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

  • 제12권12호
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  • Pages.1049-1056
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  • 2000
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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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수평관에서 이원 혼합냉매의 응축 열전달계수

Condensation Heat Transfer Coefficients of Binary Refrigerant Mixtures on a Horizontal Smooth Tube

  • 발행 : 2000.12.01
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초록

In this study, condensation heat transfer coefficients(HTCs) of 2 nonazeotropic refrigerant mixtures of HFC32/HFC134a and HFC134a/HCFC123 at various compositions were measured on a horizontal smooth tube. All data were taken at the vapor temperature of 39$^{\circ}C$ with a wall subcooling of 3~8K. Test results showed that HTCs of tested mixtures were 11.0~85.0% lower than the ideal values calculated by the mass fraction weighting of the pure components HTCs. Thermal resistance due to the diffusion vapor film was partly responsible for the significant reduction of HTCs with these nonazeotropic mixtures. The measured data were compared against the predicted ones by Colburn and Drew\`s film model and a good agreement was observed.

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참고문헌

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