Exergy
Exergy
Exergy (/ˈɛksɜːrdʒi/), also known as available work or availability, is a term used in thermodynamics to describe the maximum useful work that can be extracted from a system at a given state in a specified environment.
Etymology
The term "exergy" was coined by Zoran Rant in 1956, derived from the Greek words "ex" (out of) and "ergon" (work), signifying that exergy is the energy that is available to be used.
Definition
Exergy is the measure of a system's energy that can be converted into work, taking into account both the system and its environment. It is calculated as the difference between the initial and final state of a system following a reversible process. The concept of exergy is particularly useful in the analysis of energy conversion processes, such as in power plants and refrigeration systems.
Related Terms
- Energy: The capacity of a physical system to perform work. Energy exists in several forms such as heat, kinetic or mechanical energy, light, potential energy, and electrical energy.
- Thermodynamics: The branch of physics that deals with the relationships between heat and other forms of energy.
- Entropy: A measure of the amount of energy in a physical system that cannot be used to do work.
- Work (physics): In physics, work is the energy transferred to or from an object via the application of force along a displacement.
See Also
External links
- Medical encyclopedia article on Exergy
- Wikipedia's article - Exergy
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