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標題: | 迴路熱管之穩定度分析研究 Study of Stability Analysis of Loop Heat Pipes |
作者: | Po-En Yang 楊博恩 |
指導教授: | 黃秉鈞 |
關鍵字: | 迴路熱管,穩定度, loop heat pipe,stability, |
出版年 : | 2012 |
學位: | 博士 |
摘要: | 本研究旨在探討迴路熱管的穩定度,包括啟動問題及對熱傳性能的影響等,先推導各元件的能量和動量方程式,加以整合成迴路熱管的動態統御方程式,即可得迴路熱管的動態模型。將迴路熱管的動態模型轉換成迴路熱管轉移函數,利用轉移函數的極點位置,判別不同迴路熱管設計的穩定度,並透過實驗證明穩定度分析結果的準確性。除此之外,針對特定的迴路熱管設計,藉由改變工作流體充填量這項參數,代入迴路熱管的動態模型中,利用判別轉移函數的極點位置,求出迴路熱管的最低工作流體充填量,並由實驗找出最佳熱傳性能的充填量。本研究也利用迴路熱管各元件壓損分析,求得最低的毛細結構毛細力必須大於各元件的壓損總和,作為迴路熱管基本設計條件。
本研究設計三種以迴路熱管散熱的LED燈具,並利用上述的動態系統分析進行驗證,結果皆證明前面所建立的動態模型是準確的。另外藉由動態系統分析和實驗驗證可知,迴路熱管以向上或水平姿態進行運作時,其最佳傳熱性能的充填量比Maidanik所提的充填量公式還少。未來對迴路熱管的不同應用,皆可用此分析方法求得最佳設計,可快速掌握迴路熱管的設計與產品開發。 The purpose of this study is to investigate the stability of loop heat pipes, including: start-up problems and the performance etc.. Through the derivation of energy and momentum equations of each component of loop heat pipes, the dynamic governing equations of loop heat pipes are integrated ,and then the physical parameters of loop heat pipes are into the dynamic governing equations to get the dynamic model of loop heat pipes. The dynamic model of loop heat pipes is converted into the transfer function of loop heat pipes. By the pole position of transfer function to judge the stability of loop heat pipes, and through the experiments to prove the results of stability analysis are correct. In addition, by changing the parameter which is the charging volume of working fluid into the dynamic model of loop heat pipes to get the different transfer function. To distinguish the pole position of transfer function to find the best charging volume of loop heat pipes(best performance). To establish the pressure loss equations of each component of loop heat pipes in the analysis of capillary force, and when the capillary force of capillary structure is greater than the sum of pressure loss of each component, the loop heat pipes can start up and work successfully. The study also selects three kinds of LED lamps combined loop heat pipes to be thermal cooling modules for LED lights, and uses the aforementioned best design of capillary force and charging volume to analyze and verify. In the results, there are good performances for loop heat pipes used in LED lamps and it also proves that the aforementioned dynamic model is correct. In the future, using the approach to find the best charging volume and capillary force can reduce the time and cost in several experiments. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/66390 |
全文授權: | 有償授權 |
顯示於系所單位: | 機械工程學系 |
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