Discussion
Availability or exergy of a stream is defined relative to
Answer: A
Correct answer: the dead state in equilibrium with the surroundings
Exergy is the maximum useful work obtainable as a stream is brought to equilibrium with its environment, so it is measured against that environment - the dead state, at the pressure and temperature of the surroundings. A stream at ambient conditions has no exergy however much energy it contains, which is exactly the distinction between the two quantities.
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