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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Characteristics of Condensing Heat Transfer and Pressure Drop of Hydrocarbon Refrigerants

탄화수소계 냉매의 응축 열전달 및 압력강하 특성

  • Lee Ho-Saeng (Refrigeration and Air-Conditioning Engineering, School of Mechanical Engineering, Pukyong National University) ;
  • Seong Gwang-Hoon (Refrigeration and Air-Conditioning Engineering, School of Mechanical Engineering, Pukyong National University) ;
  • Tong Phan Thanh (Refrigeration and Air-Conditioning Engineering, School of Mechanical Engineering, Pukyong National University) ;
  • Yoon Jung-In (School of Mechanical Engineering, Pukyong National University)
  • Published : 2006.12.10
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Abstract

Experimental results for heat transfer characteristic and pressure gradient of hydrocarbon refrigerants (R-290, R-600a, R-1270) and HCFC refrigerant (R-22) during condensation inside horizontal double pipe heat exchangers are presented. The test sections which have one tube diameter of 12.70 mm with 0.89 mm, 9.52 mm with 0.76 mm, 6.35 mm with 0.13 mm wall thickness are used for this investigation, respectively. The local condensing heat transfer coefficients of hydrocarbon refrigerants were higher than those of R-22. The average condensing heat transfer coefficient increased with the increase of the mass flux. It showed the higher values in hydrocarbon refrigerants than R-22. Hydrocarbon refrigerants have higher pressure drop than R-22 in 10.92 mm, 8 mm and 6.1 mm inner diameters. These results from the investigation can be used in the design of heat transfer exchangers using hydrocarbons as the refrigerant for the air-conditioning systems.

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References

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