Abstract
This work developed the stage-exergy rate diagrams for determining feasible operating conditions in binary distillation columns and studied the effects of key process parameters on the stage-exergy rate diagrams, energy and exergy efficiencies, and irreversibility rate at various conditions. HYSYS (2003) process simulation software and Microsoft EXCEL spreadsheet were used for process analysis. The stage-exergy rate diagram was found to be a very useful thermodynamic tool, which should be used to compliment exergy efficiency results in exergy studies. Increase in reference temperature was found to decrease the exergy efficiency and to increase the irreversibility rate of the distillation unit.
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