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Entropy 2010, 12(12), 2470-2484; doi:10.3390/e12122470
Article

Reconsideration of Criteria and Modeling in Order to Optimize the Efficiency of Irreversible Thermomechanical Heat Engines

Laboratoire d’Energetique et de Mecanique Theorique et Appliquee (LEMTA-ENSEM), Avenue de la Foret de Haye 54516, Vandoeuvre 2, France
Received: 29 October 2010 / Revised: 13 December 2010 / Accepted: 16 December 2010 / Published: 21 December 2010
(This article belongs to the Special Issue Advances in Thermodynamics)
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Abstract

The purpose of this work is to precise and complete one recently proposed in the literature and relative to a general criterion to maximize the first law efficiency of irreversible heat engines. It is shown that the previous proposal seems to be a particular case. A new proposal has been developed for a Carnot irreversible thermomechanical heat engine at steady state associated to two infinite heat reservoirs (hot source, and cold sink): this constitutes the studied system. The presence of heat leak is accounted for, with the most simple form, as is done generally in the literature. Irreversibility is modeled through , created internal entropy rate in the converter (engine), and , total created entropy rate in the system. Heat transfer laws are represented as general functions of temperatures. These concepts are particularized to the most common heat transfer law (linear one). Consequences of the proposal are examined; some new analytical results are proposed for efficiencies.
Keywords: model; optimization; efficiency; irreversible thermomechanical heat engines; steady sate model; optimization; efficiency; irreversible thermomechanical heat engines; steady sate
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Feidt, M. Reconsideration of Criteria and Modeling in Order to Optimize the Efficiency of Irreversible Thermomechanical Heat Engines. Entropy 2010, 12, 2470-2484.

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