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研究生:林俊傑
研究生(外文):Jun-Jie, Lin
論文名稱:裂口鰭管式熱交換器性能研究
論文名稱(外文):Performance analysis of slit fin Fin-and-Tube Heat Exchanger
指導教授:謝文健謝文健引用關係
指導教授(外文):Wen-Chien, Hsieh
學位類別:碩士
校院名稱:國立勤益科技大學
系所名稱:冷凍空調系
學門:工程學門
學類:其他工程學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:中文
論文頁數:73
中文關鍵詞:裂口鰭片鰭管式熱交換器鰭片節距管徑
外文關鍵詞:slit finfin and tube heat exchangerfin pitchdiameter
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本研究以數值方法模擬鰭管式熱交換器,討論單管排、雙管排熱交換器,比較平板、單裂口與雙裂口三種鰭片以及1.21㎜與2.5㎜兩種鰭片節距,同時將風速由0.25m/s增加到6.5m/s以觀察不同鰭片在不同節距、風速下的熱傳與壓降特性,經由數值模擬分析鰭片、以了解不同位置鰭片裂口與裸管在整個熱交換器的熱傳貢獻。文中並變換兩種管徑管徑9.88㎜、7.6㎜與管距Pt、Pl以了解鰭管式熱交換器使用小管徑管子在空氣側的熱傳壓降影響。
結果顯示不論單裂口或雙裂口鰭片均可以提升鰭管式熱交換器的熱傳量,但亦會同時增加熱交換器的壓降,因此增強鰭片較適於大鰭片節距與高風速時,鰭片型式在低風速下對熱交換器影響不大。熱交換器中的裸管面積對熱交換器熱傳量的貢獻低於10%,因此適當的縮小管徑可有效的降低熱交換器的壓降但維持相對的熱傳量。

The fin and tube heat exchangers with staggered tube are investigated numerically in the study. The parameters studied include row number, fin type, slit fin division number and fin pitch. The inlet air velocity is increased from 0.25m/s to 6.5m/s to examine the parameter influences upon heat transfer and pressure drop under different air velocity. The effects of offset strip and tube in different row upon heat transfer are also analyzed through numerical simulation particularly to provide understanding of the heat transfer mechanism of an offset strip fin-and-tube heat exchangers.
To study the scale effect of heat exchanger, the tube diameter are scaled down proportionally to tube pitch from 9.88㎜ to 7.6㎜. The results show that the slit division numbers and tube row number will increase the heat transfer rate, but will also increase the pressure drop. The fin offset strip and tube row number have more distinctly heat transfer effect in the high air velocity and large fin pitch. The heat transfer enhancement of slit fin is dominantly through the fin, the primary tube surface has limiting effect on heat transfer despite of the fin type.

摘 要 i
ABSTRACT ii
誌 謝 iii
目 錄 iv
表 目 錄 vi
圖 目 錄 vii
符 號 說 明 xi
特 殊 符 號 xiii
下 標 xiii
第一章 緒論 1
1-1前言 1
1-2文獻回顧 1
第二章 熱交換器基本熱傳理論 4
2-1熱交換器基本原理 4
2-1-1 基本熱傳介紹 4
2-1-2 壓降計算與分析 6
2-2熱交換器各部分面積定義 7
2-3熱交換器之熱傳特性 9
2-3-1平板型鰭片之熱傳因子j與摩擦因子f的實驗關係式 10
2-3-2裂口型鰭片之熱傳因子j與摩擦因子f的實驗關係式 11
2-4 ε-NTU分析法介紹 12
2-5鰭片效率 與表面效率 推導 14
第三章 數值方法 19
3-1物理模型 19
3-2使用軟體STAR-CD簡介 24
3-3 STAR-CD數學方程式 24
3-4網格模型 25
3-5網格測試 26
3-6數值模擬與文獻實驗結果比較 27
第四章 結果與討論 33
4-1熱交換器熱傳與壓降分析 33
4-2裂口鰭片熱傳分析 44
4-3管子對熱交換器的影響 64
第五章 結論 69
第六章 參考文獻 70

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