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

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, t...

Full description

Saved in:
Bibliographic Details
Published in:Applied sciences 2020-07, Vol.10 (14), p.4931
Main Authors: Yi, Qianying, Janke, David, Thormann, Lars, Zhang, Guoqiang, Amon, Barbara, Hempel, Sabrina, Nosek, Štěpán, Hartung, Eberhard, Amon, Thomas
Format: Article
Language:English
Subjects:
Air flow
Air pollution
Air recirculation
Animal welfare
Atmospheric boundary layer
Barns
Boundary layers
Buildings
Buildings and facilities
dispersion
Distribution
emission
Emissions
Environmental impact
Gaseous pollutants
Growth
Heating, cooling and ventilation
Hogs
Housing
Indoor air quality
Livestock
Livestock farms
Mitigation
Open spaces
Outdoors
Phase Doppler Anemometer
Physiological aspects
Pollutants
Pollution dispersion
Properties
Reynolds number
roof slope
Roofs
scaled model
Swine
turbulence
Velocity
Ventilation
wind tunnel
Wind tunnels
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:2076-3417
2076-3417
DOI:10.3390/app10144931