Condensation heat transfer in a bundle of horizontal enhanced surface copper tubes (Gewa C+ tubes) has been experimentally investigated, and a comparison with trapezoidal shaped fin tubes with several fin spacing has been made. These tubes have a specific surface three-dimensional geometry (notched fins) and the fluids used are either pure refrigerant (HFC134a) or binary mixtures of refrigerants (HFC23/HFC134a). For the pure fluid and a Gewa C+ single tube, the results were analyzed with a specifically developed model, taking into account both gravity and surface tension effects. For the bundle and for a pure fluid, the inundation of the lowest tubes has a strong effect on the Gewa C+ tube performances contrary to the finned tubes. For the mixture, the heat transfer coefficient decreases dramatically for the Gewa C+ tube.
Condensation Heat Transfer on Enhanced Surface Tubes: Experimental Results and Predictive Theory
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division January 25, 2001; revision received October 30, 2001. Associate Editor: M. K. Jensen.
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Belghazi, M., Bontemps, A., and Marvillet, C. (July 16, 2002). "Condensation Heat Transfer on Enhanced Surface Tubes: Experimental Results and Predictive Theory ." ASME. J. Heat Transfer. August 2002; 124(4): 754–761. https://doi.org/10.1115/1.1459728
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