title: Dynamic effects on containment of air-curtain fume hood operated with heat source.
abstract: This study focused on the leakage characteristics of the air-curtain fume hood that are subject to the influences of sash movement and walk-by motion while a high temperature heat source was operated in the hood. The flow visualization and trace gas test method were used to investigate the performance of the air-curtain fume hood. An electric heater was placed in the hood to simulate the heat source. The temperature of the heat source installed inside the air-curtain fume hood varied between 180°C and 300°C. Trace gas tests following the dynamic test methods of EN-14175 protocol were employed to measure the spillages of sulfur hexafluoride gas that were released in the hood. When subject to the influence of sash movement at a heat source temperature lower than 260°C, the leakage level was high at the suction velocity V(s) < 8 m/sec but was negligibly small at V(s) > 10 m/sec. When subject to the influence of people walk-by, the leakage level was relatively low at the suction velocity larger than 8 m/sec at sash height H = 50 cm. The height of the sash opening was a crucial parameter for the containment of the air-curtain fume hood. At the sash opening lower than about 25 cm, suction velocity less than or equal to 6 m/sec was enough to make the sulfur hexafluoride leakage less than the threshold value, 0.65 ppm, suggested by the BG Chemie. The air-curtain fume hood presented a great performance to resist the effect of drafts even though there was a high temperature heat source working in the hood.
authors.affiliation: Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei, Taiwan, Republic of China.
authors.forename: Jia-Kun
authors.initials: JK
authors.lastname: Chen
authors.forename: Rong Fung
authors.initials: RF
authors.lastname: Huang
authors.forename: Pei-Yi
authors.initials: PY
authors.lastname: Hsin
mesh_terms: D000392:Air Movements; D016902:Air Pollution, Indoor / Q000517:prevention & control*; D004867:Equipment Design; D005740:Gases; D006358:Hot Temperature; D009038:Motion; D016273:Occupational Exposure / Q000517:prevention & control*; D014691:Ventilation / Q000295:instrumentation*
chemical_list: D005740:Gases