paper_ageng_98 - EurAgEng Paper no 98-G-015 Title DUST LOAD...

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EurAgEn g Paper no: 98-G-015 Title: DUST LOAD ON SURFACES IN ANIMAL BUILDINGS: AN EXPERIMENTAL MEASURING METHOD. Authors: P. Lengweiler 1 , J.S. Str¿m 2 , H. Takai 2 , P. Ravn 2 , P.V. Nielsen 3 , A. Moser 1 1 ETH Zentrum, 8092 Z±rich, Switzerland 2 Danish Institute of Animal Science, Research Centre Bygholm, 8700 Horsens, Denmark 3 Department of Building Technology and Structural Engineering, Aalborg University, Sohngaardsholmsvej 57, 9000 Aalborg, Denmark Summary: To investigate the physical process of particle deposition on and resuspension from surfaces in animal buildings, a test facility and a sampling method is established. The influences of surface orientation and air turbulence and velocity just as other parameters on the dust load on a surface are analysed. It is found that the surface orientation is the parameter which influences the dust load most. The dust load is highest on the floor but some dust is also sampled on the walls and the ceiling. The measurements indicate that the air velocity has a non-linear influence and that the turbulence has a larger effect on the deposition than on the resuspension. Therefore high turbulence causes high dust load. However, the influence of turbulence and velocity are strongly dependent on each other and cannot be analysed in isolation.
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page 2 INTRODUCTION High concentrations of organic dust in animal buildings, primarily in swine buildings, have shown to cause health problems for both people and animals. To develop methods to eliminate dust related problems, there is, among other things, a need for better understanding of the mechanism behind dust deposition and resuspension. Dust deposition can reduce considerably the airborne dust concentration and, on the other hand, resuspension can increase the concentration for more than 100 % (Goddard et al. 1995). The dust load is the amount of dust building up on the surface. The dust load is thus the balance between the mechanism of dust deposition on and resuspension from the surface. The deposition is defined as the rate of settling particles on the surface and the resuspension is the rate of removal of particles from the surface. Both deposition and resuspension are dependent on environmental conditions like air velocity and turbulence, on the surface conditions like orientation and roughness, on the type of particles and on other forces. Ideally, knowledge of both mechanism is needed, but as a first step the focus is on improved knowledge of factors that influence the dust load. The purpose of this paper is to describe a facility to measure dust load on different
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paper_ageng_98 - EurAgEng Paper no 98-G-015 Title DUST LOAD...

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