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Open AccessArticle

Efficiency Bounds for Minimally Nonlinear Irreversible Heat Engines with Broken Time-Reversal Symmetry

1, 1, 1, 1 and 1,2,3,*
1
Department of Physics, Nanchang University, Nanchang 330031, China
2
State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
3
State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
*
Author to whom correspondence should be addressed.
Entropy 2019, 21(7), 717; https://doi.org/10.3390/e21070717
Received: 19 June 2019 / Revised: 12 July 2019 / Accepted: 17 July 2019 / Published: 23 July 2019
(This article belongs to the Special Issue Thermodynamic Approaches in Modern Engineering Systems)
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Abstract

We study the minimally nonlinear irreversible heat engines in which the time-reversal symmetry for the systems may be broken. The expressions for the power and the efficiency are derived, in which the effects of the nonlinear terms due to dissipations are included. We show that, as within the linear responses, the minimally nonlinear irreversible heat engines can enable attainment of Carnot efficiency at positive power. We also find that the Curzon-Ahlborn limit imposed on the efficiency at maximum power can be overcome if the time-reversal symmetry is broken. View Full-Text
Keywords: heat engine; nonlinear irreversible; broken time-reversal symmetry; efficiency at maximum power heat engine; nonlinear irreversible; broken time-reversal symmetry; efficiency at maximum power
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Liu, Q.; Li, W.; Zhang, M.; He, J.; Wang, J. Efficiency Bounds for Minimally Nonlinear Irreversible Heat Engines with Broken Time-Reversal Symmetry. Entropy 2019, 21, 717.

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