- 學位論文
不同的散熱鰭片幾何形狀及材料對LED嵌燈之熱傳影響分析
A Heat Transfer Analysis of a LED Lamp with Different Fin Array Patterns and Materials
摘要
本文使用計算流體力學套裝軟體Fluent/Icepak®模擬高功率LED嵌燈模組，係以實驗及模擬相互比較，確定嵌燈之基本參數。藉以改變嵌燈之散熱鰭片幾何形狀與材質，分析嵌燈之散熱鰭片溫度。 本文嵌燈使用之LED總功耗為6.4瓦，光通量為400流明，色溫大約在3000K左右，即暖白光。將嵌燈模組搭配三種鰭片，方柱型鰭片、平板型鰭片以及四方形孔洞鰭片，再加以改變材質，陶瓷材料與鋁質材料。分析上述設計六種的散熱鰭片，何種搭配能使鰭片溫度降至最低。 結果顯示陶瓷材料搭配四方形孔洞鰭片能有最好的散熱效果，改變鰭片的間距與高度都能使嵌燈有明顯的降溫。而鋁材只有在鰭片高度增長能使嵌燈有明顯的降溫效果，幾何形狀與鰭片間距的改變則差異不大。可探究影響陶瓷材料之溫度是熱輻射效應所決定，鋁材則是由熱對流效應所決定。
並列摘要
A high power LED lamp module was simulated by the CFD (Computational Fluid Dynamics) Package Fluent/Icepak in the present study. The basic operating parameters of the lamp were determined by comparing the measurement and simulation data. The temperature distributions of the heat sink used in the lamp were simulated and analyzed by varying the fin shapes and materials of the heat sink. The power consumption, light flux and the color temperature of the LED lamp are 6.4 watt, 400 lumens and 3000 K, respectively. Three types of heat sinks, which are square pin fins, plate pin fins and square shaped aperture fins, and two materials, ceramic and aluminum were used in the study. Consequently, six heat sink design conditions of the LED lamp were analyzed to obtain the best combination which has the lowest heat sink temperature among these cases. The results showed that the ceramic heat sink with square aperture fins has the best heat dissipation performance, and both the gap between the fins and the height of the fins also showed significant effects on the heat transfer performance. However, only higher fins have significant effect on the heat transfer performance of the aluminum heat sink. The influence of the shapes and gap of the fins were insignificant. The major difference of the effects on the heat transfer performance of two materials was that the heat transfer of the ceramic heat sink was dominated by radiation, and for the aluminum one was mainly by convection.