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【英文标准名称】:StandardPracticeforUsingaGuarded-Hot-PlateApparatusorThin-HeaterApparatusintheSingle-SidedMode
【原文标准名称】:使用单面护热板设备或薄型加热器设备的标准实施规程
【标准号】:ASTMC1044-2007
【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;测量仪器;工艺;特性;隔热
【英文主题词】:guarded-hot-plateapparatus;heatflow;single-sided;steadystate;thermalinsulation;thin-heaterapparatus
【摘要】:Thispracticeprovidesaprocedureforoperatingtheapparatussothattheheatflow,Qx2032;,throughthemetersectionoftheauxiliaryinsulationissmall;determiningQx2032;;and,calculatingtheheatflow,Q,throughthemetersectionofthespecimen.Thispracticerequiresthattheapparatushaveindependenttemperaturecontrolsinordertooperatethecoldplateandauxiliarycoldplateatdifferenttemperatures.Inthesingle-sidesmode,theapparatusisoperatedwiththetemperatureoftheauxiliarycoldplatemaintained,ascloseaspossible,tothetemperatureofthesideofthehotplateadjacenttotheauxiliaryinsulation.Note48212;Ideally,ifthetemperaturedifferenceacrosstheauxiliaryinsulationiszeroandtherearenoedgeheatlossesorgains,allofthepowerinputtothemeterplatewillflowthroughthespecimen.Inpractice,asmallcorrectionismadeforheatflow,Qx2032;,throughtheauxiliaryinsulation.Thethermalconductance,Cx2032;,oftheauxiliaryinsulationmustbedeterminedfromoneormoreseparatetestsusingeitherTestMethodC177,C1114,orasindicatedin5.4.ThevaluesofCx2032;shouldbecheckedperiodically,particularlyifduringregulartestingitisnotpossibletokeepthetemperaturedropacrosstheauxiliaryinsulationlessthan1%ofthetemperaturedropacrossthetestspecimen.Thispracticecanbeusedwhenitisdesirabletodeterminethethermalpropertiesofasinglespecimen.Forexample,thethermalpropertiesofasinglespecimenareusedtocalibrateaheat-flow-meterapparatusforTestMethodC518.Inothercases,theremaybeonlyonespecimenavailable.1.1Thispracticecoversthedeterminationofthesteady-stateheatflowthroughthemetersectionofaspecimenwhenaguarded-hot-plateapparatusorthin-heaterapparatusisusedinthesingle-sidedmodeofoperation.1.2ThispracticeprovidesasupplementalprocedureforuseinconjunctionwitheitherTestMethodC177orC1114fortestingasinglespecimen.Thispracticeislimitedtoonlythesingle-sidedmodeofoperation,and,inallotherparticulars,therequirementsofeitherTestMethodC177orC1114apply.Note1-TestMethodsC177andC1114describetheuseoftheguarded-hot-plateandthin-heaterapparatus,respectively,fordeterminingsteady-stateheatfluxandthermaltransmissionpropertiesofflat-slabspecimens.Inprinciple,thesemethodscoverboththedouble-andsingle-sidedmodeofoperation,andatpresent,donotdistinguishbetweentheaccuraciesforthetwomodesofoperation.Whenappropriate,thermaltransmissionpropertiesshallbecalculatedinaccordancewithPracticeC1045.1.3Thispracticerequiresthatthecoldplatesoftheapparatushaveindependenttemperaturecontrols.Forthesingle-sidedmodeofoperation,a(single)specimenisplacedbetweenthehotplateandthecoldplate.Auxiliarythermalinsulation,ifneeded,isplacedbetweenthehotplateandtheauxiliarycoldplate.Theauxiliarycoldplateandthehotplatearemaintainedatessentiallythesametemperature.Ideally,theheatflowfromthemeterplateisassumedtoflowonlythroughthespecimen,sothatthethermaltransmissionpropertiescorrespondonlytothespecimen.Note2-Thedouble-sidedmodeofoperationrequiressimilarspecimensplacedoneithersideofthehotplate.Thecoldplatesthatcontacttheoutersurfacesofthesesp......
【中国标准分类号】:A42
【国际标准分类号】:17_200_10
【页数】:8P.;A4
【正文语种】: