REDUCED DIRECT MEASURING METHODS IN THE RIDGE VENT OF A DAIRY BARN

Accurate measurement of livestock housing emissions is necessary to assess their environmental impact of the performance of applied mitigation techniques. These emission measurements can be conducted by combining local air velocity and pollutant concentration measurements. However, unsteady wind conditions challenge measuring the air velocities at naturally ventilated buildings. Spatially dense measurements, however, are rarely feasible due to economic and practical constraints. Simplification of measurement methods with limited loss of accuracy is therefore necessary.
The objective of this research was to reduce the amount of air velocity sampling places in order to measure the airflow rate through the ridge vent without exceeding an accuracy loss of ± 20% with respect to detailed measurements.