Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Analysis of Geometrical Effects on Heat Transfer Characteristics in a Modular Flat Tube-Bundle Heat Exchanger

모듈형 편평원관군 열교환기의 열전달 특성 해석

  • Park, Byung-Kyu (School of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Lee, Joon-Sik (School of Mechanical and Aerospace Engineering, Seoul National University)
  • 박병규 (서울대학교 기계항공공학부) ;
  • 이준식 (서울대학교 기계항공공학부)
  • Published : 2005.11.01
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Abstract

Flow channels with non-circular cross-sections are encountered in a wide variety of heat exchangers. Accurate friction factor and Colburn j factor data are essential for the design and viable applications of such heat exchangers. In this study, an analysis is con ducted on heat transfer and pressure drop characteristics for tube-bundle heat exchanger with various arrangements of tubes, of which their geometry could easily be modified from a circular one in a harsh environment. The parameters investigated are aspect ratio, pitch, and inclined angle of tubes. The results obtained are: (1) Aspect ratio has larger influence on the j and f factor than pitch; (2) As aspect ratio increases, both j and f factors decrease; (3) The high performance is achieved when the pitch and aspect ratio are in the range of 1.5${\~}$2.5 and 1.25${\~}$2.0, respectively; and (4) the inclined arrangements of tubes show unfavorable results for both heat transfer and pressure drop characteristics in spite of the positive possibility of condensate removals in a latent heat recovery system.

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