Answer: Using Isentropic Processes/EfficienciesAs shown in
Chapter 6, Problem 167P(choose chapter or problem)
As shown in Fig. P6.167, a well-insulated turbine operating at steady state has two stages in series. Steam enters the first stage at \(800^{\circ} \mathrm{F}, \ 600 \mathrm{\ lbf} / \mathrm{in}^ .{2}\) and exits at \(250 \mathrm{\ lbf} / \mathrm{in} .^{2}\) The steam then enters the second stage and exits at \(14.7 \mathrm{\ lbf} / \mathrm{in} .^{2}\) The isentropic efficiencies of the stages are 85% and 91%, respectively. Show the principal states on a T–s diagram. At the exit of the second stage, determine the temperature, in \({ }^{\circ} \mathrm{F}\), if superheated vapor exits or the quality if a two-phase liquid–vapor mixture exits. Also determine the work developed by each stage, in Btu per lb of steam flowing.
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