Fig. P6.176 shows a vapor power plant operating at steady

Chapter 6, Problem 6.176

(choose chapter or problem)

Fig. P6.176 shows a vapor power plant operating at steady state. Data at key locations are given on the figure. The turbine and pump operate adiabatically, and kinetic and potential energy effects can be neglected. The isentropic pump efficiency is 90%. For such a vapor power cycle, the back work ratio is the ratio of the pump work input to the turbine work output. Determine the back work ratio

(a) using data interpolated from Table A-5 to obtain the specific enthalpy at state 4

(b) using the approximation of Eq. 6.51c to obtain the specific enthalpy at state 4.

Compare the results of parts (a) and (b) and discuss

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