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題 名 | 以計算流體動力學研析自然通風空間空氣交換有效性與氣狀污染物排除效率=CFD Investigation on Air Change Effectiveness and Gaseous Pollutant Removal Efficiency in a Naturally Ventilated Space |
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作 者 | 張倉榮; 游家信; | 書刊名 | 農業工程學報 |
卷 期 | 48:3 2002.09[民91.09] |
頁 次 | 頁51-62 |
分類號 | 441.64 |
關鍵詞 | 室內空氣品質; 自然通風; 紊流大渦模擬; 空氣交換有效性; 污染物排除效率; Indoor air quality; Natural ventilation; LES; Air change effectiveness; Gaseous pollutant removal efficiency; |
語 文 | 中文(Chinese) |
中文摘要 | 由於現代人從事室內活動時間的增加,使得室內空氣品質問題在近年來逐漸受到重視。由能源的節約及維護健康的觀點出發,應盡量減少對機械通風的依賴,並改用綠建築自然通風的手段使室內空氣得以交換,以幫助室內污染物之排除與稀釋,改善室內空氣品質。本研究以紊流大渦模擬(LES)模式配合Navier-Stokes控制方程式以及氣狀污染物擴散對流方程式,進行CFD(計算流體動力學)數值模式的研究發展,並針對四種常見的建築物自然通風策略案例進行數值模擬測定,在得到各案例之速度場及濃度場後,藉空氣交換率(air change rate)及污染物排除效率因子(contaminant removal effectiveness)等參數的分析,比較各案例因開窗策略不同,而產生空氣交換有效性以及室內污染排除效率的差異,藉以研擬出理想的通風策略,改善室內空氣品質,並提供日後建築物通風設計之參考依據。模擬結果顯示,使用平行雙對流(parallel co-flow)通風案例在空氣交換及污染物的排除均有最好的表現,而採背風面單側(leeward sided)通風的案例則表現最差。另外,迎風面邊窗的開啟與否,對通風空間之空氣交換效率影響最大,而背風面邊窗的開啟則最有助於室內污染質之排除。 |
英文摘要 | In resent years, much attention has been paid to indoor air quality. For the purpose of improving indoor air quality, it is desirable to use natural ventilation from the viewpoint of green building. The present research uses the computational fluid dynamics (CFD) technique to solve the Navier-Stokes equations and atmospheric convection diffusion equation together with the large eddy simulation (LES) turbulence model. A series of numerical simulations on four types of natural ventilation strategy are carried out. The air change effectiveness and gaseous pollutant removal efficiency have been emphasized. The parameters such as the air change rate and the contaminant removal effectiveness are used to evaluate the ventilation performance for each strategy. The simulation result shows that ventilation strategy like parallel co-flow has the greatest ventilation efficiency, and the worst is the case of leeward-sided ventilation. The openness of windward side vent has apparent effect on ventilation performance, whereas the leeward side vent is important for pollutant removal efficiency. |
本系統中英文摘要資訊取自各篇刊載內容。