solution

Reconsider the cycle of Problem 8.33, but include in the analysis that each turbine stage has an isentropic efficiency of 82%. The pump efficiency remains 100%.

Modify the ideal Rankine cycle of Problem 8.7 to include one closed feedwater heater using extracted steam at 100 lbf/in.2 Condensate exiting the heater as saturated liquid at 100 lbf/in.2 passes through a trap into the condenser. The feedwater leaves the heater at 1200 lbf/in.2 and a temperature equal to the saturation temperature at 100 lbf/in.2 The mass flow rate of steam entering the first-stage turbine is the same as the steam flow rate in Problem 8.7. Answer the same questions about the modified cycle as in Problem 8.7 and discuss the results.