Thermal Analysis of a High Power MR16 LED Lamp

• Main Authors: I-Pin Chia, 賈翊平
• Other Authors: Yeeu-Chang Lee
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/28957362179109210179

碩士 === 中原大學 === 機械工程研究所 === 98 === Abstract Light emitting diodes (Light Emitting Diode, LED) are well-known for the new generation of light source. However, thermal dissipation is a critical problem for the application of LEDs. If the heat cannot be taken away adequately, this thermal problem will lead to high junction temperature which will reduce the luminous flux and also reduce the lifetime of LEDs. For the market demand, how to develop high power LED lamps and also provide thermal solutions become the critical issue in LED research. In this study, I will do the thermal analysis of MR16 LED lamps. For low power (3~5 W) MR16 LEDs, heat dissipation could depend on the natural convection only, but for higher power MR16 LEDs, natural convection is not strong enough to overcome serious thermal problem. The purpose of this paper focuses on the thermal analysis of MR16 LED lamps and discusses thermal effects of MR16 LEDs under natural convection or forced convection by using numerical simulation method. First, without changing the number of fins I investigated how the location and size of opening of fins influence the junction temperature for the low power MR16 LEDs. Second, I added a micro-cooling fan to enhance the heat transfer to investigate the effect of forced convection on high power MR16 LEDs. From the numerical simulations, number of fin, gas flow rate of micro-fan and lamp power were discussed to understand the junction temperature. Finally, we hope to find out the best cooling design MR16 LEDs.