Designation:D5157−97(Reapproved2014)StandardGuideforStatisticalEvaluationofIndoorAirQualityModels1ThisstandardisissuedunderthefixeddesignationD5157;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguideprovidesquantitativeandqualitativetoolsforevaluationofindoorairquality(IAQ)models.Thesetoolsincludemethodsforassessingoverallmodelperformanceaswellasidentifyingspecificareasofdeficiency.Guidanceisalsoprovidedinchoosingdatasetsformodelevaluationandinapplyingandinterpretingtheevaluationtools.Thefocusoftheguideisonendresults(thatis,theaccuracyofindoorconcentrationspredictedbyamodel),ratherthanoperationaldetailssuchastheeaseofmodelimplementationorthetimerequiredformodelcalculationstobeperformed.1.2AlthoughIAQmodelshavebeenusedforsometime,thereislittleguidanceinthetechnicalliteratureontheevaluationofsuchmodels.Evaluationprinciplesandtoolsinthisguidearedrawnfrompasteffortsrelatedtooutdoorairqualityormeteorologicalmodels,whichhaveobjectivessimi-lartothoseforIAQmodelsandahistoryofevaluationliterature.(1)2SomelimitedexperienceexistsintheuseofthesetoolsforevaluationofIAQmodels.2.ReferencedDocuments2.1ASTMStandards:3D1356TerminologyRelatingtoSamplingandAnalysisofAtmospheres3.Terminology3.1Definitions:Fordefinitionsoftermsusedinthisstandard,refertoTerminologyD1356.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1IAQmodel,n—anequation,algorithm,orseriesofequations/algorithmsusedtocalculateaverageortime-varyingpollutantconcentrationsinoneormoreindoorchambersforaspecificsituation.3.2.2modelbias,n—asystematicdifferencebetweenmodelpredictionsandmeasuredindoorconcentrations(forexample,themodelpredictionisgenerallyhigherthanthemeasuredconcentrationforaspecificsituation).3.2.3modelchamber,n—anindoorairspaceofdefinedvolumeusedinmodelcalculations;IAQmodelscanbespec...
