氣簾式氣櫃在一些物理參數(即雙重櫃門往下吹之風速以及氣櫃前方吸氣槽之吸氣風速)與幾何參數配合妥當時，可獲得氣櫃內無迴流且氣櫃內含物不易逸散至櫃外之良好性能，但是在高溫作業時，內含物之逸散狀況則尚未有過探討。本實驗庚續過去之研究，進行高溫作業時氣簾式氣櫃之洩漏評估。當氣櫃內有熱源在操作時，若氣櫃之操作條件不變，高溫所引致之浮力效應、排放之蒸汽或煙霧，有可能造成櫃內污染物從氣櫃頂部以及櫃門開口處外洩。另外，熱源所造成的向上氣流會牴觸被往下吸之補氣氣流之流場形態，使氣流延伸至櫃外，導致污染源外洩的情形更為嚴重。故需透過流體力學方法以及雷射流場可視化的技術，觀察高溫所引致之浮力效應、排放之蒸汽或煙霧在櫃內之行為，並檢視是否有逆流、渦流、氣流擾動等。根據流場實驗之結果，尋找最適當的操作設計參數組合與策略。然後部份模擬EN 14175追蹤氣體動態濃度測試方法，探討高溫作業時，在不同操作參數下，追蹤氣體受到walk-by干擾時之洩漏濃度，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之有效性。研究結果顯示，在進行高溫作業時，氣簾式氣櫃之操作參數與策略會影響流場型態與洩漏量。適當調整操作參數與策略可以克服300 oC熱源的影響，以保障氣櫃操作人員之健康。

The air-curtain isolated chemical fume hood was successfully developed in previous research. By appropriately adjusting the physical parameters (e.g., suction velocity from the suction slot, blow-down velocity from the double-layered sash) and geometric designs, the air-curtain fume hood has been approved as an “almost zero-leakage” apparatus. However, previous research did not show the performance and optimized operation parameters as a high-temperature pollutant source was generated in the hood. No answers to the leakages from the hood top and the sash opening were obtained. The aim of the present work is focused on studying the effects of the high temperature plume on the flow field and the leakage of tracer gas from the sash opening under the high temperature operation situation. Flow visualization and velocimeter measurement were firstly performed to obtain the flow characteristics. By using the observed flow characteristics, the optimized operation parameters and strategy for high-temperature operation were suggested. The tracer-gas concentration tests partially simulating EN 14175-3:2003 protocal for the walk-by motions were subsequently conducted to obtain the quantitative leakage data and also to validate the optimized operation parameters and strategy. The results show that the air-curtain hood presents excellent performance even under high-temperature operation at 300 oC if operation parameters are properly adjusted.

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