Chapter 13, Problem 13.8E

Consider the combined gas-steam power cycle. The topping cycle is a gas-turbine cycle that has a pressure ratio of 8. Air enters the compressor at 300 K and the turbine at 1300 K. The isentropic efficiency of the compressor is 80%, and that of the gas turbine is 85%. The bottoming cycle is a simple Rankine cycle operating between the pressure limits of 7 MPa and 5 kPa. Steam is heated in a heat exchanger by the exhaust gases to a temperature of 500°C and the isentropic efficiency of the turbine is 90 %. The exhaust gases leave the heat exchanger at 450 K. Considering the mass flow rate steam as 1 kg/s, determine: A) Net power, B) Total input heat, C) Total entropy generation, D) Energy efficiency, E) Exergy efficiency, F) T-s diagram Solve by EES Compressor Air -③ in Exhaust gases Pump Combustion chamber Gas turbine Gas cycle Heat exchanger Condenser Steam Steam turbine cycle

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