The overall performance of an air-turbine steam-turbine combined-cycle power plant that is similar to a recent invention has been studied based on first-law as well as second-law analysis. It has been shown that the prerequisite for such a power plant to achieve a high overall performance is an air-turbine air-heater system having a high second-law efficiency which is not sensitive to the compressor compression ratio of the air-turbine cycle. For optimum performance, a moderate cycle pressure ratio (say 8 to 14) may be used for TIT of 1700°F (926.7°C).

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