Condensation heat transfer and pressure drop of R32/R1123 inside horizontal multiport extruded tubes

The condensation heat transfer and frictional pressure drop characteristics of the zeotropic binary mix-ture R32/R1123 inside two horizontal multiport extruded tubes with different channel shapes were experimentally investigated. The experiments were conducted at a mass flux of 50-400 kgm(-2)s(-1) and an average saturation temperature of 40 degrees C. The effects of mass flux, quality, heat flux, and channel shape on the condensation heat transfer were quantified. The heat transfer coefficient and the frictional pressure drop of R32/R1123 were compared with those of pure R32 obtained using the same test multiport extruded tubes. The heat transfer coefficient of R32/R1123 was lower than that of R32 across all mass flux and quality conditions. The frictional pressure drop of R32/R1123 was 20-30% lower than that of R32 at the same mass flux and quality conditions. The correlations of previous studies agreed well with the obtained frictional pressure drop of R32/R1123, with a mean deviation of 17%. The obtained heat transfer coefficient of R32/R1123 was predictable with a mean deviation of -5.2% using the previous correlations proposed for multiport extruded tubes considering the heat transfer reduction due to the thermal resistance caused by temperature glide. (C) 2020 Elsevier Ltd and IIR. All rights reserved.