Title of article
SimplifiedoptimumsizingandcostanalysisforcompactheatexchangerinVHTROriginalResearchArticle
Author/Authors
E.S.Kim، نويسنده , , C.H.Oh، نويسنده , , S.Sherman، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2008
Pages
13
From page
2635
To page
2647
Abstract
Inthisstudy,theoptimumsizeofthecompactheatexchangerhasbeendevelopedbasedonitsweightandpumpingpowerforthereferencedesignof600MWtveryhightemperaturegas-cooledreactor(VHTR)system.Alloy617wasselectedasaconstructionmaterial.TheoptimumsizeandanumberofconfigurationsforthereferencedesignoftheVHTRwithanintermediateheatexchanger(IHX)wereinvestigatedandourinitialcalculationsindicatedthatithasanunrealisticallytoolargeaspectratioofthelengthandheightduetoitssmall-sizedchannels,whichmightcausemanifoldingproblemsandalargenumberofparallelmoduleswithhighthermalstress.Theflowareaandchanneldiameterwerethenadjustedtoachieveasmalleraspectratiointhispaper.Achievementofthisaspectratioresultedinhighercost,butthecostincreasewaslessthanwouldhaveoccurredbysimplyreducingtheflowareabyitself.Theappropriatechanneldiameterisestimatedtobelessthan5.00mmforthereferencesystem.Theeffectofchannelwavinessenhancedthecompactnessandheattransferperformance,butunfavorablyincreasedtheaspectratio.Therefore,thewavinessshouldbecarefullydeterminedbasedonperformanceandeconomics.Inthisstudy,thewavinessoftheIHXisrecommendedtobeselectedbetween1.0and2.5.Calculationsshowthatreducingthedutydramaticallydecreasestheaspectratio,indicatingthatthecompactheatexchangeriseasytobeoptimallydesignedforlowduty,butmanymodulesarerequiredforhighdutyoperationproportionaltotheoperatingpower.Finally,theeffectofworkingfluidswasinvestigated,anditrevealsthatusingcarbondioxideinsteadofheliuminthesecondarysidereducesthesizeandcostbyabout20%duetothelowerpumpingpowerinspiteofitslowerheattransfercapabilitybyafactorof4.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2008
Journal title
Nuclear Engineering and Design Eslah
Record number
941508
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