CHEN 3101 Chapter Notes - Chapter 7: Thermoeconomics, Energy Accounting, Mechanical Equilibrium
Document Summary
Exergy (symbol: e): the property that quantifies potential for use: can be transferred to and from systems, can be destroyed by irreversibilities. When exergy is transferred from a system to its surrounding, there is a loss. Heat transfer to and from a system can be used to do work until equilibrium is reached. (it"s at dead state) Exergy is the max. theoretical value of such work. The environment surrounding such a system is the exergy reference environment, or just the environment. In this book, the environment is considered large and have uniform temperature (to) and pressure (po: normally: to = 25 c/ 77 f, po = 1 atm. Definition of exergy: exergy is the maximum theoretical work obtainable from an overall system consisting of a system and the environment as the system comes into equilibrium with the environment (passes to the dead state). *unit for exergy is the same as energy.
