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題名 | 通風空間中室內氣懸街塵移除之動態模擬=Removal Dynamics of Indoor Airborne Road Dust in a Ventilated Airspace |
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作者姓名(中文) | 黃美玉; 廖中明; 張倉榮; | 書刊名 | 農業工程學報 |
卷期 | 51:4 民94.12 |
頁次 | 頁1-19 |
分類號 | 445.63 |
關鍵詞 | 街塵; 通風; 紊流膠結; 紊流擴散附著; 重力沉降; Road dust; Ventilation; Turbulent coagulation; Turbulent diffusive deposition; Gravitational sedimentation; |
語文 | 中文(Chinese) |
中文摘要 | 本研究將通風空間內部視為完全混點,推導通風空間中室內氣懸街塵移除機制之動態方程式,其中考慮紊流膠結(turbulent coagulation)、產流擴散附著(turbulent diffusive deposition)、重力沉降(gravitation al sedimentation)及氣流型態等作用,描述室內氣懸街塵之移資動態行為。以臺灣北部都市地區之街塵為對象,運用室內氣懸街塵移除動態方程式模擬六組空間系統,其中四組採位移式系統(displacement system)和二組採短循環式系統(short-circuiting system),並以兩種通風量(210及105□□,空氣交換率為1.04及0.52□)及兩種微粒產生量(0.1及0.05g□)進行模擬。 模擬結果顯示臺灣北部都市地區(古亭測站),氣懸街塵街塵對數常態分布幾何平均粒徑為1.01μm,及幾何標準偏差為2.59。當通風量為210及105□□,微粒產生量為0.1及0.05g□時,位移式及短循環式通風系統之累積氣懸街塵濃度範分別為64.28~237.38及94.72~356.00μg□。對應比較得知位移之累積氣懸街塵濃度較短循環式通風系統低,因此位移式較短循環式通風系統能有效移除氣懸街塵。 本研究同時進行模式靈敏度分析,當氣動直徑為1.01μm時,考慮三種通風量分別為105、210及315□□(空氣交換率為0.52、1..04及1.56□),對模式參數進行靈敏度分析,分析結果顯示通風量為影響最鉅之參數。當通風量為105、210及315□□時,皆顯示紊亂膠結對移除影響較大,紊流擴散附著及重力沉降則次之。本研究結果,期能對都會住宅室內空間之環境設計有所貢獻。 |
英文摘要 | The main purpose of this research is to derive a dynamic equation for describing the removal mechanisms of airborne road dust from a ventilated airspace. This proposed dynamic equation simultaneously takes into account the removal effects of three dimensionless parameters, turbulent coagulation (TC), turbulent diffusive deposition (TD), gravitational sedimentation (GS), and airflow pattern with in a ventilated airspace. One set of road dust collected from urban area situated in northern Taiwan. Four displacement associated with two short-circuiting ventilation system modes were conducted in the modeling simulation. Two airflow rates (210 and 105 □□,ACH=1.04 and 0.52□) with two road dust generation rates (0.1 and 0.05g □) were employed to perform the modeling simulation of the mass concentration of airborne road dose. Results show that there is no significant variation for particle size distributions of the road dust samples obtained from urban area in northern Taiwan. Whereas both bellowed a lognormal distribution with average geometric mean diameter of 1.01μm and geometric standard deviation of 2.59. Sensitivity analysis of model parameters reveals that airflow is the dominant parameter in the model. Sensitivity analysis shows that TC is the dominant parameter among TC, TD and GS as the airflow rate is 105, 210 and 315□□ (ACH=0.52、1.04 and 1.56□). The results of modeling simulation also demonstrate that cumulative mass concentrations of airborne road dust in displacement and short-circuiting ventilation systems are 64.28~237.38 and 94.72~356.00 μg□, respectively, under airflow rate of 210 and 105□□ with road dust generation rate of 0.1 and 0.05 g□, indications cumulative mass concentration in displacement system is lower than that in short-circuiting system. Moreover, the cumulative mass concentrations under airflow rate of 210□□ are lower than that under 105□□, in both displacement and short-circuiting ventilation systems. Results also demonstrate that the removal efficiency of displacement ventilation system i9s higher than that of short-circuiting one. Results obtained from this research are expected to offer designers a control strategy for removal of indoor concentrations of airborne road dust from a ventilated airspace. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。