Consider the combined gas-steam power cycle shown in the Figure below. The topping cycle is a gas-turbine cycle that has

[answerhappygod]

Consider The Combined Gas Steam Power Cycle Shown In The Figure Below The Topping Cycle Is A Gas Turbine Cycle That Has 1 (194.81 KiB) Viewed 35 times

Consider the combined gas-steam power cycle shown in the Figure below. 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 ideal 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. The exhaust gases leave the heat exchanger at 450 K. Determine: (i) The ratio of the mass flow rates of the steam and the combustion gases and, (ii) The thermal efficiency of the combined cycle. Ans: (a) y=0.131, (b) n=48.7%