不同形式冷库空气幕性能对比分析

Comparison analysis of different forms of cold storage air curtain

为降低库门处因货物进出造成的冷损失,在冷库库门处加装空气幕,隔绝外部热空气向库内渗透。采用Fluent数值模拟软件分别对上送风式、单侧送风式、垂直循环式、水平循环式空气幕进行速度场和温度场的模拟分析。结果表明,不同形式的空气幕受垂直方向的热压会造成射流的偏转。空气幕运行30 s,上送风式、单侧送风式、垂直循环式、水平循环式四种空气幕效率分别为:69.30%、29.43%、77.97%、31.78%。相比不带回风收集的空气幕,带有回风收集装置的循环式空气幕效率更高,四种空气幕中垂直循环式空气幕性能最优。

In order to reduce the cold loss caused by the entry and exit of goods at the door of the cold storage, an air curtain was installed at the cold storage door to isolate the infiltration of external hot air into the cold storage. Fluent numerical simulation software was used to simulate the velocity and temperature fields of the upper air supply type, single-side air supply type, vertical circulation type and horizontal circulation type air curtain respectively. The results show that different forms of air curtains are subject to vertical heat pressure, which will cause jet deflection. The air curtain operates for 30 s, and the efficiencies of the upper air supply type, single side air supply type, vertical circulation type and horizontal circulation type air curtain are 69.30%, 29.43%, 77.97% and 31.78% respectively. Compared with the air curtain without return air collection, the circulation type air curtain with return air collection device is more efficient, and the vertical circulation type air curtain has the best performance among the four types of air curtains.