NUMERICAL OPTIMIZATION OF LUMINAIRES LEVEL HEAT DISSIPATION STRUCTURE FOR LEDS UNDER NATURAL CONVECTION

Wu Ke, Wang Le, Yu Yi-Bo, Sun Da-Ming, Huang, Zhi-Yi, Gu Pei-Fu

Abstract

Improving heat dissipation performance of LED lamps is of great significance to large-scale application of LED. The method of opening was adopted to modify the luminaires level heat dissipation structure in this study. Furthermore, natural convection heat rejection of LED lamp was simulated by computational fluid dynamics (CFD) method before and after the structural modification. As shown by computational results, opening was prone to forming bottom-up natural convection and achieved the goals of eliminating local circulation and improving heat transfer performance. Under the same computational condition, the highest temperature of radiator decreased by about 8 ℃ and average heat transfer coefficient increased by 43.3%. Analysis based on field synergy principle indicated that opening improved the synergy between flow field and temperature field, and effectively decreased the heat resistance of radiator of the same heat transfer area.

Keywords

LED, Computational fluid dynamics, Luminaires level Heat Dissipation Structure, Field synergy principle, natural convection

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IMEKO-TC2-2010-12.doc

DOI

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IMEKO TC

TC2 - Photonics

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