Orientation Effects Experiment on Natural Convection of High Power LED Heat Sink

SHAN Long; HU Xue-gong; WANG Ji-hui; TIAN Hong

doi:10.3788/fgxb20194006.0781

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Orientation Effects Experiment on Natural Convection of High Power LED Heat Sink

Device Fabrication and Physics | 更新时间：2020-08-12

- Orientation Effects Experiment on Natural Convection of High Power LED Heat Sink
- Chinese Journal of Luminescence Vol. 40, Issue 6, Pages: 781-787(2019)
- 作者机构：
  
  中国科学院工程热物理研究所, 北京 100190
- 作者简介：
- 基金信息：
- DOI：10.3788/fgxb20194006.0781
  CLC： TK124
- Received：27 June 2018，
  
  Revised：20 October 2018，
  
  Published Online：15 October 2018，
  
  Published：05 June 2019
- 稿件说明：
移动端阅览
单龙, 胡学功, 王际辉等. 大功率LED散热器自然对流方向效应实验[J]. 发光学报, 2019,40(6): 781-787

SHAN Long, HU Xue-gong, WANG Ji-hui etc. Orientation Effects Experiment on Natural Convection of High Power LED Heat Sink[J]. Chinese Journal of Luminescence, 2019,40(6): 781-787
单龙, 胡学功, 王际辉等. 大功率LED散热器自然对流方向效应实验[J]. 发光学报, 2019,40(6): 781-787 DOI： 10.3788/fgxb20194006.0781.

SHAN Long, HU Xue-gong, WANG Ji-hui etc. Orientation Effects Experiment on Natural Convection of High Power LED Heat Sink[J]. Chinese Journal of Luminescence, 2019,40(6): 781-787 DOI： 10.3788/fgxb20194006.0781.

摘要

为了研究采用微槽群复合相变换热技术的大功率太阳花散热器多角度投光的方向效应及综合散热性能，实验研究了散热器高度、功率以及采用微槽群复合相变换热技术后的过余温度、平均对流换热系数随出光倾角的变化规律，并获得了出光倾角的

与

关联式。研究结果表明:出光倾角小于90时，微槽群散热器热源过余温度大幅低于型材散热器，在高度为90 mm，出光倾角为30，输入功率为80，100，120，200 W时热源温度分别降低了11.6，13.3，18.9，26.7 K，呈现出功率越大降幅越大的趋势；出光倾角大于90时，微槽群散热器热源过余温度略高于型材散热器，原因是微槽群散热器内部的真空环境影响散热器的均温性；输入功率越高，方向效应越明显；散热器高度越低，平均对流换热系数越大，对比高度60 mm与高度90 mm，在出光倾角为0时，功率为80，100，120 W时分别提高了27.5%、23.8%和24.2%。因此，设计LED灯具散热器时应综合考虑散热器的方向效应。

Abstract

In order to study the orientation effects and the comprehensive heat dissipation performance of the high power radiator heat sink with the phase-change heat transfer in capillary microgrooves heat sinks

the experiment studies the variation of height

power and whether using the phase-change heat transfer in capillary microgrooves heat sinks on excess temperature and the mean convection heat transfer coefficient with the installation angles. And the correlations between the

and

are obtained. The results show that when the installation angle is less than 90 degrees

the excess temperature of heat source for microgrooves heat sinks is much lower than that of the section heat sink. When the installation angle is 30 degrees

the height is 90 mm

the input power is 80

100

120

200 W

the heat source excess temperature 11.6

13.3

18.9

26.7 K are reduced respectively

and the greater the input power

the greater the reduction. When the installation angle is greater than 90 degrees

the excess temperature of the microgrooves heat sinks is slightly higher than that of the section heat sink

and the reason is that the vacuum environment inside the microgrooves heat sinks affects the temperature uniformity

the higher the input power

the more obvious the orientation effects. The lower the height is

the greater the mean convection heat transfer coefficient is. When the installation angle is 0

the input power is 80

100

120 W

compared with height 60 mm and height 90 mm

the mean convection heat transfer coefficient increased by 27.5%

23.8% and 24.2%. Therefore

the orientation effects of the radiator should be considered when designing the radiator for LED lamps.

关键词

Keywords

references

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