以形狀因子為基礎之快速熱阻估算法

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姓名

黃柏諭(Bo-Yu Huang) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

以形狀因子為基礎之快速熱阻估算法

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摘要(中)

本研究利用形狀因子(Shape factor)為基礎，搭配有限元素分析(FEA)模擬軟體建立三維軸對稱模型，並整理出其形狀因子與幾何形狀之關係圖，經數學式擬合後建立快速熱阻估算法，快速熱阻估算法不僅可應用於軸對稱式結構之熱阻計算，更可應用於複合式結構、方形結構與非對稱式結構等熱阻計算，最後搭配模擬退火法優化一實際燈具之熱阻。快速熱阻估算法不僅可以有效且迅速的估算物體之熱阻，也可大幅減少燈具設計階段之時間、人力與金錢的消耗。

摘要(英)

In this research, shape factor is regarded as basis and finite element analysis (FEA) software is used to build the three-dimensional axisymmetric model, and then find the figure related to shape factor and geometric shape. After fitting the curve of figure, the rapid estimation of thermal resistance method is built. The rapid estimation of thermal resistance method can apply to not only axisymmetric structures but also composite structures, square structures and asymmetric structures. Finally, the thermal resistance of an actual LED thermal module will be optimized by simulated annealing. The rapid estimation of thermal resistance method cam not only estimate the thermal resistance of the sample effectively and rapidly but also reduce the time, manpower and money during the period of design.

關鍵字(中)

★ LED
★ 形狀因子
★ 熱阻計算
★ 模擬退火法
★ 有限元素分析法

關鍵字(英)

★ LED
★ Shape factor
★ Thermal resistance
★ Simulated annealing
★ Finite element analysis

論文目次

摘要 i

Abstract ii

致謝 iii

圖目錄 vii

表目錄 xi

第一章緒論 1

1-1 前言 1

1-2研究動機 3

第二章基礎理論 5

2-1 引言 5

2-2 熱傳遞基本理論 5

2-2-1 傳導 6

2-2-2 對流 7

2-3 熱阻 8

2-4形狀因子(Shape factor) 10

第三章形狀因子之模型建立與模擬分析 12

3-1 COMSOL Multiphysics軟體分析流程 12

3-2 形狀因子之三維軸對稱模型建立 13

3-3 模擬分析與擬合數學式推導 16

3-3-1 模擬結果分析 16

3-3-2 有效物體半徑定義 17

3-3-3 形狀因子與熱阻之擬合數學示推導 20

3-4 單一結構之熱阻計算與驗證 23

3-4-1 改變物體熱傳導係數 23

3-4-2 改變物體厚度、物體半徑與熱源半徑 24

3-5 複合式結構之熱阻計算與驗證 25

3-6 方形結構之熱阻計算 31

3-7 方形不對稱結構之熱阻計算 34

第四章以模擬退火法進行複合式結構之熱阻最佳化計算 37

4-1 引言 37

4-2 模擬退火法 37

4-2-1模擬退火法簡介 37

4-2-2模擬退火法流程 38

4-2-3模擬退火法之驗證 40

4-3 運用實際燈具散熱模組進行最佳化處理 41

第五章結論 46

參考文獻 48

參考文獻

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指導教授

鍾德元(Te-Yuan Chung)

審核日期

2015-8-28

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