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【英文标准名称】:StandardPracticeforCalculatingThermalTransmissionPropertiesUnderSteady-StateConditions
【原文标准名称】:稳态条件下热传递性能的计算用标准实施规程
【标准号】:ASTMC1045-2007
【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】:C16.30
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:建筑;热流;热传递;测量;工艺;特性;隔热
【英文主题词】:calculation;thermalconductance;thermalconductivity;thermalproperties;thermalresistance;thermalresistivity;thermaltransmission
【摘要】:1.1Thispracticeprovidestheuserwithauniformprocedureforcalculatingthethermaltransmissionpropertiesofamaterialorsystemfromdatageneratedbysteadystate,onedimensionaltestmethodsusedtodetermineheatfluxandsurfacetemperatures.ThispracticeisintendedtoeliminatetheneedforsimilarcalculationsectionsinTestMethodsC177,C335,C518,C1033,C1114andC1363andPracticesC1043andC1044bypermittinguseofthesestandardcalculationformsbyreference.1.2Thethermaltransmissionpropertiesdescribedinclude:thermalconductance,thermalresistance,apparentthermalconductivity,apparentthermalresistivity,surfaceconductance,surfaceresistance,andoverallthermalresistanceortransmittance.1.3Thispracticeprovidesthemethodfordevelopingtheapparentthermalconductivityasafunctionoftemperaturerelationshipforaspecimenfromdatageneratedbystandardtestmethodsatsmallorlargetemperaturedifferences.ThisrelationshipcanbeusedtocharacterizematerialforcomparisontomaterialspecificationsandforuseincalculationprogramssuchasPracticeC680.1.4TheSIunitvaluesusedinthispracticeareconsideredstandard.1.5Thispracticeincludesadiscussionofthedefinitionsandunderlyingassumptionsforthecalculationofthermaltransmissionproperties.Teststodetectdeviationsfromtheseassumptionsaredescribed.Thispracticealsoconsidersthecomplicatingeffectsofuncertaintiesduetothemeasurementprocessesandmaterialvariability.SeeSection7.1.6Thispracticeisnotintendedtocoverallpossibleaspectsofthermalpropertiesdatabasedevelopment.Fornewmaterials,theusershouldinvestigatethevariationsinthermalpropertiesseeninsimilarmaterials.TheinformationcontainedinSection7,theAppendixandthetechnicalpaperslistedintheReferencessectionofthispracticemaybehelpfulindeterminingwhetherthematerialunderstudyhasthermalpropertiesthatcanbedescribedbyequationsusingthispractice.Someexampleswherethismethodhaslimitedapplicationinclude:(1)theonsetofconvectionininsulationasdescribedinReference(1);(2)aphasechangeofoneoftheinsulationsystemcomponentssuchasablowinggasinfoam;and(3)theinfluenceofheatflowdirectionandtemperaturedifferencechangesforreflectiveinsulations.
【中国标准分类号】:A42
【国际标准分类号】:17_200_10
【页数】:13P.;A4
【正文语种】: