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in Physics by (63.3k points)

A steam turbine inlet is at 200 psia, 900 F. The exit is at 40 psia, 600 F. What is the isentropic efficiency? 

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Inlet: hin = 1477.04 Btu/lbm,

sin = 1.8055 Btu/lbm R

Exit: hex = 1333.43 Btu/lbm,

sex = 1.8621 Btu/lbm R

Ideal Exit: 40 psia, s = sin = 1.8055 Btu/lbm R

⇒ hs = 1277.0 Btu/lbm

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