Using Isentropic Processes/EfficienciesWater vapor at 800

Chapter 6, Problem 138P

(choose chapter or problem)

Water vapor at \(800 \mathrm{\ lbf} / \mathrm{in} .{ }^{2}, \ 1000^{\circ} \mathrm{F}\) enters a turbine operating at steady state and expands adiabatically to \(2 \mathrm{\ lbf} /\text { in. }{ }^{2}\), developing work at a rate of 490 Btu per lb of vapor flowing. Determine the condition at the turbine exit: two phase liquid–vapor or superheated vapor? Also, evaluate the isentropic turbine efficiency. Kinetic and potential energy effects are negligible.

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