ASTM_E_1423_-_14.pdf

Designation:E142314Standard Practice forDetermining Steady State Thermal Transmittance ofFenestration Systems1This standard is issued under the fixed designation E1423;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 covers standard test specimen sizes andtest conditions as well as the calculation and presentation of thethermal transmittance and conductance data measured in ac-cordance with Test Method C1199.The standard sizes andconditions are to be used for fenestration product comparisonpurposes.The specifier may choose other sizes and conditionsfor product development or research purposes.1.2 This practice deals with the determination of the thermalproperties of a fenestration system installed vertically withoutthe influences of solar heat gain and air leakage effects.NOTE1To determine air leakage effects of fenestration systems,TestMethod E283 or E1424 should be referenced.NOTE2See Appendix Appendix X1 regarding garage doors androlling doors.1.3 This practice specifies the procedure for determining thestandardized thermal transmittance of a fenestration test speci-men using specified values of the room-side and weather-sidesurface heat transfer coefficients,hhand hc,respectively.1.4 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.5 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 InsulationC1199 Test Method for Measuring the Steady-State ThermalTransmittance of Fenestration Systems Using Hot BoxMethodsC1363 Test Method for Thermal Performance of BuildingMaterials and Envelope Assemblies by Means of a HotBox ApparatusE283 Test Method for Determining Rate of Air LeakageThrough Exterior Windows,Curtain Walls,and DoorsUnder Specified Pressure Differences Across the Speci-menE631 Terminology of Building ConstructionsE783 Test Method for Field Measurement of Air LeakageThrough Installed Exterior Windows and DoorsE1424 Test Method for Determining the Rate ofAir LeakageThrough Exterior Windows,Curtain Walls,and DoorsUnder Specified Pressure and Temperature DifferencesAcross the Specimen2.2 Other Documents:ANSI/DASMA 105-19983NFRC 102-200243.Terminology3.1 DefinitionsDefinitions and terms are in accordancewith Terminology E631 and C168,from which the followinghave been selected and modified to apply specifically tofenestration systems.See Fig.1 and Fig.2 for variableidentification.(For further information on definitions andprocedures,see Appendix X2 or Test Method C1199.)3.1.1 surface heat transfer coeffcient,h(sometimes calledsurface conductance or film coeffcient)the time rate of heatflow from a unit area of a surface to its surroundings,inducedby a unit temperature difference between the surface and theenvironment.Subscripts are used to differentiate betweenroom-side(1orh)and weather-side(2orc)surface heat transfercoefficients(see Figs.1 and 2).3.1.2 thermal transmittance Us(sometimes called overallcoeffcient of heat transfer)the heat transfer in unit time1This guide is under the jurisdiction of ASTM Committee E06 on Performanceof Buildings and is the direct responsibility of Subcommittee E06.51 on Perfor-mance of Windows,Doors,Skylights and Curtain Walls.Current edition approved April 1,2014.Published May 2014.Originallyapproved in 1991.Last previous edition approved in 2006 as E1423 06.DOI:10.1520/E1423-14.2For 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.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.4Available from National Fenestration Rating Council(NFRC),6305 Ivy Lane,Suite 140,Greenbelt,MD 20770,http:/www.nfrc.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 through unit area of a test specimen and its boundary air films,induced by unit temperature difference between the environ-ments on each side.3.2 Definitions of Terms Specific to This Standard:3.2.1 standardized thermal transmittance,USTthe heattransfer in unit time through unit area of a specimen(usingstandardized surface heat transfer coefficients)induced by unittemperature difference between the environments on each side.Test Method C11993.2.2 surround panel(sometimes called the mask,mask