Designation:E3054/E3054M−16StandardGuideforCharacterizationandUseofHygrothermalModelsforMoistureControlDesigninBuildingEnvelopes1ThisstandardisissuedunderthefixeddesignationE3054/E3054M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguideoffersguidanceforthecharacterizationanduseofhygrothermalmodelsformoisturecontroldesignofbuildingenvelopes.Inthiscontext,“hygrothermalmodels”referstotheapplicationofamathematicalmodeltothesolutionofaspecificheatandmoistureflowperformanceissueorproblem.Hygrothermalmodelsareusedtopredictandevaluatedesignconsiderationsfortheshort-termandlong-termthermalandmoistureperformanceofbuildingenvelopes.1.2Eachhygrothermalmodelhasspecificcapabilitiesandlimitations.Determiningthemostappropriatehygrothermalmodelforaparticularapplicationrequiresathoroughanalysisoftheproblemathand,understandingtherequiredtransportprocessesinvolved,andavailableresourcestoconducttheanalysis.Usersofthisguidecandescribethefunctionalityofthehygrothermalmodelusedinananalysisinaconsistentmanner.1.3Thisguideappliestohygrothermalmodelsthatrangefromcomplexresearchtoolstosimpledesigntools.Thisguideprovidesaprotocolformatchingtheanalysisneedsandthecapabilitiesofcandidatemodels.1.4Thisguideappliestotheuseofmodelsthatincludeallorpartofthefollowingthermalandmoisturestorageandtransportphenomena:(1)heatstorageofdryandwetbuildingmaterials,(2)heattransportbymoisture-dependantthermalconduction,(3)phasechangephenomena(forexample,evapo-rationandcondensation),(4)heattransportbyairconvection,(5)moistureretentionbyvaporadsorptionandcapillaryforces,(6)moisturetransportbyvapordiffusion(molecularandeffusion),(7)moisturetransportbyliquidtransport(surfacediffusionandcapillaryflow),and(8)moisture(vapor)trans-portbyairconvection.1.5Thisguidedoesnotapplytocasesrequiringanal...
