exergy

noun

Etymology: The term "exergy" was coined in 1956 by Zoran Rant (1904–1972) from Ancient Greek ἐξ (ex, “out of, away from”) + ἔργον (érgon, “work”).

1. Concentrated or organized energy, which can be exported and do work in the process.

   “The maximum fraction of an energy form which (in a reversible process) can be transformed into work is called exergy. The remaining part is called anergy, and this corresponds to the waste heat.”