Vortex Ventilation in the Laboratory Environment.
Assured containment at low airflow has long eluded the users of ventilated enclosures including chemical fume hoods used throughout industry. It is proposed that containment will be enhanced in a hood that has a particular interior shape that causes a natural vortex to occur. The sustained vortex im...
| Published in: | Journal of Occupational & Environmental Hygiene Vol. 11; no. 10; pp. 672 - 680 |
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| Format: | equations & formulas pictorial research tables/charts Journal Article |
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Taylor & Francis Ltd
Oct2014
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| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=103883159&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 103883159 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 15459624 V1L jtl: Journal of Occupational & Environmental Hygiene issn: 15459624 maglogo: Y pubinfo: dt: Oct2014 vid: 11 iid: 10 pid: 377 pub: Taylor & Francis Ltd place: Philadelphia, Pennsylvania artinfo: ui: 103883159 97806965 10.1080/15459624.2014.902952 NLM25175282 103883159 ppf: 672 ppct: 8 formats: fmt: @attributes: type: P tig: atl: Vortex Ventilation in the Laboratory Environment. aug: au: Meisenzahl, Lawrence R. affil: Engineering Department, E.I. DuPont de Nemours and Company, Wilmington, Delaware sug: subj: Occupational Exposure Prevention and Control Ventilation Equipment and Supplies Laboratories Human Delaware Models, Anatomic Funding Source Air Pollutants, Occupational Sulfur Compounds Spectrophotometry Data Analysis Software Mathematics Analysis of Variance Post Hoc Analysis Quality Control (Technology) ab: Assured containment at low airflow has long eluded the users of ventilated enclosures including chemical fume hoods used throughout industry. It is proposed that containment will be enhanced in a hood that has a particular interior shape that causes a natural vortex to occur. The sustained vortex improves the containment of contaminants within the enclosure at low airflow. This hypothesis was tested using the ASHRAE 110 tracer gas test. A known volume of tracer gas was emitted in the hood. A MIRAN SapphIRe infrared spectrometer was used to measure the concentration of tracer gas that escapes the enclosure. The design of the experiment included a written operating procedure, data collection plan, and statistical analysis of the data. A chemical fume hood of traditional design was tested. The hood interior was then reconstructed to enhance the development of a vortex inside the enclosure. The hood was retested using the same method to compare the performance of the traditional interior shape with the enhanced vortex shape. In every aspect, the vortex hood showed significant improvement over the traditional hood design. Use of the Hood Index characterizing the dilution of gas in an air stream as a logarithmic function indicates a causal relationship between containment and volumetric airflow through an enclosure. Use of the vortex effect for ventilated enclosures can provide better protection for the user and lower operating cost for the owner. [Supplementary materials are available for this article. Go to the publisher's online edition ofJournal of Occupational and Environmental Hygienefor the following free supplemental resource: a data collection spreadsheet, data analysis, and data collection procedure.] pubtype: Academic Journal doctype: equations & formulas pictorial research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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