目前设计排气管高度和出口速度的方法是基于避免污染烟囱所在建筑物的屋顶、墙壁和附近地面。通常情况下，不考虑相邻建筑物的影响，如果它们位于逆风位置，则会增加湍流和扩散，如果它们位于排放建筑物的顺风位置，则可能会受到污染。为了解释这些相邻建筑的影响，ASHRAE研究项目897使用大气的水道模拟来评估1700多种不同配置的屋顶污染，包括相邻建筑的高度、宽度、间距、烟囱位置、烟囱直径、高度和出口速度。 在平屋顶建筑的缩尺模型上，使用荧光染料示踪剂对排气管进行了测试，该示踪剂由薄激光光片照明，并带有数字视频图像，以测量屋顶水平进气口处排气羽流中的稀释度。结果表明，代表排放建筑良好设计的高烟囱和出口速度可能不太有效，有时在减少附近建筑屋顶污染方面会适得其反。本文讨论了这项研究对制定实用的烟囱设计指南的意义。单位:双引文: 研讨会，ASHRAE交易，1998年，第104卷，第2部分，多伦多

Current methods for designing exhaust stack height and exit velocity are based on avoiding contamination of the roof, walls, and nearby ground surface of the building on which the stack is located. Usually, no account is taken of the effect of adjacent buildings that add turbulence and increase dispersion if they are located upwind and may be contaminated themselves if they are downwind of the emitting building. To account for these adjacent building effects, ASHRAE Research Project 897 used water-channel simulation of the atmosphere to evaluate rooftop contamination in more than 1,700 different configurations of adjacent building height, width, spacing, stack location, stack diameter, height, and exit velocity. Exhaust stacks on scale models of flat-roof buildings were tested using fluorescent dye tracer illuminated by thin laser light sheets, with digital video images to measure dilution in the exhaust plume at roof level air intake locations. The results show that high stacks and exit velocities that represent good design on an emitting building can be less effective and are sometimes counterproductive in reducing contamination of the roof of a nearby adjacent building. The implications of the study for developing practical stack design guidelines are discussed in this paper.Units: Dual