太阳能制冷机组通风系统中粮库温度的系统分析

SYSTEMATIC ANALYSIS ON GRAIN STORAGE TEMPERATURE IN SOLAR REFRIGERATION UNIT VENTILATION SYSTEM

针对不同的粮库内部太阳能制冷机组空调分布形式,利用CFD计算软件,采用标准k-e模型对粮库内部的大空间气流组织的非稳定特性进行三维数值模拟,分别比较了集中辐射式分布和沿四壁周向式分布两种形式的粮食表面附近的截平面的速度和温度分布,模拟结果显示:采用集中辐射式分布的模型流场扰动范围大,换热效果好,温度场分布均匀,整体降温效果好。由此可以看出流体计算技术在研究空调换热空间速度场和温度场分布的巨大作用,为空调的设计运行参数提供了重要依据,从而可以选用换热效果更好的空调分布形式。

In view of the different distribution form of solar energy air conditioning refrigeration unit in the interior grain depot, using CFD software and standard k--e model, we make the 3--D numerical simulation on the air distribution characteristics of the nonstationarity in the internal large space of grain depots, compare respectively the temperature and velocity distribution near the grain surface of the radiation type and four wall type, the simulation results show that the radiation type model have bigger disturbance range of the flow field, better heat exchange efficiency, better uniform distribution of the temperature field and the better whole cooling effect. We can see the great effect of this fluid calculation technology on the velocity field and temperature field distribution of heat exchange research space in the air conditioning and it provides an important basis for operation parameters of air conditioning design, from which we can choose the air conditioning distribution form with the better heat transfer effect.