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Unintendedair owshavebeenrecognisedasadecisivefactorwhenfocusingonmoisturedamages and durabilityinbuildingcomponents(Hens2017).Althougheortshavebeenundertakentobetter quantifyconvectivemoisturetransport(Nusser,Bednar,andTeibinger2010;Kunzel,Zirkelbach,and Schafaczek2010),IEAAnnex41closedwithacriticaloutlookonthe"deeperexploration"ofe.g. integratingair owmodels(EBC2013).Referringtothisnote,thispaperpresentsaninitialapproach howtosimulateair owsinconstructionsalong3Dpaths-tothedierenceof owsinporousmedia - suchasingapsanditsimplementationinhygrothermalsimulation. An introductoryoverviewoftheestablishedwaystomodelair owsinhygrothermalsimulationtools and currentdevelopmentsinthiseldaregiven.Takingintoaccount3Dair owsinthejointsof the insulationasinviscidincompressibleair owsprovedtobeapossibilitytomatchmeasurement data withtheresultsofacoupledheat,airandmoisture(HAM)simulation.Inthisapproach, space availabletoair owwasmodelledaspermeablecells.Aleakageinducingatimedependant pressure dierencewasmodelledasamass owsources.Thedatausedforcomparisonconsistsofan experimentwheretheeectofleakageswhenexposedtopressuredierenceshasbeeninvestigated. The comparisonoftheresultsshowthatwiththisapproachthebehaviouroftheconstructionto the pressuredierencescouldbequalitativelyrecreated.Therenementofthephysicalmodeland the experimentalinvestigationofthehygrothermalpropertiesofthegapsandjointsareidentiedas future researchtopics.

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Published: 2022 Number of Pages: 10 Units of Measure: Dual Product Code(s): DBldgsXV-C027