Fume Hood Performance: Using a Bypass in Variable Air Volume Systems

Joao, Richard V.; Party, Esmeralda; Gershey, Edward L.

doi:10.1080/1047322x.1998.10390146

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…Some of these cross drafts are a consequence of natural phenomena and some are induced by the transit and actions of laboratory personnel, such as rapidly sash opening and people walk by. The results of previous researches indicate that the temporal variability induced by the cross drafts will cause some increased contaminant outbreaks [1][2][3][4][5][6] . The previous studies [7][8][9][10][11] suggest that maintaining a specific face velocity would not guarantee that a fume cupboard could perform high containment efficiency because no correlation between the face velocity and the performance was observed.…”

Section: Introductionmentioning

confidence: 99%

Effects of Sash Movement and Walk-bys on Aerodynamics and Contaminant Leakage of Laboratory Fume Cupboards

et al. 2007

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Section: Introductionmentioning

confidence: 99%

Effects of Sash Movement and Walk-bys on Aerodynamics and Contaminant Leakage of Laboratory Fume Cupboards

et al. 2007

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Flow and Containment Characteristics of a Sash-less, Variable-Height Inclined Air-Curtain Fume Hood

2013

The Annals of Occupational Hygiene

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To increase containment efficiency and reduce energy consumption, a sash-less, variable-height inclined air-curtain fume hood (sIAC hood) was developed and tested by a laser-assisted flow visualization technique and tracer-gas detection method. This novel design requires neither sash nor baffle. The sIAC hood employed the inclined push-pull air-curtain technique and two deflection plates installed on the side walls of the hood to induce a tetra-vortex flow structure. The results of flow visualization showed that the slot for suction flow, offset from the slot for the up-blowing jet, caused the air curtain to incline towards the rear wall, thus enhancing the robustness of the tetra-vortex flow structure. Such a flow structure could reduce the influence of draught and human walk-by across the hood face. The containment around the central area of the hood was isolated by the inclined push-pull air curtain. The pollutants carried by the reverse flow induced by the flow separation were guided by the deflection plates from the side walls towards the rear, thus contributing to the formation of the tetra-vortex flow structure. The up/down movable ceiling positioned the suction slot close to the device's pollutant emission opening, but left room (less than 50 cm) for unrestricted hand movement. Testing was carried out based on the methodology described in EN14175. The results of a static test showed that small face velocities of 0.25 and 0.16 m s(-1) were enough to obtain nearly null leakage levels for low and tall pollutant sources. The results of a traversing plate test showed that the face velocity, 0.32 m s(-1), would cause negligibly small leakage levels. The sIAC hood could obtain significantly higher containment efficiency than a conventional hood by operating at a face velocity significantly lower than that of conventional hoods.

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Fume Hood Performance: Using a Bypass in Variable Air Volume Systems

Cited by 2 publications

References 6 publications

Effects of Sash Movement and Walk-bys on Aerodynamics and Contaminant Leakage of Laboratory Fume Cupboards

Effects of Sash Movement and Walk-bys on Aerodynamics and Contaminant Leakage of Laboratory Fume Cupboards

Flow and Containment Characteristics of a Sash-less, Variable-Height Inclined Air-Curtain Fume Hood

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