由於都市快速發展形成擁擠的居住模式,因此產生自然通風不良的建築形式,為了維持相同的室內舒適度,人類過度仰賴機械設備帶來的便利,隨之而來的環境問題,竟逐漸地威脅到眾人的生活;為此,研究學者指出有效的自然通風設計,才是符合永續的室內換氣方式。 早期的台灣建築中,便可看見通風塔應用於改善自然通風不良的設計,此外,台灣天生擁有長時間日照的優勢,充足的日射量可增進室內的熱浮力作用,此優勢可有效提升通風塔的通風性能。 本研究利用足尺實驗量測環境物理參數,做為CFD數值模擬的設定依據,進而利用變數設定(出風口面積、導光管直徑、導光通風塔高度、室外風速與室內發熱量五項)分析不同導光通風塔形式之通風性能。 研究結果指出,於室外風速對室內自然通風影響較大的狀態下,導光通風塔可獲得較高的通風性能,因此導光管所提升的浮力通風行為,相較之下影響較小,導致運用增長導光管直徑的方式促進室內自然通風的發生,成效反而不及利用增高導光通風塔高度的方式。
Remarkable advance have been made in city which transforms the high density of residential areas. That forms the building types to high-raised or dense cluster styles. Hence, the mechanical systems are largely used in order to maintain or create safe and comfortable conditions. The disadvantage due to the large lean of mechanical system brings carrying capacity of environment. Some studies present that natural ventilation is one of useful strategies provided that the air change rate is satisfactory. According to some successful projects in Taiwan, the vertical ventilation duct is confirmed as an important strategy. Besides, Taiwan has another advantage for the long period sunbeam. That can be used to raise natural ventilation if the buoyancy effect can be increased by the high solar radiation. Hence, the study addresses the possible for the application of lighting-ventilation stack. The study first uses the full-scale experiment for ventilation study. According to the experimental result was set up in CFD. To probe into parameter study (include: the open of vent 、height of stack、diameter of pipe、outdoor velocity and indoor heat-flux) in CFD, the ventilation performance for the lighting-ventilation stacks of diverse style can be known. This study points out that wind for ventilation performance is good more than buoyancy. Therefore, employing to increase the height of stack is better than the diameter of pipe.