Airflow Characteristics Downwind a Naturally Ventilated Pig Building with a Roofed Outdoor Exercise Yard and Implications on Pollutant Distribution

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  • Qianying Yi, Leibniz Institute for Agricultural Engineering and Bioeconomy
  • ,
  • David Janke, Leibniz Institute for Agricultural Engineering and Bioeconomy
  • ,
  • Lars Thormann, Leibniz Institute for Agricultural Engineering and Bioeconomy
  • ,
  • Guoqiang Zhang
  • Barbara Amon, University of Zielona Gora, Leibniz Institute for Agricultural Engineering and Bioeconomy, Tyskland
  • Sabrina Hempel, Leibniz Institute for Agricultural Engineering and Bioeconomy, Tyskland
  • Stepan Nosek, Institute of Thermomechanics AS CR, v.v.i, Prague
  • ,
  • Eberhard Hartung, Christian-Albrechts-University Kiel
  • ,
  • Thomas Amon, Free University Berlin, Leibniz Institute for Agricultural Engineering and Bioeconomy, Tyskland

The application of naturally ventilated pig buildings (NVPBs) with outdoor exercise yards is on the rise mainly due to animal welfare considerations, while the issue of emissions from the buildings to the surrounding environment is important. Since air pollutants are mainly transported by airflow, the knowledge on the airflow characteristics downwind the building is required. The objective of this research was to investigate airflow properties downwind of a NVPB with a roofed outdoor exercise yard for roof slopes of 5°, 15°, and 25°. Air velocities downwind a 1:50 scaled NVPB model were measured using a Laser Doppler Anemometer in a large boundary layer wind tunnel. A region with reduced mean air velocities was found along the downwind side of the building with a distance up to 0.5 m (i.e., 3.8 times building height), in which the emission concentration might be high. Additional air pollutant treatment technologies applied in this region might contribute to emission mitigation effectively. Furthermore, a wake zone with air recirculation was observed in this area. A smaller roof slope (i.e., 5° slope) resulted in a higher and shorter wake zone and thus a shorter air pollutant dispersion distance.

OriginalsprogEngelsk
Artikelnummer4931
TidsskriftApplied Sciences
Vol/bind10
Nummer14
DOI
StatusUdgivet - jul. 2020

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