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EFFECT OF VENTILATION RATE ON DUST SPATIAL DISTRIBUTION IN A MECHANICALLY VENTILATED AIRSPACE

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Transactions of the ASAE.  VOL. 43(6): 1877-1884 . (doi: 10.13031/2013.3092) @2000
Authors:   X. Wang, Y. Zhang, L. Y. Zhao, G. L. Riskowski
Keywords:   Air quality, Dust spatial distribution, Ventilation rate, Multi-point sampler

Dust spatial distribution is an important variable to understand the nature of dust transportation and to implement appropriate control strategies. There is a lack of data on dust spatial distribution in mechanically ventilated airspaces because of lack of adequate sampling techniques. In this project, a multi-point sampler was used to measure the dust spatial distribution at different ventilation rates in a mechanically ventilated airspace, which was an isothermal and two-dimensional flow empty room. Dust mass concentration varied as much as 30-fold between the lowest and the highest within the mechanically ventilated airspace. Ventilation rate had a large effect on the dust spatial distribution. Increasing the ventilation rate reduced the overall mean dust concentration when ventilation rates were lower than 56 air changes/h (ACH). When ventilation rates were higher than 56 ACH in this study, the overall mean dust concentration did not change much (<4%) as the ventilation rate increased by 18%. The spatial gradients of dust concentration become relatively lower as the ventilation rate increases. There is a high dust concentration zone in the ventilated airspace, which is important for selecting proper locations for air cleaning devices.

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