- 學位論文
創新型LED檯燈散熱鰭片之設計分析與製作
Design and fabrication on a novel heat sink of a LED lamp
摘要
發光二極體(Light-Emitting-Diode，LED)屬於一種高熱通量的元件，發光時約有70%~85%轉換為熱，且LED 晶片越做越小，極小的面積所產生的熱通量也就越來越高，倘若散熱模組設計不佳，將會導致LED上的溫度隨著時間越來越高，進而使得LED 亮度降低、壽命降低，所以散熱模組的設計成為了一大關鍵。有鑑於此，本研究透過計算流體力學軟體模擬LED 上肢散熱鰭片在常溫下(20℃)的散熱情形，透過模擬將流場可視化，找出使得LED 檯燈散熱鰭片具有良好散熱效果的幾何形 狀。 本研究利用全因子法控制厚度及間距兩個參數，並找出散熱效果較佳的一組，最後在鰭片上兩側各設計12 個散熱孔，使得下方空氣得以輕易的流通，更能降低LED 的溫度。根據LED 的溫度特性，溫度每上升10℃，光通量下降約6%，而壽命約減少50%，本研究所設計具有散熱孔的散熱鰭片，可使得LED 的壽命較無散熱孔散熱鰭片的LED 壽命高約40%，並讓光通量較無散熱孔散熱的LED 的光通量高約4.2%。
並列摘要
Light-Emitting-Diode (LED) is a high heat flux lighting devices.Light from LED converts 70% ~ 85% energy to heat losses when operated. Recently, LED chips is made as small as well, so its heat flux is getting higher due to smaller surface area. If the thermal module of LED is not well designed, the corresponding high temperature in LED will lead to reduction in its brightness and life time. Hence, the design of thermal module of LED becomes a key technology. In view of this, this study employs omputational fluid dynamics (CFD) software to simulate thermal sink of LED device at the case of ambient temperature (20℃) and visualize thermal flow fields. It is anticipated that the better geometrical configuration of heat sink for a LED lamp can be explored. In this study, we conduct the full-factorial design to apply two factors of the thickness and spacing of the heat sink to identify a group with better cooling effect. Finally, we have added twelve holes to make the air pass the fins of heat sink easier than that without holes. With this design, the temperature of LEDs can be reduced.According to the temperature characteristics of LED, if its temperature rises 10℃, its luminous flux will decrease by about 6%, and its life expectancy by 50%. Therefore,heat sink with holes in this study has the chance to increase LED’s life about 40% longer as compare with without holes. Besides, luminous flux of LED with heat sink with holes is 4.2% greater than without holes.