Pbkp_rediction of two-phase condensation characteristics of some alternatives to R-22 inside air/refrigerant enhanced surface tubing

Abstract:

The results of an experimental study on the heat transfer characteristics of two-phase flow condensation of some azeotropic refrigerant mixtures, proposed as alternatives to R-22, on air/refrigerant horizontal enhanced surface tubing are presented. The condensation data indicated that the heat transfer coefficient of the blend R-408A has the highest heat transfer rate among the blends under investigation. The condensation data also showed that R-507 and R-404A have similar heat transfer rates to that of R-22 when plotted against the refrigerant mass flow rate. It can also be observed that, as the mass flux increases, the heat transfer coefficient increases. Correlations were proposed to pbkp_redict the heat transfer characteristics such as average heat transfer coefficients as well as pressure drops of alternatives to R-22 such as R-507, R-404A, R-407C and R-408A, as well as R-410A in two-phase flow condensation inside enhanced surface tubing. In addition, proposed correlations were found to fairly pbkp_redict the two-phase flow heat transfer condensation data. Copyright (C) 2000 John Wiley and Sons, Ltd.

Año de publicación:

2000

Keywords:

• Enhanced tubing
• Heat Transfer
• Condensation
• Alternative refrigerants

Fuente:

scopus