Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Heat Transfer Coefficients of Concentric Annuli for Testing Heat Transfer Characteristics of Alternative Refrigerants in Tubes

대체냉매 관내 열전달특성 시험을 위한 동심이중원관의 환상유로의 열전달계수

  • KIM, MAN-HOE (School of Mechanical Engineering & IEDT, Kyungpook National University)
  • 김만회 (경북대학교 기계공학부, 공학설계연구소)
  • Received : 2020.12.18
  • Accepted : 2021.02.28
  • Published : 2021.02.28
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Abstract

Accurate measurements of the heat transfer coefficients of concentric annular space for the test section is important to measure the tube-side heat transfer coefficients of working fluids. This paper presents the annular side heat transfer coefficients of concentric annuli with variation of tube diameter ratios using Wilson plot method. The test facility has a straight, horizontal test section with an active length of 3.0 m. Inner/outer diameters of test tubes are 7.0/7.5 and 8.0/8.56 mm, respectively. An outer diameter of annulus side is 16.0 mm. The test results show that convective heat transfer coefficients in annuli increase with annular diameter ratio. The correlations for convective heat transfer coefficients in annuli are also developed.

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References

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