Availability accumulation and destruction in a DI diesel engine with special reference to the limited cooled case

Rakopoulos, CD; Andritsakis, EC; Kyritsis, DK

dc.contributor.author	Rakopoulos, CD	en
dc.contributor.author	Andritsakis, EC	en
dc.contributor.author	Kyritsis, DK	en
dc.date.accessioned	2014-03-01T01:09:19Z
dc.date.available	2014-03-01T01:09:19Z
dc.date.issued	1993	en
dc.identifier.issn	0890-4332	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/10895
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0027591224&partnerID=40&md5=fb1032c22a6b14c700045bb59856cc3e	en
dc.subject.classification	Thermodynamics	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.classification	Mechanics	en
dc.subject.other	Combustion	en
dc.subject.other	Heat transfer	en
dc.subject.other	Mathematical models	en
dc.subject.other	Thermodynamics	en
dc.subject.other	Waste heat utilization	en
dc.subject.other	Combustion irreversibility production rate	en
dc.subject.other	Engine heat transfer reduction	en
dc.subject.other	Fuel reaction rates	en
dc.subject.other	Diesel engines	en
dc.title	Availability accumulation and destruction in a DI diesel engine with special reference to the limited cooled case	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1993	en
heal.abstract	This work develops a method for the calculation of both the irreversibility produced during combustion and the working medium availability at the end of the expansion process in a high speed, direct injection (DI), naturally aspirated, four-stroke diesel engine, on which experiments were conducted at the authors' laboratory. The experimental data were processed for the determination of fuel reaction rates; the combustion irreversibility production rate was then computed from the fuel reaction rates via an analytical mathematical expression which was developed by the present research group, based on the combined resolution of the first and second laws of thermodynamics. This expression is coupled with standard first law calculations and then is integrated to give the accumulated combustion irreversibility, while the working medium availability variation is also computed throughout the engine closed cycle. These calculations are applied for a wide range of measured loads, injection timings and engine rotational speeds; they are also expanded in the direction of the intensity of the rate of heat transfer loss (to the engine cooling medium) for every combination of the experimentally determined engine variables. Therefore, apart from investigating the effect of various operating parameters on the availability balance, it is possible to evaluate the effect of the engine heat transfer reduction (limited cooled engine), from the second law analysis point of view, on the potential for efficiency improvements made by using the increased exhaust heat in recovery devices (e.g. the exhaust turbine or Rankine bottoming cycle compounding). With the present second law analysis, which forms the spearhead of this work, the exhaust gas availability offers more useful information than its enthalpy counterpart (first law analysis) for the operation of such compounding devices. The irreversibility calculation also provides useful information for the combustion loss, which cannot be isolated and evaluated at all by a first law analysis. © 1993.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Heat Recovery Systems and CHP	en
dc.identifier.isi	ISI:A1993LE17800007	en
dc.identifier.volume	13	en
dc.identifier.issue	3	en
dc.identifier.spage	261	en
dc.identifier.epage	276	en