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为解决LED筒灯使用单纯自然对流散热扩散热阻过大、温度分布不均的问题,提出一种基于平板热管和热虹吸管的复合结构热管散热器,并用数值模拟的方法研究了热功率、翅片高度、翅片数目、辐射换热对该散热器性能的影响。模拟结果表明应用于LED筒灯的复合结构热管散热器的热阻随着热功率的增加而减小,翅片高度和翅片数目存在一个最优值,使得散热器温度和热阻最小,自然对流情况下不可忽视辐射换热的作用。
In order to solve the problem that the heat resistance of LED downlight is too large and the temperature distribution is not uniform, a new heat pipe radiator based on flat heat pipe and thermosyphon is proposed. The heat power, The height of the sheet, the number of fins and the effect of radiation heat transfer on the performance of the radiator. The simulation results show that the thermal resistance of the composite heat pipe radiator used in the LED downlight decreases with the increase of the thermal power. There is an optimal value for the fin height and the number of the fins so that the temperature and the thermal resistance of the radiator are minimized. Convection can not ignore the role of radiation heat transfer.