What is the relationship between exergy and Gibbs free energy?

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SUMMARY

The relationship between exergy and Gibbs free energy (ΔG) is defined by the equation exergy = -ΔG under conditions of constant pressure and temperature. Exergy represents the theoretical maximum work a system can perform as it approaches thermal equilibrium. The discussion clarifies that -ΔG quantifies the useful work obtainable from a system, reinforcing the importance of these thermodynamic concepts in understanding energy transformations.

PREREQUISITES
  • Understanding of thermodynamic principles
  • Familiarity with Gibbs free energy (ΔG)
  • Knowledge of exergy and its definition
  • Basic grasp of thermal equilibrium concepts
NEXT STEPS
  • Research the implications of constant pressure and temperature on Gibbs free energy
  • Explore the applications of exergy in engineering systems
  • Study the relationship between exergy and entropy
  • Investigate the role of exergy in sustainable energy systems
USEFUL FOR

Students and professionals in thermodynamics, energy engineers, and researchers focused on energy efficiency and sustainability will benefit from this discussion.

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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