Influence of Fin Parameter and Winding Pattern on Heat and Mass Transfer Characteristics of a Vertical Absorber with Spirally Wound Fir-Finned Tube

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  • 針状らせんフィン付き垂直流下液膜式吸収器におけるフィン形状因子の熱物質移動特性に及ぼす影響
  • シンジョウ ラセン フィン ツキ スイチョク リュウカ エキマクシキ キュウシュウキ ニ オケル フィン ケイジョウ インシ ノ ネツ ブッシツ イドウ トクセイ ニ オヨボス エイキョウ

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Abstract

Absorption experiments were conducted to investigate the influences of fin parameters such as winding pattern, height and pitch on heat and mass transfer characteristics in an absorber with a spirally finned tube. A double-stacked type tube showed better performance than a single-stacked type. In the single-stacked type, film heat transfer coefficient and mass transfer coefficient increased with increasing fin height, and an optimum fin pitch was found to exist. The fin winding pattern had a bigger effect on heat transfer rate than on absorption rate. From a practical standpoint, a comparative study was conducted on heat and mass transfer performance based on the weight of the finned tube. From absorption rate and heat transfer rate per tube weight, it was demonstrated that the single stacked fin with fin height of 8 mm and fin pitch of 8.6 mm or 10.6 mm has the best performance. Boost temperature characteristics increased with increasing weight of the fir-finned tube, reaching 26 K for the double-stacked type and 23–25 K for the single-stacked type.

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