110702_rec9

110702_rec9 - Page 1 of 1 Problem 2 A Rankine-cycle power...

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16.050 Thermal Energy Recitation #9 – Fall 2002 Problem 1: A power plant operates on a Rankine cycle with steam as the working fluid. Both the pump and the turbine are ideal. Assume that the working fluid leaves the condenser as a saturated liquid at 1 bar. Calculate the net power for 1 kg/s of steam and the thermal efficiency when the steam at the beginning of expansion is at 50 bar and (a) saturated, (b) 350 o C, and (c) 640 o C. Show all three cycles on the same T-s diagram. Neglect kinetic energy changes and pressure drops.
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Unformatted text preview: Page 1 of 1 Problem 2: A Rankine-cycle power plant has one stage of reheat. The turbine inlet is 5 MPa at 500 o C. After expansion to 0.5 MPa the steam is reheated to 500 o C and expanded in a second turbine to a condenser pressure of 7.5 kPa. The steam leaves the condenser as saturated liquid. Calculate the cycle efficiency, using a pump efficiency of 0.6 and turbine efficiencies of 0.8. Neglect kinetic energy changes and pressure drops. Page 2 of 2...
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110702_rec9 - Page 1 of 1 Problem 2 A Rankine-cycle power...

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