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研究生:黃啟宗
研究生(外文):C.T Huang
論文名稱:緻密熱交換器之熱傳性能提升之研究
論文名稱(外文):The study of heat transfer enhancement for compact fin tube heat exchangers
指導教授:溫茂育溫茂育引用關係
學位類別:碩士
校院名稱:正修科技大學
系所名稱:機電工程研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2005
畢業學年度:93
語文別:中文
論文頁數:55
中文關鍵詞:熱交換器空氣側之壓降摩擦係數熱傳係數j值
外文關鍵詞:Heat exchanger、Pressure drop of the air side、Friction factor、Transfer coefficient、Colburn factor
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摘要

本研究以三種不同的鰭片(平板型、波浪型及複合型)來進行實驗測試,其主要項目包含空氣側之壓降情形、熱傳係數之提升、摩擦係數 值與 值(Colburn factor)之計算及量測。實驗所採用之風扇其風速之範圍由1-3m/s,其雷諾數由600-2000。
實驗結果顯示由波浪形鰭片所構成之熱交換器相較於平板形鰭片空氣側之壓降提升11-32.1%,熱傳係數提升1-2.6%,f值提升11-32.7%,j值提升1.1-3%;而複合形鰭片空氣側之壓降提升34.1-62.9%,熱傳係數提升9.6-12.9%,f值提升34.4-71%,j值提升9.4-13.6%。由此可知複合型鰭片之熱交換器其壓降、熱傳係數、摩擦係數 值及 值之提升均較優於波浪型鰭片及平板型鰭片。
Abstract

This work presents an experimental information of the design on the elements of the heat exchanger. In the present study, three different fins (plat fin, wavy fin, and compounded fin) are performed in a wind tunnel. The pressure drop of the air side, the heat transfer coefficient, fanning friction factor (f), and the Colburn (j) against air velocity (1-3 m/s) and Reynolds number (600-2000) were discussed. In general, the results of the wavy fin compared to the flat fin show that, the pressure drop, heat transfer coefficient, f factor and j factor increase about 11-32.1 %, 1-2.6%, 11-32.7%, and 1.1-3%, respectively. In addition, the results of the compounded fin compared to the flat fin show that, the pressure drop, heat transfer coefficient, f factor and j factor increase about 34.1-62.9%, 9.6-12.9%, 34.4-71% and 9.4-13.6%, respectively. In summary, the present study strongly suggests to use the compounded fin constructed for heat exchanger.
目錄
目錄----------------------------------------------------------------------------------iii
表目錄--------------------------------------------------------------------------------v
圖目錄-------------------------------------------------------------------------------vi
符號說明---------------------------------------------------------------------------vii

第一章 緒論------------------------------------------------------------------------1
1-1 前言-----------------------------------------------------------------1
1-2 文獻回顧-----------------------------------------------------------3
1-3 研究重點-----------------------------------------------------------7

第二章 實驗設備及步驟---------------------------------------------------------8
2-1 實驗設備-----------------------------------------------------------8
2-2 實驗參數的控制與量測----------------------------------------11
2-3 實驗步驟----------------------------------------------------------12

第三章 結果與討論--------------------------------------------------------------15

第四章 結論與建議--------------------------------------------------------------18
參考文獻---------------------------------------------------------------------------42
附錄A 誤差分析-----------------------------------------------------------------45
參考文獻

1.Shah, R.-K, Classification of heat exchanger, In “Heat exchangers: thermal-hydraulic fundamentals and design”, Ed. by Kakac, S., Bergles, A.-E., and Mayinger, F., pp. 9-46, Hemisphere, New Yourk, 1981.
2.王啟川著, “熱交換器設計” 五南圖書出版有限公司90年2月
3.Jang, J.-Y., and Wu, M.-C., 1995, “Numerical and experimental studies of three dimensional plate fin and tube heat exchangers”, Int. J. Heat Mass Transfer, Vol. 39, No. 14, pp. 3057-3066.
4.Jang, J.-Y., and Chen, L.-K., 1997, “Numerical analysis of heat transfer and flow in a three dimensional wavy fin and tube heat exchangers”, Int. J. Heat Mass Transfer, Vol. 40, No. 16, pp. 3981-3990.
5.Madi, M.-A., Johns, R.-A.,and Heikal, M.-R., 1998, “Performance characteristics correlation for round tube and plate finned heat exchangers”, Int. J. Refrig, Vol.21, No. 7, pp. 507-517.
6.Yun, J.-Y., and Lee, K.-S., 1999, “Investigation of heat transfer characteristics on various kinds of fin and tube heat exchangers with interrupted surfaces”, Int. J. Heat Mass Transfer, Vol. 42, pp. 2375-2385.
7.Wang, C.-C., Tao, W.-H., and Chang, C.-J., 1999, “An investigation of the airside performance of the slit fin-and-tube heat exchangers”, Int. J. Refrig, Vol. 22, pp. 595-603.
8.Wang, C.-C., Jang, J.-Y., and Chiou, N.-F., 1999, “Technical Note. A heat transfer and friction correlation for wavy fin and tube heat exchangers”, Int. J. Heat Mass Transfer, Vol. 42, pp. 1919-1924.
9.Wang, C.-C., Lee, C.-J., Chang, C.-T., and Lin, S.-P., 1999, “Heat transfer and friction correlation for compact louvered fin and tube heat exchangers”, Int. J. Heat Mass Transfer, Vol. 42, pp. 1945-1956.
10.Wang, C.-C., Lin, Y.-T., and Lee, C.-J., 2000, “Heat and momentum transfer for compact louvered fin and tube heat exchangers in wet conditions,” Int. J. Heat Mass Transfer”, Vol. 43, pp. 3443-3452.
11.Wang, C.-C., Lee, W.-S., and Sheu, W.-J., 2001, “A comparative study of compact enhanced fin and tube heat exchangers”, Int. J. Heat Mass Transfer, Vol.44, pp. 3565-3573.
12.Wang, C.-C., Hwang, Y.-M., and Lin, Y.-T., 2002, “Empirical correlations of heat transfer and flow friction characteristics of herringbone wavy fin and tube heat exchangers”, Int. J. Refrig, Vol. 25, pp. 673-680.
13.Leu, J.-S., Lin, M.-S., Liaw, J.-S., and Wang, C.-C., 2001, “A numerical investigation of louvered fin and tube heat exchangers having circular and oval tube configurations”, Int. J. Heat Mass Transfer, Vol. 44, pp. 4235-4243.
14.Lozza, G., and Merlo, U., 2001, “An experimental investigation of heat transfer and friction losses of interrupted and wavy fins for fin and tube heat exchangers”, Int. J. Refrig, Vol. 24, pp. 409-416.
15.Wang, C.-C., Lo, J., Lin, Y.-T., and Wei, C.-S., 2002, “Flow visualization of annular and delta win let vortex generators in fin and tube heat exchanger application”, Vol. 45, pp. 3803-3815.
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