太阳墙内部流动及传热规律

目的研究太阳墙内部各断面温度及空气流速的分布情况及影响因素，为优化太阳墙结构性能和运行节能提供基础和保障．方法建立太阳墙的三维模型，应用计算流体力学软件FLUENT的Realizable k-ω模型，对太阳墙系统不同出口速度工况进行数值模拟，分析太阳能新风墙内部宽度方向断面平均温度分布、高度方向断面平均温度分布以及平均空气流速分布，进而得出太阳能新风墙内部空气流动及传热情况．结果太阳墙系统内部各断面的温度分布随太阳墙小孔位置的分布而波动；太阳墙新风系统宽度方向各断面温度分布趋于均匀；高度方向各断面平均温度随着高度的增加波峰值及波谷值均有所下降，出口风速的增大使高度方向各断面温度分布趋于均匀；垂直于高度方向各断面的平均空气流速随高度升高整体呈上升趋势，而处于空气流动方向改变的区域垂直于断面的平均空气流速骤降．结论CFD数值模拟的方法研究太阳墙内部流动及传热规律是可行的．

Air Flow and Heat Transfer inside the Solar-Wall

In order to optimize structural performance and provide guarantee for energy conservation operating of the solar-wall, this article analyzed the distribution of temperature and air velocity inside the solar-wall,as well as its influencing factors. A 3D flow and heat transfer model of the wall fresh air system was established to simulate conditions of different air supply velocities, distributions of temperature and air velocity inside the solar-wall with the help of Realized k-ω model in software FLURENT. Results show that the temperature inside the solar-wall changes with variation of the holes position. Furthermore, on the width direction sections the temperature varies with the absorbed solar radiation intensity, while on the highly direction sections the peak and valley value of the average temperature are both declined along the increase of height. However increase of air supply velocity weakens the effects of solar radiation and uniforms the air temperature in highly direction. The average air velocity presents an upward trend from the bottom to the top, yet a dramatic decline is observed on the area where air flow direction changes. In summary, it is feasible to apply the CFD method to study the air flow and heat transfer inside the solar-wall.