A combined Brayton-Rankine cycle receives air at 540 R and 1 atm into its air compressor. The air is compressed to 12 atm and then heated in the combustor to 2300°F. The air expands in the gas turbine to 1 atm and is then sent through a heat exchanger to transfer heat to the steam in the Rankine cycle. The air exits the heat exchanger at 150°F. The mass flow rate of the air through the cycle is 200 lbm/s. Steam exits the steam generator at 1000°F and 2800 psia. The condenser pressure is 3 psia. The air turbine and compressor both have isentropic efficiencies of 0.78, and the steam turbine isentropic efficiency is 0.75 whereas the pump isentropic efficiency is 0.70. Plot the ratio of the mass flow rate of the steam to the air, the additional amount of supplemental heating required by the Rankine cycle, and the thermal efficiency of the combined cycle for combined cycle net power outputs ranging between 100 MW and 400 MW.
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