具挑高中庭建築物浮力通風之實驗研究;Experimental Study of Buoyancy-driven Ventilation in Buildings with Atrium

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Title:	具挑高中庭建築物浮力通風之實驗研究;Experimental Study of Buoyancy-driven Ventilation in Buildings with Atrium
Authors:	蔡仁凱;Tsai, Ren-Kai
Contributors:	土木工程學系
Keywords:	挑高建築物;浮力通風;風洞實驗;示踪劑法;通風井;Atrium;Natural ventilation;Wind tunnel experiment;Tracer gas technique
Date:	2018-07-23
Issue Date:	2018-08-31 11:23:59 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究利用風洞模型實驗和示蹤劑濃度衰減法來研究具有挑高中庭建築物的自然通風，研究參數包括風速、風向角、建築物外牆開口面積和屋突對通風量的影響。實驗結果顯示：建築物的通風量與室外風速、頂蓋的開口面積成正比，建築物開口面積愈大，通風量愈大。且建築物僅只有單一開口，其通風量小於有雙開口建築物之通風量。雙開口之建築物，側牆開口在迎風面的通風量又大於在背風面側牆之通風量。當阿基米德數Ar < 1時、風力通風的效應大於熱浮力，反之Ar > 1，熱浮力通風的效應方能顯現。而浮力通風狀況下，屋突的形式不會影響通風量，但在合併通風狀況下，挑空中庭之頂蓋有百頁窗時，會降低建築物的通風量。本研究並利用理論分析建立一個計算通風量之物理模式，此模式可適用風壓、熱浮力合併作用下的自然通風，研究成果可作為建築物設計通風之參考。;This study used wind tunnel experiments and tracer gas technique to investigate the natural ventilation of buildings with atrium. The study parameters included wind speed, wind direction, opening area, and different roofings on the atrium. The experimental results revealed that the wind-driven ventilation rate is proportional to the external wind speed and the opening area, and the louver on the roofing could lessen the ventilation rate. This study also developed a physical model to estimate the ventilation rates of wind- and buoyancy-driven ventilation. When Archimedes number larger than 1, the ventilation rate was mainly dominated by wind-driven ventilation. The results of this study can be used to improve the natural ventilation of buildings with atrium.
Appears in Collections:	[Graduate Institute of Civil Engineering] Electronic Thesis & Dissertation

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