Proceedings of the SAREK Conference (대한설비공학회:학술대회논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Experimental studies on the evaporative heat transfer of R32/290 mixtures in a horizontal smooth tube

평활관 내 R32/290 혼합냉매의 증발열전달 특성에 관한 실험적 연구

  • Cho, Jin-Min (School of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Kim, Ju-Hyok (DA laboratory, LG electronics, Inc.) ;
  • Yoon, Seok-Ho (School of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Kim, Min-Soo (School of Mechanical and Aerospace Engineering, Seoul National University)
  • 조진민 (서울대학교 기계항공공학부) ;
  • 김주혁 (LG전자(주) DA연구소) ;
  • 윤석호 (서울대학교 기계항공공학부) ;
  • 김민수 (서울대학교 기계항공공학부)
  • Published : 2005.11.25
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Abstract

Because of environmental issues caused by CFC, HCFC or HFC refrigerants, new alternative refrigerants has gained a significant attention. This paper presents experimental information on heat transfer coefficient and pressure drop behavior during evaporation process of R32/290 mixtures in a horizontal smooth tube. A smooth tube with outer diameter of 5 mm and length of 5 m was selected as a test tube. Heat transfer coefficients and pressure drop characteristics were measured for a range of mass fluxes from 497 to 994 $kg/m^2s$, heat fluxes from 12 to 20 $kW/m^2$ and for several mixture compositions(100/0, 75/25, 58.4/41.6, 2s/75, 100/0 by wt% of R32/290). The differences of measured heat transfer characteristics among various R32/290 refrigerant mixtures were analyzed for various compositions.

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