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1、EnergyConversionandManagement78(2014)551–558ContentslistsavailableatScienceDirectEnergyConversionandManagementjournalhomepage:www.elsevier.com/locate/enconmanAsupercriticalortranscriticalRankinecyclewithejectorusinglow-gradeheatXinguoLi⇑,HaijunHuang,WenjingZhaoD
2、epartmentofThermalEngineering,SchoolofMechanicalEngineering,TianjinUniversity,Tianjin300072,PRChinaarticleinfoabstractArticlehistory:AsupercriticalortranscriticalRankinecyclewithejector(ESRC,ETRC)basedonthebasicsupercriticalorReceived20August2013transcriticalRan
3、kinecycle(SRC,TRC)areproposedfortheconversionoflow-gradeheattopowerinthisAccepted14November2013paper.ThethermodynamiccomparativeanalysesontheSRC,TRCandESRC,ETRCareconductedontheAvailableonline10December2013poweroutputandthermalefficiencyofthecycles.Thecarbondioxi
4、deischosenastheworkingfluidforthecycles.Waterischosenasthefluidofthelow-gradeheat.ThewatertemperatureisselectedinaKeywords:rangeof60–90°C,atypicalwatertemperatureis80°C,andthemassflowrateis1kg/s.Thesametem-SupercriticalortranscriticalRankinecycleperatureandmassflowr
5、ateofthewateristhestandardconditionforthecomparativeanalysisofthe(SRCTRC)thermodynamicperformance.ResultsshowthatthenetpoweroutputofthecyclescouldberankedfromSupercriticalortranscriticalRankinecyclewithejector(ESRCETRC)hightolow:ESRC>ETRC>SRC>TRC,andthethermalef
6、ficiencycouldberankedfromhightolow:EjectorTRC>SRC>ESRC>ETRC.ThermodynamicanalysisÓ2013ElsevierLtd.Allrightsreserved.1.IntroductioncyclehasabetterperformancethantheORC.Zhangetal.[6]pre-sentedthatR123insubcriticalORCsystemyieldsthehighestther-Thelow-gradeheat,sucha
7、ssolarenergy,geothermalenergy,malefficiencyandexergyefficiency,whilefortranscriticalORC,biomassenergy,andwasteheatfromvariousthermalprocesses,R125hasahigherthermalandexergyefficiencythanthatofexistsintheworldextensively.Especially,thelow-gradeheatwithR123inORC.Chen
8、etal.[7]studiedthetranscritcalRankinecycletemperaturerangeof60–100°CislargeramountandmoreeasilyusingR32andCO2.Theenergyandexergyanalysesshowedthatacquired.Theutilizat
