Using Exergetic Efficiencies
An insulated steam turbine at steady state can be operated at part-load conditions by throttling the steam to a lower pressure before it enters the turbine. Before throttling, the steam is at 200 lbf/in.2, 600oF. After throttling, the pressure is 150 lbf/in.2 At the turbine exit, the steam is at 1 lbf/in.2 and a quality x. For the turbine, plot the rate of exergy destruction, in kJ per kg of steam flowing, and exergetic efficiency, each versus x ranging from 90 to 100%. Ignore the effects of motion and gravity and let T0 = 60oF, p0 = 1 atm.
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