臺灣博碩士論文加值系統

本研究旨在探討冷凍系統內連結具內微鰭螺旋管分配器之流動分配最佳化之設計研究，試以水平放置之微鰭管連結文氏管之分佈器，前端連接平滑管、及具有(扭帶型、螺旋線圈型、繞花絲型)內插物，與不具有內插物之微鰭管，探討冷媒(R-134a)流經不同測試管，連接文氏管式分佈器之後，於11支歧管內冷媒分配效率與不均勻度之影響，探討其冷媒分佈器分配冷媒流量之不均勻度，作一性能提昇探討與比較。實驗在飽和溫度為25℃、質量速度為 200 ~ 700 kg/m2s及5種不同測試管下進行。
實驗結果顯示，微鰭管連結文氏管之分佈器，前端連接具繞花絲型內插物之微鯺管，具有最佳之分配效率，其次為扭帶、螺旋線圈、微鰭空管、平滑空管。

The present research designed and presented the experimental information on two-phase flow distribution of refrigerant R-134a in 11 round-horizontal manifolds of compact heat exchanger using the Venturi-type tube connected with the smooth tube, internally-spirally micro-finned tube within three different inserts (twined coil, twisted tape and wire coil) and without insert. The tests were run at the saturation temperature of 25℃, mass flux of 200-700 kg/m2s and 5 different test tubes. It was found that the Venturi tube connected with the internally-spirally micro-finned tube within the twined coil insert got the best two-phase flow distribution, followed by the twisted tape insert, the wire coil insert, without insert, and smooth tube, respectively.

中文摘要------------------------------------------------------------------------------i
英文摘要-----------------------------------------------------------------------------ii
目錄----------------------------------------------------------------------------------iii
表目錄-------------------------------------------------------------------------------vi
圖目錄-------------------------------------------------------------------------------vii
符號說明----------------------------------------------------------------------------ix
第一章 緒論 ----------------------------------------------------------------------01
1-1研究背景-----------------------------------------------------------------01
1-2文獻回顧-----------------------------------------------------------------04
1-3研究目的-----------------------------------------------------------------13
1-4研究範圍-----------------------------------------------------------------14
第二章 實驗方法 ----------------------------------------------------------------15
2-1實驗系統-----------------------------------------------------------------15
2-1.1冷媒循環系統---------------------------------------------------15
2-1.2測試段------------------------------------------------------------16
2-1.3分佈器量測點配置---------------------------------------------17
2-1.4實驗系統設備---------------------------------------------------17
2-2實驗量測設備-----------------------------------------------------------18
2-2.1溫度量測---------------------------------------------------------18
2-2.2壓力量測---------------------------------------------------------19
2-2.3流量量測---------------------------------------------------------19
2-2.4資料收集系統---------------------------------------------------20
2-3實驗過程-----------------------------------------------------------------20
2-3.1系統測漏---------------------------------------------------------20
2-3.2系統冷媒填充---------------------------------------------------21
2-4實驗範圍-----------------------------------------------------------------21
2-5研究步驟-----------------------------------------------------------------22
2-6資料換算-----------------------------------------------------------------22
2-6.1溫度與壓力分佈平均偏差值---------------------------------23
2-6.2冷媒質量速度---------------------------------------------------23
2-6.3文氏管式分佈器出口各支路之流率------------------------24
2-6.4分佈器不均勻度------------------------------------------------24
2-6.5不確定分析------------------------------------------------------25
第三章 結果與討論 ------------------------------------------------------------ 34
3-1文氏管連結不同測試管溫度分佈平均偏差值之比較-----------35
3-2文氏管連結不同測試管壓力分佈平均偏差值之比較-----------37
3-3文氏管連結不同測試管管間壓力之比較--------------------------40
3-4文氏管連結不同測試管不均勻度之比較--------------------------43
3-5文氏管連結不同測試管綜合評估-----------------------------------44
第四章 結論與建議 -------------------------------------------------------------57
4-1結論-----------------------------------------------------------------------57
4-2建議與未來研究方向--------------------------------------------------58
參考文獻 --------------------------------------------------------------------------60
附錄A誤差分析 ---------------------------------------------------------------- 64

1. 楊斐喬,羅慧瑋, 我國HCFC冷媒管制動態與使用現況, 環保月刊,
Vol. 2, No. 11, pp. 140-149, 2002.
2. 曹永偉, 非氟氯碳系統冷媒之物性、冷凍性能及應用之探討, 電機月刊, Vol. 15, No. 5, pp. 120-127, 2005.
3. 王文博,胡興邦編著, 冷凍空調原理下冊,承美科技圖書有限公司.
4. 王啟川著, 熱交換器設計(I), 五南圖書出版有限公司.
5. Muller, A.C., Chiou, J.P., “Review of various types of flow
maldistribution in heat exchangers,” Heat Transfer Engineering, Vol. 9 , pp. 36-50, 1988.
6. Kitto Jr., J.B., Robertson, J.M., “Effects of maldistribution of flow on heat transfer equipment performance,” Heat Transfer Engineering, Vol. 10, pp. 18-25, 1989.
7. Nakayama, M., Sumida, Y., Hirakuni, S., Mochizuki, A., “Development of a refrigerant two-phase flow distributor for a room air conditioner,” International Refrigeration Conference at Purdue, pp. 313-319, 2000.
8. Gao, J., Tian, H., Yuan, X., “分佈器在制冷系統中的應用”, Refrigeration and Air-Conditioning, Vol. 1, No. 5, 2001.
9. Gao, J., Tian, H., Zeng, Y., Yuan, X., “Research for performance of liquid-distributor,” Refrigeration and Air-Conditioning, Vol. 2, No. 4, 2002.
10. Simões-Moreira, J.R., Bullard, C.W., “Pressure drop and flashing mechanisms in refrigerant expansion devices,” International Journal of Refrigeration 26, pp.840-848, 2003.
11. Lee, J.K., Lee, S.Y., “Distribution of two-phase flow at header-channel junctions,” Experimental Thermal and Fluid Science, Vol. 28, pp. 217-222, 2004.
12. Liang, J., Tian, H., Gao, Y., Cheng, L., Cheng, J., “Experimental investigation on performance of a new type of distributor,” Refrigeration and Air-Conditioning, Vol. 4, No. 2, pp. 25-27, 2004.
13. Liao, Q., Xu, S., Zhu, X., Tian, X., “Experimental investigation on performance of liquid distributor for trickling biofilter,” Journal of Thermal Science and Technologf, Vol. 3, No. 3 , pp. 205-209, 2004.
14. Li, G., Frankel, S., Braun, J. E., Groll, E. A., “Application of CFD models to two-phase flow in refrigerant distributors,” HVAC&R RESEARCH, Vol. 11, No. 1, pp. 45-62, 2005.
15. Gao, L.W., “Function and application of distributor”, Low Temperature
and Sperialty Gases, Vol. 25, No. 4, pp.9-12, 2007.
16. Wu, Z., Ma, H., Cai, Z., “Convective heat transfer of R32/R134a inside horizontal microfin tubes,” Jourmal of Chemical Industry and Engineering, Vol. 56, No. 2, pp. 239-243, 2005.
17. Wu, J.X., Wang, H.F., Wang, B.D., “Analyses on the performance of enhanced heat transfer structure inside tube,” Energy Conservation Technology, Vol. 24, No. 2, pp. 150-154, 2006.
18. Zhang, X., Yuan, X., Tian, H., “Evaporation heat transfer of R417a flowing inside horizontal smooth and internally grooved tubes,” Journal of Xi’an Jiaotong university, Vol. 41, No. 1, pp. 18-23, 2007.
19. Said, S.A., Azer, N.Z., “Heat transfer and pressure drop during condensation inside horizontal tubes with twisted-tape inserts,” ASHRAE Transactions, Vol. 89, pp. 96-113 , 1983.
20. Al-Fahed, S., Chamra, L.M., Chakroun, W., ”Pressure drop and heat transfer comparison for both microfin tube and twisted-tape inserts in laminar flow,” Experimental Thermal and Fluid Science, Vol. 18, pp. 323-333, 1999.
21. Smit, F.J., Meyer, J.P., “R-22 and zeotropic R-22/R-142b mixture condensation in microfin, High-Fin, and twisted tape insert tubes,” ASME J, Vol. 124, pp. 912-921, 2002.
22. Zang, H., Zhou, Q.T., “Experimental investigation on heat transfer and flow resistance characteristics of smooth round tubes with twisted-tape inserts,” Physics Examination and Testing, Vol. 23, No. 5, pp. 15-19,.2005.
23. Zhang, L., Qian, H.W., Yu, X.M., Xuan, Y.M., Peng, D.Q., “Investigation of turbulent characteristics in the self-rotating, self-cleaning twisted-tape-inserted tube,” Joumal of Chemical Engineering of Chinese Universities, Vol. 19, No. 1, pp. 17-22, 2005.
24. Naphon, P., “Heat transfer and pressure drop in the horizontal double pipes with and without twisted tape insert,” Int. Comm. Heat Mass Transfer, Vol. 33, pp. 166-175 , 2006.
25. Lan, J., Disimile, P.J., Weisman, J., “Two phase flow patterns and boiling heat transfer in tubes containing helical wire inserts. part1: flow patterns and boiling heat transfer coefficient,” Enhanced Heat Transfer, Vol. 4, pp. 269-281, 1997.
26. Agrawal, K.N., Kumar, Anil., Akhavan-Behabadi, M.A., Varma, H.K., ”Heat transfer augmentation by coiled wire inserts during forced convection condensation of R-22 inside horizontal tubes,” Int. J. Multiphase Flow, Vol. 24, pp. 635-650, 1998.
27. Akhavan-Benabadi, M.A., Varma, H.K., Agarwal, K.N., ”Enhancement of heat transfer rates by coiled wires during forced convective condensation of R-22 inside horizontal tubes,” Enhanced Heat Transfer, Vol. 7, No 23, pp. 69-80, 2000.
28. Liu, X.H., Li, S.P., Shen, Z.Q., Qi, S.J., “Research on forced convection heat transfer in a horizontal tube with spiral spring inserts,” Journal of Petrochemical Universities, Vol. 14, No. 3, pp. 57-60, 2001.
29. Rashid-Sarkar, M.A., Zaidll Islam, M., Islam, M.A., “Heat transfer in turbulent flow through tube with wire-coil inserts,” J. Enhanced Heat Transfer, Vol. 12, pp. 385-394, 2005.
30. Naphon, P., Sriromruln, P., “Single-phase heat transfer and pressure drop in the micro-fin tubes with coiled wire insert,” Int. Comm. Heat Mass Transfer, Vol. 33, pp. 176-183, 2006.
31. Sui, H.M., Huang, W.T., “The experimental study of intensified condensation heat exchange with double helix spring inserted,” Applied Science and Technology, Vol. 34, No. 8, pp. 55-59, 2007.
32. Du, J., Hu, Q., “Analysis and contrast on performance of new type heat exchanger,” Pressure Vessel Technology, Vol. 12, No. 1, pp. 52-55, 1995.
33. Jiang, S.I., “Study about the technique of filiform lap-ups znterpolating elements strengthen heat transfer across a tube,” Natural Science Edition, No. 1, 1997.
34. 齊承英, 姚[秦, 李一兵等, “多孔體內插物強化蒸汽凝結換熱計算關聯式,” Journal of Engineering Thermophysics, Vol. 22, pp. 81-84, 2000.
35. Yang, J.L., Ma, Y.T., “Analys is of heat transfer enhancement performance and its application in tube inserts,” Power Engineering, Vol. 24, No. 3, 2004.
36. Yang, J.L., Ma, Y.T., Yu, Y.Q., “Experimental study of condensation heat transfer enhancement by twined coil inserts,” Journal of Tianjin University, Vol. 37, No 11, pp. 990-996, 2005.
37. 陳金賢, “冷媒R134a與潤滑油在小管內之熱傳及壓降實驗分析,” 中央大學機械系碩士論文, 2000.
38. 釵u中譯著, 冷凍基本技術, 全華科技圖書股份有限公司.
39. 杜鳳棋譯著, 流體力學下冊, 高立圖書有限公司.