An ideal Rankine cycle with reheat uses water as the working fluid. The conditions at the inlet to the first turbine stage are 1600 lbf/in.2 , 1200F and the steam is reheated between the turbine stages to 1200F. For a condenser pressure of 1 lbf/in.2 , plot the cycle thermal efficiency versus reheat pressure for pressures ranging from 60 to 1200 lbf/in.2
Modify the ideal Rankine cycle of Problem 8.2 to include one closed feedwater heater using extracted steam at 0.7 MPa. Condensate drains from the feedwater heater as saturated liquid at 0.7 MPa and is trapped into the condenser. The feedwater leaves the heater at 8 MPa and a temperature equal to the saturation temperature at 0.7 MPa. Answer the same questions about the modified cycle as in Problem 8.2 and discuss the results.
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