# Problem 9-1 - Example 9-1 A Rankine cycle using steam as...

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Example 9-1 A Rankine cycle using steam as the working fluid is executed as in the schematic: a) Find the cycle efficiency b) Draw a T-s diagram Solution: Begin with the turbine: 3 Btu entropy(steam, 900, 400) 1.725 lbm R sT P == = = 43 Btu 1.725 lbm R s ss 4 Btu enthalpy(steam, 1.725, 20) 1152 lbm s hs P = = 3 Btu enthalpy(steam, 900, 400) 1470 lbm hT P = =

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() 34 T Ts W hh m η =− ± ± Btu Btu 0.87 1470 1152 277 lbm lbm T W m =−= ± ± , ,3 4 Ta c t T T ideal s W Wh h == ± ± 4 1470 0.87 1470 1152 h = 4 Btu 1193 lbm h = For the condenser 41 L Qm h h ± ± 1 Btu enthalpy(steam, 0, 20) 196 lbm hx P = = Btu 1193 196 997 lbm L Q m = ± ± For the pump 21 P W vP P m ± ± 3 ft volume steam, 20, 0 0.0168 lbm vP x = = 3 23 ft lbf 1 Btu 0.0168 400 20 lbm in 5.404 psia ft P W
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Problem 9-1 - Example 9-1 A Rankine cycle using steam as...

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