Discussion
Assertion (A): An exergy analysis is more informative than an energy balance for identifying where a plant wastes its resources.
Reason (R): An energy balance treats a kilojoule of low temperature heat as equal to a kilojoule of work.
Answer: D
Both are true and the reason gives the deficiency: energy is conserved everywhere, so an energy balance cannot point to a loss, whereas exergy is destroyed exactly where the irreversibility is. It puts a work value on each loss in the flowsheet.
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