Comparative second-law analysis of internal combustion enginge operation for methane, methanol, and dodecane fuels

Rakopoulos, CD; Kyritsis, DC

dc.contributor.author	Rakopoulos, CD	en
dc.contributor.author	Kyritsis, DC	en
dc.date.accessioned	2014-03-01T01:16:14Z
dc.date.available	2014-03-01T01:16:14Z
dc.date.issued	2001	en
dc.identifier.issn	0360-5442	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13989
dc.subject	Chemical Equilibrium	en
dc.subject	Entropy Generation	en
dc.subject	Entropy Production	en
dc.subject	High Speed	en
dc.subject	Internal Combustion Engine	en
dc.subject	Methane	en
dc.subject	Reaction Rate	en
dc.subject	Second Law	en
dc.subject.classification	Thermodynamics	en
dc.subject.classification	Energy & Fuels	en
dc.subject.other	Combustion	en
dc.subject.other	Entropy	en
dc.subject.other	Fuels	en
dc.subject.other	Methane	en
dc.subject.other	Methanol	en
dc.subject.other	Paraffins	en
dc.subject.other	Dodecane	en
dc.subject.other	Second law analysis	en
dc.subject.other	Internal combustion engines	en
dc.subject.other	internal combustion engine	en
dc.title	Comparative second-law analysis of internal combustion enginge operation for methane, methanol, and dodecane fuels	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0360-5442(01)00027-5	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0360-5442(01)00027-5	en
heal.language	English	en
heal.publicationDate	2001	en
heal.abstract	A method for both combustion irreversibility and working medium availability computations in a highspeed, naturally-aspirated, four-stroke, internal combustion engine cylinder is presented. The results of the second-law analysis of engine operation with n-dodecane (n-C12H26) fuel are compared with the results of a similar analysis for cases where a light, gaseous (CH4) and an oxygenated (CH3OH) fuel is used. The rate of entropy production during combustion is analytically calculated as a function of the fuel reaction rate with the combined use of first- and second-law arguments and a chemical equilibrium hypothesis. It is shown theoretically that the decomposition of lighter molecules leads to less entropy generation compared to heavier fuels. This is verified computationally for the particular fuels and the corresponding decrease in combustion irreversibility is calculated. Special reference is made to the effect of the lower mixing entropy of the exhaust gas of an oxygenated fuel (CH3OH) as a contribution to the discussion of the advantages and disadvantages of the use of such fuels. (C) 2001 Elsevier Science Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Energy	en
dc.identifier.doi	10.1016/S0360-5442(01)00027-5	en
dc.identifier.isi	ISI:000169881700005	en
dc.identifier.volume	26	en
dc.identifier.issue	7	en
dc.identifier.spage	705	en
dc.identifier.epage	722	en