ASTM E781-1986(2009) 暴露在有盖板的太阳能收集器中模拟滞流的条件下太阳能内存材料的吸收性评定的标准实施规范

作者:标准资料网 时间:2024-05-12 03:51:10  浏览:9776   来源:标准资料网

【英文标准名称】:StandardPracticeforEvaluatingAbsorptiveSolarReceiverMaterialsWhenExposedtoConditionsSimulatingStagnationinSolarCollectorsWithCoverPlates
【原文标准名称】:暴露在有盖板的太阳能收集器中模拟滞流的条件下太阳能内存材料的吸收性评定的标准实施规范
【标准号】:ASTME781-1986(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:1986
【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】:
【英文主题词】:absorber;absorptance;aging;coverplates;emittance;outdoorweathering;selectiveabsorber;solarcollectors;stagnation;thermaltesting;weathering;Absorption--solarmaterials;Coatings;Covermaterials--solarcollectors;Exposureresistance;Flat-p
【摘要】:Althoughthispracticeisintendedforevaluatingsolarabsorbermaterialsandcoatingsusedinflat-platecollectors,nosingleprocedurecanduplicatethewiderangeoftemperaturesandenvironmentalconditionstowhichthesematerialsmaybeexposedduringin-serviceconditions.Thispracticeisintendedasascreeningtestforabsorbermaterialsandcoatings.Allconditionsarechosentoberepresentativeofthoseencounteredinsolarcollectorswithsinglecoverplatesandwithnoaddedmeansoflimitingthetemperatureduringstagnationconditions.Thispracticeusesexposureinasimulatedcollectorwithasinglecoverplate.Althoughcollectorswithadditionalcoverplateswillproducehighertemperaturesatstagnation,thisprocedureisconsideredtoprovideadequatethermaltestingformostapplications.Note18212;Mathematicalmodellinghasshownthataselectiveabsorber,singleglazedflat-platesolarcollectorcanattainabsorberplatestagnationtemperaturesashighas226x00B0;C(437x00B0;F)withanambienttemperatureof37.8x00B0;C(100x00B0;F)andzerowindvelocity;andadoubleglazedoneashighas245x00B0;C(482x00B0;F)undertheseconditions.Thesameconfigurationsolarcollectorwithanonselectiveabsorbercanattainabsorberstagnationtemperaturesashighas146x00B0;C(284x00B0;F),ifsingleglazed,and185x00B0;C(360x00B0;F),ifdoubleglazed,withthesameenvironmentalconditions,(seex201C;PerformanceCriteriaforSolarHeatingandCoolingSystemsinCommercialBuildings,x201D;NBSTechnicalNote1187).Thispracticeevaluatesthethermalstabilityofabsorbermaterials.Itdoesnotevaluatethemoisturestabilityofabsorbermaterialsusedinactualsolarcollectorsexposedoutdoors.Moistureintrusionintosolarcollectorsisafrequentoccurrenceinadditiontocondensationcausedbydiurnalbreathing.Thispracticedifferentiatesbetweenthetestingofspectrallyselectiveabsorbersandnonselectiveabsorbers.TestingSpectrallySelectiveAbsorberCoatingsandMaterials8212;Spectrallyselectivesolarabsorptivecoatingsandmaterialsrequiretestinginacoveredenclosurethatcontainsaselectivelycoatedsamplemountingplate,suchthattheenclosureandmountingplatesimulatethetemperatureconditionsofaselectiveflat-platecollectorexposedunderstagnationconditions.TestingNonselectiveCoatingsandMaterials8212;Spectrallynonselectivesolarabsorptivecoatingsandmaterialsrequiretestinginacoveredenclosurethatcontainsanonselectivecoatedsamplemountingplate,suchthattheenclosureandmountingplatesimulatethetemperatureconditionsofacovered,nonselectiveflat-platecollectorexposedunderstagnationconditions.1.1Thispracticecoversatestprocedureforevaluatingabsorptivesolarreceivermaterialsandcoatingswhenexposedtosunlightundercoverplate(s)forlongdurations.Thispracticeisintendedtoevaluatetheexposureresistanceofabsorbermaterialsandcoatingsusedinflat-platecollectorswheremaximumnonoperationalstagnationtemperatureswillbeapproximately200x00B0;C(392x00B0;F).1.2Thispracticeshallnotapplytoreceivermaterialsusedinsolarcollectors......
【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】:英语