ASTM_C_1130_-_07_2012.pdf

Designation:C113007(Reapproved 2012)Standard Practice forCalibrating Thin Heat Flux Transducers1This standard is issued under the fixed designation C1130;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice,in conjunction with Test Method C177,C518,C1114,or C1363,establishes an experimental procedurefor determining the sensitivity of heat flux transducers that arerelatively thin.1.1.1 For the purpose of this standard,the thickness of theheat flux transducer shall be less than 30%of the narrowestplanar dimension of the heat flux transducer.1.2 This practice discusses a method for determining thesensitivity of a heat flux transducer to one-dimensional heatflow normal to the surface and for determining the sensitivityof a heat flux transducer for an installed application.1.3 This practice should be used in conjunction with Prac-tice C1046 when performing in-situ measurements of heat fluxon opaque building components.1.4 This practice is not intended to determine the sensitivityof heat flux transducers that are components of heat flow meterapparatus,as in Test Method C518.1.5 This practice is not intended to determine the sensitivityof heat flux transducers used for in-situ industrial applicationsthat are covered in Practice C1041.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C168 Terminology Relating to Thermal InsulationC177 Test Method for Steady-State Heat Flux Measure-ments and Thermal Transmission Properties by Means ofthe Guarded-Hot-Plate ApparatusC518 Test Method for Steady-State Thermal TransmissionProperties by Means of the Heat Flow Meter ApparatusC1041 Practice for In-Situ Measurements of Heat Flux inIndustrial Thermal Insulation Using Heat Flux Transduc-ersC1044 Practice for Using a Guarded-Hot-Plate Apparatus orThin-Heater Apparatus in the Single-Sided ModeC1046 Practice for In-Situ Measurement of Heat Flux andTemperature on Building Envelope ComponentsC1114 Test Method for Steady-State Thermal TransmissionProperties by Means of the Thin-Heater ApparatusC1155 Practice for Determining Thermal Resistance ofBuilding Envelope Components from the In-Situ DataC1363 Test Method for Thermal Performance of BuildingMaterials and Envelope Assemblies by Means of a HotBox Apparatus3.Terminology3.1 DefinitionsFor definitions of terms relating to thermalinsulating materials,see Terminology C168.3.2 Definitions of Terms Specific to This Standard:3.2.1 maskmaterial(or materials)having the same,ornearly the same,thermal properties and thickness surroundingthe heat flux transducer thereby promoting one-dimensionalheat flow through the heat flux transducer.3.2.2 sensitivitythe ratio of the electrical output of the heatflux transducer to the heat flux passing through the devicewhen measured under steady-state heat flow.3.2.3 test stacka layer or a series of layers of material puttogether to comprise a test sample(for example,a roof systemcontaining a membrane,an insulation,and a roof deck).3.3 Symbols:R=thermal resistance,m2K/W(hft2F/Btu)q=heat flux,W/m2(Btu hft2)Qexpected=heatfluxexpectedinapplication,W/m2(Btu hft2)E=measured output voltage,VS=sensitivity,V/(W/m2)(V(Btu hrft2)T=temperature difference,K(F)Rlayer=thermal resistance of a layer in the test stack,m2K/W(hft2F/Btu)T=temperature,K(F)uc=combined standard uncertainty1This practice is under the jurisdiction of ASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.30 on ThermalMeasurement.Current edition approved Sept.1,2012.Published November 2012.Originallyapproved in 1989.Last previous edition approved in 2007 as C1130 07.DOI:10.1520/C1130-07R12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 u1=standard uncertainty of the regression coefficientsu2=standard uncertainty for replicate measurementsu3=standard uncertainty for the measurement=error term4.Significance and Use4.1 The use of heat flux transducers on building envelopecomponents provides the user with a means for performingin-situ heat flux measurements.Accurate translation of the heatflux transducer output requires a complete understanding of thefactors affecting its output,and a standardized method fordetermining the heat flux transducer