本报告介绍了两项不同的实验研究的结果，以开发一种在工业建筑上设计短屋顶烟囱的程序。这些研究是ASHRAE RP-136的延伸，该研究调查了建筑物表面通风口和进气口之间的废气稀释。本报告的第一部分介绍了在水道中进行的流动可视化研究，使用染料注入来可视化模型建筑上方的屋顶流动模式。报告的第二部分介绍了烟囱高度对屋顶水平进气口废气稀释影响的风洞研究。风洞实验补充了流动可视化研究，提供了不同建筑结构上不同烟囱高度下废气稀释率的定量信息。

This report presents the results of two different experimental studies to develop a procedure for designing short roof mounted stacks on industrial buildings. These studies are an extension of ASHRAE RP-136, which investigated the dilution of exhaust gases between vent and intake locations on building surfaces.PART I of this report presents a flow visualization study carried out in a water channel using dye injection to visualize roof flow patterns over model buildings.PART II of the report presents a wind tunnel study of the effect of stack height on exhaust gas dilution to roof level air intakes. The wind tunnel experiments complimented the flow visualization study by providing quantitative information on rates of exhaust gas dilution for varying stack height on different building configurations.