送风参数对竖壁贴附射流夜间通风降温效果的影响

The Influence of the Supply Air Parameters on Cooling Effect of the Wall-mounted Attached Night Ventilation

针对成都地区湿热的气候特征,采用竖壁贴附射流夜间通风的方式冷却墙体内壁面。选取夏季典型日气象参数进行数值模拟并分析降温效果。研究了不同送风速度和夜间通风时段下该夜间通风系统的降温效率。研究表明,送风速度为4m/s,夜间通风开启时间为23:00,壁面温度效率较高,竖直向壁面的对流换热系数为18W/m~2·K;继续增大风速,温度效率和换热系数不会有明显改变。

In view of the humid and hot climatic characteristics of Chengdu,the wall inner surface is cooled by means of wall-mounted attached night ventilation (WANV).Typical daily meteorological parameters in summer are selected for numerical simulation and the cooling effect is analyzed.The cooling efficiency of the WANV system was studied under different supply air velocities and night ventilation periods.The results show that the supply air velocity is 4m/s,the night ventilation opening time is23:00,the wall temperature efficiency is high,and the convective heat transfer coefficient of the vertical wall is 18 W/m~2·K.Continue to increase the supply air velocity,temperature efficiency and heat transfer coefficient will not change significantly.