Vapor Cycle Exergy Analysis
Determine the rate of exergy input, in Btu/h, to the working fluid passing through the steam generator in Problem 8.75. Perform calculations to account for all outputs, losses, and destructions of this exergy. Let T0 = 60°F, p0 = 14.7 lbf/in.2
Problem 8.75
Analyzing Regenerative Cycles
Steam enters the first turbine stage of a vapor power plant with reheat and regeneration at 1800 lbf/in.2, 1100°F and expands in five stages to a condenser pressure of 1 lbf/in.2 Reheat is at 100 lbf/in.2 to 1000°F. The cycle includes three feedwater heaters. Closed heaters operate at 600 and 160 lbf/in.2, with the drains from each trapped into the next lower-pressure feedwater heater. The feedwater leaving each closed heater is at the saturation temperature corresponding to the extraction pressure. An open feedwater heater operates at 20 lbf/in.2 The pumps operate isentropically, and each turbine stage has an isentropic efficiency of 88%.
(a) Sketch the layout of the cycle and number the principal state points.
(b) Determine the thermal efficiency of the cycle.
(c) Determine the heat rate, in Btu/kW · h.
(d) Calculate the mass flow rate into the first turbine stage, in lb/h, for a net power output of 3 × 109 Btu/h.
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