The answers should be that in the below of question. I need complete answers. St

Question

The answers should be that in the below of question. I need complete answers.

Steam is supplied to a two-stage turbine at 40 bar and 350 degree C. It expands in the first turbine until it is just dry saturated, then it is reheated to 350 degree C and expanded through the second-stage turbine. The condenser pressure is 0 middot 035 bar. Calculate the work output and the heat supplied per kg 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 middot 79 kg/kW h; 38 middot 4%)

Explanation / Answer

Refer http://www.waterproperties.eu for data and interpolation P1 = 40 bar T1 = 350 deg Celsius h1 = 3093.08 kJ/kg s1 = 6.5838 kJ/kgK x2 =1 s2 = 6.5838 kJ/kgK T2 = 180 deg Celsius h2 = 2777.07 kJ/kg (Thro interpolation) P2 = 10.02700 bar P3 = 10.02700 bar T3 = 350 deg Celsius h3 = 3157.65 kJ/kg s3 = 7.3005 kJ/kgK P4 = 0.035 bar s4 = 7.3005 kJ/kgK h4 = 2183.56 kJ/kg P5 = 0.035 bar x5 = 0 (condenser exit) h5 = 111.84 kJ/kg Neglect Pump Work therefore Q (boiler ) = (3093.08 - 111.84) + (3157.65-2777.07) = 3361.82 kJ/kg W (turb) = (3093.08 - 2777.07) + (3157.65 - 2183.56) = 1290.1 kJ/kg Eff = 1290.1/3361.82 = 0.38375 Spec. Steam Consumption = 3600/Work = 3600/1290.1 = 2.7904 kg/kWhr

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