A two compartment model for determining the contribution of sources, surface deposition and resuspension to air and surface dust concentration levels in occupied rooms

Schneider, Thomas; Kildes, J.; Breum, Niels O.

doi:10.1016/s0360-1323(98)00048-1

Cited by 58 publications

(51 citation statements)

References 36 publications

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“…More recent research indicates that resuspension of particles from surfaces contributes substantially to the increase of PM concentrations in an occupied residence, and several studies have investigated elevated PM concentration by human activity such as moving papers, dusting, and walking around (Thatcher and Layton 1995;Ferro et al 2004;Karlsson et al 1999). Only recently has resuspension been included in indoor air models as a source of PM (e.g., Schneider et al 1999;Bennett and Furtaw 2004). Schneider et al (1999) developed a two-compartment model for particle transport in indoor surface and air compartments.…”

Section: Introductionmentioning

confidence: 99%

Resuspension of Dust Particles in a Chamber and Associated Environmental Factors

Qian

Ferro

2008

Aerosol Science and Technology

164

156

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Experiments investigating particle resuspension from human activities were conducted in a full-scale experimental chamber. The experiments tested three types of flooring (vinyl tiles, new and old level-loop carpets) and two ventilation configurations (ceiling and side wall supply systems). The floorings were seeded with 0.1-10 µm test particles. The airborne particle concentration was measured by an array of optical particle counters (OPCs) in the chamber. Resuspension rates were estimated in size ranges of 0.8-1, 1.0-2.0, 2.0-5.0, and 5.0-10 µm ranging from 10 −5 -10 −2 hr −1 , with higher resuspension rates associated with larger particles. Resuspension via walking activity varied from experiment to experiment. "Heavy and fast" walking was associated with higher resuspension rates than less active walking, most likely due to a combination of increased pace, increased air swirl velocity, and electrostatic field effects established by the walking. The type of floorings also influenced the particle resuspension. Given the same size and mass distribution of test particles per unit floor area, resuspension rates for the seeded new level-loop carpet were significantly higher than those for the vinyl tile flooring for larger particles (1.0-10 µm) under the ceiling air supply system. INTRODUCTIONAs summarized by Lioy et al. (2002), settled dust is dominated by particles smaller than 500 µm; the most frequently identified components in house dust are skin, soil, starch, hair, cotton, and plant material (>85% of samples); and the second most frequently identified components are fungal material, synthetic fibers, polymers, paint, and metals. Specific toxicants identified in dust include semivolatile and non-volatile pesticides, polycyclic aromatic hydrocarbons (PAHs), heavy metals,

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Section: Introductionmentioning

confidence: 99%

Resuspension of Dust Particles in a Chamber and Associated Environmental Factors

Qian

Ferro

2008

Aerosol Science and Technology

164

156

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“…Lai and Nazaroff [4] have indicated that modelling of resuspention and rebound is not essential due to low air velocities and turbulent intensities in the indoor environment. It is however important to note that implementation of a resuspention model in de drift-flux model is feasible [6].…”

Section: Deposition Of Particlesmentioning

confidence: 99%

“…The approach is based on the drift-flux method described by Lai and Nazaroff [4]. In literature the drift-flux method is described extensively and the method is also specifically developed for the dispersion of particles in an indoor environment [4][5][6][7][8][9].…”

Section: Modelling Of Particle Dispersionmentioning

confidence: 99%

CFD modelling of radioactive pollutants in a radiological laboratory

With

2009

WIT Transactions on Ecology and the Environment

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An important aspect of indoor air quality is the presence of radioactive pollutants. These pollutants can be present in the form of gas or particles, and are typically found in nuclear installations and radiological laboratories. In this work the dispersion of radioactive pollutants in an indoor environment is studied using Computational Fluid Dynamics (CFD). The aim of this work is to evaluate the exposure to radioactive particles during an accidental release, and to evaluate suitable ventilation design to minimise exposure. These CFD findings are used towards improvement of the Dutch assessment procedures for evaluating the risk of radioactive exposure to radiological workers. For the purpose of this work a CFD model is developed to simulate the dispersion and nuclear decay of gas and aerosols, and the attachment and deposition of radioactive aerosols.

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“…To get an order of magnitude estimate of the importance of this potential exposure route a model calculation has been made. Using the semi-empirical model by Schneider et al (1999) the deposition velocity to a vertical surface the velocities shown in Figure 25, have been calculated. U* is the friction velocity.…”

Section: Surface Depositionmentioning

confidence: 99%

Evaluation and control of occupational health risks from nanoparticles

Schneider¹

2007

TemaNord

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A two compartment model for determining the contribution of sources, surface deposition and resuspension to air and surface dust concentration levels in occupied rooms

Cited by 58 publications

References 36 publications

Resuspension of Dust Particles in a Chamber and Associated Environmental Factors

Resuspension of Dust Particles in a Chamber and Associated Environmental Factors

CFD modelling of radioactive pollutants in a radiological laboratory

Evaluation and control of occupational health risks from nanoparticles

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