کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6576837 1422838 2018 22 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The impact of semi-open settings on ventilation in idealized building arrays
ترجمه فارسی عنوان
تأثیر تنظیمات نیمه باز بر تهویه در آرایه های ساختمان ایده آل
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
چکیده انگلیسی
Semi-open settings (or hanged walls) above the pedestrian level in street canyons can provide protection to pedestrians from heavy-rain and strong sunshine, but may also influence street ventilation and thus pollutant dispersion. By performing computational fluid dynamics (CFD) simulations and employing ventilation concepts of net escape velocity (i.e. diluting rate for exhale effect) and the age of air (i.e. freshness of air for inhale effect), this paper investigates the effects of low-level semi-open settings on ventilation in idealized block arrays with rectangular or square form (building height/street width H/W = 1.25) under neutral atmospheric conditions. Four upstream wind directions of 0° (parallel), 15°, 30°, 45° between the approaching wind and the main street axis and four widths of semi-open settings (Ws = 0 m, 2 m, 4 m, 6 m) are investigated. Results indicate that the increasing width of semi-open settings produce greater age of air (i.e. older air) and smaller net escape velocity (i.e. less diluting rate) than those without semi-open settings. The wider semi-open settings experience the worst ventilation. In addition, the approaching wind directions of 0° and 15° lead to worse ventilation than 30° and 45°, for both rectangular and square forms.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Urban Climate - Volume 25, September 2018, Pages 196-217
نویسندگان
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