整体式太阳能空气集热器热性能研究

Thermal Performance Research of the Integral Solar Air Collector

对一种新型的整体式太阳能空气集热器,根据简化的物理模型利用CFD软件对集热器内部的流场、压力场和温度场进行数值模拟分析,并与传统拼装式集热器阵列进行对比。结果表明,传统拼装式集热器阵列内部存在流动的滞留区,内部温度分布不均匀,吸热板有局部的高温区域;整体式空气集热器内部流场、压力场和温度场分布比较均匀,有明显的温度梯度,吸热板与空气能够更好的进行对流换热。因此,整体式空气集热器的热性能优于传统拼装式空气集热器阵列。

A new type of integral solar air heat collector is introduced in the paper.According to a simplified model,a CFD software is applied to simulate the fields of flow,pressure and temperature.It is shown that in comparison with the integral solar air heat collector,there is a stagnation zone of flow in the inner part of the traditional assembly arrayed collector,the inner temperature distribution is not uniform,and there are also local high temperature zones on heat absorbing plates.The distributions of inner flow field,pressure field and temperature field are more uniform in the proposed one,the temperature gradient is obvious,and the effect of convective heat exchange between heat absorbing plates and air is better.So the heat property of the integral solar air heat collector is better than that of the traditional assembly arrayed air collector.