Reconsider Problem 8.6, but include in the analysis that the turbine and pump each have isentropic efficiencies of (a) 90%, (b) 80%, (c) 70%. Answer the same questions for the modified cycle as in Problem 8.6.

Reconsider the cycle of Problem 8.13, but insert a throttling valve between the steam generator and the turbine that reduces the turbine inlet pressure to 1000 lbf/in.2 but does not change the mass flow rate. Answer the same questions about the modified cycle as in Problem 8.13.

Steam enters the turbine of a simple vapor power plant with a pressure of 10 MPa and temperature T, and expands adiabatically to 6 kPa. The isentropic turbine efficiency is 85%. Saturated liquid exits the condenser at 6 kPa and the isentropic pump efficiency is 82%.

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(a) For T 580C, determine the turbine exit quality and the cycle thermal efficiency.

(b) Plot the quantities of part (a) versus T ranging from 580 to 700C.

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