ASTM C1340-2004 通过计算机程序的使用对通过含辐射阻碍物的顶楼天花板得热和散热评估的标准规程

作者:标准资料网 时间:2024-05-03 12:41:29  浏览:8520   来源:标准资料网

【英文标准名称】:StandardPracticeforEstimationofHeatGainorLossThroughCeilingsUnderAtticsContainingRadiantBarriersbyUseofaComputerProgram
【原文标准名称】:通过计算机程序的使用对通过含辐射阻碍物的顶楼天花板得热和散热评估的标准规程
【标准号】:ASTMC1340-2004
【标准状态】:现行
【国别】:
【发布日期】:2004
【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】:C16.21
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:建筑;热损失;计算方法;计算机软件
【英文主题词】:atticradiantbarriersystem;computerprogram;heatgain;heatloss
【摘要】:Manufacturersofradiantbarriersexpresstheperformanceoftheirproductsintermsofthetotalhemisphericalemittance.Thepurposeofaradiantbarrieristodecreasetheradiationheattransferacrosstheatticairspace,andhence,todecreasetheheatlossorgainthroughtheceilingbelowtheattic.Theamountofdecreaseinheatflowwilldependuponanumberoffactors,suchasweatherconditions,amountofmassorreflectiveinsulationintheattic,solarabsorptanceoftheroof,geometryoftheatticandroof,andamountandtypeofatticventilation.Becauseoftheinfinitecombinationsofthesefactors,itisnotpracticaltopublishdataforeachpossiblecase.Thecalculationofheatlossorgainofasystemcontainingradiantbarriersismathematicallycomplex,andbecauseoftheiterativenatureofthemethod,itisbesthandledbycomputers.Computersarenowwidelyavailabletomostproducersandconsumersofradiantbarrierstopermittheuseofthispractice.Theuserofthispracticemaywishtomodifythedatainputtorepresentaccuratelythestructure.Thecomputerprogramalsomaybemodifiedtomeetindividualneeds.Also,additionalcalculationsmaybedesired,forexample,tosumthehourlyheatflowsinsomefashiontoobtainestimatesofseasonalorannualenergyusages.Thismightbedoneusingthehourlydataasinputstoawhole-housemodel,andbychoosinghousebalancepointstouseascutoffpointsinthesummations.1.1Thispracticecoverstheestimationofheatgainorlossthroughceilingsunderatticscontainingradiantbarriersbyuseofacomputerprogram.Thecomputerprogramincludedasanadjuncttothispracticeprovidesacalculationalprocedureforestimatingtheheatlossorgainthroughtheceilingunderanatticcontainingatrussorraftermountedradiantbarrier.Theprogramalsoisapplicabletotheestimationofheatlossorgainthroughceilingsunderanatticwithoutaradiantbarrier.Thisprocedureutilizeshour-by-hourweatherdatatoestimatethehour-by-hourceilingheatflows.Theinteriorofthehousebelowtheceilingisassumedtobemaintainedataconstanttemperature.Atpresent,theprocedureisapplicabletosloped-roofatticswithrectangularfloorplanshavinganunshadedgabledroofandahorizontalceiling.Itisnotapplicabletostructureswithflatroofs,vaultedceilings,orcathedralceilings.Thecalculationalaccuracyalsoislimitedbythequalityofphysicalpropertydatafortheconstructionmaterials,principallytheinsulationandtheradiantbarrier,andbythequalityoftheweatherdata.1.2Undersomecircumstances,interactionsbetweenradiantbarriersandHVACductsinatticscanhaveasignificanteffectonthethermalperformanceofabuilding.Ductsareincludedinanextensionofthecomputermodelgivenintheappendix.1.3Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.
【中国标准分类号】:P32
【国际标准分类号】:91_120_10
【页数】:21P.;A4
【正文语种】: