摘 要
本研究以流體力學的觀點，針對傳統型與氣簾式排油煙機的流場與性能作實驗分析，探討排油煙機在受到氣流衝擊以及裝設在不同高度時的補集性能與洩漏情況。使用雷射煙霧流場可視化法觀察參數變化對氣簾模態的影響，進行流場診測研究，推測造成污染物洩漏的原因，並尋求可能的理想操作條件。另以追蹤氣體(SF6)濃度偵測方式來評估排油煙機在不同高度下污染物洩漏的情形。實驗結果顯示，排油煙機需要在操作環境側風速度低於0.3 m/s時才會有較佳的補集效率，氣簾式排油煙機對於正面的氣流衝擊防護能力相當優異，而傳統型及噴流阻絕型排油煙機則對於側面的氣流衝擊有較佳的防禦能力。在不同高度的局部濃度測試實驗中發現氣簾式排油煙機在高度H = 55 cm時，排油煙機需往後牆偏移5 cm，且搭配吹氣角度20o，會有非常好的補集性能；而安裝高度高於60 cm後，則需將排油煙機置於爐檯正上方，搭配吹氣角度15o，能有較佳的防禦能力。當操作條件及高度相同時，氣簾式排油煙機的補集能力明顯優於傳統式及噴流阻絕型排油煙機。氣簾式排油煙機吸氣流量為10.92 CMM(壓損為201.4 Pa)，就能達到很好的捕集性能及抗側風能力。相較於傳統式排油煙機15 CMM(壓損為334.5 Pa)的排氣量，能源節省56.2%，且抗洩漏的能力大為增強。

Abstract
A study on experimental analysis of conventional and air-curtain range hoods was performed to unveil the spillage characteristics and capature efficiency of the hoods. Two parameters were examined—influences of the convective draft and the installation height of the hood. Behaviors of air curtains and hot oil smokes were inspected by using the laser-light sheet assisted smoke-flow visualization method. The effect of local contaminant leakages were quantified by measuring the concentration of SF6 tracer-gas. According to the experimental results, all tested range hoods presented better operation performance as the convective draft velocity was less than 0.3 m/s. Air-curtain range hoods attained high protective ability for the front-face convective draft. Conventional exterior hoods oppositely get better in the side part. An optimum operating condition has been discovered during the static and dynamic tests for different heights. Air-curtain range hoods should shift 5 cm toward the rear wall. However the hoods had better to install on top of the pot (no offset) when the height was higher than 60 cm. It was also found out from this research that when the suction velocity was Vs = 13 m/s (flow rate Qs = 10.92 CMM), the air-curtain range hood attained high containment efficiency. This hood consumed 56.2% less energy compared with the conventional exterior hood (flow rate Q = 15 CMM).

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