Browse > Article
http://dx.doi.org/10.5916/jkosme.2007.31.3.224

Study on the evaporation Heat Transfer Characteristics of R-134a in Small Diameter Tubes  

Roh, Geon-Sang (Tongmyong University, Dept. of Environmental Equipment)
Oh, Hoo-Kyu (Pukyong National University)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.31, no.3, 2007 , pp. 224-234 More about this Journal
Abstract
Large diameter tubes have been used until comparatively lately. However, small diameter tubes are largely used because of their high efficiency in heat transfer and low cost, recently. This study focuses on the experimental research of the heat transfer coefficients during evaporation process of R-22 and R-134a in small diameter tubes. The evaporation heat transfer coefficients were measured in smooth horizontal copper tubes with ID 1.77, 3.36 and 5.35 mm. The evaporation heat transfer coefficients in the small diameter tubes (ID <7 mm) were observed to be strongly affected by the size of tube diameters and to differ from those of general predictions in the large diameter tubes. The heat transfer coefficients of ID 1.77 mm copper tube were higher by 20 and 30 % than those of ID 3.36 mm, ID 5.35 mm copper tubes respectively. Also, it was found that it was very difficult to apply some well-known previous predictions (Shah's, Jung's. Kandlikar's and Oh-Katsuda's correlation) to small diameter tubes. Based on the data, the new correlation is proposed to predict the evaporation heat transfer coefficients of R-22 and R-134a in small diameter tubes.
Keywords
Refrigerant; Evaporation heat transfer coefficient; Small diameter tube;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Wambsganss, M.W., Jendrzejczyk, J.A. and France, D. M., 1991, 'Two-phase flow patterns and transitions in a small, horizontal, rectangular channel', Int. J. Multiphase Flow, vol. 17, no. 3, p. 327-342   DOI   ScienceOn
2 Oh, Hoo-Kyu, Katsuta, M. and Shibata, K., 1998, 'Heat transfer characteristics of R-134a in a capillary tube heat exchanger', Proceedings of 11th IHTC. vol. 6, p. 131-136
3 Oh, Hoo-Kyu and Hong, Jin-Woo, 2002, 'Study on the Flow Characteristics of R-22, R-134a in Small Diameter Tubes', Trans of SAREK, vol. 14, no. 9, p. 756-765   과학기술학회마을
4 Kandlikar, S.G., 'A general correlation for saturated two-phase flow boiling horizontal and vertical tubes', Trans. ASME, vol. 112, p. 219-228   DOI
5 Peng, X. F. and Wang, B. X. 1993, 'Forced convection and flow boiling heat transfer for liquid flow through micro-channels', Int. J. Heat and Mass Transfer, vol. 36, no. 14, p. 3421-3427   DOI   ScienceOn
6 McLinden, M. O., Klein, S. A., Lemmon, E. W., Peskin, A. P., 1998, NIST Thermodynamic Properties and Refrigerant Mixtures Database (REFPROP), Version 6.01, National Institute of Standards and Technology, Gaithersburg, MD, U.S.A
7 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, p. 1749-1758   DOI   ScienceOn
8 Oh, Hoo-Kyu, Park, Ki-Won, Roh, Geon-Sang and Hong, Jin-Woo, 2004, 'Study on the Condensation Heat Transfer Characteristics in Small Diameter Tubes', J. of the Korea Society of Marine Engineers, vol. 28, no. 1, p.29-38
9 Shah, M. M., 1982, 'Chart correlation for saturated boiling heat transfer equations and further study', ASHRAE Tran., vol.88, p. 185-196
10 Ralph L. Webb, Ming Zhang and R. Narayanamurthy, 1998,'Condensation Heat Transfer in Small Diameter Tubes', Proc. of 11th IHTC. vol. 6. p. 403-408
11 Jung, Dong-Soo, McLinden, M., Randermacher, R. and Didion, D., 1989, 'A study of flow boiling heat transfer with refrigerant mixtures', Int. J. Heat and Mass Transfer, vol. 32, no. 9, p. 1751-1764   DOI   ScienceOn
12 Wambsganss, M. W., France, D. M. and Jendrzejczyk, J. A., 1993, 'Boiling heat transfer in a horizontal small-diameter Tube', Trans. ASME, vol. 115, p. 963-972   DOI   ScienceOn