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Design and Performance Evaluation of Advanced Window Systems

机译：高级窗口系统的设计与性能评估

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This paper presents the results of a study to compare the heat transfer characteristics of silica aerogels to that of air. A small window unit was made with a section having monolithic silica aerogels sandwiched between two plates of window glass. Another section had just an air space in between. Upon constant heating, steady state temperature measurements were made across the window unit. These data were used to infer apparent thermal resistance values for each case. The measured results showed that the aerogel insulation had a thermal resistance approximately 20% greater than that of air alone. A numerical heat transfer model of the system was developed in Cosmosworks. The model was used to match the experimental results and determine calculated thermal conductivity values for each of the interface cases: silica aerogel and air. The calculated thermal conductivity value of the aerogel matched well with typical values for this material. The calculated value for air though was approximately four times higher than the published value. This difference was attributed to the occurrence of free convection in the air space which was not accounted for in the model.
机译：本文提出了一种研究的结果，用于将二氧化硅气凝胶的传热特性与空气的传热特性进行比较。使用具有夹在窗玻璃的两个板之间的单片二氧化硅气凝胶的部分进行小窗口单元。另一个部分只是介于两者之间的空中空间。在恒定加热时，侧窗口单元进行稳态温度测量。这些数据用于推断出每种情况的表观热阻值。测量结果表明，气凝胶绝缘的热阻约为20％而不是单独的空气。在COSMOSWORKS中开发了系统的数值传热模型。该模型用于匹配实验结果并确定每个界面壳体的计算的导热率值：二氧化硅气凝胶和空气。气凝胶的计算的导热率值与该材料的典型值良好匹配。空气的计算值虽然比公布值高约四倍。这种差异归因于在模型中未占的空间中的自由对流。

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