Question

3.6 A combined power plant consisting of a closed cycle GT unit (Brayton cycle), using air as the working fluid and a ST unit (Rankine cycle) is to be designed such that the heat rejected at the GT unit is to be utilized to produce steam at the generator for the ST. The air leaving the generator is at 200 °C and it is cooled to the compressor inlet temperature by a second cooler which rejects the heat to waste. Draw the flow and T-s diagram of the plant and calculate on the basis of ideal cycles, neglecting the feed pump work of the Rankine cycle, (a) the mass flow rate of steam per kg/s of air flow, (b) the total power output per kg/s of air flow, and (c) the overall efficiency of the plant. Take cp of air as 1.005 kJ kg K and y 1.4. The particulars of each cycle are as foliows: GT cycle (Brayton)ST cycle (Rankine) 0.07 Pressure (bar) min 30 max 20 Temperature (Cmin 300 830 max [Ans. (a) 0.0762 kg/s, (b) 314.78 kJ/kg, (c) 49%)

Answer 1

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