Exergy analysis and investigation for various feed water heaters of direct steam

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1、RenewableEnergy35(2010)1228–1235ContentslistsavailableatScienceDirectRenewableEnergyjournalhomepage:www.elsevier.com/locate/reneneExergyanalysisandinvestigationforvariousfeedwaterheatersofdirectsteamgenerationsolar–thermalpowerplanta,*bM.K.Gupta,S.C.KaushikaMechanicalEngineeringDepartment

2、,UjjainEngineeringCollege,Ujjain,M.P.456010,IndiabCentreforEnergyStudies,IndianInstituteofTechnology,Delhi,110016,IndiaarticleinfoabstractArticlehistory:TheenergyandexergyanalysishasbeencarriedoutforthedifferentcomponentsofaproposedReceived8April2009conceptualdirectsteamgeneration(DSG)sol

3、ar–thermalpowerplant(STPP).IthasbeenfoundthattheAccepted12September2009maximumenergylossisinthecondenserfollowedbysolarcollectorfield.ThemaximumexergylossisAvailableonline29October2009inthesolarcollectorfieldwhileinotherplantcomponentsitissmall.Thepossibilitiestofurtherimprovetheplantefficie

4、ncyareidentifiedandexploited.ForminimumexergylossinreceivertheinletKeywords:temperatureofwatertothereceiver,whichisgovernedbythenumberoffeedwaterheaters(FWHs),Energyandexergyanalysisbleedpressureandmassfractionofbleedsteam,mustbeoptimum.TheonlyoneFWHhasbeenSolar–thermalpowerplantproposedin

5、conceptualDSGSTPP.InordertoevaluatetheoptimumbleedpressureandmassfractionofFeedwaterheatersBleedpressurebleedsteamtomaximizetheSTPPefficiency,theinvestigationsarecarriedoutforvariousbleedpressureandmassfractionsofbleedsteamofproposedconceptualDSGSTPPhavingoneFWH.Theinvestigationsforbleedpr

6、essureandmassfractionofbleedsteamarealsocarriedoutbyincorporatingtwoandthreeFWHs.IthasbeenfoundthattherewillbesignificantimprovementinefficiencybyusingthreeFWHsandfurthergaininefficiencyispossiblebymakingprovisionformoreFWHs.Ó2009ElsevierLtd.Allrightsreserved.1.Introductionthermodynamicquali

7、tyofsolarradiationhasledtheresearcherstoexploretheefficientconversionofconcentratedsolarenergyintoEnergyconservationisakeygoalofeconomyanditwillelectricalenergybyusingthermodynamicpowercycles.Solar–continuetobeinnearfuture.Themosteffectivewaytomeetthethermalpowergene