四渦流排油煙櫃係用以改善傳統商用排油煙設備缺點的新設備，本研究探討評估一套全新的四渦流排油煙櫃之空氣動力特性以及污染物洩漏的程度。利用箱型式氣罩特性，降低因側風影響而萎縮的捕集區範圍；使用狹長型吸氣槽以增加有效吸氣距離；使用圓弧流線型的開口設計以減緩汙染物在開口邊緣回流的程度；使用導流板配合狹長型吸氣槽以及圓弧流線型開口設計，進一步消彌油煙逆回滯留於開口邊緣的問題，並產生穩定後傾的四渦漩流場，使流場更加穩健。採用流場可視化技術探討櫃內氣流的流動特性，並以追蹤氣體濃度偵測法評估四渦流排油煙櫃的洩漏程度。無導流板之四渦流排油煙櫃會使油煙較集中於油鍋上方，不易往兩側擴散，造成油煙蔓延在兩油鍋上方頂板開口邊緣。因此在真人動態測試及強健度測試距離較近時，吸氣速度即使達到 10 m/s，仍無法避免油煙向人員擴散與污染物散逸至大氣等問題(強健度測試< 0.170 ppm)。提高吸氣速度雖能降低洩漏量，但徒增能源消耗。有導流板之四渦流排油煙櫃在大約8 m/s的吸氣速度時，靜態測試已能達到極低的洩漏量(< 0.002 ppm)。在吸氣速度12 m/s時，動態測試的洩漏濃度平均值最大僅為0.002 ppm，與靜態測試8 m/s吸氣速度時的水準相似。無論是靜態測試或動態測試，有導流板之四渦流排油煙櫃均能在較低的吸氣速度下達到比無導流板更好的防護效果。傳統商用排油煙設備之面速度要介於0.5~1.0 m/s，才會有稍好的捕集效率，頗為浪費能源而且油煙仍舊洩漏。四渦流排油煙櫃之面速度僅需0.18 m/s (吸氣速度10 m/s)，在靜態的捕集性能或動態強健度測試即可達到優異表現(靜態洩漏< 0.002 ppm；強健度測試< 0.025 ppm)，而且能夠達到節省能源的目的。

The quad-vortex commercial kitchen hood was an innovative equipment in order to circumvent the drawbacks (large suction flow rate and high containment leakage level) of the conventional commercial kitchen hood. It was designed and developed based on the aerodynamic principle of inclined quad-vortex flow. By arranging a specially designed suction slot on the rear portion of the hood ceiling as well as two deflection plates obliquely attached to the inner side walls of the hood, a stable quad-vortex flow field was established. The quad-vortex flow went up toward the suction slot and was inclined toward the rear wall at high attitudes since the suction slot was arranged on the rear portion of the hood ceiling. Due to the features of quad-vortex flow, the high temperature containments generated in the hood was safely contained and expelled. Laser-light sheet-assisted smoke flow visualization was employed to qualitatively diagnose the flow patterns. The tracer-gas (SF6) concentration detection method was applied to measure the quantitative leakage levels. The results of flow visualization revealed that at the suction velocity lower than about 10 m/s (face velocity 0.18 m/s) the containment generated in the hood was restricted by the quad-vortex flow and followed the backward-inclined stable quad-vortex flow to get expelled through the suction slot. The results of tracer-gas concentration detections presented that at the suction velocity 10 m/s (face velocity 0.18 m/s) the leakage level can be lower than 0.002 ppm for static test and 0.025 ppm for walk-by test. The optimized face velocity of the existing conventional commercial kitchen hood was 0.5 ~ 1.0 m/s according to the recommendation of EPB of Taiwan. The quad-vortex hood obviously required much less suction flow rate than the conventional one.

[1] Ko, Y.C., cheng, L.S., Lee, C.H., Huang, J.J., Huang,M.S., Kao, E.L., Wang, H.Z., Lin, H.J. , “Chinese FoodCooking and Lung Cancer in Women Nonsmokers,” Am.J. Epidemiol, Vol. 151, 2000, pp.140-147.
[2] ACGIH, Industrial Ventilation, A manual of recommended practice, 24th ed. American Conference of Governmental Industrial Hygienists, 2001, pp. 108-109.。
[3] Tseng, L. C., Huang, R. F., Chen, C. C., and Chang, C. P., “Correlation between airflow patterns and performance of a laboratory fume hood,” Journal of Occupational and Environmental Hygiene, Vol. 3, No. 12, 2006, pp. 694-706.
[4] 行政院勞工委員會，有機溶劑中毒預防規則，台北，1991。
[5] 行政院勞工委員會，特定化學物質危害預防標準，台北，1991。
[6] 內政部，鉛中毒預防規則，台北，1974。
[7] 內政部，粉塵危害預防標準，台北，1981。
[8] 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，1993。
[9] 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，東京，1996。
[10] Industrial Ventilation, a Manual of Recommended Practice, 21st ed. American Conference of Governmental Industrial Hygienists, 1992.
[11] Li, Y., Delsante, D., and Symons, J., “Residential Kitchen Range Hoods - Buoyancy - Capyure Principle and Capture Ffficiency Revisited,” Indoor Air, Vol. 7, No. 3, 1997, pp. 151-157.
[12] 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.
[13] 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-側風對外裝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。
[14] 勞委會勞工安全衛生研究所，外裝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。
[15] 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。
[16] 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。
[17] 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。
[18] 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.
[19] 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.
[20] 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.
[21] 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.
[22] 行政院勞工委員會，有機溶劑中毒預防規則，台北，2003。
[23] 行政院勞工委員會，特定化學物質危害預防標準，行政院勞工委員會，台北，2001。
[24] 行政院勞工委員會，鉛中毒預防規則，行政院勞工委員會，台北，2002。
[25] 行政院勞工委員會，粉塵危害預防標準，行政院勞工委員會，台北，2003。
[26] Guidelines for Determining Capture Efficiency, 1995, U. S. Environmental Protection Agency.
[27] Huebener, D. J. and Hughes, R. T., “Development of push-pull ventilation,” AIHA J., Vol. 46, No. 5, 1985, pp. 262-267.
[28] Klein, M. K., “A demonstration of NIOSH push-pull ventilation criteria,” AIHA J., Vol. 48, No. 3, 1988, pp. 238-246.
[29] 王順志、李水源，以圍線氣簾強化接收型氣罩性能探討，D-13，2005年工業衛生暨環境職業醫學學術研討會，台南縣，2005年04月29-30日。
[30] Siebert, G. W. and Fraser, D. A., “Exhaust Ventilation for Hot Processes,” American Industrial Hygienists Association Journal, Vol. 34, No. 11, 1973, pp. 481-486.
[31] 桃園縣政府環保局,餐飲業空氣汙染防治宣導及線上諮詢, http://web.tyepb.gov.tw/94RepastWeb/art_page5.asp
[32] Flagan, R. C. and Seinfeld, J. H., Fundamentals of Air Pollution Engineering, Prentice Hall, Englewood Cliffs, New Jersey, 1988, pp. 290-357.