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Q9. Air at a pressure and temperature of 1 bar and 32ºC respectively is compressed in an isentropic process from BDC to TDC in an engine. Heat is then added reversibly at constant volume until the pressure reaches 35.5 bar.

The clearance volume is 1.82 litres and the bore and stroke are 250 mm and 350 mm respectively.

(a) Sketch the p-V and T-s diagrams.

(b) Calculate EACH of the following:

(i) The compression ratio

(ii) The work transfer

(iii) The total change in entropy.

Note: For air C_v = 0.718 kJ/kgK and R = 0.287 kJ/kgK