低圧力状態における表面加工伝熱管の狭い空間沸騰熱伝達特性の比較 : ローレット加工管とクロムメッキ管の場合

概要

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This paper presents an experimental study dealing with basic boiling heat transfer research concerning a solar-powered absorption chiller. Two kinds of surface-worked (roll-worked and chromium-electroplated mirror face) heat transfer tubes were tested in bulk liquid or in annual narrow spaces under several reduced-pressure conditions, and the saturated boiling heat transfer characteristics were determined. The data obtained of the two kinds of tubes were compared under the same conditions. The experimental results indicated that the roll-worked tubes in bulk liquid indeed receive much greater boiling heat transfer promotion than that in the case of the mirror-face tube. In the case of narrow spaces, the mirror-face tubes are considerably heat-transfer-enhanced in comparison to the case without narrow space, but the roll-worked tubes with annual narrow spaces are not remarkably enhanced compared to the case without narrow space.
一般社団法人日本機械学会の論文
1993-01-25