用瞬态法对竖板封闭夹层内自然对流换热的研究——双层玻璃窗最佳间距的确定

Application of the Transient Method to the Investigation of Natural Convective Heat Transfer in Vertical Rectangular Enclosures ——The Determination of. the Optimal Space Gap of Double-Glazed Windows

将瞬态卡计法运用于竖板封闭夹层内自然对流换热的研究,得到了分区的无量纲换热准则公式。公式值与文献平均值比较吻合,实验误差小于8.8%。利用所得公式,导出了确定双层玻璃窗最佳间距的方程,并对一些特例给出了计算结果。

This paper presents a new method which has been successfully used for the investigation of natural convection in vertical rectangular enclosures. Based upon this method, two dimensionless correlations for different regions are obtained, The calculated results of our correlations are in good agreement with the average values of the correlations of various investigators. The error of experimental resultsis smaller than 8.8%. Based upon our relations, the relation which can be used to calculate the optimal space gap of a double-glazed window is obtained. For some special cases, the calculated results are presented.