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【英文标准名称】:StandardPracticeforEvaluatingSolarAbsorptiveMaterialsforThermalApplications
【原文标准名称】:加热设备用太阳能吸收材料评定的标准实施规程
【标准号】:ASTME744-2007
【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】:E44.05
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:工程设计;评定;太阳能;热的
【英文主题词】:absorptance;aging;emittance;laboratoryexposure;outdoorweathering;solarcollectors;thermalcycling;thermalstagnation;xenonarc
【摘要】:Themethodsinthispracticeareintendedtoaidintheassessmentoflong-termperformancebycomparativetestingofabsorptivematerials.Theresultsofthemethods,however,havenotbeenshowntocorrelatetoactualin-serviceperformance.Thetestingmethodologyinthispracticeprovidestwotestingmethods,inaccordancewithFig.1.4.2.1MethodA,whichaimsatdecreasingthetimerequiredforevaluation,usesaseriesofindividualteststosimulatevariousexposureconditions.4.2.2MethodButilizesasingletestofactualoutdoorexposureunderconditionssimulatingthermalstagnation.4.2.3Equivalencyofthetwomethodshasnotyetbeenestablished.FIG.1OutlineofTestMethodOptions1.1Thispracticecoversatestingmethodologyforevaluatingabsorptivematerialsusedinflatplateorconcentratingcollectors,withconcentratingratiosnottoexceedfive,forsolarthermalapplications.Thispracticeisnotintendedtobeusedfortheevaluationofabsorptivesurfacesthatare(1)usedindirectcontactwith,orsuspendedin,aheat-transferliquid,(thatis,tricklecollectors,directabsorptionfluids,etc.);(2)usedinevacuatedcollectors;or(3)usedincollectorswithoutcoverplate(s).1.2Testmethodsincludedinthispracticearepropertymeasurementtestsandagingtests.Propertymeasurementtestsprovideforthedeterminationofvariouspropertiesofabsorptivematerials,forexample,absorptance,emittance,andappearance.Agingtestsprovideforexposureofabsorptivematerialstoenvironmentsthatmayinducechangesinthepropertiesoftestspecimens.Measuringpropertiesbeforeandafteranagingtestprovidesameansofdeterminingtheeffectoftheexposure.1.3Theassumptionismadethatsolarradiation,elevatedtemperature,temperaturecycles,andmoisturearetheprimaryfactorsthatcausedegradationofabsorptivematerials.Agingtestsaredescribedforexposureofspecimenstothesefactors.Note1-Forsomegeographiclocations,otherfactors,suchassaltsprayanddusterosion,maybeimportant.Theyarenotevaluatedbythispractice.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:F12
【国际标准分类号】:27_160
【页数】:4P.;A4
【正文语种】: