Nucleate boiling heat transfer of R134a on enhanced tubes

Local heat transfer coefficient for pool boiling of R-134a and R-123 on smooth and enhanced tubes

“…respectively. R-134a on TBIIHP data were compared with Robinson and Thome (2004), Ribatski and Thome (2006), Chen and Tuzla (1996), and Tatara and Payvar (2000). Data showed a good agreement with both Robinson and Thome (2004), and Ribatski and Thome (2006).…”

“…The second study presented nucleate pool boiling of R-11, R-123, and R-134a on structured enhanced tubes having pores with connecting gaps. Pool boiling studies that utilized water-heated test sections are Robinson and Thome (2004) and Ribatski and Thome (2006). The two studies reported average heat transfer coefficients but no local measurements were reported.…”

Experimental Determination of the Boiling Heat Transfer Coefficients of R-134a and R-417A on a Smooth Copper Tube

“…At these conditions, as mentioned before, the experimental HTCs obtained for R-417A are higher than those achieved in the same heat flux range but with a saturation temperature of 10 ºC, which is a behaviour different to the expected for pool boiling and pure refrigerants. Therefore, the predicted HTCs obtained by means of correlations, despite the fact that these correlations have been adapted using equation (9), underestimate the experimental HTCs. From these comparisons it is concluded that the discrepancies are inside the actual differences between models.…”

“…Reference [8] includes the study of 5 refrigerants on smooth tubes made of different materials and several roughnesses. Reference [9] studies nucleate boiling with R-134a and 4 enhanced surfaces as well. Several authors have stated nucleate boiling heat transfer experimental correlations on smooth tube and for pure refrigerants.…”

Enhancement of the boiling process of refrigerants with high temperature glide and low gwp

“…A detailed review of publications discussing the boiling process on extended surfaces has been included in [2]. Ribatski and Thome [2] presented the results of their analyses of the boiling process of R134a outside several types of industrial finned tubes, i.e.…”