平板集热器闷晒工况排管内部换热模拟研究

Numerical Simulation Study on Heat Transfer Inside of the Flate Plate Solar Collector Tube in Sunning Heat Stage

通过数值模拟发现,在太阳能定温差循环系统中的闷晒加热阶段,平板集热器排管中存在两种传热形式,分别是对流换热和热传导。在不同排管管径和不同的使用倾角下,当排管内介质升温相同时,研究对流换热和热传导的相对强弱程度。得出随着排管管径的增大,管内对流逐渐占据主导地位;随着集热器倾角的增大对流换热先增强后减弱;当集热器排管管径较大时集热器倾角是换热系数的一个显著影响因素。

The paper applied numerical simulation to study sunning heat stage in the solar constant tem- perature difference system. It＇s found that the convection heat transfer and heat conduction exsit in the presence of flate plate solar collector tube. When medium final temperature is the same, relative degree between convection heat transfer and heat conduction are studied in a different tube diameter and different angle. It concludes that convection heat transfer in the tube gradually dominated as the increase of the pipe diameter;and it becomes increased and then decreased as the increase of couectorg argle. The angle of collector plays a significant role on the condition of biggish pipe diameter.