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a steam is supplied dry saturated at 40 bar to...

Question: a steam is supplied dry saturated at 40 bar to...

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(a) Steam is supplied, dry saturated at 40 bar to a turbine and the condenser pressure is 0.035 bar. If the plant operates on the Rankine cycle, calculate, per kilogram of steam: 1 (i) the work output neglecting the feed-pump work; work required for the feed pump; iii) the heat transferred to the condenser cooling water, and the amount of cooling water required through the condenser if the temperature rise of the water is assumed to be 5.5 K; (iv) the heat supplied; (v) the Rankine efficiency; (vi) the specific steam consumption. (b) For the same steam conditions calculate the efficiency and the specific steam consumption for a Carnot cycle operating with wet steam. 2 Repeat Problem 1(a) for a steam supply condition of 40 bar and 350 C and the same condenser pressure of 0.035 bar. 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 supplicd 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 4 If the expansion processes in the turbines of Problem 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 2, 3, and 4. Compare also the wetness of the steam leaving the turbines in each case Specific steam consumption (ssc)

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