热线法测量建筑保温材料热导率和热扩散率的分析

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1、万方数据conductivityandthermaldiffusivitymeasuredbyhotwiresurface—parallelmethodwasstable．whileitshowed1agefluctuationforthatofthefoamglasses．Thehotwireisdeterminedasthenichromewirewithradiusof0．095mm．Thecorrespondingminimumeffectivetestingtime(rmi。)iS140s，andthe

2、maximumeffectivetestingtime(‰毋)isthemomentwhenthetemperatureincreasesbvO．1℃comparedwiththeinitialtemperatureatthetopsurface．Theappropriaterangeofthelinearheatfluxfortheorganicfoaminsulationmaterials．theaeratedconcreteblockandthefoamglassesare0．7-3．7W／m，5-11W／

3、m，and2～9W恤respectively．Avisualdataacquisitionandprocessingsot}warewasdesignedbasedontheVisualStudio．NET2008platform．(5)Thethermalconductivitiesandthermaldiffusivitiesoftheorganicfoaminsulationmaterials．theaeratedconcreteblockandthefoamglassesweremeasuredwitht

4、hehotwiresurface．parallelmethod．Anewsimplifiedmethodforthetestofthermalwasproposed．Itshowsthatthetestingaccuracyofthethermalishighwiththehotwiresurfacemethod．andtheerrorofthethermaliSwithin3．4％forEPSplate．Thetestingerrorofthermaldiffusivityislargewiththehotwi

5、resurfacemethod．whichiSresultedfromthelocationdifferenceofthetemperaturemeasuringpoint．Thethermaldiffusivitiesmeasuredareingeneralaccordwiththeliteraturevalue．ThenewsimplifiedmethodforthetestofthermalCaDbeusedtomeasurethethermalrapidlyandreliablyforthethermal

6、insulationmaterials．thoughitsaccuracyiSalittlelowerthanthatofthehotwiresurface．parallelmethod．26figures，34tablesand70references．Keywords：hotwiresurface-parallelmethod，thermalconductivity,thermaldiffusivity,numericalcomputation．thermalinsulationmaterialsforbui

7、ldingapplicationClassification：0511．3V万方数据符号说明热扩散率，m2．s’1拟合直线的斜率拟合直线的截距比热容，J·埏～·K．1自然对流换热系数，W·m-2．K。1线热流密度，W·m。1热丝半径，mm热电偶平行放置时距离热丝距离，mm均匀初始温度，℃欧拉常数试样厚度，mm拟合直线斜率误差拟合直线截距误差测试装置系统误差热电偶测试误差电流测试误差电阻测试误差无纸记录仪仪测试误差密度测试误差长度测试误差温升，℃r』时刻温升，℃砣时刻温升，℃热导率，W·m．1·K-1密度，kg·m

8、’3时间，S最小有效测试时间，S最大有效测试时间，Sd彳Bc^卯内R乃丫J以如‰鼬‰c暑!鼬％口仇眈Apr‰万方数据目录原创性声明⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯I摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．IIAbstrct⋯⋯．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．⋯．⋯⋯⋯⋯⋯⋯⋯．．．