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【英文标准名称】:StandardPracticeforDeterminationofThermalResistanceofLoose-FillBuildingInsulation
【原文标准名称】:松填建筑绝热材料隔热性能的测定用标准实施规程
【标准号】:ASTMC687-2007
【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;绝缘件;工艺;隔热;热稳定性
【英文主题词】:insulation;loose-fill;thermalresistance;Thermaltransmissionproperties;Heatflowmetermethod;Loose-fillthermalinsulation
【摘要】:Thethermalresistance,R,ofaninsulationisusedtodescribeitsthermalperformance.Thethermalresistanceofaninsulationisrelatedtothedensityandthicknessoftheinsulation.Itisdesirabletoobtaintestdataonthermalresistancesatthicknessesanddensitiesrelatedtotheendusesoftheproduct.Innormaluse,thethicknessoftheseproductsrangefromlessthan100mm(4in.)togreaterthan500mm(20in.).Installeddensitiesdependupontheproducttype,theinstalledthickness,theinstallationequipmentused,theinstallationtechniques,andthegeometryoftheinsulatedspace.Loose-fillinsulationsprovidecoverageinformationusingdensitiesselectedbymanufacturerstorepresenttheproductsettleddensities.Generally,itisnecessarytoknowtheproductthermalperformanceatarepresentativedensity.Somecoveragechartsutilizemultipledensitiestoshowthatgreaterthicknessinstallationsusuallyresultinhigherinstalleddensities.Theuseofmultipledensitiescanbedetectedfromthecoveragechartbycalculatingthedensityforseveraldifferentthermalresistancelevels.(Thedensityforagiventhermalresistancecanbecalculatedfromthecoveragechartbydividingtheminimummassperunitareabytheminimumthickness.)Ifthecalculateddensitiesaresignificantlydifferentatdifferentthermalresistances,themultipledensitystrategyhasbeenused.Whenapplicablespecificationsorcodesdonotspecifythenominalthermalresistanceleveltobeusedforcomparisonpurposes,arecommendedpracticeistousetheRsi(metric)=3.3m2K/W(RIP=19[hft2F/Btu])labeldensityandthicknessforthatmeasurement.Ifthedensityfortestpurposesisnotavailablefromthecoveragechart,atestdensityshallbeestablishedbyuseofapplicablespecificationsandcodesor,ifnoneapply,agreementbetweentherequestingbodyandthetestingorganization.Generally,thinsectionsofthesematerialsarenotuniform.Thus,thetestthicknessmustbegreaterthanorequaltotheproductx2019;srepresentativethicknessiftheresultsaretobeconsistentandtypicalofuse.Note18212;Therepresentativethicknessisspecificforeachproductandisdeterminedbyrunningaseriesoftestsinwhichthedensityisheldconstantbutthethicknessisincreased.Therepresentativethicknessisdefinedhereasthatthicknessabovewhichthereisnomorethana2%changeintheresistivityoftheproduct.Therepresentativethicknessisafunctionofproductblowndensity.Ingeneral,asthedensitydecreases,therepresentativethicknessincreases.Fortunately,mostproductsaredesignedtobeblownoverasmallrangeofdensities.Thislimitedrangeyieldsarangeofrepresentativethicknessesbetween100to200mm(4to8in.)formostproducts.TosimplifytheprocessforthisPractice,therepresentativethicknessfortheC687testsshallbedeterminedatthemidpointoftheblowndensityrange.Oncethisisaccomplished,allthermaltestingonthisproductisconductedatathicknessthatisgreaterorequaltotherepresentativethickness.Forthispractice,theminimumtestthicknessshallbe100mm(4in.)ortherepresentativethickness,whicheverislarger.Ifthetestistorepresentaninstallationatalesserthickness,theinstalledthicknessshallbeused.Becauseofthehighcostofconstructionandoperationoflargetestequipment,itisimpracticaltotestatthehigherthicknessesatwhichproductsareused.Forpurposesofthispractice,itisacceptabletoestimatethethermalresistanceatanythicknessfromthethermalresistivityobtainedfromtestsontheproductattheminimumtestthickn........
【中国标准分类号】:Q25
【国际标准分类号】:91_120_10
【页数】:10P.;A4
【正文语种】:


MIL-L-3918A, MILITARY SPECIFICATION LUBRICATING OIL, INSTRUMENT, JEWEL BEARING (28 SEPT 1970)., This specification covers one grade of low-temperature non-spreading lubricating oil for use on instrument jewel bearings.