Find the maximum possible efficiency of cycles, Physics

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High temperatures and pressures are given for the following power plants.

ISU co-generation:   400 psi, 750F

City of Ames with RDF:   700 psi, 850F

Super-critical power plant  3500 psi, 1100F

Assuming a low temperature of 75F, find the maximum possible efficiency of each of these 3 cycles. 


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