Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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Heat Transfer Characteristics of R-1270 using 12.7mm Inner Fin Tube

12.7mm 내면핀관을 이용한 R-1270의 열전달 특성

  • 윤정인 (부경대학교 기계공학부) ;
  • 성광훈 (부경대학교 대학원 냉동공조공학과) ;
  • 심규진 (부경대학교 대학원 냉동공조공학과) ;
  • 진병주 (부경대학교 대학원 냉동공조공학과) ;
  • 백승문 (부경대학교 대학원 냉동공조공학과) ;
  • 문춘근 (부경대학교 대학원 냉동공조공학과)
  • Published : 2008.05.31
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Abstract

This paper deals with the heat transfer characteristics of R-290 (Propane), R-600a (Iso-butane) and R-1270 (Propylene) as an environment friendly refrigerant and R-22 as a HCFC's refrigerant for evaporating. The experimental apparatus has been set-up as conventional vapor compression type refrigeration and air-conditioning system. The test section is a horizontal double pipe heat exchanger. Evaporating heat transfer measurements were performed for smooth tube with the outer diameters of 12.70, 9.52 and 6.35 mm and micro-fin tube 12.70 mm, respectively. For the smooth and micro-fin tubes measured in this study, the evaporating heat transfer coefficient was enhanced according to the increase of the mass flux and decrease of the tube diameter. The local evaporating heat transfer coefficients of hydrocarbon refrigerants were superior to those of R-22 and the maximum increasing rate of heat transfer coefficient was found in R-1270. The average evaporating heat transfer coefficients in hydrocarbon refrigerants showed 20 to 28% higher values than those of R-22. Also, the evaporating heat transfer coefficients of R-22 in the tube diameter of the 12.70 mm smooth and micro-fin tube were compared. Generally, the local heat transfer coefficients for both types of tubes increased with an increase of the mass flux. The heat transfer enhancement factor (EF) between smooth and micro-fin tube varied from 1.9 to 2.7 in all experimental conditions.

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References

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