ISOTHERMAL AIR-FLOW CHARACTERISTICS IN THE ANIMAL-OCCUPIED ZONE OF A SLOT-VENTILATED SWINE FACILITY

Airspeed and turbulence measurements were collected in a full-scale sw ine grower facility. Data were collected in three horizontal planes at eight axial locations from the inlet sidewall. Three inlet slot heigh ts (20, 40, and 60 mm) and two fan stages resulted in six ventilating conditions investigated. The resulting 2 x 3 x 8 factorial experiment showed that fan stage, inlet height, and axial position from the inlet significantly affected (p < 0.01) airspeed variations in the animal-o ccupied zone (AOZ). Correlations between the AOZ and a convenient meas uring plane (MP) were sought. AOZ airspeed was highly correlated with MP airspeed (r(xy) = 0.91). AOZ turbulent intensify (r(xy) = -0.51) an d turbulent kinetic energy (r(xy) = 0.75) were moderately correlated w ith MP airspeed. AOZ turbulence levels were not correlated with MP tur bulence levels. A procedure, consistent with the system characteristic technique, is proposed for predicting axial variations in AOZ airspee d. The technique can be used to assess AOZ airspeed levels relative to penning layout and ventilating conditions.