A Comparative Study on the Condensation Heat Transfer of R-513A as an Alternative to R-134a

This paper presents the two-phase condensation heat transfer and pressure drop characteristics of R-513A as an alternative refrigerant to R-134a in a 9.52-mm OD horizontal microfin copper tube. The test facility had straight, section with active length 2.0 m was cooled by cold water circulated surrounding annular space. annular-side coefficients were obtained using Wilson plot method. average coefficient data are presented at temperature 35 °C range 100–440 kg·m−2·s−1 mass flux. compared those R-134a, R-1234yf, R-1234ze(E). R-1234ze(E) refrigerants similar lower flux (100~150 kg·m−2·s−1), while they up 10% higher than increased. R-1234yf that drops 20 %