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

  • 제25권2호
  • /
  • Pages.101-108
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  • 2013
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  • 1229-6422(pISSN)
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  • 2465-7611(eISSN)
대한설비공학회 (The Society of Air-Conditioning and Refrigerating Engineers of Korea)
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수평미세관내 NH3 비등열전달 특성

Boiling Heat Transfer of Ammonia inside Horizontal Smooth Small Tube

  • 최광일 (전남대학교 냉동공조공학과) ;
  • 오종택 (전남대학교 냉동공조공학과)
  • Choi, Kwang-Il (Department of Refrigeration and Air Conditioning Engineering, Chonnam National University) ;
  • Oh, Jong-Taek (Department of Refrigeration and Air Conditioning Engineering, Chonnam National University)
  • 투고 : 2012.09.06
  • 발행 : 2013.02.10
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초록

This paper is presented an experimental study of flow boiling heat transfer characteristics of ammonia, and is focused on pressure gradient and heat transfer coefficient of the refrigerant flow inside horizontal small tube with inner diameter of 3.0 mm and length of 2000 mm. The direct heating method is applied for supplying heat to the refrigerant, where the test tube is uniformly heated by electric current. The local heat transfer coefficients were obtained over a heat flux range of 20 to $80kW/m^2$, a mass flux range of 50 to $500kg/m^2s$, a saturation temperature range of 0 to $10^{\circ}C$, and quality up to 1.0. The pressure drops increase with increasing mass flux and heat flux, and with decreasing saturation temperature. The heat transfer coefficients increase with increasing mass flux and saturation temperature in middle and high quality region. And the local heat transfer coefficient increase with increasing heat flux in low quality region. The heat transfer coefficient of the experimental result was compared with six existing heat transfer coefficient correlation. A new boiling heat transfer coefficient correlation based on the superposition model for ammonia in small tubes is developed average deviation of -0.17% and mean deviation of 10.85%.

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참고문헌

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