Mixed convection heat transfer between a steam / non- condensable gas mixture and an inclined finned tube bundleĮnergy Technology Data Exchange (ETDEWEB)Ĭachard, F. The numerical results show that the effects of tube diameter, fin height, fin number and helix angle of groove are significant, whereas those of the width of flat portion at the fin tip, the radius of round corner at the fin tip and the fin half tip angle are small. The tubeside heat transfer coefficient was calculated by applying a modified stratified flow model developed by Wang et al.8). Extensive numerical calculations of overall heat transfer from refrigerant R410A flowing inside a horizontal microfin tube to ambient air were conducted for a typical operating condition of the air-cooled condenser. The average increase in the heat transfer coefficient when compared to the smooth tube was found to be as high as 322% w.Įffects of Tube Diameter and Tubeside Fin Geometry on the Heat Transfer Performance of Air-Cooled CondensersĪ theoretical study has been made on the effects of tube diameter and tubeside fin geometry on the heat transfer performance of air-cooled condensers. The herringbone tube results were compared to the smooth and micro- fin tube results. The study focused on the heat transfer coefficients of refrigerants R-22, R-134a and R-407C inside the three tubes.

An experimental investigation was conducted into the heat transfer characteristics of horizontal smooth, micro- fin and herringbone tubes during in- tube condensation. Heat transfer performance during in- tube condensation in horizontal smooth, micro- fin and herringbone tubes

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