Computational prediction of the effective temperature in the lying area of pig pens

Our investigations showed that the ceiling-jet inlet could be used to control air speed in the animal occupied zone and generate the same ET in the preferred lying area at a 9-degree higher outdoor temperature than if the same ventilation rate were delivered though the defuse ceiling only. This indicates that the periods of undesired high indoor temperature can be reduced from 40% to 5% of the time under Danish climate conditions. In addition, the results showed that the largest cooling effect was obtained when the ceiling-jet inlet was opened less than 30% due to the generation of the jet's being attached to the ceiling.