本研究探討雙背吸式餐廳廚房排油煙櫃之靜態流場及櫃前有假人在高溫熱源作用時之空氣動力特性以及汙染物洩漏的程度。雙背吸式餐廳廚房排油煙櫃包含數個特徵結構：(1)靠近鍋子後緣的狹長型吸氣槽、(2)排油煙櫃後板上方兩個細長型輔助吸氣槽、(3)排油煙櫃上板中央偏前方的三角結構渦流產生器、(4)排油煙櫃上下左右入口的邊界層分離控制器。利用雷射輔助煙霧流場可視化技術，觀察排油煙機在不同吸氣速度與火力時之煙霧流動型態與洩漏特性。在排油煙櫃內部釋放追蹤氣體(SF6)，測量SF6在排油煙櫃開口面的局部洩漏濃度。流場可視化時，由於第(1)項設計，大部分煙霧被吸入下方吸氣槽，少部分因高溫浮力效應和紊流擾動而未被下方吸氣槽排出的煙霧上升至第(2)項結構附近，被上方吸氣槽吸走。當煙霧非常大時，第(2)項結構無法及時將上升的煙霧吸走，第(3)項結構藉著形成隔絕渦流，使得未被及時吸走的煙霧被阻隔於隔絕渦流，不易洩漏至外界。第(4)項結構使得櫃外空氣被吸入排油煙櫃時，在入口處不易產生有害的大渦漩。當瓦斯流量Qfuel = 2、6、10 SLPM (瓦斯加熱率q ̇fuel = 3.3 kW、9.9 kW、16.5 kW)，若吸氣槽吸氣速度Vs ≥ 12、14、17 m/s (面速度Vf ≥ 0.228、0.265、0.322 m/s，吸氣量Qs ≥ 18.43、21.5、26.11 m3/min)、靜態無假人，則完全無觀察到煙霧洩漏；若吸氣槽吸氣速度Vs ≥ 12、16、18 m/s (面速度Vf ≥ 0.228、0.303、0.341 m/s，吸氣量Qs ≥ 18.43、24.58、27.65 m3/min)、靜態有假人，則完全無觀察到煙霧洩漏。但是，若狹長型吸氣槽吸氣速度Vs小於以上所述的臨界值，則可觀察到煙霧由頂板前方洩漏至外界。SF6追蹤氣體濃度測試結果顯示：在所有火力條件下，當狹長型吸氣槽吸氣速度Vs大於臨界值時，在排油煙櫃開口面所測得的SF6時間平均洩漏濃度Cave ≤ 0.006 ppm，瞬間洩漏濃度Cinst ≤ 0.011 ppm，幾乎達到零洩漏的程度。

The flow properties and oil mist leakage characteristics of a Dual Backward Suction (DBS) commercial kitchen hood were studied experimentally. The DBS commercial kitchen hood consisted of four featured structures: (1) two primary suction slots near the rear rims of the pots, (2) two secondary suction slots at high level, (3) a vortex generator attached to the hood roof, (4) boundary-layer separation controllers (BSC) attached to the inlet of the hood. The laser-light sheet assisted smoke flow visualization technique was employed to examine the flow patterns. The results showed that there existed critical values of slot suction velocities beyond which the oil mist could be drawn into the primary and secondary suction slots at properly adjusted suction velocities for various flow rates of propane gas supplied to the ovens. For instance, the critical values of suction velocities were Vs = 12, 14, and 17 m/s for the propane fuel flow rate Qfuel = 2, 6, and 10 SLPM, respectively, for static situation without installing a manikin in front of the hood face. The critical values of suction velocities were Vs = 12, 16, and 18 m/s for the propane fuel flow rate Qfuel = 2, 6, and 10 SLPM, respectively, for static situation with a manikin standing in front of the hood face. The results of tracer-gas detection experiments revealed that the time-averaged and instantaneous leakage concentrations of SF6 were Cave ≤ 0.006 ppm and Cinst ≤ 0.011 ppm, respectively.

[1] American Conference of Governmental Industrial Hygienists, Industrial Ventilation - A Manual of Recommended Practice, 24th ed. American Conference of Governmental Industrial Hygienists, Kemper Meadow Drive, Cincinnati, America, 2001, pp. 108-109.
[2] 勞委會勞工安全衛生研究所，「作業場所空氣有害物預估與控制研究-側風對傳統型氣罩捕集效果之探討」，勞委會勞工安全衛生研究所研究報告，IOSH88-H103, 1999。
[3] 行政院勞工委員會，「有機溶劑中毒預防規則」，台北，台灣，2003。
[4] 行政院勞工委員會，「特定化學物質危害預防標準」，台北，台灣，2001。
[5] 內政部，「鉛中毒預防規則」，台北，台灣，2002。
[6] 內政部，「粉塵危害預防標準」，台北，台灣，2003。
[7] 行政院勞工委員會，「勞工安全衛生組織管理及自動檢查辦法」，台北，台灣，1993。
[8] Numano, Y. (沼野雄志)，「局排設計教室第三版」，中央勞動災害防止協會，東京，日本，1996。
[9] American Conference of Governmental Industrial Hygienists, Industrial Ventilation - A Manual of Recommended Practice, 21st ed. American Conference of Governmental Industrial Hygienists, Kemper Meadow Drive, Cincinnati, America, 1992.

[10] Li, Y., Delsante, D., and Symons, J., “Residential Kitchen Range Hoods - Capture Principle and Capture Efficiency Revisited,” Indoor Air, Vol. 7, No. 3, 1997, pp. 151-157.
[11] Lim, K. and Lee, C., “A Numerical Study on the Characteristics of Flow Field, Temperature and Concentration Distribution According to Changing the Shape of Separation Plate of Kitchen Hood System,” Energy and Buildings, Vol. 40, No. 2, 2008, pp. 175-184.
[12] 勞委會勞工安全衛生研究所，「作業場所空氣有害物預估與控制研究-側風對傳統型氣罩捕集效果之探討」，勞委會勞工安全衛生研究所研究報告，IOSH88-H103，台北，台灣，1999。
[13] 勞委會勞工安全衛生研究所，「傳統型氣罩控制風速與捕集能力探討」，勞委會勞工安全衛生研究所研究報告，IOSH89-H104， 2000。
[14] 勞委會勞工安全衛生研究所，「氣罩凸緣對捕集效果相關性探討」，勞委會勞工安全衛生研究所研究報告，IOSH90-H102，2001。
[15] 勞委會勞工安全衛生研究所，「發散式危害源氣罩設計模式研究」，勞委會勞工安全衛生研究所研究報告，IOSH91-H121，2002。
[16] 勞委會勞工安全衛生研究所，「吹吸式氣罩設計與操作指引研究」，勞委會勞工安全衛生研究所研究報告，IOSH92-H102，2003。
[17] Huang, R. F., Chen, J. L., Chen, Y. K., Chen, C. C., Yeh, W. Y., and Chen, C. W., “The Capture Envelope of a Flanged Circular Hood in Cross Drafts,” AIHA Journal, Vol. 62, No. 2, 2001, pp. 199-207.

[18] Huang, R. F., Sir, S. Y., Chen, Y. K., Yeh, W. Y., Chen, C. W., and Chen, C. C., “Capture Envelopes of Rectangular Hoods in Cross Drafts,” AIHA Journal, Vol. 62, No. 10, 2001, pp. 563-572.
[19] Huang, R. F., Liu, G. S., Chen, Y. K., Yeh, W. Y., Chen, C. W., and Chen, C. C., “Effects of Flange Size on Dividing Streamline of Exterior Hoods in Cross Drafts,” Journal of Occupational and Environmental Hygiene, Vol. 1, No. 5, 2004, pp. 283-288.
[20] Huang, R. F., Liu, G. S., Lin, S. Y., Chen, Y. K., Wang, S. C., Peng, C. Y., Yeh, W. Y., Chen, C. W., and Chang, C. P., “Development and Characterization of a Wake-Controlled Exterior Hood,” Journal of Occupational and Environmental Hygiene, Vol. 1, No. 12, 2004, pp. 769-778.
[21] 行政院勞工委員會，「有機溶劑中毒預防規則」，台北，台灣，2003。
[22] 行政院勞工委員會，「特定化學物質危害預防標準」，台北，台灣，2001。
[23] 內政部，「鉛中毒預防規則」，台北，台灣，2002。
[24] 內政部，「粉塵危害預防標準」，台北，台灣，2003。
[25] EPA, Guidelines for Determining Capture Efficiency, U.S. Environmental Protection Agency, Candace Sorrell, 1995.
[26] Huebener, D. J. and Hughes, R. T., “Development of Push-Pull Ventilation,” AIHA J., Vol. 46, No. 5, 1985, pp. 262-267.
[27] Klein, M. K., “A Demonstration of NIOSH Push-Pull Ventilation Criteria,” AIHA J., Vol. 48, No. 3, 1988, pp. 238-246.

[28] Siebert, G. W. and Fraser, D. A., “Exhaust Ventilation for Hot Processes,” AIHA J., Vol. 34, No. 11, 1973, pp. 481-486.
[29] American Society of Heating, Refrigerating and Air Conditioning Engineers, ASHRAE Handbook - HVAC Application, American Society of Heating, Refrigerating and Air Conditioning Engineers, Atlanta, GA, America, 2011, pp. 33.1-33.33.
[30] 盧智芬，「油煙氣膠粒徑分佈與吸濕現象之研究」，國立台灣大學環境工程研究所碩士論文，台北，台灣，2001。
[31] Flagan, R. C. and Seinfeld J. H., Fundamentals of Air Pollution Engineering, Prentice Hall, Englewood Cliffs, New Jersey, 1988, pp. 295-307.