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An Experimental Study on Pool Boiling Heat Transfer Enhancement of Structured Tubes Having Three-Dimensional Roughness

삼차원 조도를 가진 성형가공관의 R-134a 풀비등 열전달 촉진에 관한 실험적 연구

  • Received : 2016.03.12
  • Accepted : 2016.04.14
  • Published : 2016.05.10

Abstract

Enhanced tubes are widely used in air-conditioning and process industries. Structural tubes having three-dimensional roughness are well known to be able to significantly enhance pool boiling heat transfer of refrigerants. In this study, five structural enhanced tubes having different fin density, fin height, and fin gap width were tested using R-134a. Results showed that the heat transfer coefficient was increased with increased fin density. Within test range, the effect of fin height on pool boiling heat transfer coefficient was insignificant. The heat transfer coefficients of the optimum configuration (2047 fpm, 0.21 mm gap width) tube were lower than those of other commercial enhanced tubes. This might be due to the larger fin gap width of the present enhanced tube.

Keywords

Structured tube;Heat transfer enhancement;Pool boiling;Three-dimensional roughness;R-134a

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