Deposition of fine particles on building internal surfaces

Hamdani, S. El; Limam, Karim; Abadie, Marc; Bendou, Abdelaziz

doi:10.1016/j.atmosenv.2008.09.005

Cited by 45 publications

(15 citation statements)

References 19 publications

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“…Turbulence intensity also has a smaller impact for galvanized sheet metal than for the other materials, which may be due to its small surface roughness. Based on the literature, the surface roughness for the galvanized sheet metal is 0.15 mm (ASHRAE Handbook 2005) and for the linoleum coating it is 0.08 mm (El Hamdani et al 2008). It should be noted that linoleum is a more complex surface than sheet metal with both microscopic (coating: 0.08 mm) and macroscopic (tile texture: 0.5 mm) surface roughness elements.…”

Section: Resuspensionmentioning

confidence: 99%

Impact of Airflow Characteristics on Particle Resuspension from Indoor Surfaces

Mukai

Siegel

Novoselac

2009

Aerosol Science and Technology

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Resuspension is an important source of indoor particles. We measured the resuspension of 1 to 20 µm particles on common indoor materials and explored the importance of turbulence to the resuspension process. Experimental variables included materials (linoleum, carpet, and galvanized sheet metal) and bulk air velocity (5, 10, 15, 20, and 25 m/s). At each of these conditions the turbulence intensity in the boundary layer was varied between a low, medium, and high state and ranged from 9 to 34% at the surface. For comparison of resuspension from the considered surfaces and at different flow conditions, we use the relative resuspension, which quantifies resuspension without requiring knowledge of the number of particles initially seeded on the surface. The relative resuspension compares the fraction of particles resuspended at the experimental conditions to the maximum achieved with a controlled impinging jet. In general, the results show that for the ranges considered, increasing velocity caused the largest increase in resuspension, followed by increasing turbulence intensity and then increasing particle diameter. All three material types showed consistent patterns with carpet having the largest resuspension for a given set of conditions, followed by linoleum and then by galvanized sheet metal. High turbulence and high velocity conditions minimized the differences between materials. An understanding of the relative magnitudes of these effects allows for better analysis and mitigation of indoor resuspension.

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Section: Resuspensionmentioning

confidence: 99%

Impact of Airflow Characteristics on Particle Resuspension from Indoor Surfaces

Mukai

Siegel

Novoselac

2009

Aerosol Science and Technology

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“…Particle deposition has been studied experimentally in controlled chambers or real buildings (Offermann et al, 1985;Xu et al, 1994;Byrne et al, 1995;Fogh et al, 1997;Normura et al, 1997;Lai et al, 2002;Thatcher et al, 2002;Chao et al, 2003;Wallace et al, 2004;Bouilly et al, 2005;He et al, 2005;Hussein et al, 2005b;Lai and Nazaroff, 2005;Chen et al, 2006;Hussein et al, 2006;Hamdani et al, 2008;Hussein et al, 2009;Chen et al, 2012b). Due to the perfect air tightness of the chamber, the outdoor particle penetration and indoor particle removal by air exchange can be neglected.…”

Section: Particle Deposition Ratesmentioning

confidence: 99%

Measuring the Short-Term Emission Rates of Particles in the “Personal Cloud” with Different Clothes and Activity Intensities in a Sealed Chamber

You

Cui

Chen

et al. 2013

Aerosol Air Qual. Res.

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A series of measurements were conducted to determine the short-term emission rates of particles in the "personal cloud" (i.e., particle emission from a clothed human body) in a sealed chamber. By recording the concentration of particles of different sizes during a period of time in the chamber, curves monitoring the evolution of particle concentration caused by emissions from a clothed human body were obtained. Based on the measured evolution of particle concentrations and deposition rates, the emission rates of particles from a clothed human body were estimated with a physical model. Generally speaking, the size-dependent emission rates of particles from a human body wearing a clean room smock were the lowest, while those from one wearing a cotton suit were the highest among the forms of clothing examined this work. Furthermore, the emission rates of particles from a clothed human body were positively correlated with the intensity of human activity. In addition, activities tended to have a more significant impact on the emission rates with regard to coarse rather than fine particles. The experimental data for the emission rates of particles from a clothed human body provided in this study may be used in further particle exposure assessments in certain indoor environments, such as clean rooms and aircraft cabins, as a valid input parameter.

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“…Although many studies on ventilation system performance are available for classrooms (Norback and Nordstrom, 2008), offices (Pereira et al, 2008) and homes (Hamdani et al 2008), and a comparative experimental study on displacement and mixing ventilations was conducted for an office case (He et al, 2005), very few have been done for hospital wards. Thus, there is a paucity of good quality data from which to make important decisions and develop guidelines regarding the ventilation of general ward spaces (Beggs et al 2008).…”

Section: Introductionmentioning

confidence: 99%