臺灣博碩士論文加值系統

R22冷媒具有破壞臭氧層的效應將被禁止使用，而取而代之的將是冷媒不會破壞臭氧層的新一代環保冷媒，如R407C與R410A。
本研究以數值分析方法探討使用R407C與R410A冷媒於空調系統毛細管內時之流動特性，由於其為非共沸姓冷媒，因此介穩態區將不存在，流動過程只分為過冷液區及二相區，由於各成分沸點的不同，在二相區內存有溫度滑差的現象，因此需結合道爾吞分壓定律及羅德士定律以解出各成分汽化濃度及剩餘液體內之濃度。只要在背壓夠低的情況下毛細管出口會達到阻流狀態，此時之冷媒流量稱為阻流流量。由於阻流流量大小與膨脹過程相關且易於被量測，因此適合於以此作為模擬計算與實驗之精度比對指標。入口形阻修正後，可提高數值模擬精度。改以壓力陡降之判別式做為阻流發生的依據可以降低累積誤差，更將平均誤差值縮減為5%以內。

第1章 導論 1
1.1 前言 1
1.2 文獻回顧 1
1.2.1 毛細管相關的文獻回顧 1
1.2.2 毛細管數值方法的文獻回顧 3
1.3 研究目的 5
第2章 替代冷媒與毛細管 7
2.1 替代冷媒 7
2.2 毛細管 9
第3章 毛細管流理論模式分析 14
3.1 前言： 14
3.2 理論模式一：純質冷媒毛細管流 15
3.2.1 基本假設 15
3.2.2 統御方程式 16
3.2.3 邊界條件 20
3.2.4 阻流現象的判斷 21
3.3 理論模式二：混合冷媒毛細管流 22
3.3.1 基本假設 22
3.3.2 非共沸冷媒在飽和態乾度之計算 23
3.3.3 統御方程式 32
3.3.4 邊界條件 34
3.4 自由膨脹理論 35
3.5 最大阻流量判定 36
第4章 毛細管流之數值計算 38
4.1 前言 38
4.2 數值方法 39
4.2.1 解析過程 39
4.2.2 步驟與流程 40
4.3 結果與討論 46
4.3.1 毛細管元件之特性分析 46
4.3.2 實驗及文獻的比較 48
第5章 不同流質在毛細管流之差異比較 54
5.1 前言 54
5.2 熱力性質比較 54
5.3 毛細管性能分析 55
5.4 R410A應用於空調機之設計考量 57
5.5 結果與討論 57
第6章 結論與建議 59
6.1 結論 59
6.2 建議之未來研究方向 59

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