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研究生:梁致誠
研究生(外文):Zhi-cheng, Liang
論文名稱:鰭管式熱交換器裂口性能研究
論文名稱(外文):Analysis of the slit fin performance in 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:2011
畢業學年度:99
語文別:中文
論文頁數:69
中文關鍵詞:鰭管式熱交換器X型裂口鰭片熱傳壓降
外文關鍵詞:fin and tube heat exchangerX type slit finheat transferpressure drop
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本研究以數值模擬針對X型裂口鰭管式熱交換器在不同裂口高度下來進行探討。主要討論在不同管排數(單排、雙排)、鰭片節距(1.21㎜、2.5㎜)與不同裂口高度(1/3Fp、1/2 Fp、2/3 Fp)下,將風速由0.5m/s增加到6m/s以觀察在不同鰭片節距、風速下的熱傳與壓降特性,以了解不同高度鰭片裂口對熱交換器的熱傳與壓降的影響,並在雙排管熱交換器中另外研究前後排不同裂口高度的裂口是熱交換器。
結果顯示,鰭片裂口高度在較小鰭片節距(1.21㎜)有較明顯的影響。單排管裂口高度在二分之ㄧ鰭片節距時,鰭片有最大的熱傳與壓降,裂口高度在三分之ㄧ鰭片節距時,鰭片的熱傳、壓降較低,相較於平板鰭片的熱傳與壓降百分比,熱傳相差10%,壓降相差達20%。在雙排管熱交換器中鰭片裂口高度影響熱傳約7%,壓降約22%的平板鰭片的熱傳與壓降百分比。雙排管混合裂口高度的熱傳、壓降則介於各裂口高度的熱交換器間。
本研究可提供裂口式熱交換器的設計與操作的參考。

The X-type slit fin and tube heat exchangers with different slit highs are studied numerically. The heat exchangers with two rows(single and double), two fin pitches(1.21㎜、2.5㎜) and three different slit highs(1/3Fp、1/2 Fp、2/3 Fp)are considered in the analysis. The air velocities are varied from 0.5m/s to 6m/s to see the effect of wind velocity on the heat transfer and pressure drop of the heat exchangers under different slit high. The heat exchanger with different fin slit highs in the first row and second row is also investigated in the study.
The results show the slit high has more marked effect on the heat exchanger in the 1.21㎜ fin pitch. The single row heat exchanger heat transfer and pressure drop with slit high of half fin pitch is greatest; the one-third high of fin pitch is lower. The slit fin heat transfer and pressure drop have 10% and 20% differences with the plain fin based on the plain fin. The effect on the heat transfer of slit high in the double row heat exchanger is about 7% and about 22% on the pressure drop based on the plain fin. The fin with mixed two slit high has the averaged performance between the two pure slit high fins.
This study can be used as a reference to the design and operation of the slit fin and tube heat exchanger.

目 錄
摘 要 I
ABSTRACT II
誌 謝 III
目 錄 IV
圖 目 錄 VI
表 目 錄 VIII
第一章 緒論 1
1- 1 前言 1
1-2 文獻回顧 1
1-3 研究目的 3
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 UA-LMTD-F與Ε-NTU分析法介紹 11
2-5 鰭片效率 與表面效率 推導 15
第三章 幾何模型與數值方法 19
3 -1 物理模型 19
3-2 使用軟體STAR-CD及STAR-CCM+介紹 21
3-3 邊界條件設定 22
3-4網格模型 23
3-5網格測試 25
3-6數值模擬與文獻結果比較 26
第四章 結果與討論 28
4-1單排平板與X型裂口鰭管式熱交換器之探討 28
4-2雙排平板與X型裂口鰭管式熱交換器之探討 38
第五章 結論 52
參考文獻 53

參考文獻
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