CAJ | 학술논문

近年来由于节能减排的议题,低耗能的LED光源受到极高重视,其中高功率LED本身最大的难题在于散热,过高的温度会降低LED的发光效率、寿命,甚至使颜色改变.然而不论是传统的散热技术,或是较新型的散热技术,在设计LED灯具上,皆难以降低成本使其普及大众,因此发展新的散热技术一直是重要的议题.本研究将利用蜂巢结构与自然对流散热的优点,结合烟囱效应,开发出特殊的散热方式,即蜂巢式散热鳍片.研究分析的方式主要利用CFD-RC软件包进行模拟,并配合实验做验证.研究发现,对散热效能影响最大的是高度,理想的高度选择约在6～10 mm,可以解的瓦数为13～14 W,而重量为75～125 g,再配合本研究特殊设计,重量还可以再减轻1/3,且几乎不影响散热效能.
근년래유우절능감배적의제,저모능적LED광원수도겁고중시,기중고공솔LED본신최대적난제재우산열,과고적온도회강저LED적발광효솔、수명,심지사안색개변.연이불론시전통적산열기술,혹시교신형적산열기술,재설계LED등구상,개난이강저성본사기보급대음,인차발전신적산열기술일직시중요적의제.본연구장이용봉소결구여자연대류산열적우점,결합연창효응,개발출특수적산열방식,즉봉소식산열기편.연구분석적방식주요이용CFD-RC연건포진행모의,병배합실험주험증.연구발현,대산열효능영향최대적시고도,이상적고도선택약재6～10 mm,가이해적와수위13～14 W,이중량위75～125 g,재배합본연구특수설계,중량환가이재감경1/3,차궤호불영향산열효능.
Previous studies show that the lighting quality of LED largely depends on operating temperature. LED without thermal management may fail early due to thermal runaway, epoxy degradation, and thermal stress under high-operating temperatures. In this study, the performance of a honeycomb heat sink was investigated by experimentation and three-dimensional numerical models. Two kinds of honeycomb models were proposed to demonstrate the performance of a heat sink with single and multiple heat sources for LED thermal management. The performances of innovative honeycomb heat sinks depend on the number of cells, aspect ratio, and the rib-space ratio. The simulated results indicated that the performance varies a little when the conductivity is over 50 W/(m·K-1). Compared to the simulated heat flux ratio 0. 95, the measured heat flux ratio 0. 93 at θ=30° was slightly lower. The measured performance of the lump and stack (5 pieces) honeycomb heat sink can respectively keep 13. 761 W and 13. 338W under the dummy heater at 67℃ and the ambient temperature at 27℃. The innovative design with nine pieces of layers that are drilled to reduce their weight can effectively dissipate the heat by natural convection in the application of a high-power LED street lamp.