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Q2. Air enters an open cycle gas turbine plant at a pressure and temperature of 0.95 bar and 15℃ respectively. It is the n compressed to a pressure of 12 bar in two stages of equal pressure ratio with perfect intercooling.

The combustion products enter the single stage turbine at a pressure of 12 bar and temperature of 980℃ and leave at a pressure of 0.95 bar.

The isentropic efficiency of each compressor stage is 0.8.

The isentropic efficiency of turbine is 0.85.

The air to fuel ratio is 70 :1

(a) Sketch The cycle on a temperature – specific entropy diagram (4)

(b) Calculate EACH of the following:

(i) The specific network output; (7)

(ii) The cycle thermal efficiency. (5)

Note: for air γ = 1.4 and c_p = 1.005  kJ⁄(kg K)

For The combustion products γ = 1.33 and c_p = 1.15  kJ⁄(kg K).