C027 — Hygrothermal Simulation—Modelling Airflow along Gap-like 3D Paths in Building Components with Darcy’s Law
- Comments Off on C027 — Hygrothermal Simulation—Modelling Airflow along Gap-like 3D Paths in Building Components with Darcy’s Law
- ASHRAE
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Unintendedair owshavebeenrecognisedasadecisivefactorwhenfocusingonmoisturedamages and durabilityinbuildingcomponents(Hens2017).Althoughe ortshavebeenundertakentobetter quantifyconvectivemoisturetransport(Nusser,Bednar,andTeibinger2010;Kunzel,Zirkelbach,and Schafaczek2010),IEAAnnex41closedwithacriticaloutlookonthe”deeperexploration”ofe.g. integratingair owmodels(EBC2013).Referringtothisnote,thispaperpresentsaninitialapproach howtosimulateair owsinconstructionsalong3Dpaths-tothedi erenceof owsinporousmedia – suchasingapsanditsimplementationinhygrothermalsimulation. An introductoryoverviewoftheestablishedwaystomodelair owsinhygrothermalsimulationtools and currentdevelopmentsinthis eldaregiven.Takingintoaccount3Dair owsinthejointsof the insulationasinviscidincompressibleair owsprovedtobeapossibilitytomatchmeasurement data withtheresultsofacoupledheat,airandmoisture(HAM)simulation.Inthisapproach, space availabletoair owwasmodelledaspermeablecells.Aleakageinducingatimedependant pressure di erencewasmodelledasamass owsources.Thedatausedforcomparisonconsistsofan experimentwherethee ectofleakageswhenexposedtopressuredi erenceshasbeeninvestigated. The comparisonoftheresultsshowthatwiththisapproachthebehaviouroftheconstructionto the pressuredi erencescouldbequalitativelyrecreated.There nementofthephysicalmodeland the experimentalinvestigationofthehygrothermalpropertiesofthegapsandjointsareidenti edas future researchtopics.
Product Details
- Published:
- 2022
- Number of Pages:
- 10
- Units of Measure:
- Dual
- Product Code(s):
- DBldgsXV-C027
