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Título
Energetic Self-Optimization Induced by Stability in Low-Dissipation Heat Engines
Autor(es)
Materia
Nonequilibrium and irreversible thermodynamics
Heat engines
Thermodynamics
Clasificación UNESCO
2210.32 Termodinámica
Fecha de publicación
2020-02
Resumen
[EN]The local stability of a weakly dissipative heat engine is analyzed and linked to an energetic multiobjective
optimization perspective. This constitutes a novel issue in the unified study of cyclic energy
converters, opening the perspective to the possibility that stability favors self-optimization of thermodynamic
quantities including efficiency, power and entropy generation. To this end, a dynamics simulating the
restitution forces, which mimics a harmonic potential, bringing the system back to the steady state is
analyzed. It is shown that relaxation trajectories are not arbitrary but driven by the improvement of several
energetic functions. Insights provided by the statistical behavior of consecutive random perturbations show
that the irreversible behavior works as an attractor for the energetics of the system, while the endoreversible
limit acts as an upper bound and the Pareto front as a global attractor. Fluctuations around the operation
regime reveal a difference between the behavior coming from fast and slow relaxation trajectories: while
the former are associated to an energetic self-optimization evolution, the latter are ascribed to better
performances. The self-optimization induced by stability and the possible use of instabilities in the
operation regime to improve the energetic performance might usher into new useful perspectives in the
control of variables for real engines.
URI
ISSN
0031-9007
DOI
10.1103/PhysRevLett.124.050603
Versión del editor
Colecciones
- GIOETFE. Artículos [48]