Abstract
Mixing fans typical of those used in naturally ventilated poultry housing in warm weather were tested in an experimental building to determine effects of fan placement height and tilt angle on airflow. The airflow pattern generated by tilted mixing fans can be characterized as the air jet from the fan impinging at an angle to the floor and forming a wall jet flowing along the floor. Tests with three fans showed that area-averaged and maximum air velocities near the floor varied strongly with fan height and tilt angle. For tilt angles of 20° or less from horizontal, area-averaged velocity increased with tilt angle and decreased with increasing fan height. Contour plots of velocity were generated for comparing airflow 25 cm (10 in.) above the floor. Combinations of fan, tilt, and height can be selected to achieve desirable area-averaged air velocities while minimizing areas covered with undesirably high air velocities.
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