CFD ANALYSES OF THE INFLUENCE OF VENTILATION SYSTEM ON THE EFFECTIVENESS OF A PARTIAL PIT EXHAUST

This work utilized CFD methods to investigate how different ventilation system layouts influence the ability of a partial pit exhaust ventilations system to capture ammonia emission in a growing pig unit with partly slatted and partly drained floor.
The simulations showed that cleaning 10% of ventilations capacity expelled through the ceiling exhaust using a by-pass method could remove 40-44% of the yearly ammonia emission.
But if the cleaned air was expelled beneath the floor this Fig. increased to 49-65%, and best results (62-65%) were obtained if the exhausts were located in the wall end of the pit.
The inlet configuration had a very limited influence on the effectiveness of the partial pit exhaust.
But it is important to acknowledge that other room geometries, inlet design or locations may increase the influence of the inlet configurations.
The work was based on a single geometrical model, including predefined boundaries that made it possible to specify and investigate a large number of different ventilation configuration, in a very time saving way.

Ist International Symposium on CFD Applications in Agriculture

B. Bjerg , G.-Q. Zhang

CFD, pit exhaust, pigs, ammonia emission

https://doi.org/10.17660/ActaHortic.2013.1008.18