What is the relationship between exergy and Gibbs free energy?

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-ΔG represents the maximum useful work a system can perform under constant pressure and temperature conditions of the surroundings. Exergy is defined as the theoretical maximum work achievable by a system as it approaches thermal equilibrium. The relationship between exergy and -ΔG holds true specifically when both the system and surroundings maintain constant pressure and temperature. Understanding these concepts is crucial for analyzing thermodynamic processes. Clarifying these definitions enhances comprehension of energy efficiency in systems.
Nikitin
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Hi. I have two questions:

1) Is -ΔG the amount of useful work a system can do while the pressure and temperature of the surroundings are constant?

2) Is exergy = -ΔG only if the pressure and temperature of the system and surroundings is constant?

thanks
 
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What is exergy?
 
It's defined as the theoretical maximum work a system can do when moving towards thermal equilibrium.

I'm just unsure about the specifics behind its definition.

http://en.wikipedia.org/wiki/Exergy
 
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