Designation:E2684−09StandardTestMethodforMeasuringHeatFluxUsingSurface-MountedOne-DimensionalFlatGages1ThisstandardisissuedunderthefixeddesignationE2684;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddescribesthemeasurementofthenetheatfluxnormaltoasurfaceusingflatgagesmountedontothesurface.Conductionheatfluxisnotthefocusofthisstandard.ConductionapplicationsrelatedtoinsulationmaterialsarecoveredbyTestMethodC518andPracticesC1041andC1046.ThesensorscoveredbythistestmethodalluseameasurementofthetemperaturedifferencebetweentwoparallelplanesnormaltothesurfacetodeterminetheheatthatisexchangedtoorfromthesurfaceinkeepingwithFourier’sLaw.Thegagesoperatebythesameprinciplesforheattransferineitherdirection.1.2Thistestmethodisquitebroadinitsfieldofapplication,sizeandconstruction.Differentsensortypesaredescribedindetailinlatersectionsasexamplesofthegeneralmethodformeasuringheatfluxfromthetemperaturegradientnormaltoasurface(1).2Applicationsincludebothradiationandconvec-tionheattransfer.Thegageshavebroadapplicationfromaerospacetobiomedicalengineeringwithmeasurementsrang-ingform0.01to50kW/m2.Thegagesareusuallysquareorrectangularandvaryinsizefrom1mmto10cmormoreonaside.Thethicknessesrangefrom0.05to3mm.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesstatedinparenthesesareprovidedforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:C518TestMethodforSteady-StateThermalTransmissionPropertiesbyMeansoftheHeatFlowMeterApparatusC1041PracticeforIn-SituMeasurementsofHeatFluxinIndustrialThermalInsulationU...
