Research on the Effect of Angles of Airflow to form Displacement Ventilation Air Distribution in Winter

摘要

As heat pollutant and dust pollutant sources both exist, large workshop of welding and grinding are specially finable to adopt displacement ventilation system. Displacement ventilation system has been developed based on summer condition. In order to research the effect of air distribution in winter, numerical simulation and experiment method are taken to study flow field in a large displacement ventilation workshop. Effects of air distribution in winter condition is changed by adjusting air angle of cylindrical ventilators and brought in ventilation efficiency η to estimate air distribution of angles 0°, 15°, 30°, 30°, 45°, 60°, 75° to horizontal direction separately. Based on these studies, the following conclusions can be obtained: (1) the thermal buoyancy lift effect of hot stream can be reduced by adjusting the angle of air supply downward, and air distribution of displacement ventilation can be improved in winter. (2) With the angle of 45°, the ventilation efficiency η is better than the others.