Entropy 2015, 17(11), 7331-7348; https://doi.org/10.3390/e17117331
Comparison Based on Exergetic Analyses of Two Hot Air Engines: A Gamma Type Stirling Engine and an Open Joule Cycle Ericsson Engine
1
LESTE, Ecole Nationale d’Ingénieurs de Monastir, Université de Monastir, Rue Ibn El Jazzar, Monastir 5019, Tunisia
2
LAMIH, CNRS UMR 8201, Université de Valenciennes et du Hainaut-Cambrésis, Le Mont Houy, 59313 Valenciennes cedex 9, France
*
Author to whom correspondence should be addressed.
Academic Editor: Kevin H. Knuth
Received: 9 July 2015 / Revised: 30 September 2015 / Accepted: 20 October 2015 / Published: 28 October 2015
(This article belongs to the Special Issue Entropy Generation in Thermal Systems and Processes 2015)
Abstract
In this paper, a comparison of exergetic models between two hot air engines (a Gamma type Stirling prototype having a maximum output mechanical power of 500 W and an Ericsson hot air engine with a maximum power of 300 W) is made. Referring to previous energetic analyses, exergetic models are set up in order to quantify the exergy destruction and efficiencies in each type of engine. The repartition of the exergy fluxes in each part of the two engines are determined and represented in Sankey diagrams, using dimensionless exergy fluxes. The results show a similar proportion in both engines of destroyed exergy compared to the exergy flux from the hot source. The compression cylinders generate the highest exergy destruction, whereas the expansion cylinders generate the lowest one. The regenerator of the Stirling engine increases the exergy resource at the inlet of the expansion cylinder, which might be also set up in the Ericsson engine, using a preheater between the exhaust air and the compressed air transferred to the hot heat exchanger. View Full-Text
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Hachem, H.; Creyx, M.; Gheith, R.; Delacourt, E.; Morin, C.; Aloui, F.; Nasrallah, S.B. Comparison Based on Exergetic Analyses of Two Hot Air Engines: A Gamma Type Stirling Engine and an Open Joule Cycle Ericsson Engine. Entropy 2015, 17, 7331-7348.