Condensation of R134a in a Staggered Bundle of Horizontal Finned Tubes

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  • 冷媒R134aの千鳥配列フィン付き管群内凝縮
  • レイバイ R134a ノ チドリ ハイレツ フィン ツキ カングン ナイ ギョウシュク

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Abstract

Experimental results are presented that show the effect of fin geometry on the condensation of refrigerant R134a in a staggered bundle of horizontal finned tubes. Two types of conventional low-fin tubes and three types of three-dimensional fin tubes were tested. The refrigerant mass velocity ranged from 8 to 23kg/m^2s and the condensation temperature difference from 1.5 to 12K. 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 experimental results for bundles of smooth tubes and low-fin tubes.

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