The Influence of Air Motion on Bacteria Removal in Negative Pressure Isolation Rooms

Huang, Jeng-Min; Tsao, Shih‐Ming

doi:10.1080/10789669.2005.10391155

Cited by 25 publications

(50 citation statements)

References 3 publications

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“…Dnevno oddajajo ljudje več kot 10 7 delcev kože (43). Bolniki zaradi kihanja, kašljanja ali govorjenja še dodatno širijo mikroorganizme po zraku (44,45). Bitkover s sod.…”

Section: Biološki Dejavniki Tveganja Za Zdravjeunclassified

Identification and Control of Health Risks in Hospital Environment from the Aspect of Users, Buildings and Systems

Dovjak¹,

Kukec²,

Krainer³

2013

Slovenian Journal of Public Health

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“…Dnevno oddajajo ljudje več kot 10 7 delcev kože (43). Bolniki zaradi kihanja, kašljanja ali govorjenja še dodatno širijo mikroorganizme po zraku (44,45). Bitkover s sod.…”

Section: Biološki Dejavniki Tveganja Za Zdravjeunclassified

Identification and Control of Health Risks in Hospital Environment from the Aspect of Users, Buildings and Systems

Dovjak¹,

Kukec²,

Krainer³

2013

Slovenian Journal of Public Health

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“…Tang et al [3] demonstrated in their experimental model that, despite negative pressure, opening the door could have resulted in transport of infectious air out of the isolation room, leading to a breakdown in isolation conditions. Huang and Tsao [4] used CFD and experiment to discuss the steady state (breathed) and transient (coughed) bacteria removal in one-bed negative-pressure isolation room, considered the thermal buoyancy effect. They also analyzed the difference between the patient's lying on back and lying on side.…”

Section: Introductionmentioning

confidence: 99%

“…The GWB contains bacteria or fine sputum droplets exhausted from the patient's mouth and nose. The mass composition of GWB is CO 2 7.2%, N 2 75%, H 2 O 3.8%, O 2 14% (Huang and Tsao [4]). …”

Section: Physical Model and Equationsmentioning

confidence: 99%

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The Influence of the Bed with a Semiopen Hood on Bacteria Removal in a Negative-Pressure Isolation Room

Huang

Cheng

2014

Advances in Mechanical Engineering

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This study numerically investigates the influence of a sickbed with a semiopened hood on bacteria removal in a negative-pressure isolation room. The parameters include air change rate, lying style, the length and height of hood, flow rate allotments, and the positions of outlets. The results show that the hood has excellent effect on the removal of contaminated air, which is much better than the case without hood. The flow field of patient's face up cough is very different from face side cough, and the contaminated air cannot be removed properly through one air outlet. There are three outlets on the hood, set straight above the patient's face and at both sides. The allotment of the exhaust flow rate of the upper outlet to that of side outlets is suggested to be 4 : 6. When the total air change rate is above 6 ACH, the hood length has slight influence on pollutant removal. The increase of hood height has a negative impact when the patient coughs lying on back. When the side exhaust flow rate is high, the hood height has a slight impact for face side cough. The recommended air change rate for the negative-pressure ward with sickbed hood is above 5 ACH.

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“…Other researchers have numerically studied the transport of bacteria through an expiratory process in an isolation room (Zhao et al 2009;Richmond-Bryant 2009;Huang and Tsao 2005). The detailed features of body geometry have also been examined in a study of personal exposure when two occupants are positioned opposite each other (Gao and Niu 2006).…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Exhaled Aerosol Transport Under Two Ventilation Systems

Lai

Wong

2010

Aerosol Science and Technology

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Although the importance and implications of studying expiratory droplet concentration distribution in indoor environments are obvious, experimental measurements are very scarce and incomplete. In the work described herein, spatial and temporal aerosol concentrations generated by a modeled expiratory process were studied experimentally. Two heated manikins were placed inside a chamber with either a displacement ventilation system or a ceiling supply and ceiling return ventilation system. One of the manikins emitted 0.05 micrometer monodisperse polystyrene microspheres mimicking the generation of expiratory droplets. Flow characteristics were measured by a hot-film anemometry system before and after the momentary emission of aerosols at three locations. The temporal concentration profiles at eight locations were also measured. The results show that a high-speed air jet easily penetrates the boundary layer of the manikin regardless of the ventilation system used. Transient ventilation effectiveness was also evaluated and compared for both ventilation systems. The results show that the ventilation effectiveness of displacement ventilation is always higher than that of ceiling-type ventilation. Experimental observation also suggests that the presumption of complete mixing must be applied cautiously.

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The Influence of Air Motion on Bacteria Removal in Negative Pressure Isolation Rooms

Cited by 25 publications

References 3 publications

Identification and Control of Health Risks in Hospital Environment from the Aspect of Users, Buildings and Systems

Identification and Control of Health Risks in Hospital Environment from the Aspect of Users, Buildings and Systems

The Influence of the Bed with a Semiopen Hood on Bacteria Removal in a Negative-Pressure Isolation Room

Experimental Investigation of Exhaled Aerosol Transport Under Two Ventilation Systems

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