It is well known that pig production is an important source of polluting gaseous emissions in Denmark. Aiming at effectively reducing gas emissions and improving indoor air quality, a concept of Precision Zone Ventilation including direct air supply to/extraction from animal occupied zone and pollution source zone and etc. was proposed. In this PhD study, we primary focused on partial pit ventilation (PPV) system using an extra pit air exhaust extracting polluting air directly from pit headspace. Experiments were carried out both in laboratory and field conditions. Performances of PPV system on airflow and gas dispersion were analysed. In addition, computational fluid dynamics (CFD) was introduced for modelling pig house with PPV system. A geometry simplification method was also assessed.

The results of this PhD study demonstrate that partial pit ventilation is a cost effective approach to mitigate emissions from mechanically ventilated pig housing when combined with air purification system. Meanwhile, this study provides reference for CFD simulations on pig building with PPV system.

Precision Zone Ventilation Design and Application in Pig Housing

Effects of different air inlets on indoor air quality and ammonia emission from two experimental fattening pig rooms with partial pit ventilation system - Summer condition, Zong, C., Feng, Y., Zhang, G. and Hansen, M.J. Biosystems Engineering. May 2014, Citations

Carbon dioxide production from a fattening pig building with partial pit ventilation system, Zong, C., Zhang, G., Feng, Y. and Ni, J.-Q. Biosystems Engineering. October 2014, Citations

Numerical modelling of airflow and gas dispersion in the pit headspace via slatted floor: Comparison of two modelling approaches, Zong, C. and Zhang, G. Computers and Electronics in Agriculture. November 2014, Citations