臺灣博碩士論文加值系統

隨著高功率LED使用愈來愈廣泛，功率提升使得LED所產生之熱能也愈高，高亮度LED散熱途徑與方法，都會影響LED的發光效能與使用壽命，若能將熱傳效能有效的提升，必能節省能源。
本文主要以數值方法探討三維穩態之LED投影機內部鰭片最佳外型，並藉由改變散熱鰭片幾何外型、流速與LED發光效率等設計，探討鰭片在六組不同的參數作用下，對於整體散熱性能的變化與影響。
由數值分析的結果得知，隨著改變參數不同對紐賽數影響甚大，並發現流道過於密集或疏散，亦會影響散熱效益，紐賽數隨著鰭片距離、厚度、長度與流速的不同而有所變化，因此若鰭片在同流速中能保持適當的比例必能提升鰭片的散熱效果。

Current high power LEDs are used popularly, energy saving can be achieved if the heat transfer performance of a high power LED is increased.
Numerical analysis is carried out herein to study the parameters effect on the cooling performance for the heat sinks of the LED projector. The parameters include fin spacing, fin depth, fin thickness, base thickness and flow speed.
The numerical results reveal that the parameters of the heat sinks significantly affects the average Nusselt Number. The results of this study can provide design references for LED projector.

目錄 I
圖目錄 IV
表目錄 VIII
摘要 IX
Abstract X
符號說明 XI
第一章 緒論 1
1.1 前言 1
1.2 投影機光源介紹 2
1.3 LED散熱關鍵 7
1.4 PhlatLight PT120 LED型號技術參數 8
1.5 文獻回顧 9
1.5.1 熱管散熱分析 10
1.5.2 鰭片散熱分析 10
1.6 研究目的 12
第二章 理論分析 17
2.1 統御方程式(Governing Equation) 17
2.2 無因次化 18
2.3 邊界條件(Boundary Conditions) 19
2.4 數學模型 21
第三章數值方法 36
3.1 模型格點測試 36
3.2 數值方法 36
3.2.1 通用守恆方程式 37
3.2.2 SIMPLEC演算法 37
第四章 結果與討論 42
4.1 鰭片模組參數對熱傳之影響 42
4.1.1 鰭片長度改變之熱傳性能影響 42
4.1.2 鰭片間距改變之熱傳性能影響 43
4.1.3 鰭片厚度改變之熱傳性能影響 43
4.1.4 基板厚度改變之熱傳性能影響 44
4.1.5 流速改變之熱傳性能影響 44
4.1.6 LED發光效率改變之熱傳性能影響 45
第五章 結論與未來展望 83
5.1 結論 83
5.2 未來展望 84
參考文獻 86

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