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Entropy 2018, 20(11), 865;

Optimization and Stability of Heat Engines: The Role of Entropy Evolution

Departamento de Física Aplicada, Universidad de Salamanca, 37008 Salamanca, Spain
Instituto de Física Fundamental y Matemáticas, Universidad de Salamanca, 37008 Salamanca, Spain
Centro de Investigación y Estudios Avanzados del IPN Unidad Monterrey, Apodaca, NL 66600, Mexico
Author to whom correspondence should be addressed.
Received: 23 October 2018 / Revised: 5 November 2018 / Accepted: 7 November 2018 / Published: 9 November 2018
(This article belongs to the Special Issue Entropy Generation and Heat Transfer)
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Local stability of maximum power and maximum compromise (Omega) operation regimes dynamic evolution for a low-dissipation heat engine is analyzed. The thermodynamic behavior of trajectories to the stationary state, after perturbing the operation regime, display a trade-off between stability, entropy production, efficiency and power output. This allows considering stability and optimization as connected pieces of a single phenomenon. Trajectories inside the basin of attraction display the smallest entropy drops. Additionally, it was found that time constraints, related with irreversible and endoreversible behaviors, influence the thermodynamic evolution of relaxation trajectories. The behavior of the evolution in terms of the symmetries of the model and the applied thermal gradients was analyzed. View Full-Text
Keywords: heat engine; local stability; maximum power regime; maximum Omega regime; entropy production heat engine; local stability; maximum power regime; maximum Omega regime; entropy production

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Gonzalez-Ayala, J.; Santillán, M.; Santos, M.J.; Calvo Hernández, A.; Mateos Roco, J.M. Optimization and Stability of Heat Engines: The Role of Entropy Evolution. Entropy 2018, 20, 865.

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