Using Exergetic Efficiencies
Steam at 400 lbf/in.2, 600°F enters a well-insulated turbine operating at steady state and exits as saturated vapor at a pressure p.
(a) For p = 50 lbf/in.2, determine the exergy destruction rate, in Btu per lb of steam expanding through the turbine, and the turbine exergetic and isentropic efficiencies.
(b) Plot the exergy destruction rate, in Btu per lb of steam flowing, and the exergetic efficiency and isentropic efficiency, each versus pressure p ranging from 1 to 50 lbf/in.2
Ignore the effects of motion and gravity and let T0 = 60°F, p0 = 1 atm.
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