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Review of Wind Tunnel Modelling of Flow and Pollutant Dispersion within and from Naturally Ventilated Livestock Buildings
Review

On Finding the Right Sampling Line Height through a Parametric Study of Gas Dispersion in a NVB

1
Department of Engineering for Livestock Management, Leibniz Institute for Agricultural Engineering and Bioeconomy, 14469 Potsdam, Germany
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Department of Civil and Architectural Engineering-Design and Construction, Aarhus University, 8000 Aarhus C, Denmark
3
Department of Veterinary Medicine, Institut of Animal Hygiene and Environmental Health, Freie Universität, 14163 Berlin, Germany
4
Hermann-Rietschel-Institut, Chair of Building Energy Engineering, Technische Universität, 10587 Berlin, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Francesca Scargiali
Appl. Sci. 2021, 11(10), 4560; https://doi.org/10.3390/app11104560
Received: 7 March 2021 / Revised: 13 April 2021 / Accepted: 26 April 2021 / Published: 17 May 2021
The tracer gas method is one of the common ways to evaluate the air exchange rate in a naturally ventilated barn. One crucial condition for the accuracy of the method is that both considered gases (pollutant and tracer) are perfectly mixed at the points where the measurements are done. In the present study, by means of computational fluids dynamics (CFD), the mixing ratio NH3/CO2 is evaluated inside a barn in order to assess under which flow conditions the common height recommendation guidelines for sampling points (sampling line and sampling net) of the tracer gas method are most valuable. Our CFD model considered a barn with a rectangular layout and four animal-occupied zones modeled as a porous medium representing pressure drop and heat entry from lying and standing cows. We studied three inflow angles and six combinations of air inlet wind speed and temperatures gradients covering the three types of convection, i.e., natural, mixed, and forced. Our results showed that few cases corresponded to a nearly perfect gas mixing ratio at the currently common recommendation of at least a 3 m measurement height, while the best height in fact lied between 1.5 m and 2.5 m for most cases. View Full-Text
Keywords: CFD; gas transport; tracer gas method; mixing ratio; Schmidt number CFD; gas transport; tracer gas method; mixing ratio; Schmidt number
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MDPI and ACS Style

Doumbia, E.M.; Janke, D.; Yi, Q.; Zhang, G.; Amon, T.; Kriegel, M.; Hempel, S. On Finding the Right Sampling Line Height through a Parametric Study of Gas Dispersion in a NVB. Appl. Sci. 2021, 11, 4560. https://doi.org/10.3390/app11104560

AMA Style

Doumbia EM, Janke D, Yi Q, Zhang G, Amon T, Kriegel M, Hempel S. On Finding the Right Sampling Line Height through a Parametric Study of Gas Dispersion in a NVB. Applied Sciences. 2021; 11(10):4560. https://doi.org/10.3390/app11104560

Chicago/Turabian Style

Doumbia, E. M., David Janke, Qianying Yi, Guoqiang Zhang, Thomas Amon, Martin Kriegel, and Sabrina Hempel. 2021. "On Finding the Right Sampling Line Height through a Parametric Study of Gas Dispersion in a NVB" Applied Sciences 11, no. 10: 4560. https://doi.org/10.3390/app11104560

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