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a hypothetical (and impossibly perfect) combined-cycle power plant operates at its thermodynamic efficiency limit of 81%

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a hypothetical (and impossibly perfect) combined-cycle power plant operates at its thermodynamic efficiency limit of 81%. It dumps waste heat from its steam cycle at 5°C. (a) What's the maximum temperature in its gas turbine? If the gas turbine cycle alone has 63% thermo- dynamic efficiency, what are (b) the intermediate tem- perature and (c) the thermodynamic efficiency of the steam cycle alone?