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研究生： 吳俊億
論文名稱： 磁制冷卻系統之性能模擬研究
指導教授： 許文震
口試委員: 王訓忠
簡國祥
學位類別： 碩士
Master
系所名稱： 工學院 - 動力機械工程學系
Department of Power Mechanical Engineering
論文出版年： 2013
畢業學年度： 101
語文別： 中文
論文頁數： 83
中文關鍵詞： 磁致冷
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    • 本研究主要目的在於利用數值模型模擬方式討論平板式磁致冷裝置AMR(active magnetic regenerator)在各種參數下其性能表現。使用套裝軟體COMSOL來模擬計算AMR統御方程式，方程式由流體部分能量方程式和固體部分能量方程式構成，為一組一維暫態偏微分方程式。除了分析AMR內部的熱傳現象，最主要的目標是找出在限制條件下，如何改變操作參數以提升冷凍能力，以及參數變化和AMR性能表現的關係。

    摘要 I 致謝 II 第一章 緒論 1 1-1 前言 1 1-2 磁製冷簡介 3 第二章 理論與文獻回顧 5 2-1 磁熱效應 5 2-1.1 熱力學理論 5 2-1.2 一階相變與二階相變 9 2-2 磁熱材料 10 2-3磁場 16 2-4 磁致冷復熱器（active magnetic regenerator, AMR） 18 2-4.1 AMR循環 19 2-5 AMR能量守恆方程式 21 2-5.1流體部份能量守恆 22 2-5.2材料部份能量守恆 24 2-6文獻回顧 26 2-6.1磁致冷裝置 26 2-6.2 磁致冷裝置（AMR）數值模型 39 第三章 數值模型模擬 43 3-1 模擬軟體介紹 44 3-1.1 COMSOL Multiphysics簡介 44 3-2平均場理論模型（mean field model）與計算 45 3-2.1平均場理論模型（mean field model） 45 3-2.2 求解Gd熱力學性質 47 3-3 模型幾何參數設定 49 3-4 一維AMR統御方程式 50 3-4.1質量流率與磁場控制 52 3-4.2邊界條件 53 3-4.3初始條件 53 3-4.4方程式參數設定 54 3-5 性能評估參數 56 第四章 模擬結果與討論 57 4-1基本結果 58 4-2週期的影響 63 4-3片數的影響 66 4-3.1改變片數對不同溫度差的影響 66 4-3.2改變片數對不同週期的影響 72 4-3.3改變片數對不同U的影響 74 4-4軸向熱傳導的影響 76 第五章 結論 80 參考文獻 81

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