Repository at Hanyang UniversityGRADUATE SCHOOL[S](대학원)MECHANICAL CONVERGENCE ENGINEERING(융합기계공학과)Theses (Ph.D.)
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| DC Field | Value | Language |
|---|---|---|
| dc.contributor.advisor | 김영범 | - |
| dc.contributor.author | 손종현 | - |
| dc.date.accessioned | 2024-03-01T07:31:55Z | - |
| dc.date.available | 2024-03-01T07:31:55Z | - |
| dc.date.issued | 2021.2 | - |
| dc.identifier.uri | http://hanyang.dcollection.net/common/orgView/200000485404 | en_US |
| dc.identifier.uri | https://repository.hanyang.ac.kr/handle/20.500.11754/188204 | - |
| dc.description.abstract | Fuelcellisoneofthepromisingenergyconversiondevicewhichgenerateselectricenergyfromchemicalenergyofhydrogen.Becauseitconvertschemicalenergyintoelectricenergydirectlywithelectrochemicalreactionofhydrogenandoxygen,itsenergyconversionefficiencyishigh.Besides,sinceitproducesonlywaterasby-products,itiseco-friendlyenergy.Polymerelectrolytefuelcell(PEFC)isatypeoffuelcellwhichuses polymermembraneaselectrolyte.Inadditiontogeneraladvantagesoffuelcell.ThePEFChasmanyadvantagessuchashighpowerdensity,faston-offtime,excellentdynamicresponseandwideapplicability.ThemanyadvantageshavedirectedalotofattentionsofresearchersandengineerstothePEFCandmanystudieshavebeenconductedbytheresearchersandengineerstoimprovethePEFCperformance. TheoneresearchstrategytoupgradethePEFCperformanceisimprovingmasstransfercharacteristics.Themasstransfermeansreactantsupplyandproductdischarge.ThePEFCperformanceisaffectedbytheconcentrationofreactantatreactionsiteandthereactantconcentrationisdeterminedbymasstransfercharacteristics.VaporthatistheproductofPEFCcondensesintoliquidwaterwhenthepartialpressureexceedsthesaturationpressure.BecausetheliquidwaterdegradesthePEFCperformancebyhinderingreactantsupplyandcoveringreactionsite,itisimportanttodischargetheproducteffectivelyandthisproduct dischargeisaffectedbymasstransfercharacteristics.Inthisdissertation,fivestudiesthatimprovedmasstransfercharacteristicsbymodifyingflowfieldincludinggasdiffusionlayer(GDL)andchannelwereconducted. Firstly,theGDLpropertiesandchanneltypesweretreatedassubjectforstudy.ByapplyingthevariousvaluesofGDLpropertytoserpentine,parallelandinterdigitatedchannelwhicharecalledasconventionalchanneltype,itwasconfirmedthattheeffectofGDLpropertyonthePEFCperformancechanged.GDLpermeabilityandGDLshapewhicharethepropertiesofGDLitselfwereselectedandstackingpressure,whichisexternalconditioncausingGDLdeformationandGDLpropertychange,wasalsoselectedastheGDLpropertiesforanalysis.TheGDLpermeabilityofperpendiculardirectionofmainflowwasdominantpermeabilitywhichremarkablyinfluencesthePEFCperformanceatserpentinechannel.However,thePEFCperformancehavingotherchanneltypehardlychangedbyGDLpermeabilityvariation.TheGDLshapewhichhassameshapetorib upgradedtheperformanceofallPEFCshavingdifferentchanneltypesbyimprovingmasstransfercharacterization.Finally,itwasconfirmedthattheoptimalstackingpressurewasdifferentdependingonthechanneltypeandcellvoltagecondition. Then,parallelchannelwithvariousbafflepatternandmetalfoamflowfieldwithserpentinestructureforevenreactantdistribution,whichareunconventionalchanneltype,werestudied.ThePEFChavingparallelchannelwasimprovedbyapplyingbafflesandthedegreeofimprovementwaschangedbybafflepattern.Whenthebafflesareappliedasstaggeredpatternwithwidespacingbetweenthebaffles,theparallelchannelPEFCshowedhighestcurrentdensity.Metalfoamflowfieldhavingserpentinestructureasflowguideshowedbetterperformancethanmetalfoamflowfieldwithoutserpentinestructureandwhenthenumberofturnsofserpentinestructureincreases,thePEFCperformanceincreasedwithpressuredrop. ThestudiesinthisdissertationdemonstratedthattheeffectofGDLpropertieschangebychanneltypeandsuggestedthesignificantparametersinunconventionalchanneltypeandtheeffectofparameters.Throughthestudies,itisexpectedthattheguide,whichhelpstheresearchersselectoptimalGDLpropertyandchanneltypewassuggestedandtheunderstandingofvariousparametersimprovingPEFCperformancewasbroadened.Accordingly,theworkcontributestowardcommercializationofPEFCbypresentingtheeffectivewayofhighperformancePEFCdesignandimprovingPEFCperformancehavingunconventionalchannel. | - |
| dc.publisher | 한양대학교 | - |
| dc.title | Computationaldesigntoimprovepolymerelectrolytefuelcellperformancebyflowfieldmodification | - |
| dc.type | Theses | - |
| dc.contributor.googleauthor | JonghyunSon | - |
| dc.contributor.alternativeauthor | 손종현 | - |
| dc.sector.campus | S | - |
| dc.sector.daehak | 대학원 | - |
| dc.sector.department | 융합기계공학과 | - |
| dc.description.degree | Doctor | - |
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