本研究以流體力學的觀點，發展一套全新的斜氣簾式化學排氣櫃設計，大幅改善傳統型氣櫃的缺點，並探討此排氣櫃的空氣動力特性與汙染物洩漏評估。斜氣簾式排氣櫃依照操作用途及環境的優劣，可分為高位準、高效能及泛用型三種氣櫃。斜氣簾式氣櫃是在櫃底工作面的前方加上一道上吹二維噴流，並在左右側牆內安裝一片直立的長形導流板，配合狹縫形上吸式氣罩，使櫃內形成一道傾斜的空氣簾幕。透過上吹二維噴流的吹氣速度、吸氣罩的吹氣速度與幾何參數的配合，可將汙染物有效控制在氣櫃內部。採用流場可視化技術探討櫃內的氣流特性，並以追蹤氣體濃度偵測法評估氣櫃的洩漏。流場可視化實驗的結果顯示，吸氣速度越大，氣簾的傾斜度越大；氣簾傾斜度越大，煙霧包覆於櫃內的情況越好。根據流場可視化的實驗結果，尋找出適當的設計參數與操作策略。使用EN14175-3:2003追蹤氣體測試法，在不同的操作參數設定下，紀錄氣櫃內所釋放的SF6濃度洩漏情形，並藉此驗證經由流場可視化實驗結果所擬定之操作條件與策略的有效性。EN14175-3:2003追蹤氣體測試的結果顯示，高效能斜氣簾式氣櫃在穩態時，平均洩漏濃度為0.001 ppm (傳統型氣櫃之最大平均洩漏濃度為30.534 ppm)；動態強健度測試結果，高效能斜氣簾式氣櫃的最佳平均洩漏濃度為0.003 ppm (傳統型氣櫃之平均洩漏濃度為1.23 ppm)，由數據顯示，斜氣簾式排氣櫃的性能遠遠優於傳統型排氣櫃。以能源消耗觀點來看，高效能及泛用型氣櫃相較於傳統型氣櫃可節省能源分別為60%與47%。

An innovative chemical fume hood which operates based on the aerodynamic principle of inclined air-curtain isolation was developed. Depending on the local operating conditions, the inclined air-curtain fume hoods were classified into three different types, namely: high position, high efficiency, and general purpose hoods. The inclined air-curtain fume hood employed in the present work was constructed with the cross-flow fan at the bottom, deflection plate along the side walls, and a suction slot at the top of the cabinet. The containments in the cabinet were controlled effectively by using the two-dimension blow velocity (Vb) and suction velocity (Vs). Flow visualization and tracer-gas methods were performed to diagnose the flow characteristics and containment performance. The flow visualization results showed that the shape of the inclined air-curtain was affected by the suction velocity. The optimal operating conditions based on the containment characteristics was achieved when the air curtain was more inclined to the contaminants. By employing the EN 14175-3:2003 standard methods to test the performance of the inclined air curtain fume hood, the optimized operation parameters were validated. The detected leakages of high efficiency fume hood for steady and walk-by tests were only 0.001 ppm and 0.003 ppm, respectively. These results attained from high efficiency inclined air-curtain fume hood tests were much lower than the conventional fume hood which steady and walk-by leakages are recorded at 30.534 ppm and 1.23 ppm, respectively. The total flow rate of high efficiency and general purpose hood were about 60 % and 47 % less than the conventional fume hood, respectively.

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