A combined gas turbine–vapor power plant has a net power output of 200 MW. Air enters...

A combined gas turbine–vapor power plant has a net power output of 200 MW. Air enters the compressor of the gas turbine at 300 kPa, 1200 K, and is compressed to 1000 kPa. The pressure ratio of the gas turbine cycle is 11. Steam leaving the turbine of the vapor power cycle are used to heat the steam at 6 MPa to 350C in a heat exchanger. The combustion gases leave the heat exchanger at 420 K. An open feedwater heater incorporated with the steam cycle operates at a pressure of 1 MPa. The condenser pressure is 10 kPa. Assuming isentropic efficiencies of 80 percent for the pump, 82 percent for the compressor, and 80 percent for the gas and steam turbines, determine (a) the mass flow rate ratio of air to steam, (b) the required rate of heat input in the combustion chamber, and (c) the thermal efficiency of the combined cycle.

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samet mamat answered 1 year ago

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