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Q13. An air standard dual combustion cycle operates with a minimum temperature and pressure of 30°C and 0.98 bar respectively. The volume compression ratio is 23/1. The maximum pressure is 90 bar and the maximum temperature is 1430°C.

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

(b) Calculate the thermal efficiency of the cycle.

Note: For air, γ = 1.4 and R = 0.287 kJ/kg K.