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【英文标准名称】:StandardTestMethodsforDeterminingAirLeakageofAirDistributionSystemsbyFanPressurization
【原文标准名称】:风扇增压法测定空气分布系统的漏气量的标准试验方法
【标准号】:ASTME1554-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E06.41
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:空气分布;测试;通风设备;通风机
【英文主题词】:airdistribution;airleakage;distributionsystem;ducts;fieldmethod
【摘要】:Airleakagebetweenanairdistributionsystemandunconditionedspacesaffectstheenergylossesfromthedistributionsystem,theventilationrateofthebuilding,andtheentryrateofairpollutants.Thedeterminationofinfiltrationenergyloadsandventilationratesofresidencesandsmallcommercialbuildingsaretypicallybasedontheassumptionthattheprincipaldrivingforcesforinfiltrationandventilationarethewindandindoor/outdoortemperaturedifferences.Thiscanbeaninappropriateassumptionforbuildingsthathavedistributionsystemsthatpassthroughunconditionedspaces,becausetheexistenceofrelativelymodestleakagefromthatsystemhasarelativelylargeimpactonoverallventilationrates.Theairleakagecharacteristicsoftheseexteriordistributionsystemsareneededtodeterminetheirventilation,energy,andpollutant-entryimplications.Airleakagethroughtheexteriorairdistributionenvelopemaybetreatedinthesamemannerasairleakageinthebuildingenvelopeaslongasthesystemisnotoperating(seeTestMethodE779).However,whenthesystemblowerison,thepressuresacrosstheairdistributionsystemleaksareusuallysignificantlylargerthanthosedrivingnaturalinfiltration.Dependingonthesizeoftheleaks,thesepressurescaninducemuchlargerflowsthannaturalinfiltration.Thus,itisimportanttobeabletoisolatetheseleaksfrombuildingenvelopeleaks.Theleakageofairdistributionsystemsmustbemeasuredinthefield,becauseithasbeenshownthatworkmanshipandinstallationdetailsaremoreimportantthandesignindeterminingtheleakageofthesesystems.Forcodes,standards,andothercomplianceorqualitycontrolapplications,theprecisionandrepeatabilityatmeetingaspecifiedtarget(forexample,airflowatreferencepressure)ismoreimportantthanairleakageflowsatoperatingconditions.Someexistingcodes,standards,andvoluntaryprogramsrequiretheuseofasimplertestmethod(TestMethodD)thatdoesnotseparatesupplyfromreturnleakage,leakagetoinsidefromleakagetooutside,orestimateleakagepressuresatoperatingconditions.5.5TestMethodsA,B,andCcanbeusedforenergyusecalculationsandcomplianceandqualitycontrolapplications.TestMethodDisintendedforuseincomplianceandqualitycontrolonly.1.1Thetestmethodsincludedinthisstandardareapplicabletotheairdistributionsystemsinlow-riseresidentialandcommercialbuildings.1.2Thesetestmethodscoverfourtechniquesformeasuringtheairleakageofairdistributionsystems.Thetechniquesuseairflowandpressuremeasurementstodeterminetheleakagecharacteristics.1.3Thetestmethodsfortwoofthetechniquesalsospecifytheauxiliarymeasurementsneededtocharacterizethemagnitudeofthedistributionsystemairleakageduringnormaloperation.1.4Atestmethodforthetotalrecirculatingairflowinducedbythesystemblowerisincludedsothattheairdistributionsystemleakagecanbenormalizedasisoftenrequiredforenergycalculations.1.5Theproperuseofthesetestmethodsrequiresknowledgeoftheprinciplesofairflowandpressuremeasurements.1.6Threeofthesetestmethodsareintendedtoproduceameasureoftheairleakagefromtheairdistributionsystemtooutside.Theothertestmethodmeasurestotalairleakageincludingairleakstoinsideconditionedspace.1.7ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.1.8Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.