G108 EFFECT OF FIN GEOMETRY ON CONDENSATION OF R134a IN A STAGGERED BUNDLE OF HORIZONTAL FINNED TUBES(Heat exchanger fundamentals)

概要

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Experimental results are presented that show the effect of fin geometry on condensation of refrigerant R134a in a staggered bundle of horizontal finned tubes. Two kinds of conventional low-fin tubes and three kinds of three-dimensional fin tubes were tested. The refrigerant mass velocity ranged from 8 to 23 kg/m^2s and the condensation temperature difference from 1.5 to 12 K. In most cases, the highest performance was obtained by one of the three-dimensional fin tubes. In the case of high mass velocity and high film Reynolds number, however, the highest performance was obtained by one of the low-fin tubes. The results were compared with previous results for bundles of smooth tubes and low-fin tubes.
一般社団法人日本機械学会の論文
2000-10-01