Condensation heat transfer coefficients of enhanced tubes with alternative refrigerants for CFC11 and CFC12

Condensation of R-134a on horizontal integral-fin titanium tubes

“…Jung et al [2] reported that the condensation HTCs calculated by the Nusselt model for condensation of R-134a at 39 ºC saturation temperature on a plain tube with 19.05 mm outer diameter were between 12 and 14.9% lower than the measured ones. Belghazi et al [5] reported a mean deviation of +5% between their experimental data and the Nusselt predictions for condensation of R-134a at 40 ºC saturation temperature on a tube with 16.8 mm outer diameter.…”

“…Generally, these tubes are made of copper or copper-nickel alloys. The condensation heat transfer of HFC-134a on plain and different types of enhanced tubes is reported in several papers, Jung et al [2], Honda et al [3,4], Belghazi et al [5], Kumar et al [6][7][8], Gstoehl and Thome [9], Zhang et al [10] or Kang et al [1].…”

Condensation heat transfer coefficients of flammable refrigerants

“…This work is designed mainly to provide reliable data to the refrigeration industry for the design and manufacture of high efficiency condensers with those fluids. In fact, this is a sequel paper to our previous reports on the external condensation HTCs of CFC11 and CFC12 and their alternative refrigerants on horizontal tubes [9] and HCFC22 and R407C and R410A [10].…”

Condensation Heat Transfer on Geometrically Enhanced Horizontal Tube: A Review

“…Jung et al [38] reported vapour-side, heat-transfer enhancements for an integral-fin tube with fin density of 26 fins per inch and a three-dimensional turbo-C tube with a fin density of 42 fins per inch condensing two low-pressure (R-11 and R-123) and two medium-pressure (R-12 and R-134a) refrigerants. A plain tube was also tested for comparison.…”