Condensation of refrigerants in horizontal microfin tubes: comparison of correlations for frictional pressure drop |
| |
Authors: | H S Wang J W Rose H Honda |
| |
Affiliation: | a Department of Engineering, Queen Mary, University of London, London E1 4NS, UK;b Institute of Advanced Material Study, Kyushu University, Kasuga, Fukuoka 816-8580, Japan |
| |
Abstract: | This paper presents a comprehensive comparison of eight previously proposed correlations with available experimental data for the frictional pressure drop during condensation of refrigerants in helically grooved, horizontal microfin tubes. Calculated values are compared with experimental data for seven refrigerants (R11, R123, R134a, R22, R32, R125 and R410A) and eight tubes and with mass velocity from 78 to 459 kg/m2 s. The tubes had inside diameter at the fin root between 6.41 and 8.91 mm; the fin height varied between 0.15 and 0.24 mm; the fin pitch varied between 0.34 and 0.53 mm and helix angle between 13 and 20°. The results show that the overall r.m.s. deviations of relative residuals of frictional pressure gradient for all tubes and all refrigerants taking together decreased in the order of the correlations of Nozu et al. Exp. Therm. Fluid Sci. 18 (1998) 82], Newell and Shah Refrigerant heat transfer, pressure drop, and void fraction effects in microfin tubes. In: Proc. 2nd Int. Symp. on Two-Phase Flow and Experimentation, vol. 3. Italy: Edizioni ETS; 1999. p. 1623–39], Kedzierski and Goncalves J. Enhanced Heat Transfer 6 (1999) 161], Cavallini et al. Heat Technol. 15 (1997) 3], Goto et al. (b) Int. J. Refrigeration 24 (2001) 628], Choi et al. Generalized pressure drop correlation for evaporation and condensation in smooth and microfin tubes. In: Proc. of IIF-IIR Commision B1, Paderborn, Germany, B4, 2001. p. 9–16], Haraguchi et al. Condensation heat transfer of refrigerants HCFC134a, HCFC123 and HCFC22 in a horizontal smooth tube and a horizontal microfin tube. In: Proc. 30th National Symp. of Japan, Yokohama, 1993. p. 343–5], and Goto et al. (a) Int. J. Refrigeration 24 (2001) 628], i.e., this final correlation (Goto et al. (a)) gives the best overall representation of the data. |
| |
Keywords: | Refrigerant R410A R11 R123 R134A R22 R32 R125 Condensation Tube Inside Enhanced tube Pressure lossAuthor Keywords: Frigorigè ne R410A R11 R123 R134A R22 R32 R125 Condensation Tube Inté rieur Surface augmenté e Chute de pression |
本文献已被 ScienceDirect 等数据库收录! |
|