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【英文标准名称】:StandardTableforReferenceSolarSpectralDistributions:DirectandDiffuseon20x00B0;TiltedandVerticalSurfaces
【原文标准名称】:太阳光光谱分布参考标准表:20°倾角和垂直面的直射和漫射
【标准号】:ASTMG197-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:G03.09
【标准类型】:(Table)
【标准水平】:()
【中文主题词】:
【英文主题词】:albedo;building;collector;daylight;diffuseradiation;directradiation;fenestration;glazing;photovoltaic;reflectance;skylight;solarenergy;solarspectralirradiance;terrestrial;transmittance;window
【摘要】:Thisstandarddoesnotpurporttoaddressthemeanspectralirradianceincidentontiltedorverticalfenestrationorbuilding-integratedsystemsoveraday,aseason,orayear.Thespectralirradiancedistributionshavebeenchosentorepresentareasonablenear-upperlimitforsolarradiationwhenthesesystemsareexposedtoclear-skyconditionssimilartothoseusedtocalculatesolarheatloadsofbuildings.Thediffusespectralirradiancedistributionscanalsobeusedtorepresentconditionswhenthesesystemsareshadedfromthedirectsun.Absorptance,reflectance,andtransmittanceofsolarradiationareimportantfactorsinstudiesoflighttransmissionthroughsemi-transparentplates.Thesepropertiesarenormallyfunctionsofwavelength,whichrequirethatthespectraldistributionofthesolarfluxbeknownbeforethesolar-weightedpropertycanbecalculated.Tocomparetherelativeperformanceofcompetitiveproductsbycomputerizedsimulations,ortocomparetheperformanceofproductssubjectedtoexperimentaltestsinlaboratoryconditions,areferencestandardsolarspectraldistributionforbothdirectanddiffuseirradianceisdesirable.Thetableprovidesappropriatestandardspectralirradiancedistributionsfordeterminingtherelativeopticalperformanceofsemi-transparentmaterialsandothersystems.Thetablemaybeusedtoevaluatecomponentsandmaterialsforthepurposeofsolarsimulationwherethedirectandthediffusespectralsolarirradiancesareneededseparately.Theselectedairmassvalueof1.5foraplane-parallelatmosphereaboveaflatearthcorrespondstoazenithangleof48.19x00B0;.TheSMARTS2computationofairmassaccountsforatmosphericcurvatureandtheverticaldensityprofileofmolecules,whichresultsinasolarzenithangleof48.236x00B0;,oranequivalentplane-parallel-atmosphereairmassof1.50136.TheangleofincidencecomputedbySMARTSforthedirectbeamirradianceincidentona20x00B0;-tiltedplanefacingthesunisthus28.236x00B0;.Itis41.764x00B0;fora90x00B0;-tiltedsurfacefacingthesun.AplotoftheSMARTSmodeloutputforthereferencedirectradiationona20x00B0;and90x00B0;tiltedsurfacesisshowninFig.1.Asimilarplot,butfordiffuseradiation,isshowninFig.2.TheinputneededbySMARTStogeneratethespectrafortheprescribedconditionsandthe20x00B0;-tiltedsurfaceisprovidedinTable1.Theinputfileforthe90x00B0;-tiltedsurfacediffersonlybyoneline.ThismodifiedlineappearsinTable2.Thetotalirradiance,integratedoverthespectralrange280x2013;4000nm,is791.07and97.96Wx00B7;m-2fordirectanddiffuseradiationincidentonthe20x00B0;tiltedsurface,respectively.Itis669.74and140.56Wx00B7;m-2fordirectanddiffuseradiationincidentonthe90x00B0;tiltedsurface,respectively.TheavailabilityoftheadjunctstandardcomputersoftwareforSMARTSallowsoneto(a)reproducethereferencespectra,usingtheaboveinputparameters;(b)computetestspectratoattempttomatchmeasureddataataspecifiedFWHM,andevaluateatmosphericconditions;(c)computetestspectrarepresentingspecificconditionsforanalysisvis-?/span>-visanyoneoralloftherefere......