연료전지용 소형 금속 열교환기의 성능에 대한 실험 및 이론적 연구
Study on Experimental and Theroretical performances for a Compact Metallic Heat Exchanger for Fuel Cell Systems
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초록
Thisstudyassessedtheperformanceofacompactheatexchangerwithstaggeredtubebanksforrecuperation ofhightemperatureexhaustthermalenergyforSOFCfuelcellsystem.Thecompactheatexchangerinthisstudy istwopasssystem whichconsistsof315×202.5×48.5㎣ and132tubesof6.0㎜Φ foreachheatexchanger.From experimentsofthe2passheatexchangersystem,airtemperaturewasincreasedfrom 60~85℃ to402~482℃ while gas temperature was decreased from 600℃ to 305~402℃ according to mass flow rates of3.9~7.8 g/s.The experimentalheattransferratesoftheheatexchangerwerecomparedwithCFD numericalsolutionswiththe conventionalξ-NTU method.From the comparisons,the following conclusions were obtained.Forthe heat exchangersystem,therelativeerrorsofheattransferratebyCFD solutionwerefrom 7.1to27%,andthoseby ξ-NTU methodwerefrom 0.6% to21% comparedwithexperimentaldata.From thecomparisons,itcanbesaid thatbothofCFD andξ-NTU methodalmostsimulatedtoexperimentaldataexceptspecificconditions.Pressure dropsthrough airtubesand gaspassageswerecalculated with both oftheCFD computation and head loss equations.Thedifferencesbetweenthem werefrom 14to22%.
Abstract
Thisstudyassessedtheperformanceofacompactheatexchangerwithstaggeredtubebanksforrecuperation ofhightemperatureexhaustthermalenergyforSOFCfuelcellsystem.Thecompactheatexchangerinthisstudy istwopasssystem whichconsistsof315×202.5×48.5㎣ and132tubesof6.0㎜Φ foreachheatexchanger.From experimentsofthe2passheatexchangersystem,airtemperaturewasincreasedfrom 60~85℃ to402~482℃ while gas temperature was decreased from 600℃ to 305~402℃ according to mass flow rates of3.9~7.8 g/s.The experimentalheattransferratesoftheheatexchangerwerecomparedwithCFD numericalsolutionswiththe conventionalξ-NTU method.From the comparisons,the following conclusions were obtained.Forthe heat exchangersystem,therelativeerrorsofheattransferratebyCFD solutionwerefrom 7.1to27%,andthoseby ξ-NTU methodwerefrom 0.6% to21% comparedwithexperimentaldata.From thecomparisons,itcanbesaid thatbothofCFD andξ-NTU methodalmostsimulatedtoexperimentaldataexceptspecificconditions.Pressure dropsthrough airtubesand gaspassageswerecalculated with both oftheCFD computation and head loss equations.Thedifferencesbetweenthem werefrom 14to22%.
참고문헌 (8)
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