数值模拟层状通风对室内热环境的影响

Numerical simulation of the influence on indoor thermal environment by stratum ventilation

以采用层状送风的典型办公建筑为研究对象,采用CFX计算流体软件,模拟分析建筑在不同送风速度下人体活动区的温度场、速度场,评价控制区域的热舒适性.模拟研究结果表明,在层状送风条件下,房间在垂直方向上出现明显的热力分层.热力分层以距地面0.9 m高的水平面为分界线;人体活动区域以上部分温度高,人体活动区温度低;在人体活动区域,头部位置温度最低,脚部温度最高;这样的热力分层符合建筑节能和人体热舒适性要求.送风速度在0~0.8 m/s的范围内,控制区域内的热舒适度相对较高,送风可及性好,新风可以很好的送到人体呼吸区,有效的提高呼吸区的空气品质.

This paper studies the effect of indoor thermal environment by air velocity from the stratum ventilation system in a typical office building. The CFX calculation software was used to study the temperature field, velocity field in human active area and thermal comfort in control area which was evaluated in different air supply velocities. Results show that the room appeared thermal stratification obviously in the vertical direction under the condition of stratum ventilation. The thermal stratification plane was located at the level of 0.9 m above the ground. In human active area, the room temperature of the zone over human acive area was higher than that in the human active area. And the temperature of human head was the lowest and that of the human foot was the highest in the human active area. The thermal stratification met the requirements of building energy conservation and thermal comfort of human body. The thermal comfort in control area was high when the range of supply air velocity was 0 ~ 0.8 m/s and fresh air could be effectively sent to the breathing area, thus the air quality of the breathing zone was improved.