8.4 If the expansion processes in the turbines of Problem 8.3 have isentropic efficiencies of 84% and 78% respectively, in the first and second stages, calculate the work output and the heat supplied per kilogram of steam, the cycle efficiency, and the specific steam consumption. Compare the efficiencies and specific steam consumptions obtained from Problems 8.1, 8.2, 8.3, and 8.4. Compare also the wetness of the steam leaving the turbines in each case. (1028 kJ; 3311 kJ; 31.1%; 3.5 kg/kW h) (Dryness fractions at condenser in each case: 0.699, 0.762, 0.85, and 0.94.) tnut of 200 MW. The superheat outlet pressure
8.4 If the expansion processes in the turbines of Problem 8.3 have isentropic efficiencies of 84% and 78% respectively, in the first and second stages, calculate the work output and the heat supplied per kilogram of steam, the cycle efficiency, and the specific steam consumption. Compare the efficiencies and specific steam consumptions obtained from Problems 8.1, 8.2, 8.3, and 8.4. Compare also the wetness of the steam leaving the turbines in each case. (1028 kJ; 3311 kJ; 31.1%; 3.5 kg/kW h) (Dryness fractions at condenser in each case: 0.699, 0.762, 0.85, and 0.94.) tnut of 200 MW. The superheat outlet pressure
Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Solve question 8.4 in the given image.

Transcribed Image Text:8.3 Steam is supplied to a two-stage turbine at 40 bar and 350°C. It expands in the first
turbine until it is just dry saturated, then it is re-heated to 350°C and expanded through
the second-stage turbine. The condenser pressure is 0.035 bar. Calculate the work output
and the heat supplied per kilogram of steam for the plant, assuming ideal processes and
neglecting the feed-pump term. Calculate also the specific steam consumption and the
cycle efficiency.
(1290 kJ; 3362 kJ; 2.79 kg/kW h; 38.4%)
8.4 If the expansion processes in the turbines of Problem 8.3 have isentropic efficiencies of
84% and 78% respectively, in the first and second stages, calculate the work output
and the heat supplied per kilogram of steam, the cycle efficiency, and the specific
steam consumption.
Compare the efficiencies and specific steam consumptions obtained from Problems &.1,
8.2, 8.3, and 8.4. Compare also the wetness of the steam leaving the turbines in each
case.
(1028 kJ; 3311 kJ; 31.1%; 3.5 kg/kW h)
(Dryness fractions at condenser in each case: 0.699, 0.762, 0.85, and 0.94.)
of 200 MW. The superheat outlet pressure
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