5. As shown in the figure, a well-insulated turbine operating at steady state has two stages...

 

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5. As shown in the figure, a well-insulated turbine operating at steady state has two stages in series. Steam enters the first stage at 800°F, 600 lbf/in? and exits at 250 lbf/in?. The steam then enters the second stage and exits at 14.7 lbf/in? 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 °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. Nu = 85% N12 = 91% 3 First-stage turbine Second-stage turbine Steam P1 = 600 lbf/in.2 T = 800°F P2 = 250 lbf/in.? P3 = 14.7 lbf/in.? 5. As shown in the figure, a well-insulated turbine operating at steady state has two stages in series. Steam enters the first stage at 800°F, 600 lbf/in? and exits at 250 lbf/in?. The steam then enters the second stage and exits at 14.7 lbf/in? 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 °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. Nu = 85% N12 = 91% 3 First-stage turbine Second-stage turbine Steam P1 = 600 lbf/in.2 T = 800°F P2 = 250 lbf/in.? P3 = 14.7 lbf/in.?