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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Condensation heat transfer characteristics of hydrocarbon refrigerants R-290 and R-600a inside horizontal tubes

탄화수소계 냉매 R-290, R-600a의 수평관내 응축 열전달 특성에 관한 연구

  • 박승준 (부경대학교 대학원 냉동공학과) ;
  • 박기원 (여수대학교 냉동공학과) ;
  • 노건상 (동명대학 가스냉동과) ;
  • 정재천 ((주) 한서 엔지니어링) ;
  • 오후규 (부경대학교 공과대학 냉동공조공학과)
  • Published : 2000.01.01
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Abstract

An experimental study on the condensation heat transfer coefficients of R-22, R-290 and R-600a inside horizontal tube was performed. Heat transfer measurements were performed for smooth tube with inside diameter of 10.07 mm and outside diameter of 12.07 mm and inner grooved tube having 75 fins whose height is 0.25 mm. This study was performed for condensation temperatures were from 308 K to 323 K, and mass velocity of $51 kg/m^2s - 250kg/m^2s$. The test results showed that the local condensation heat transfer coefficients increased as the mass flux increased, and also the effect of mass flow rate on heat transfer coefficients of R-290 was less than R-22. In addition, heat transfer coefficient of R-22 increased to a larger extent than R-290 and R-600a as the mass flow rate increased. Average condensation heat transfer coefficients of natural refrigerants were superior to that of R-22. The present results had a good agreement with Cavallini-Zecchin's correlation for smooth and inner grooved tubes.

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References

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