Barn climate and emissions
The average time to renew the air volume in a barn (air exchange rate) is a characteristic parameter to evaluate barn climate (animal welfare) and emissions (environmental impact). The air exchange rate of mechanically ventilated barns is a defined tuning parameter, while its determination is sophisticated in the case of naturally ventilated buildings. Different air flows in the barn mediate the transport of heat, humidity, pollutant gases and particles (e.g., dust and bioaerosols). The air flow patterns are usually very complex and characterised by a large temporal and spatial variability. Emission sources are diffuse and cover the housing system itself (animal metabolism, manure and urine) as well as manure storage and its application to fields. Procedural influences and features of the atmospheric boundary layer near the ground shape the emission and dispersion processes originating from livestock husbandry.
We study air flow processes in and around facilities for livestock husbandry and the resulting air exchange and emission rates with our three-column-concept:
Since 2004 we study meteorological variables (i.e., air velocity, temperature and relative humidity) and concentrations of pollutant gases in a dairy cattle barn in Dummerstorf in cooperation with the Mecklenburg-Vorpommern State Institute for Agriculture and Fishery. In addition, since 2015 measurements of barn climate are conducted in one of the dairy barns of the Institute for Education and Research in Groß Kreutz.
The large boundary layer wind tunnel is used as an evaluation tool to study air flow patterns and the transport of tracer gases in and around naturally ventilated barns. Effects of barn geometry and inflow direction for typical inflow profiles are investigated in the physical model.
Computational fluid dynamics (CFD) supports the investigation of the interaction of different drivers in the model (e.g. inflow, temperature gradients) to evaluate their impact on air flow and transport processes in and around facilities for livestock husbandry. Different turbulence parametrisations (RANS & LES models) are applied depending on the particular research question.
By integrating on-farm measurements with data from the boundary layer wind tunnel, comprehensive data sets are generated which, in combination with the numerical models, promote a further development of the technology and management in animal husbandry that combines aspects of animal welfare and environmental protection.
Current research questions
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