Condensation heat transfer on enhanced surface tubes: experimental results and predictive theory

Mourad Belghazi , André Bontemps (1) , Christophe Marvillet

1 LEGI - Laboratoire des Écoulements Géophysiques et Industriels [Grenoble]

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.

Mots clés: Heat transfer; Condensation; Bundles; Finned Surfaces; Zeotropic Mixture; Horizontal Tubes

Domaines: Mécanique des fluides [physics.class-ph]; Mécanique des fluides [physics.class-ph]

Mourad Belghazi, André Bontemps, Christophe Marvillet. Condensation heat transfer on enhanced surface tubes: experimental results and predictive theory. Journal of Heat Transfer, 2002, 124, pp.754-760. ⟨10.1115/1.1459728⟩. ⟨hal-00184114⟩