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首页> 外文期刊>Arabian Journal for Science and Engineering >Thermal Analysis and Thickness Optimization of Two-Cavity Thermal Insulator in Buildings
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Thermal Analysis and Thickness Optimization of Two-Cavity Thermal Insulator in Buildings

机译：建筑两腔式绝热层的热分析和厚度优化

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摘要

This work presents an analytical and computational study on the use of two separated air cavities, located in common walls and roofs, as an application for thermal insulation in buildings. The aspect ratios of the two cavities were varied from 10 to 100. Firstly, the thermal analysis is performed, under the assumption that air in the two cavities is motionless, to determine the influence of cavity aspect ratio. The results show that the thermal diffusivity of buildings' wall and roof components is sensitive to the presence of first and second air cavities as well as to the variation of cavity aspect ratio. In addition, the natural convection thermal analysis across the two separated air cavities, for isothermal case, was performed to assess the influence of aspect ratio on various natural convection parameters. The results show that the Rayleigh number decreases with small range of aspect ratio, but remain nearly constant in high range of aspect ratio. The optimum aspect ratio of the two separated air cavities (i.e., optimum cavities thicknesses) is determined. At each air cavity, the optimum cavity aspect ratio will be at a location where Nusselt number . At this location, the natural convection heat transfer rate approximates pure conduction heat transfer rate, and thus, the cavities can work optimally as thermal insulators. The results revealed that the optimum aspect ratios for the two wall and two roof air cavities are 50 and 52.6 corresponding to optimum thicknesses of 0.02 and 0.019 m, respectively.
机译：这项工作提出了关于使用位于共同的墙壁和屋顶中的两个独立气腔作为建筑物隔热应用的分析和计算研究。两个腔的长宽比从10到100不等。首先，在两个腔中的空气不动的前提下进行热分析，以确定腔长宽比的影响。结果表明，建筑物墙壁和屋顶组件的热扩散率对第一和第二气腔的存在以及腔长宽比的变化敏感。此外，在等温情况下，对两个分开的气腔进行自然对流热分析，以评估纵横比对各种自然对流参数的影响。结果表明，瑞利数在长宽比小的范围内减小，但是在长宽比大的范围内几乎保持恒定。确定两个分开的空气腔的最佳纵横比（即，最佳的腔厚度）。在每个空气腔中，最佳腔宽比将位于Nusselt数的位置。在此位置，自然对流传热速率接近于纯传导传热速率，因此，型腔可以作为绝热体发挥最佳作用。结果表明，两个壁和两个屋顶气腔的最佳长宽比分别为50和52.6，分别对应于0.02和0.019 m的最佳厚度。

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