Modeling of condensation heat transfer of refrigerant mixture in micro-fin tubes

Condensation of pure and near-azeotropic refrigerants in microfin tubes: A new computational procedure

“…Equations by Kedzierski and Goncalves (1997), Han and Lee (2005), Chamra and Mago (2006) and Chamra et al (2005) exhibit on average a pretty good agreement with the experimental data points. On the other hand, in some cases, they appear to be more scattered than the new computational procedure.…”

“…(3-14)) and the equation proposed by Chamra and Mago (2006) and Chamra et al (2005) show a good agreement with the high pressure refrigerant data points. Also the new procedure presents the most accurate predictions for low and medium pressure refrigerants data points.…”

“…In recent years, many researchers such as Cavallini et al (1999), Chamra et al (2005), Chamra and Mago (2006), Han and Lee (2005), Kedzierski and Goncalves (1997), Koyama and Yonemoto (2006), Yu and Koyama (1998) and Wang et al (2007) have suggested different simple semi-empirical models for the calculation of the heat transfer coefficient during condensation in horizontal helical microfin tubes. Nomenclature…”

“…The authors argue that surface tension drainage and swirl effect have a little influence on the heat transfer enhancement that they attribute to the microfins that permit a combination of liquid-vapour interface mixing and turbulent mixing near the wall. Chamra and Mago (2006) and Chamra et al (2005) have suggested two different correlations for the prediction of the heat transfer coefficient during condensation, one is applicable to pure fluids, the other one is for refrigerant mixtures. Both are based on a theoretical analysis of turbulent film condensation inside a smooth tube, developed by assuming annular flow over the length of the tube.…”

Numerical Analysis of Turbulent Flow and Heat Transfer in Internally Finned Tubes

“…Ji et al (2015) found that their thermal-hydraulic performance is the best among all enhanced tubes through a comprehensive literature review. Much work has been done to investigate the heat transfer characteristics of internally finned tubes in condensation (Seo and Kim, 2000;Kim et al, 2002;Yu et al, 2002;Yun et al, 2002) and evaporation (Chamra and Webb, 1996;Chamra et al, 2004Chamra et al, , 2005Chamra and Mago, 2006), but the heat transfer characteristics of single-phase in these tubes are not thoroughly understood for lack of research. The internally finned tube has high requirements for water quality, and the working fluid is required to be clean enough with almost no impurities, otherwise they may affect the heat transfer performance.…”