Cylinder wall insulation effects on the first- and second-law balances of a turbocharged diesel engine operating under transient load conditions

Giakoumis, EG

dc.contributor.author	Giakoumis, EG	en
dc.date.accessioned	2014-03-01T01:26:04Z
dc.date.available	2014-03-01T01:26:04Z
dc.date.issued	2007	en
dc.identifier.issn	0196-8904	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17912
dc.subject	turbocharged diesel engine	en
dc.subject	transient operation	en
dc.subject	second-law	en
dc.subject	exergy	en
dc.subject	irreversibilities	en
dc.subject	insulation	en
dc.subject.classification	Thermodynamics	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Mechanics	en
dc.subject.classification	Physics, Nuclear	en
dc.subject.other	INTERNAL-COMBUSTION ENGINES	en
dc.subject.other	HEAT-TRANSFER	en
dc.subject.other	DESTRUCTION	en
dc.title	Cylinder wall insulation effects on the first- and second-law balances of a turbocharged diesel engine operating under transient load conditions	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.enconman.2007.07.013	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.enconman.2007.07.013	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	During the last decades there has been an increasing interest in the low heat rejection (LHR) diesel engine. In an LHR engine, an increased level of temperatures inside the cylinder is achieved, resulting from the insulation applied to the walls. The steady-state, LHR engine operation has been studied so far by applying either first- or second-law balances. Only a few works, however, have treated this subject during the very important transient operation with the results limited to the engine speed response. To this aim an experimentally validated transient diesel engine simulation code has been expanded so as to include the second-law balance. Two common insulators for the engine in hand, i.e. silicon nitride and plasma spray zirconia are studied and their effect is compared to the nominal non-insulated operation from the first- and second-law perspective. It is revealed that after a step increase in load, the second-law values unlike the first-law ones are heavily impacted by the insulation scheme applied. Combustion and total engine irreversibilities decrease significantly (up to 23% for the cases examined) with increasing insulation. Unfortunately, this decrease is not transformed into an increase in the mechanical work but rather increases the potential for extra work recovery owing to the higher availability content of the exhaust gas. (C) 2007 Elsevier Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	ENERGY CONVERSION AND MANAGEMENT	en
dc.identifier.doi	10.1016/j.enconman.2007.07.013	en
dc.identifier.isi	ISI:000250910500021	en
dc.identifier.volume	48	en
dc.identifier.issue	11	en
dc.identifier.spage	2925	en
dc.identifier.epage	2933	en