Pitfalls of Exergy Analysis

@article{Vgner2016PitfallsOE,
  title={Pitfalls of Exergy Analysis},
  author={Petr V{\'a}gner and Michal Pavelka and Frantisek Mars{\'i}k},
  journal={Journal of Non-Equilibrium Thermodynamics},
  year={2016},
  volume={42},
  pages={201 - 216}
}
Abstract The well-known Gouy–Stodola theorem states that a device produces maximum useful power when working reversibly, that is with no entropy production inside the device. This statement then leads to a method of thermodynamic optimization based on entropy production minimization. Exergy destruction (difference between exergy of fuel and exhausts) is also given by entropy production inside the device. Therefore, assessing efficiency of a device by exergy analysis is also based on the Gouy… 

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References

SHOWING 1-10 OF 26 REFERENCES

Generalization of exergy analysis

Entropy generation minimization: The new thermodynamics of finite-size devices and finite-time processes

Entropy generation minimization (finite time thermodynamics, or thermodynamic optimization) is the method that combines into simple models the most basic concepts of heat transfer, fluid mechanics,

Detailed thermodynamic analysis of polymer electrolyte membrane fuel cell efficiency

Finite time generalization of thermal exergy

Endoreversible Thermodynamics

We are living in a world full of heat engines, refrigerators and other energy transformation devices. Even life can be regarded as special form of energy transformation. The understanding of these

Thermodynamic Optimization of a Monolithic-Type Solid Oxide Fuel Cell. 22nd International Conference on Efficiency, Cost, Optimization Simulation and Environmental Impact of Energy Systems

In the presented paper possible design modifications in tubular solid oxide fuel cell (SOFC) geometry are investigated in order to increase its performance. The analysis of entropy generation

Second-law design of a latent heat thermal energy storage with branched fins

TLDR
The best fins design leads to a twofold increase of the solidification rate in the latent heat storage system through an approach based on the analysis of entropy generation.