夏热冬冷地区VDSF自然通风实验研究与优化

以长沙作为夏热冬冷地区的典型城市,通过试验对位于长沙地区的一已搭建好的通风式双层皮玻璃幕墙自然通风和机械通风时热通道内的流场和温度场进行对比分析.研究表明,当玻璃间距分别为0.10,0.20,0.30和0.40m时,均可实现自然通风;当玻璃间距为0.30和0.40m时,自然通风和机械通风效果十分接近.对热通道内百叶的位置进行了试验研究,发现玻璃间距为0.40m,百叶位于离外玻璃0.10m或位于热通道正中间时,自然通风和机械通风效果基本一致.结合Fluent软件分别对自然通风状态下通风式双层皮玻璃幕墙玻璃间距为0.30和0.40m,百叶位置位于离外玻璃0.10m及位于热通道正中间的情形分别进行流场和温度场的模拟对比分析.结果表明,夏季,通风式双层皮玻璃幕墙自然通风下的最佳玻璃间距是0.30m,百叶离外层玻璃0.10m.

Experimental Research and Optimization of Natural Ventilation for VDSF in Zones Hot in Summer and Cold in Winter

Changsha is a typical zone hot in summer and cold in winter. By using the method of experiment, natural and mechanical ventilation's flow fields and temperature fields of a VDSF, which has been built in Changsha, its features were analyzed and compared. When the glazing spacing of glass curtain was 0.10 m,0.20 m,0.30 m and 0.40 m, natural ventilation could all be realized, and the effect of the latter two's natural and mechanical ventilation was very close. Also, the positions of the blind in the heat passage were studied, and the results showed that, when the glazing spacing was 0.40 m and the blind was located in the middle position or at a distance of 0.10 m from the external wall, the effect of natural ventilation and mechanical ventilation was basically identical. In order to find out the natural ventilation's optimum glazing spacing and the best position of the blind in summer, this paper has simulated four conditions with Fluent respectively, the glazing spacing was 0.30 m and 0.40 m, and the blind was located in the middle position at a distance of 0.10 m from the external wall. The results showed that, in summer, the natural ventilation's optimum glazing spacing is 0.30 m, and the blind from the outer glass is 0.10 m.