研究生: |
黃維勇 Wei-Yung Huang |
---|---|
論文名稱: |
液晶電視於自然對流下之熱模擬系統分析 LCD-TV Fanless Thermal Simulation System Analysis |
指導教授: |
林唯耕
Wei-Keng Lin |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
原子科學院 - 工程與系統科學系 Department of Engineering and System Science |
論文出版年: | 2008 |
畢業學年度: | 96 |
語文別: | 中文 |
論文頁數: | 133 |
中文關鍵詞: | 液晶電視 、FLOTHERM 、數值模擬 、輻射 、開孔率 、放射率 |
外文關鍵詞: | LCD-TV, FLOTHERM, Numeriacl Simulation, Radiation, Open ratio, Emissivity |
相關次數: | 點閱:108 下載:0 |
分享至: |
查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
LCD-TV的散熱技術需要持續不斷的開發與研究。隨著LCD-TV的體積與厚度越做越輕薄且發熱功率逐漸增大的情況下,系統內部散熱問題日益嚴重,除了尋求更創新的散熱方案之外,尚需改善原有的散熱設計缺失,進而有效地將廢熱移除於功率逐漸增強的發熱晶片。因此如何正確並有效的使用數值模擬軟體,了解LCD-TV內部散熱狀態以及行為模式,解析並改善其原始的散熱機制,使內部系統與發熱晶片達到理想的工作溫度,為本論文主要的研究方向與目標。
本論文的研究主要偏向於改善LCD-TV系統內部之散熱設計,並以FLOTHERM V6.1數值模擬分析,將其結果整理出一套有效進行LCD-TV散熱設計的分析程序與最佳化方法。將熱流實驗與模擬計算結果做比較,從中細部分析與探討系統中熱量與氣流的傳遞行為模式。並針對設計上的缺失提出具體的改善對策。
經由實驗與模擬分析的結果,我們可以歸納大致歸納以下幾個結論:(1)在自然對流的環境下進行散熱時,輻射為一不可忽略之重要參數。(2)開孔率適當的增加能對系統的散熱有著直接顯著的幫助。(3)單純只增加熱沉的放射率便能有效改善主機板上晶片的溫度。(4)將熱源放置在適當的位置對於系統的散熱能有一定程度的改善。
The heat dissipation technique of LCD-TV is always a subject with continuous research and development needs. It is particularly important toimprove existing methods of heat dissipation and develop new techniquesin the face of improve electronic circuitry efficiencies. In this regard, theobjective of the present thesis is to investigate and discuss the appropriateanalysis of thermal problem in LCD-TV for the purpose of understandinghow and under what conditions heat dissipation occur, in order to achieveimprovements in current heat dissipation techniques, and to attain idealoperating temperature and internal systems heat control.
We began our study by thermal experiments and used the FLOTHERM V6.1 simulation software to provide a basic internal LCD-TV systemthermal analysis. Results of experiments and simulations were used toanalyze current and systems heat flows, which served as the basis for ourrecommendations to improve existing heat dissipation techniques.
Making comparisons between the experiments and simulations analysis, we have arrived at the following conclusions and recommendations.
(1) The heat disipation under the environment of the natural convection, radiation is an very important parameter that can not be neglected.
(2) The proper increase the size of open ratio appropriately, could obvious improve the heat dissipation of the system.
(3) Only increase the emissivity of heat-sink can improve the temperature of the chip on the main-board effectively.
(4) There is very great improvement to the heat dissipation of the system to put the heat source in the appropriate position.
參考文獻
〔1〕 Scott P. Overmann,“Thermal Design Consideration for Portable DLP Projectors”, Texas Instruments Incorporated, 2001.
〔2〕 張世徵,“FLOTHERM在筆記型電腦之熱設計分析與應用”,國立清華大學工程與系統科學系碩士學位論文, 民國90年6月。
〔3〕 Wang, D.G,“Optimization of System Fan Placement”, Proceeding of the 2000 IEMT╱IMC Thermal Management, April, 2000.
〔4〕 Turner, Mike and Rotron, Comair, “All You Need to Know about Fans”, Electronics Cooling, January, 2000.
〔5〕 “Two Fans, Twice the Air Flow?” , Industrial Technology Magazine, April, 2000.
〔6〕 莊書豪、鍾政佑、洪培裕, “小型冷卻風扇性能之研究” , 國立中興大學機械工程學系, 第十九屆機械工程研討會論文集, 2002年11月。
〔7〕 黎俊和,“液晶投影機的發展介紹與對數位光源處理投影機之光機研究”,國立交通大學機械工程系碩士學位論文,民國92年。
〔8〕 陳柏安,“DLP液晶投影機之熱流場數值分析”, 國立台灣科技大學機械工程系碩士學位論文, 民國93年。
〔9〕 張志賢,“投影機之散熱分析與對策”, 國立清華大學工程與系統科學系碩士學位論文, 民國95年。
〔10〕 Suhas V. Patankar,“Numerical Heat Transfer and Fluid Flow?” , Hemisphere Publishing Corporation, 1980.
〔11〕 S.L.LEE and R.Y.TZONG,“rtificial pressure for pressure-linked equation?”, international journal of heat and mass transfer, Vol.35, No.10, pp.2705-2716, 1992.
〔12〕 Flomerics,“How to Use FLOTHERM-Lecture Course” , Flomerics, England.
〔13〕 Flomerics,“FLOTHERM version 6.1-Lectures Notes” , Flomerics, England.
〔14〕 Flomerics,“FLOTHERM version 6.1-Tutorials”,Flomerics, England.