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Entropy 2015, 17(8), 5503-5521;

Optimization of the Changing Phase Fluid in a Carnot Type Engine for the Recovery of a Given Waste Heat Source

Laboratoire d'Énergétique et de Mécanique Théorique et Appliquée, UMR 7563, Université de Lorraine, 54518 Vandoeuvre-lès-Nancy, France
Agence de l'Environnement et de la Maîtrise de l'Energie (ADEME), 20, avenue du Grésillé-BP 90406, 49004 Angers Cedex 01, France
Author to whom correspondence should be addressed.
Academic Editor: Kevin H. Knuth
Received: 10 July 2015 / Revised: 24 July 2015 / Accepted: 27 July 2015 / Published: 31 July 2015
(This article belongs to the Special Issue Selected Papers from 13th Joint European Thermodynamics Conference)
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A Carnot type engine with a changing phase during the heating and the cooling is modeled with its thermal contact with the heat source. In a first optimization, the optimal high temperature of the cycle is determined to maximize the power output. The temperature and the mass flow rate of the heat source are given. This does not take into account the converter internal fluid and its mass flow rate. It is an exogenous optimization of the converter. In a second optimization, the endogenous optimization, the isothermal heating corresponds only to the vaporization of the selected fluid. The maximization of the power output gives the optimal vaporization temperature of the cycled fluid. Using these two optima allows connecting the temperature of the heat source to the working fluid used. For a given temperature level, mass flow rate and composition of the waste heat to recover, an optimal fluid and its temperature of vaporization are deduced. The optimal conditions size also the internal mass flow rate and the compression ratio (pump size). The optimum corresponds to the maximum of the power output and must be combined with the environmental fluid impact and the technological constraints. View Full-Text
Keywords: optimization; working fluid; Carnot engine; waste heat recovery optimization; working fluid; Carnot engine; waste heat recovery

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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. (CC BY 4.0).

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Blaise, M.; Feidt, M.; Maillet, D. Optimization of the Changing Phase Fluid in a Carnot Type Engine for the Recovery of a Given Waste Heat Source. Entropy 2015, 17, 5503-5521.

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