基于CFD技术的中庭建筑空调送冷风的气流组织优化

Optimization of cooling air distribution of air conditioning in atrium building based on CFD technology

针对当前中庭建筑空调送冷风的气流组织设计不太理想状况,提出利用CFD软件对中庭空调气流组织进行数值模拟,得到中庭气流速度、温度和湿度三场分布并进行合理的评价,提出改进中庭建筑空调气流组织的方案。发现由于中庭下层气流浮升会导致顶层温度严重偏离设计工况,基于此提出2种改进措施:增大下层回风口面积,以增大下层回风量;调整各层送风比例,将下层设计风量部分调整至上层。结果表明:增大下层回风面积50%后能使顶层温度下降0.7℃;风量调整比例达10%和20%能分别使顶层温度下降1.2℃和1.3℃。2种措施能改善顶层温度工况,使其更加接近设计工况。

Regarding existing unsatisfactory in the airflow distribution design of cooling air-conditioning in the atrium building,the CFD software wasproposes to numerically simulate the air conditioning in the atrium in order to obtain three distributions of air velocity,temperature and humidity in the atrium before making a reasonable evaluation and putting forward a scheme to improve the air distribution of atrium air conditioning.Itwasfound that due to the buoyance lift of airflow from the ground floor,the temperature of the top floor will seriously deviate from the design condition.Based on this,two improvement measures were put forward:increasing the area of the return airport in the bottom floors to increase the return air volume in the bottom floors;adjusting the supply air proportion in each floors by transferring the air volume rate in the lower floors to the upper floors.The results showed that the temperature of the top floor can be reduced by 0.7℃by increasing the return air area of the bottom floors by 50%;the top layer temperature can be reduced by 1.2℃and 1.3℃by adjusting the air volume ratio by 10%and 20%.The two measures can improve the temperature condition of the top floor and make it more close to the design condition.