Exergy analysis of micro-organic Rankine power cycles for a small scale solar driven reverse osmosis desalination system

dc.contributor.author	Tchanche, BF	en
dc.contributor.author	Lambrinos, Gr	en
dc.contributor.author	Frangoudakis, A	en
dc.contributor.author	Papadakis, G	en
dc.date.accessioned	2014-06-06T06:50:48Z
dc.date.available	2014-06-06T06:50:48Z
dc.date.issued	2010	en
dc.identifier.issn	03062619	en
dc.identifier.uri	http://dx.doi.org/10.1016/j.apenergy.2009.07.011	en
dc.identifier.uri	http://62.217.125.90/xmlui/handle/123456789/5169
dc.subject	Desalination	en
dc.subject	Exergy analysis	en
dc.subject	Organic Rankine engines	en
dc.subject.other	Critical component	en
dc.subject.other	Dry fluids	en
dc.subject.other	Energy analysis	en
dc.subject.other	Exergetic efficiency	en
dc.subject.other	Exergy Analysis	en
dc.subject.other	Exergy destructions	en
dc.subject.other	Exergy flow	en
dc.subject.other	Exergy loss	en
dc.subject.other	Heat sources	en
dc.subject.other	Mathematical graph	en
dc.subject.other	Mixing units	en
dc.subject.other	Organic Rankine engines	en
dc.subject.other	Performance assessment	en
dc.subject.other	Point temperature	en
dc.subject.other	Positive effects	en
dc.subject.other	Power cycle	en
dc.subject.other	Power systems	en
dc.subject.other	Rankine	en
dc.subject.other	Regenerative effects	en
dc.subject.other	Regenerative heat exchanger	en
dc.subject.other	Reverse osmosis desalination	en
dc.subject.other	Small scale	en
dc.subject.other	Thermodynamic perfection	en
dc.subject.other	Topological methods	en
dc.subject.other	Working fluid	en
dc.subject.other	Desalination	en
dc.subject.other	Energy conversion	en
dc.subject.other	Energy efficiency	en
dc.subject.other	Evaporators	en
dc.subject.other	Exergy	en
dc.subject.other	Fluids	en
dc.subject.other	Geothermal energy	en
dc.subject.other	Graphic methods	en
dc.subject.other	Profitability	en
dc.subject.other	Regenerators	en
dc.subject.other	Reverse osmosis	en
dc.subject.other	Thermodynamics	en
dc.subject.other	Turbines	en
dc.subject.other	Water filtration	en
dc.subject.other	Heat engines	en
dc.subject.other	desalination	en
dc.subject.other	energy efficiency	en
dc.subject.other	energy flow	en
dc.subject.other	engine	en
dc.subject.other	exergy	en
dc.subject.other	osmosis	en
dc.subject.other	performance assessment	en
dc.subject.other	thermodynamics	en
dc.subject.other	turbine	en
dc.title	Exergy analysis of micro-organic Rankine power cycles for a small scale solar driven reverse osmosis desalination system	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.apenergy.2009.07.011	en
heal.publicationDate	2010	en
heal.abstract	Exergy analysis of micro-organic Rankine heat engines is performed to identify the most suitable engine for driving a small scale reverse osmosis desalination system. Three modified engines derived from simple Rankine engine using regeneration (incorporation of regenerator or feedliquid heaters) are analyzed through a novel approach, called exergy-topological method based on the combination of exergy flow graphs, exergy loss graphs, and thermoeconomic graphs. For the investigations, three working fluids are considered: R134a, R245fa and R600. The incorporated devices produce different results with different fluids. Exergy destruction throughout the systems operating with R134a was quantified and illustrated using exergy diagrams. The sites with greater exergy destruction include turbine, evaporator and feedliquid heaters. The most critical components include evaporator, turbine and mixing units. A regenerative heat exchanger has positive effects only when the engine operates with dry fluids; feedliquid heaters improve the degree of thermodynamic perfection of the system but lead to loss in exergetic efficiency. Although, different modifications produce better energy conversion and less exergy destroyed, the improvements are not significant enough and subsequent modifications of the simple Rankine engine cannot be considered as economically profitable for heat source temperature below 100 °C. As illustration, a regenerator increases the system's energy efficiency by 7%, the degree of thermodynamic perfection by 3.5% while the exergetic efficiency is unchanged in comparison with the simple Rankine cycle, with R600 as working fluid. The impacts of heat source temperature and pinch point temperature difference on engine's performance are also examined. Finally, results demonstrate that energy analysis combined with the mathematical graph theory is a powerful tool in performance assessments of Rankine based power systems and permits meaningful comparison of different regenerative effects based on their contribution to systems improvements. © 2009 Elsevier Ltd. All rights reserved.	en
heal.journalName	Applied Energy	en
dc.identifier.issue	4	en
dc.identifier.volume	87	en
dc.identifier.doi	10.1016/j.apenergy.2009.07.011	en
dc.identifier.spage	1295	en
dc.identifier.epage	1306	en