At steady state, a valve and steam turbine operate in

Chapter 4, Problem 4.92

(choose chapter or problem)

At steady state, a valve and steam turbine operate in series. The steam flowing through the valve undergoes a throttling process. At the valve inlet, the conditions are \(600 \mathrm{lbf} / \mathrm{in.}^{2}\), \(800^{\circ} \mathrm{F}\). At the valve exit, corresponding to the turbine inlet, the pressure is \(300 \mathrm{lbf} / \mathrm{in.}^{2}\) At the turbine exit, the pressure is \(5 \mathrm{lbf} / \mathrm{in}^{2}\) The work developed by the turbine is 350 Btu per lb of steam flowing. Stray heat transfer and kinetic and potential energy effects can be ignored. Fix the state at the turbine exit: If the state is superheated vapor, determine the temperature, in \({ }^{\circ} \mathrm{F}\). If the state is a two-phase liquid–vapor mixture, determine the quality.