Advanced SearchSearch Tips
Condensing Heat Transfer Characteristics of R-22 and R-134a in Small Diameter Tubes
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Condensing Heat Transfer Characteristics of R-22 and R-134a in Small Diameter Tubes
Hong, Jin-U; No, Geon-Sang; Jeong, Jae-Cheon; O, Hu-Gyu;
  PDF(new window)
Condensing heat transfer coefficients of R-22 and R-134a were measured in smooth, horizontal copper tubes with inner diameters of 1.77mm, 3.36mm, and 5.35mm, respectively. The experiments were conducted in the closed loop, which was driven by a magnetic gear pump. Data are presented for the following range of variables : mass velocity from 200 to 500kg/.s and quality from 0 to 1.0. The heat transfer coefficients in the small diameter tubes (ID < 7mm) were observed to be strongly affected by various diameters and the heat transfer characteristics in the small diameter tubes differed from those in the large diameter tubes. Heat transfer coefficients in the small diameter tubes are higher than those in the large diameter tubes at the same experimental condition. It was found that some well-known previous correlations(Shahs correlation and Cavallini-Zecchins correlation) were not suitable for small diameter tubes.
Condensing Heat Transfer Coefficient;Small Diameter Tube;Heat Pump;R-22;R-134a;
 Cited by
홍진우, 오후규, 1999, '세관내 대체냉매의 응축 열전달 특성,' 공기조화.냉동공학회 학회지, Vol. 28, No. 5, pp. 396-402

Soliman, H.M, 1982, 'On the Annular-to -wavy Flow Pattern Transition During Condensation Inside Horizontal Tubes,' Canadian J. Chemical Engineering 60, pp. 475-481

Traviss, D.P., Rohsenow, W.M., 1973, 'Flow Regimes in Horizontal Two-Phase Flow with Condensation,' ASHRAE Tran. 79, pp. 31-39

Dobson, M.K., Chato, J.C., Hinde, D.K. and Wang, S.P., 1994, 'Experimental Evaluation of Internal Condensation of Refrigerations R-12 and R-134a,' ASHRAE Tran. No-94-5-3, pp. 744-754

Shah, M.M, 1979, 'A General Correlation for Heat Transfer During Film Condensation Inside Pipes,' Int. J. Heat and Mass Transfer, Vol. 22, pp. 547-556 crossref(new window)

Traviss, D.P., Rohsenow, W.M., Baron, A.B., 1973, 'Forced Convective Condensation in Tubes : A Heat Transfer Correlation for Condenser Design,' ASHRAE Tran. 79(1), pp. 157-165

Cavallini, A. and Zechin, R., 1974, 'A Dimensionless Correlation for Heat Transfer in Forced Convective Condensation,' Proceedings of the Fith International Heat Transfer Conference 3, pp. 309-313

Baird, J. R., Haynes, B. S., 1998, 'Development of a New Method to Study Condensation Heat Transfer in Fine Passages,' Proceedings of 11th IHTC. Vol. 6, pp. 341-346

Webb, R. L., Zhang, M. and Narayanamurthy, R. 1998, 'Condensation Heat Transfer in Small Diameter Tubes,' Proceedings of 11th IHTC. Vol. 6, pp. 403-408

Gallagher, J., McLinden, M., Morrison, G., and Huber, M., 1996, NIST Thermodynamic Properties and Refrigerant Mixtures Database (REFROP), Version 5.0, National Institute of Standards and Technology, Gaithersburg, MD, U.S.A.

Kline, S. J. and MeClintock, F. A., 1953, 'The Description of Uncertainties in single Sample Experiments,' Mech. Eng., Vol. 75, pp. 8-9

Yang, C.-Y. and Webb, R.L., 1996, 'Friction Pressure Drop of R-12 in Small Hydraulic Diameter Extruded Aluminum Tubes with and without Micro-Fins,' Int. J. Heat and Mass Transfer, Vol. 39, No. 4, pp. 801-809 crossref(new window)

Mishima, K. and Hibiki, T., 1996, 'Some Characteristics of Air-Water Two-Phase Flow in Small Diameter Vertical Tubes,' Int. J. Multiphase flow, Vol. 22, No. 4, pp. 703-712 crossref(new window)

Wilmarth, T. and Ishii, M., 1994, 'Two-Phase Flow Regimes in Narrow Rectangular Vertical and Horizontal Channels,' Int. J. Heat and Mass Transfer, Vol. 37, No. 12, pp. 1749-1758 crossref(new window)

Fujita, H., Ohara, T., Hirota, M. and Furuta, H., 1995, 'Gas-Liquid Floes in Flat Channels with Small Channel Clearance,' Proceedings of The 2nd International Conference on Multiphase Flow '95-Kyoto, IA3-37-44

오후규, 노건상, 김성규, 1993, '대체냉매 R-134a의 수평관내 증발 열전달에 관한 연구,' 냉동.공조공학회지, Vol. 12, No. 4, pp. 235-246

이동익, 1992, '대체냉매 R-134a를 이용한 수평이중관형 열교환기의 응축전열특성에 관한 연구,' 부산수산대 석사학위논문, pp. 18-52

Dittus, F.W. and Boelter, L.M., 1930, 'Heat Transfer in Automobile Radiators of Tubular Type,' University of California at Berkeley, Public Engineering, Vol. 2, p. 443

오종택, 飛原 英治, 2000, 'HFC 순수냉매 및 3성분 혼합냉매의 수평관내 응축열전달,' 대한기계학회논문집 B권, 제24권 제2호, pp. 233-240

Oh, H.-K., Katsuta, M. and Shibata, K. 1998, 'Heat Transfer Characteristics of R-134a in a Capillary Tube Heat Exchanger,' Proceedings of 11th IHTC. Vol. 6, pp. 131-136

김정오, 조진표, 김내현, 2000, '알루미늄 다체널 평판관내 R-22 응축에 관한 연구,' 대한기계학회논문집 B권, 제24권, 제2호, pp. 241-250

홍진우, 이호림, 김기수, 노건상, 오후규, 1999, '소구경관내 R-22와 R-134a이 응축 전열 특성에 관한 연구,' 대한기계학회 열공학부문, '99 추계학술대회 논문집, pp. 685-690

김종수, 勝田 正文, 1995, '멀티 패스 R-134a의 응축 열전달율 및 압력 손실,' 냉동.공조공학 제14권 제5호, pp. 273-283

전창덕, 정재원, 이진호, 1999, '자동차용 다채널관의 응축 열전달에 관한 연구,' 대한기계학회논문집 B권, 제23권, 제4호, pp. 479-491