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Q3) A single acting 3 stage reciprocating compressor is designed for minimum work with perfect intercooling. It delivers 0.11 kg/s of air from initial conditions of 1.06 bar and 15℃ and has a volume compression ratio of 3.5 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 C_p = 1.005 kJ/kg K ; C_v = 0.718 kJ/kg K