ASTM_E_2029_-_11.pdf

Designation:E202911Standard Test Method forVolumetric and Mass Flow Rate Measurement in a DuctUsing Tracer Gas Dilution1This standard is issued under the fixed designation E2029;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 test method describes the measurement of thevolumetric and mass flow rate of a gas stream within a duct,stack,pipe,mine tunnel,or flue using a tracer gas dilutiontechnique.For editorial convenience all references in the textwill be to a duct,but it should be understood that this couldrefer equally well to a stack,pipe,mine tunnel,or flue.This testmethod is limited to those applications where the gas streamand the tracer gas can be treated as ideal gases at the conditionsof the measurement.In this test method,the gas stream will bereferred as air,though it could be any another gas that exhibitsideal gas law behavior.1.2 This test method is not restricted to any particular tracergas although experimental experience has shown that certaingases are used more readily than others as suitable tracer gases.It is preferable that the tracer gas not be a natural componentof the gas stream.1.3 Use of this test method requires a knowledge of theprinciples of gas analysis and instrumentation.Correct use ofthe formulas presented here requires consistent use of units.1.4 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 to determine theapplicability of regulatory limitations prior to use.For specificprecautionary statements,see Section 7.2.Referenced Documents2.1 ASTM Standards:2E631 Terminology of Building Constructions2.2 ANSI/ASME Standards:3ANSI/ASME TC 19.11985(1994)Measurement Uncer-tainty:Instrument Apparatus3.Terminology3.1 Definitions:3.1.1 For definitions of general terms related to buildingconstruction used in this test method,refer to TerminologyE631.3.2 Definitions of Terms Specific to This Standard:3.2.1 ideal gas,na gas or gas mixture for which the ratioof the pressure divided by product of the density and tempera-ture is a constant.3.2.2 mass flow,nthe total mass of air passing the sam-pling point per unit time(kg/s,lb/min).3.2.3 tracer gas,na gas that can be mixed with air andmeasured in very low concentrations.3.2.4 tracer gas analyzer,na device that measures theconcentration of tracer gas in an air sample.3.2.5 tracer gas mass concentration,nthe ratio of themass of tracer gas in air to the total mass of the air-tracermixture.For an ideal gas,the mass concentration is indepen-dent of temperature and pressure.3.2.6 tracer gas molar concentration,nthe ratio of thenumber of moles of tracer gas in air to the total number ofmoles of the air-tracer mixture.3.2.7 tracer gas volume concentration,nthe ratio of thevolume of tracer gas in air to the total volume of the air-tracermixture.For an ideal gas,the volume concentration is inde-pendent of temperature and pressure and is equal to the molarconcentration.3.2.8 volumetric flow,nthe total volume of air passing thesampling point per unit time(m3/s,ft3/min).3.3 Symbols:1This test method is under the jurisdiction of ASTM Committee E06 onPerformance of Buildings and is the direct responsibility of Subcommittee E06.41on Air Leakage and Ventilation Performance.Current edition approved Sept.1,2011.Published October 2011.Originallyapproved in 1999.Last previous edition approved in 2004 as E2029 99(2004).DOI:10.1520/E2029-11.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 C=mass concentration4of tracer gas(ppb-mass,ppm-mass,ppt-mass)CU=upstream mass concentration4of tracer gas(ppb-mass,ppm-mass,ppt-mass)CD=downstream mass concentration4of tracer gas(ppb-mass,ppm-mass,ppt-mass)CI=injection stream mass concentration4of tracer gas(ppb-mass,ppm-mass,ppt-mass)c=volume concentration4of tracer gas(ppb,ppm,ppt)cU=upstream volume concentration4of tracer gas(ppb,ppm,ppt)cD=downstream volume concentration4of tracer gas(ppb,ppm,ppt)cI=injection volume concentration4of tracer gas(ppb,ppm,ppt)F=mass flow rate5(kg s,g/min,lb/min)FI=injection mass flow rate5(kg s,g/min,lb/min)FU=upstream mass flow rate5(kg s,g min,lb/min)FD=downstream mass flow rate5(kg s,g/min,lb/min)f=volumetric flow rate5(m3/s,L/min,cfm)fstd=volumetric flow rate at standard