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Exergy Analysis of Complex Ship Energy Systems

Service Department, Marine & Offshore Division, Bureau Veritas, Saint-Herblain 44807, France
Laboratoire de recherche en Hydrodynamique, Énergétique et Environnement Atmosphérique (LHEEA), UMR 6598 CNRS, Ecole Centrale de Nantes, 44321 Nantes Cedex 3, France
Author to whom correspondence should be addressed.
Academic Editors: Morin Celine, Bernard Desmet, Fethi Aloui and Kevin H. Knuth
Entropy 2016, 18(4), 127;
Received: 12 October 2015 / Revised: 1 February 2016 / Accepted: 21 March 2016 / Published: 8 April 2016
(This article belongs to the Special Issue Entropy Generation in Thermal Systems and Processes 2015)
PDF [1756 KB, uploaded 8 April 2016]


With multiple primary and secondary energy converters (diesel engines, steam turbines, waste heat recovery (WHR) and oil-fired boilers, etc.) and extensive energy networks (steam, cooling water, exhaust gases, etc.), ships may be considered as complex energy systems. Understanding and optimizing such systems requires advanced holistic energy modeling. This modeling can be done in two ways: The simpler approach focuses on energy flows, and has already been tested, approved and presented; a new, more complicated approach, focusing on energy quality, i.e., exergy, is presented in this paper. Exergy analysis has rarely been applied to ships, and, as a general rule, the shipping industry is not familiar with this tool. This paper tries to fill this gap. We start by giving a short reminder of what exergy is and describe the principles of exergy modeling to explain what kind of results should be expected from such an analysis. We then apply these principles to the analysis of a large two-stroke diesel engine with its cooling and exhaust systems. Simulation results are then presented along with the exergy analysis. Finally, we propose solutions for energy and exergy saving which could be applied to marine engines and ships in general. View Full-Text
Keywords: exergy analysis; ships; diesel engines; holistic energy modeling; complex systems exergy analysis; ships; diesel engines; holistic energy modeling; complex systems

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Marty, P.; Hétet, J.-F.; Chalet, D.; Corrignan, P. Exergy Analysis of Complex Ship Energy Systems. Entropy 2016, 18, 127.

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