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Condensation of R-134a on Horizontal Enhanced Tubes Having Three-Dimensional Roughness

Nae-Hyun Kim

Department of Mechanical Engineering, Incheon National University, #12-1 Songgo-Dong, Yeonsu-Gu, Incheon, 406-772, Korea

E-mail Address: knh0001@incheon.ac.kr

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https://doi.org/10.1142/S2010132516500139Cited by:6 (Source: Crossref)

Abstract

Enhanced tubes are widely used in shell and tube condensers of refrigeration, air-conditioning and process industries because of their high heat transfer performance. In this study, condensation heat transfer tests were conducted for four three-dimensional enhanced tubes having different fin density and fin height using R-134a. The satuartion temperature was 40 $^{\circ}$ $^{\circ}$ C. The heat transfer was significantly enhanced by the present enhanced geometry. At 5K wall subcooling, the enhancement ratio is 6.3 for 1654fpm, 4.6 for 1575fpm, 4.0 for 1496fpm and 3.3 for 1102fpm tubes. Within the geometric variation of the present study, the condensation heat transfer coefficient increased with the increase of fin density and of fin height. The heat transfer coefficients of the 1654fpm tube were approximately the same as those of the commercial three-dimensional enhanced tube Turbo-C.

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