Exergy Concept

The exergy of a system in a defined state is the maximum amount of theoretically useful work that can be obtained when the system interacts with its environment in order to go from the defined state to mutual thermodynamic equilibrium, with the heat interaction performed exclusive heat with the environment. This led to the development of its etymology. The word “exergy” comes from the Greek language. It is formed by combining the prefix ex-, which means “external” or “outwards,” with the segment ergon, which can represent either “force” or “work.” In other words, the definition of exergy is “force out” or “force that can be extracted.”