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

0531138 - ÚT 2021 RIV CH eng J - Journal Article
Yi, Q. - Janke, D. - Thormann, L. - Zhang, G. - Amon, B. - Hempel, S. - Nosek, Štěpán - Hartung, E. - Amon, T.
Airflow Characteristics Downwind a Naturally Ventilated Pig Building with a Roofed Outdoor Exercise Yard and Implications on Pollutant Distribution.
Applied Sciences-Basel. Roč. 10, č. 14 (2020), č. článku 4931. E-ISSN 2076-3417
R&D Projects: GA MŠMT(CZ) LTC18070
Institutional support: RVO:61388998
Keywords : emission * turbulence * roof slope * scaled model * wind tunnel * dispersion
OECD category: Meteorology and atmospheric sciences
Impact factor: 2.679, year: 2020
Method of publishing: Open access
https://www.mdpi.com/2076-3417/10/14/4931

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.
Permanent Link: http://hdl.handle.net/11104/0310984