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Entropy 2017, 19(4), 182;

Carnot-Like Heat Engines Versus Low-Dissipation Models

Departamento de Física Aplicada, Universidad de Salamanca, 37008 Salamanca, Spain
Instituto Universitario de Física Fundamental y Matemáticas (IUFFyM), Universidad de Salamanca, 37008 Salamanca, Spain
Authors to whom correspondence should be addressed.
Academic Editor: Michel Feidt
Received: 20 March 2017 / Revised: 18 April 2017 / Accepted: 20 April 2017 / Published: 23 April 2017
(This article belongs to the Special Issue Carnot Cycle and Heat Engine Fundamentals and Applications)
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In this paper, a comparison between two well-known finite time heat engine models is presented: the Carnot-like heat engine based on specific heat transfer laws between the cyclic system and the external heat baths and the Low-Dissipation model where irreversibilities are taken into account by explicit entropy generation laws. We analyze the mathematical relation between the natural variables of both models and from this the resulting thermodynamic implications. Among them, particular emphasis has been placed on the physical consistency between the heat leak and time evolution on the one side, and between parabolic and loop-like behaviors of the parametric power-efficiency plots. A detailed analysis for different heat transfer laws in the Carnot-like model in terms of the maximum power efficiencies given by the Low-Dissipation model is also presented. View Full-Text
Keywords: thermodynamics; optimization; entropy analysis thermodynamics; optimization; entropy analysis

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Gonzalez-Ayala, J.; Roco, J.M.M.; Medina, A.; Calvo Hernández, A. Carnot-Like Heat Engines Versus Low-Dissipation Models. Entropy 2017, 19, 182.

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