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Dynamic effects on containment of air-curtain fume hood operated with heat source.
MedLine Citation:
PMID:  23009207     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
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:
Jia-Kun Chen; Rong Fung Huang; Pei-Yi Hsin
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of occupational and environmental hygiene     Volume:  9     ISSN:  1545-9632     ISO Abbreviation:  J Occup Environ Hyg     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-09-26     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101189458     Medline TA:  J Occup Environ Hyg     Country:  England    
Other Details:
Languages:  eng     Pagination:  640-52     Citation Subset:  IM    
Affiliation:
a Graduate Institute of Applied Science and Technology , National Taiwan University of Science and Technology , Taipei , Taiwan , Republic of China.
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