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Q13. (a) Sketch the p-V diagram for a two-stage reciprocating air compressor, indicating the area which represents the work saved by intercooling.

(b) In a two-stage reciprocating air compressor, the LP suction pressure is 1.02 bar and the HP delivery pressure is 10.5 bar. The LP suction temperature is 303 K. The index of compression and expansion is 1.3. The HP suction temperature is 310 K, and the HP suction pressure is 3.5 bar.

Determine EACH of the following:

(i) The indicated work per kg of air;

(ii) The heat removed in the intercooler per kg of air;

(iii) The isothermal efficiency.

Note: For air, R = 0.287 kJ/kg K and C_p = 1.005 kJ/kg K.