臺灣博碩士論文加值系統

本論文主要目地分為兩部份，第一部份是使用吸入型開放式風洞測試系統，針對多面式蒸發器之鰭管式熱交換器，在不同的鰭片形狀﹙百葉窗型、波浪型﹚、不同的鰭片間距﹙18 片/inch、20片/inch、22片/inch﹚及相同的管外徑下，以瞭解其熱傳特性、壓降特性及不同的鰭片形狀及不同的鰭片間距對熱交換器性能之影響。另一部份是利用此蒸發器開發一台冷凍能力為4000 kcal/hr及EER為2.5 kcal/hr.w之一對一分離式冷氣機。
第一部份：本文在多面式蒸發器之熱液動性能測試方面，測試時是管測走熱水或冰水，鰭側走空氣，而熱水進口維持在70℃，冰水進口維持在10℃，水流量維持在6L/min上下，改變熱交器之正向風速﹙0.8 m/s~4.5 m/s﹚以探討熱傳量、壓降、熱傳因子js值、質傳因子jm與壓降因子f值的變化。由實驗結果將波浪型鰭片與百葉窗型鰭片做比較，發現百葉型鰭片的熱傳量及壓降、總熱傳係數、熱傳因子js值、質傳因子jm與壓降因子f值都高於波浪型鰭片。
第二部份：在分離式冷氣機組之性能測試方面，測試時是管測走冷媒﹙R22﹚，鰭側空氣，利用百葉窗型鰭片節距為18片/inch與20片/inch之蒸發器改變毛細管之管徑及管長、冷媒量等等，使得在改變上述條件下開發一台冷凍能力達4000 kcal/hr及EER為2.5 kcal/hr.w左右之一對一分離式冷氣機。測試結果鰭片節距為18﹙片/inch﹚、毛細管直徑為1.7mm，長度為600mm及冷媒充填量為1100g時，能夠達冷涷能力為4000 kcal/hr及EER為2.5 kcal/hr.w左右之一對一分離式冷氣。

There are two parts in this paper. For the first part, an induced wind tunnel was used to measure the thermal-hydraulic characteristics of multi-bent evaporator for different fin shapes (louver, wavy fins), different fin pitches( 18,20 and 22 fins per inch) . The second part of this paper was to develop an air conditioning unit with cooling capacity of 4000kcal/hr and Energy Efficiency Ratio (EER) of 2.5 kcal/hr.w.
﹙1﹚ The first part of this paper: Measurements were made for the air frontal velocity ranging from 0.8 m/s ~ 4.5 m/s , while the water inlet temperature and flow rate were maintained at 70℃ , 6 L/min for the dry coils and at 10℃ , 6 L/min for the wet coils , respectively. The experimental results indicated that , louver fins have higher Colburn and friction factors compared to the wavy fins.
﹙2﹚ The second part of this paper: The performances of an air-conditioning unit were measured in an environmental-controlled chamber. The refrigerant in the tube side is R22. It is found that to get a cooling capacity of 4000kcal/hr and EER of 2.5 kcal/hr.w, one must uses louver fin with fin pitch 18fins/inch, the capillary tube with diameterψ1.7mm and length 600mm, and the R22 filling mass of 1100g.

摘要…………………………………………………………………….Ⅰ
英文摘要………………………………………………….……………Ⅱ
誌謝……………………………………….……………………………Ⅲ
目錄……………………………………………………………………Ⅳ
表目錄…………………………………………………………………Ⅴ
圖目錄…………………………………………………………………Ⅵ
符號說明………………………………………………………………ⅩⅠ
第一章 緒論……………………………………………………………1
第二章 多面式蒸發器之熱液動性能測試……………………………14
第三章 分離式冷氣機組之性能測試…………………………………69
第四章 結論……………………………………………………………104
參考文獻………………………………………………………………105
附錄一…………………………………………………………………108
附錄二…………………………………………………………………110

1. 日本 Tohiba公司技術報告"Development of Heat Exchanger for Air conditioner" by Nakamnra, Kodio, Hougo and Nagamori.
2. Kays, W. M. and London, A. L. , "Compact Heat Exchangers", 3th.ed McGraw-Hill,1984.
3. Briggs, D. E. and Young , E. H., "Convection Heat Transfer and Pressure Drop of Air Flowing across Triangular Pitch Banks of Finned Tubes", Chem. Eng. Prog. Symp. Ser., Vol.59, No.41, pp.1-10, 1963.
4. Robinson, K. K. and Briggs, D. E., "Pressure Drop of Air Flowing across Triangular Pitch Banks of Finned Tubes", Chem. Eng. Prog. Symp. Ser., Vol.62,No.64,PP.177-184,1996.
5. Rich, D. G. "The Effect of Spacing on the Heat Transfer and Friction Performance of Multi-Row, Smooth Plate Fin and Tube Heat Exchanger", ASHRAE , Trans., Vol. 79, pp.137-145,1973.
6. Rich, D. G., "The Effect of the Number of Tube Row on the Heat Transfer Performance of Smooth Plate and Fin-Tube Heat Exchangers", ASHRAE Trans., Vol.81, Pt.1, pp.307-317, 1975.
7. McQuiston, F. C., and Tree, D. R., "Heat Transfer and Flow Friction Data for Two Fin-Tube Surface", J. Heat Transfer, Vol. 93, pp.247-250, 1971.
8. Guillory, J. L. and McQuiston, F. C., "An Experimental Investigation of Air Dehumidication In a Parallel Plate Exchanger", ASHRAE, pp.24-28,1973.
9. McQuiston, F. C., "Heat, Mass and Momentum Transfer In a Parallel Plate Dehumidifying Exchanger", ASHRAE Trans., Vol. 82, Part Ⅱ, pp.87-106 , 1976.
10. McQuiston, F. C., "Correlation of Heat, Mass and Momentum Transport Coefficients for Plate-Fin-Tube Heat Transfer Surfaces with Staggered Tubes" Staggered Tubes", ASHRAE Trans., Vol.84, pp.290-308, 1978.
11. Gray, D. L. and Webb, R. L., "Heat Transfer and Friction Correlations for Plate Finned-Tube Heat Exchangers Having Plain Fins", Proc.8th Int. Heat Transfer Conf., pp.2745-2750, 1986.
12. Kayansayan, N., "Heat Transfer Characterization of Flat Plain Fins and Round Tube Heat Exchangers", Exp. Thermal and Fluid Science, Vol. 6, pp.263-272, 1993.
13. Okada, K. Ono, M., Tomimura, T. Okuma, T., Konno, H. and Ohtani, S., "Design and Heat Transfer Characteristics of New Plate Heat Exchangers", Heat Transfer-Japanese Research, Vol.1, No., pp.90-95, 1972.
14. Yoshi, T., "Transient Testing Technique for Heat Exchangers Fin Surfaces", Heat Transfer Japan. Res., Vol.1, No.3, pp.51-58, 1972.
15. Ypshii, T., Yamamoto, M. and Otaki, T., "Effects of Dropwise Condensate on Wet Surface Heat Transfer for Air cooling Coils", Proc.13th Int. Cong. Of Refrigeration, pp.285-292, 1973.
16. Giovannoni F., and Mattarlo, L., "Experimental Researches on the Finned Tube Heat Exchangers With Corrugated Fins", Proceeding Tome Ⅱ of the XVIth Int. Congress of Refrigeration, Paris, paper B. 1-493, pp.215-220, 1983.
17. Beecher, D. T, and Fagan, T. J., "Effects of Fin Pattern on the Air-Side Heat Transfer Coefficient in Plate Finned-Tube Heat Exchangers", ASHRAE Transfer Coefficient in Plate Finned-Tube Heat Exchangers", ASHRAE Transaction, Vol.96, No.2, pp.445-449, 1990.
18. Wang, C. C., Fu, W. L., and Chang, C. T., "Heat Transfer and Friction Characteristics of Typical Wavy Fin-and-Tube Heat Exchanger", Experimental Thermal and Fluid Science, Vol.14, No. 2, pp.174-186, 1997.
19. Chang, C. T., Lee, W.S. and Wang, C. C., "On Herringbone Fin-and Tube Heat Exchangers", Int. J. of Heat and Mass Transfer, Vol.119, pp.560-567, 1997.
20. Wang, C. C., Jang, J. Y. and Chiou N. F., "A Heat Transfer and Friction Correlation for Wavy Fin-and-Tube Heat Exchangers", International Journal of Heat and Mass Transfer 42, pp.1919-1924, 1999.
21. Chang. Y. J., Wang. C. C., Tsi. W. C. and Shyu. R. J., "Air Side Performance of Louver Fin Heat Exchanger", in proceeding of the 4th ASME/JSME Thermal Engineering Joint Conference 4,pp. 367-372,1995.
22. Wang. C. C. and Chi. K. Y., "An experimental study of heat transfer and friction characteristics of typical louver fin-and-tube heat exchangers", Int. J. of Heat and Mass Transfer, Vol. 41, No. 4-5, pp817-822, 1998.
23. CNS 3615 「室內空氣調節機」經濟部中央標準局，1992。
24. ASHRAE Standard 41.2-1987, "Standard Method for Laboratory Air-Flow Measurement", American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., Atlanta, 1987.
25. Gnilimski. V, "New Equation for Heat and Mass Transfer in Turbulent Pipe and Channel Flow", Int. Chem. Eng., Vol.16, pp.359-368, 1976.
26. Schmidt. T. E., "La Production Calorifique des Surface Munies D'ailettes", Annexe Du Bulletin De L'Institut International Du Froid, Annexe G-5, 1945-46.
27. McQuiston. F. C., and Parker. J. D., "Heating Ventilating, and Air Conditioning Analysis and Design", pp.609-613, 4th, John Wiley & Sons, New York, 1984.
28. Shah. K., "Heat Exchangers Basic Design Method, in Low Reynolds Number Flow Heat Exchangers", Edited by S. Kakas, R. K. Shah, and A. E. Bergles, pp.21-72, Hemisphere/McGraw-Hill, Washington, D. C., 1983.
29. Ecker. E. R. G. and Drake, R. M., Jr., "Heat and Mass Transfer", McGraw-Hill Inc., New York, 1959.
30. Wang. C. C., Lee. C. J., Chang C. T. and Lin. S .P., "Heat Transfer and Friction Correlation for Compact Louvered Fin-and-Tube Heat Exchangers", Int. J. of Heat and Mass Transfer, Vol. 42, pp 1945-1956. 1999.
31. Moffat, R. J., "Describing the Uncertainties in Experimental Results", Experimental Thermal and Fluid Science, Vol. 1, pp.3-17, 1988