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Q2. In The open cycle gas turbine plant shown in Fig Q2. Air is compressed from a pressure and temperature of 0.95 bar and 15℃ respectively through a pressure ratio of 6 with an isentropic efficiency of 0.8.

The turbine has an entry temperature of 850℃ and expands the gas to the original pressure with an isentropic efficiency of 0.88.

A regenerator with a thermal ratio of 0.7 is used to heat the air before it enters the combustion chamber.

The mass flow of fuel may be ignored.

(a) Calculate EACH of the following

(i) The work ratio; (8)

(ii) The Thermal efficiency. (4)

(b) Sketch The cycle on a Temperature- specific entropy diagram (4)

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

For combustion gas γ = 1.33 and c_p = 1.15  kJ⁄(kg K)