Q1) In a combined gas turbine-steam turbine power plant, the exhaust gas from the open cycle gas turbine is the supply gas to the steam generator of the steam cycle at which additional fuel is burned...

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Extracted text: Q1) In a combined gas turbine-steam turbine power plant, the exhaust gas from the open cycle gas turbine is the supply gas to the steam generator of the steam cycle at which additional fuel is burned in the gas. The pressure ratio for the gas turbine is 7.5, the air inlet temperature is 15 °C and the maximum cycle temperature is 750 °C. Combustion of additional fuel raises the gas temperature to 755 °C and the gas leaves the steam generator at 110 °C. the steam is supplied to the turbine at 50 bar, 600 °C and the condenser pressure is 0.15 bar. The total power output of the plant is 200 MW. The calorific value of the fuel burned is 43.3 MJ/kg. Neglecting the effect of the mass flow rate of the fuel on the air flow, determine, (a) the flow rates of air and steam required. (b) the power outputs of the gas turbine and steam turbine, (c) the thermal efficiency of the combined plant. (d) the air fuel ratio. Take Cp= 1.12 kJ/kg K and K= 1.32 for combustion gases, and Cp= 1.005 kJ/kg K and K 1.4 for air. Neglect pump work. %3D