College of Mechanical Engineering, Shanghai University of Engineering Science, Shanghai, 201620, China.
School of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China.
Environ Sci Pollut Res Int. 2017 Oct;24(30):23620-23635. doi: 10.1007/s11356-017-9934-0. Epub 2017 Aug 30.
Numerical simulations were conducted to investigate the effects of building height ratio (i.e., HR, the height ratio of the upstream building to the downstream building) on the air quality in buildings beside street canyons, and both regular and staggered canyons were considered for the simulations. The results show that the building height ratio affects not only the ventilation fluxes of the rooms in the downstream building but also the pollutant concentrations around the building. The parameter, outdoor effective source intensity of a room, is then proposed to calculate the amount of vehicular pollutants that enters into building rooms. Smaller value of this parameter indicates less pollutant enters the room. The numerical results reveal that HRs from 2/7 to 7/2 are the favorable height ratios for the regular canyons, as they obtain smaller values than the other cases. While HR values of 5/7, 7/7, and 7/5 are appropriate for staggered canyons. In addition, in terms of improving indoor air quality by natural ventilation, the staggered canyons with favorable HR are better than those of the regular canyons.
进行了数值模拟，以研究建筑物高度比（即 HR，上游建筑物与下游建筑物的高度比）对街道峡谷旁建筑物空气质量的影响，模拟考虑了规则峡谷和交错峡谷。结果表明，建筑物高度比不仅影响下游建筑物房间的通风通量，还影响建筑物周围的污染物浓度。然后提出了室外有效源强度参数来计算进入建筑物房间的车辆污染物量。该参数值越小，表示进入房间的污染物越少。数值结果表明，对于规则峡谷，2/7 至 7/2 的 HR 是有利的高度比，因为它们的值小于其他情况。而对于交错峡谷，HR 值为 5/7、7/7 和 7/5 是合适的。此外，就通过自然通风改善室内空气质量而言，具有有利 HR 的交错峡谷优于规则峡谷。
