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Q2. In a Diesel cycle the polytropic compression ratio is 15 and the heat energy supplied at constant pressure is 1 MJ/kg.

The initial pressure and temperature of the air at the start of compression are 1 bar and 15°C respectively.

Calculate EACH of the following:

(a) the temperatures at all points;

(b) the cycle thermal efficiency.

Note: For compression: n = 1.35, for expansion: n = 1.25

C_v = 0.718 kJ/kgK and C_p = 1.005 kJ/kgK R = 0.287 kJ/kgK