臺灣博碩士論文加值系統

　 本論文分成兩部分，第一部分之目的乃針對機櫃型空調系統，對於機櫃內部伺服器熱量冷卻需求，進行尺寸設計及性能評估之工作。並依熱交換器之設計理論，以Visual Basic( VB )語言撰寫一套用於個人電腦之交談式電腦輔助設計軟體，將從事空調冷卻盤管熱液動能設計時必須使用的圖表和繁雜計算手續電腦化，讓使用者能輕易且迅速地獲取可靠的計算結果以茲參考利用。並且成功開發機櫃型板鰭管式熱交換器，其冷卻能力為5kW，設計尺寸為長350 mm、寬76.2 mm及高356 mm，熱傳面積為10.7m2，採用56 (14 x 4) 根管子，冷媒側走4個迴流數(Pass)。其程式具備功能如下：
(A) 性能評估問題(Rating problem) : 使用者輸入熱交換器實際尺寸與兩
側流量、進口溫度，則可求兩側氣體泛出的出口溫度（熱傳量）以及兩側壓降。
(B) 尺寸計算問題(Sizing problem) : 當告知兩側流體的流量，進出口溫度（熱傳量）及容許壓力降，則可計算出熱交換器的熱傳面積及尺寸大小。
第二部分則是針對機櫃型冷卻系統進行分析，利用三維計算流體力學( CFD )軟體，分析機櫃內部之流場、溫度場及冷卻負載值，能讓機櫃型機房之設計更加完整。而三維計算流體力學理論所使用的統御方程式包括質量守恆、動量守恆以及能量守恆方程式，並採用 - 紊流模式描述流體的紊流現象，分別探討軸流式與離心式風扇放置於不同位置以及調整冷通道距離大小時，對於機櫃內之熱流場效應。結果顯示使用離心式風扇置於中間位置且冷通道距離為200 mm時，其性能最佳。

There are two parts in this thesis. The first part is about In-Rack cooling system, performance analysis and dimensions design. According to the theory of heat exchanger, the software for computer-aided heat exchanger design is programed in Visual Basic software. It can simplify the calculating process and makes the users get the reliable result easily and fast. The software can apply to
(A) Rating Problem：Predict the performance such as outlet temperature and pressure drop when the dimensions of heat exchanger are given.
(B) Sizing Problem：Determine the necessary size and heat transfer area when the required performance is given.
The second part is that there-dimension model is simulated for the velocity and temperature fields by computational fluid dynamics (CFD) software. It makes the design of In-Rack cooling system more complete. The governing equations are solved by CFD. These equations include mass, momentum and energy conservation equations, and the k-ε turbulence model is used to describe the turbulence phenomenon for fluid. Besides, the effect of velocity and temperature fields is discussed by three methods such as using the axial or radial fan, putting the heat exchanger in different places and adjusting the cold aisle distances. The simulation result indicates that the best performance is to use radial fan and to put heat exchanger in the middle place of cabinet when the cold aisle distance is 200 mm.

中文摘要 I
英文摘要 II
致謝 III
目錄 IV
表目錄 V
圖目錄 VI
符號說明 VIII
第一章 緒論 1
1-1 研究之背景 1
1-2 文獻回顧 3
1-3 研究目的 7
第二章　機櫃型冷卻盤管之電腦輔助設計軟體開發 22
2-1 熱交換器理論分析 22
2-2 電腦輔助設計軟體 30
2-3 實驗與驗證 40
2-4 結果與討論 42
第三章 機櫃熱流場之分析 50
3-1 物理模型 50
3-2 統御方程式 51
3-3 數值分析 57
3-4 結果與討論 60
第四章 結論 83
參考文獻 84

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