Influences of High-temperature Operation on Flow and Containment Characteristics of Air-curtain Fume Hood

• Main Authors: Pei-yi Shin, 辛佩怡
• Other Authors: Rong-fung Huang
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/33580493797965608565

碩士 === 國立臺灣科技大學 === 機械工程系 === 98 === 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.