Problem 8-1 - Example 8-1 In an ideal Rankine cycle with...

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Example 8-1 In an ideal Rankine cycle with steam as the working fluid, saturated vapor enters the turbine at 8 MPa and saturated liquid exits the condenser at 0.008 MPa. The net power output of the cycle is 100 MW. Sketch the cycle on a T-s diagram and find: a) quality at the turbine exit b) mass flow rate of the steam c) heat added in the boiler d) cycle efficiency Note: number your states as in this lecture to avoid confusion. Solution: For the turbine: 34 s s = 3 kJ entropy(steam, 1, 8000) 5.74 kg K sx P == = = () T Wm h h =− ± ±

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3 kJ enthalpy(steam, 1, 8000) 2758 kg hx P == = = 4 kJ enthalpy(steam, 5.74, 8) 1794 kg hs P = = 4 quality(steam, 5.74, 8) 0.675 xs P = = For the pump: ( ) 21 P Wm v P P =− ± ± 3 m volume(steam, 0, 8) 0.001008 kg vx P = = ( ) 34 net T P WW W m h h =−= ±± ± ± () ( ) net h h m v P P ± 6 36 10 W kJ 1000 J m 10 Pa 100 MW 2758 1794 0.001 8 0.008 MPa 1 MW kg 1 kJ kg 1 MPa m ⎛⎞ ⎜⎟ ⎢⎥ ⎝⎠ ± kg 104.7 s m = ± To find pump work: ( ) P v P P ± ± kg m 10 Pa 104.7
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This homework help was uploaded on 04/07/2008 for the course MANE 4010 taught by Professor Kaminski during the Spring '08 term at Rensselaer Polytechnic Institute.

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Problem 8-1 - Example 8-1 In an ideal Rankine cycle with...

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