有冷风侵入房间采用碰撞射流热风供暖时的温度分布特征
Temperature distribution in impinging jet ventilation heating room with cold air infiltration
摘要：
对有明显冷风侵入房间采用碰撞射流热风供暖时在不同开门时长和送风参数条件下的室内空气温度和气流速度分布特征进行了实测研究。结果表明：冷风侵入使得碰撞射流热风供暖房间室内温度梯度小的优势明显减弱，但风口附近气流速度没有增大；送风速度越大，冷风侵入引起的头足温差和室内上下部温差越小。建议有明显冷风侵入的房间使用碰撞射流热风供暖时应采用较大的送风速度。
Abstract：
Investigate the airflow and temperature distribution in a room with cold air infiltration adopting the impinging jet ventilation(IJV) heating system under different conditions of door opening time and air supply parameters. The results indicate that the advantage of small temperature gradient in IJV rooms is evidently weakened due to cold air infiltration, but the velocity near the nozzle does not increase. Both the floortoceiling temperature difference and the temperature contrast between ankle and head levels induced by cold air infiltration decrease with an increased supply air velocity. Suggests adopting the appropriatly high supply air velocity in an IJV heating system for a room with obvious cold air infiltration.
Keywords:impinging jet ventilation, warmair heating, cold air infiltration, temperature distribution, door opening time, air supply velocity