ASTM E881-1992(2009) 在模拟滞留模式下暴露于自然气候下的太阳能收集器挡盖材料的标准实施规程
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【英文标准名称】:StandardPracticeforExposureofSolarCollectorCoverMaterialstoNaturalWeatheringUnderConditionsSimulatingStagnationMode
【原文标准名称】:在模拟滞留模式下暴露于自然气候下的太阳能收集器挡盖材料的标准实施规程
【标准号】:ASTME881-1992(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:1992
【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】:naturalweathering;solarcollectorcovers;stagnation;variable-angleexposure;weathering;Solarcollectors;Stagnationconditions;Weathering(solardevices)
【摘要】:Thispracticedescribesaweatheringboxtestfixtureandestablisheslimitsfortheheatlosscoefficients.Uniformexposureguidelinesareprovidedtominimizethevariablesencounteredduringoutdoorexposuretesting.Sincethecombinationofelevatedtemperatureandsolarradiationmaycausesomesolarcollectorcovermaterialstodegrademorerapidlythaneitherexposurealone,aweatheringboxthatelevatesthetemperatureofthecovermaterialsisused.Thispracticemaybeusedtoassistintheevaluationofsolarcollectorcovermaterialsinthestagnationmode.Nosingletemperatureorprocedurecanduplicatetherangeoftemperaturesandenvironmentalconditionstowhichcovermaterialsmaybeexposedduringstagnationconditions.Toassistinevaluationofsolarcollectorcovermaterialsintheoperationalmode,PracticeE782shouldbeused.Insufficientdataexisttoobtainexactcorrelationbetweenthebehaviorofmaterialsexposedinaccordancewiththispracticeandactualin-serviceperformance.Thispracticemayalsobeusefulincomparingtheperformanceofdifferentmaterialsatonesiteortheperformanceofthesamematerialatdifferentsites,orboth.MeansofevaluatingtheeffectsofweatheringareprovidedinPracticeE765,andinotherASTMtestmethodsthatevaluatematerialproperties.Exposuresofthetypedescribedinthispracticemaybeusedtoevaluatethestabilityofsolarcollectorcovermaterialswhenexposedoutdoorstothevariedinfluencesthatcompriseweather.Exposureconditionsarecomplexandchangeable.Importantfactorsarematerialtemperature,climate,timeofyear,presenceofindustrialpollution,etc.Generally,becauseitisdifficulttodefineormeasurepreciselythefactorsinfluencingdegradationduetoweathering,resultsofoutdoorexposuretestsmustbetakenasindicativeonly.Repeatedexposuretestingatdifferentseasonsoveraperiodofmorethanoneyearisrequiredtoconfirmexposuretestsatanyonelocation.Controlsamplesmustalwaysbeusedinweatheringtestsforcomparativeanalysis.1.1Thispracticecoversaprocedurefortheexposureofsolarcollectorcovermaterialstothenaturalweatherenvironmentatelevatedtemperaturesthatapproximatestagnationconditionsinsolarcollectorshavingacombinedbackandedgelosscoefficientoflessthan1.5W/(m2x00B7;x00B0;C).1.2Thispracticeissuitableforexposureofbothglassandplasticsolarcollectorcovermaterials.Provisionsaremadeforexposureofsingleanddoublecoverassembliestoaccommodatetheneedforexposureofbothinnerandoutersolarcollectorcovermaterials.1.3Thispracticedoesnotapplytocovermaterialsforevacuatedcollectors,photovoltaiccells,flat-platecollectorshavingacombinedbackandedgelosscoefficientgreaterthan1.5W/(m2x00B7;x00B0;C),orflat-platecollectorswhosedesignincorporatesmeansforlimitingtemperaturesduringstagnation.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:F12
【国际标准分类号】:27_160
【页数】:8P.;A4
【正文语种】:英语
【原文标准名称】:在模拟滞留模式下暴露于自然气候下的太阳能收集器挡盖材料的标准实施规程
【标准号】:ASTME881-1992(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:1992
【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】:naturalweathering;solarcollectorcovers;stagnation;variable-angleexposure;weathering;Solarcollectors;Stagnationconditions;Weathering(solardevices)
【摘要】:Thispracticedescribesaweatheringboxtestfixtureandestablisheslimitsfortheheatlosscoefficients.Uniformexposureguidelinesareprovidedtominimizethevariablesencounteredduringoutdoorexposuretesting.Sincethecombinationofelevatedtemperatureandsolarradiationmaycausesomesolarcollectorcovermaterialstodegrademorerapidlythaneitherexposurealone,aweatheringboxthatelevatesthetemperatureofthecovermaterialsisused.Thispracticemaybeusedtoassistintheevaluationofsolarcollectorcovermaterialsinthestagnationmode.Nosingletemperatureorprocedurecanduplicatetherangeoftemperaturesandenvironmentalconditionstowhichcovermaterialsmaybeexposedduringstagnationconditions.Toassistinevaluationofsolarcollectorcovermaterialsintheoperationalmode,PracticeE782shouldbeused.Insufficientdataexisttoobtainexactcorrelationbetweenthebehaviorofmaterialsexposedinaccordancewiththispracticeandactualin-serviceperformance.Thispracticemayalsobeusefulincomparingtheperformanceofdifferentmaterialsatonesiteortheperformanceofthesamematerialatdifferentsites,orboth.MeansofevaluatingtheeffectsofweatheringareprovidedinPracticeE765,andinotherASTMtestmethodsthatevaluatematerialproperties.Exposuresofthetypedescribedinthispracticemaybeusedtoevaluatethestabilityofsolarcollectorcovermaterialswhenexposedoutdoorstothevariedinfluencesthatcompriseweather.Exposureconditionsarecomplexandchangeable.Importantfactorsarematerialtemperature,climate,timeofyear,presenceofindustrialpollution,etc.Generally,becauseitisdifficulttodefineormeasurepreciselythefactorsinfluencingdegradationduetoweathering,resultsofoutdoorexposuretestsmustbetakenasindicativeonly.Repeatedexposuretestingatdifferentseasonsoveraperiodofmorethanoneyearisrequiredtoconfirmexposuretestsatanyonelocation.Controlsamplesmustalwaysbeusedinweatheringtestsforcomparativeanalysis.1.1Thispracticecoversaprocedurefortheexposureofsolarcollectorcovermaterialstothenaturalweatherenvironmentatelevatedtemperaturesthatapproximatestagnationconditionsinsolarcollectorshavingacombinedbackandedgelosscoefficientoflessthan1.5W/(m2x00B7;x00B0;C).1.2Thispracticeissuitableforexposureofbothglassandplasticsolarcollectorcovermaterials.Provisionsaremadeforexposureofsingleanddoublecoverassembliestoaccommodatetheneedforexposureofbothinnerandoutersolarcollectorcovermaterials.1.3Thispracticedoesnotapplytocovermaterialsforevacuatedcollectors,photovoltaiccells,flat-platecollectorshavingacombinedbackandedgelosscoefficientgreaterthan1.5W/(m2x00B7;x00B0;C),orflat-platecollectorswhosedesignincorporatesmeansforlimitingtemperaturesduringstagnation.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:F12
【国际标准分类号】:27_160
【页数】:8P.;A4
【正文语种】:英语
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