臺灣博碩士論文加值系統

工廠作業過程中會汙染環境的高濃度污染物，通常都會以飛散或擴散的方式逐漸密布工廠內，最後汙染整個作業場所，因此在污染源尚未混合分散於一般空氣之中，將其捕捉並潔淨排除於室外，局部排氣系統之設計相對重要。本文內容針對廠房內熱煙及廢氣排放不良之情況進行探討且設計一套系統來改善，可在較少的能源消耗情形下，達到將汙染氣體排放的效果。
理想的局部排氣系統之進氣口處通常有一個或數個氣罩來提升氣體捕捉能力，內文中也詳加敘述氣罩其張角之展旋比的變化與改善情形，在固定相同之主管徑的情形下將三種不同角度40度、60度、80度在喉部所產生之不同壓力值與流速來比較，觀察其氣罩之不同吸氣效果之差異性，根據文獻所示氣罩之理想夾角約為40~60度，本文以COMSOL MULTIPHYSICS有限元素分析模擬與實驗相互驗證其準確性找出適當的系統設計，而後在主管徑的變化上也會造成壓力不同的變化，實驗與模擬之數據上的比較，最後附上產學合作案之工廠實例。

關鍵字:通風、局部排氣、氣罩

Plant operations process will pollute the environment of high concentrations of pollutants, often with scattered clouds gradually or spread of the plant, and finally contaminate the entire workplace, and therefore pollution has not been mixed and dispersed in the general air, clean their catch and exclusion outdoor design relative importance of local exhaust systems. In this paper, the smoke and heat content of the plant's emissions of harmful exhaust gases to explore and design for a system to improve that situation in less energy consumption and pollution emissions to achieve the effect.
Into the outlet ideal local exhaust systems usually have one or hood to improve gas capture capability, the article also describes in detail the hood than its exhibition opening angle of rotation changes and improve the situation, at a fixed charge of the same diameter the three different situations under an angle of 40 degrees, 60 degrees, 80 degrees and in different pressure values generated by the flow rate at the throat to compare observed differences between different suction effect of the hood, the hood according to the ideal as shown in the literature angle of about 40 to 60 degrees, this paper COMSOL MULTIPHYSICS finite element analysis simulation and experimental verification of its accuracy to identify mutual proper system design, then the change in the diameter of the head of pressure can also cause different changes, experimental and simulated data comparison on the final text of industry-university cooperation attach factory instance.



Keywords: ventilation、local exhaust、hood

摘要 iii
Abstract iv
誌 謝 iv
圖目錄 viii
表目錄 xii
符號表 xiii
第一章、緒論 1
1.1研究背景與動機 1
1.2 文獻回顧 3
1.2.1氣罩之張角變化 3
1.2.2 主管之管徑變化 3
第二章、舊有熱氣排放系統量測與模擬分析 5
2.1研究目的 5
2.2既有熱氣排放系統量測與模擬分析 5
2.2.1既有系統量測結果 5
2.3.舊有系統模擬分析 11
2.3.1模擬方法 11
2.3.2結果與討論 12
2.4舊有系統問題分析 16
第三章、氣罩設計與系統改善 17
3.1設計目的 17
3.2理論估算與氣罩設計 18
3.2.1 理論估算 18
3.2.2適當的氣罩設計與尺寸計算 22
3.3模擬方法與實驗驗證 26
3.3.1 模擬方法 26
3.3.2 網格獨立性 27
3.4實驗模型建構 29
3.4.1實驗設計 29
3.4.2實驗量測方法 31
3.4.3模擬設定 33
3.4.4模擬與實驗數據比較 33
3.5實際現場系統設計與評估 37
3.5.1模擬與分析結果 39
模擬與設計目的 39
3.6結果與討論 58
3.7應用於系統配置設計 60
3.7.1實既配置模型建立與模型 60
3.8結論 70
第四章 新系統之現場測試與比較 71
4.1 新系統之現場狀況與比較 71
第五章 結論 74
參考文獻 76

[1] 王洪鎧，工業通風設計基礎 徐式基金會，1990。
[2] 鍾基強，工業通風設計概要 ，2003。
[3] F.Cascetta and L.BeNia, Experimental Evaluation of the Velocity Fields for Local Exhaust Hoods with Circular and Rectangular Openings, Buildmg and Environmenr Vol.31,No.5,pp.437-9,1996
[4] F.Cascetta, Velocity Fields in Proximity of Local Exhaust Hood Openings: an Intercomparison between Current Recommended Formulas and Experimental Studies, Buildmg and Environmenr Vol.31,No.5,pp.451-459,1996
[5] Shun-Chih Wang, Chen-Pang Chiu, Kuei-Yi Lin Comparison of Schlieren Photography and Numerical Simulation on Performance Evaluation of a Flanged Exhaust Hood, July, 2009
[6] F.Cascetta, F.M.Rosano, Assessment of velocity Fields in the vicinity of rectangular exhaust hood openings, Building and Environment 36 (2001) 1137–1141
[7] Vittorio Betta, Furio Cascetta, Pierluigi Labruna, Adolfo Palombo,Anumerical approach for air velocity predictions in front of exhaust flanged slot openings, Building and Environment 39 (2004) 9 – 18
[8] 朱佳仁, 邱英浩, 陳彥志, 王宇文, 建築物開口對風壓通風影響之研究, 中華民國建築學會「建築學報」第69期，p17-33，2009
[9] Feng-Chin Tsaia,Ren-Horn Hsiehb,Oblique effects on the capture ability of a hood under crosswind environments — numerical method,Building and Environment 41 (2006) 1471–1477