 0.718 k. I/ kg K.