ASTM C1549-2009 使用便携式太阳反射计测定接近室内温度太阳反射比的标准试验方法

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【英文标准名称】:StandardTestMethodforDeterminationofSolarReflectanceNearAmbientTemperatureUsingaPortableSolarReflectometer
【原文标准名称】:使用便携式太阳反射计测定接近室内温度太阳反射比的标准试验方法
【标准号】:ASTMC1549-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:portablereflectometer;reflectometer;solarreflectance;solarreflectometer;Ambienttemperature;Portablereflectometer;Reflectanceandreflectivity--solardevices;Reflectometer/reflectrometry;Solarreflectance
【摘要】:Thetemperaturesofopaquesurfacesexposedtosolarradiationaregenerallyhigherthantheadjacentairtemperatures.Inthecaseofroofsorwallsenclosingconditionedspaces,increasedinwardheatflowsresult.Inthecaseofequipmentorstoragecontainersexposedtothesun,increasedoperatingtemperaturesusuallyresult.Theextenttowhichsolarradiationaffectssurfacetemperaturesdependsonthesolarreflectanceoftheexposedsurface.Asolarreflectanceof1.0(100%reflected)wouldmeannoeffectonsurfacetemperaturewhileasolarreflectanceof0(nonereflected,allabsorbed)wouldresultinthemaximumeffect.Coatingsofspecificsolarreflectanceareusedtochangethetemperatureofsurfacesexposedtosunlight.Coatingsandsurfacefinishesarecommonlyspecifiedintermsofsolarreflectance.Theinitial(clean)solarreflectancemustbemaintainedduringthelifeofthecoatingorfinishtohavetheexpectedthermalperformance.Thetestmethodprovidesameansforperiodictestingofsurfacesinthefieldorinthelaboratory.Monitorchangesinsolarreflectanceduetoagingandexposure,orboth,withthistestmethod.Thistestmethodisusedtomeasurethesolarreflectanceofaflatopaquesurface.Theprecisionoftheaverageofseveralmeasurementsisusuallygovernedbythevariabilityofreflectancesonthesurfacebeingtested.UsethesolarreflectancethatisdeterminedbythismethodtocalculatethesolarenergyabsorbedbyanopaquesurfaceasshowninEq1.1.1Thistestmethodcoversatechniquefordeterminingthesolarreflectanceofflatopaquematerialsinalaboratoryorinthefieldusingacommercialportablesolarreflectometer.Thepurposeofthetestmethodistoprovidesolarreflectancedatarequiredtoevaluatetemperaturesandheatflowsacrosssurfacesexposedtosolarradiation.1.2ThistestmethoddoesnotsupplantTestMethodE903whichmeasuressolarreflectanceoverthewavelengthrange250to2500nmusingintegratingspheres.Theportablesolarreflectometeriscalibratedusingspecimensofknownsolarreflectancetodeterminesolarreflectancefrommeasurementsatfourwavelengthsinthesolarspectrum:380nm,500nm,650nm,and1220nm.ThistechniqueissupportedbycomparisonofreflectometermeasurementswithmeasurementsobtainedusingTestMethodE903.Thistestmethodisapplicabletospecimensofmaterialshavingbothspecularanddiffuseopticalproperties.Itisparticularlysuitedtothemeasurementofthesolarreflectanceofopaquematerials.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:F12
【国际标准分类号】:27_160
【页数】:6P.;A4
【正文语种】:英语