Integrated system approach for increase of engine combined cycle efficiency

Gewald, D; Karellas, S; Schuster, A; Spliethoff, H

dc.contributor.author	Gewald, D	en
dc.contributor.author	Karellas, S	en
dc.contributor.author	Schuster, A	en
dc.contributor.author	Spliethoff, H	en
dc.date.accessioned	2014-03-01T02:53:52Z
dc.date.available	2014-03-01T02:53:52Z
dc.date.issued	2012	en
dc.identifier.issn	01968904	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/36480
dc.subject	Internal combustion engine (ICEs)	en
dc.subject	Optimization	en
dc.subject	Waste heat recovery	en
dc.subject	Water/steam-cycle	en
dc.subject.other	Bottoming cycle	en
dc.subject.other	Calculation tools	en
dc.subject.other	Combined cycle	en
dc.subject.other	Combined-cycle efficiency	en
dc.subject.other	Electrical efficiency	en
dc.subject.other	Electricity generation	en
dc.subject.other	Engine cooling	en
dc.subject.other	Engine cooling systems	en
dc.subject.other	Gas parameters	en
dc.subject.other	Heat sources	en
dc.subject.other	Independent power producers	en
dc.subject.other	Integrated approach	en
dc.subject.other	Integrated systems	en
dc.subject.other	Optimal configurations	en
dc.subject.other	Optimization approach	en
dc.subject.other	Standard system	en
dc.subject.other	System efficiency	en
dc.subject.other	Technical limitations	en
dc.subject.other	Temperature level	en
dc.subject.other	Cooling systems	en
dc.subject.other	Cooling water	en
dc.subject.other	Economic analysis	en
dc.subject.other	Efficiency	en
dc.subject.other	Electric generators	en
dc.subject.other	Electric utilities	en
dc.subject.other	Integrated control	en
dc.subject.other	Internal combustion engines	en
dc.subject.other	Optimization	en
dc.subject.other	Thermoelectric equipment	en
dc.subject.other	Waste heat	en
dc.subject.other	Waste heat utilization	en
dc.subject.other	Engines	en
dc.title	Integrated system approach for increase of engine combined cycle efficiency	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1016/j.enconman.2011.10.029	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.enconman.2011.10.029	en
heal.publicationDate	2012	en
heal.abstract	Internal combustion engines (ICEs) are widely used as independent power producers due to their high electrical efficiency (up to 47%), which can be further enhanced by operating them in combined cycle mode with a water/steam cycle as bottoming cycle. This study presents an integrated approach to optimize the combined cycle overall system efficiency. Therefore, not only the most favorable design of the waste heat recovery (WHR) cycle, but also the optimal configuration of the ICE cooling system have to be investigated, in order to integrate both available engine waste heat sources (exhaust gas, 300-400 °C, engine cooling water, 90 °C) into the waste heat recovery cycle. For the definition of the most favourable temperature level of the engine cooling water three variants of engine cooling systems are examined, with respect to technical limitations given by the ICE. In order to determine the types of engines for which this optimization approach is suitable, three types of engines with different characteristics (fuel, exhaust gas parameters) combined with a water/steam cycle are simulated, by using the calculation tools Excel and Ebsilon Professional. An energetic, exergetic and economic analysis is conducted. These reveal the impacts of the temperature level to the WHR system and to the design of the engine cooling system. The calculations performed, showed that up to 19% of the engine cooling water heat can be efficiently recovered compared to a portion of 6% in the standard system. The better recovery leads to a 5%-decrease in the costs of electricity generation. © 2012 Elsevier Ltd. All rights reserved.	en
heal.journalName	Energy Conversion and Management	en
dc.identifier.doi	10.1016/j.enconman.2011.10.029	en
dc.identifier.volume	60	en
dc.identifier.spage	36	en
dc.identifier.epage	44	en