Air Velocity Distribution in a Commercial Broiler House

摘要

Increasing air velocity during tunnel ventilation in commercial broiler production facilities improves production efficiency, and many housing design specifications require a minimum air velocity. Air velocities are typically assessed with a hand-heldvelocity meter at random locations, rather than systematic traverses. Simultaneous measurement of air velocity at multiple locations in the facility would provide a more accurate estimation of mean velocity. Objectives of this study were to develop a multi-point air velocity measurement system and map air velocity in a tunnel ventilated broiler house. An array of hot-bead type anemometers was placed in a commercial broiler production facility measuring 12.9 x 121.9 m with curtain side walls; the housewas equipped with ten 121.9 cm exhaust fans. Cross-sectional velocity measurements were taken in increments of 12.19 m starting at 12.19 m from the end wall of the house and ending at 12.19 m away from the exhaust fans; one cross section of the house wastested at a time. The sensors were allowed a 2 min settling time before 5 min of data collection at each location. Air velocities were compiled at 45.7, 106.7, 167.6 and 213.4 cm above the litter. Mean velocities ranged from 1.94 m/s to 3.06 m/s (382 ft/min to 602ft/min) across all cross-sections measured. All location contributions to the ANOVA were significant (P < 0.0185) and regression results showed a quadratic relationship between transverse location and air velocity.