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In this study, external condensation heat transfer coefficients (HTCs) of nonazeotropic refrigerant mixtures of HFC-32/HFC-134a and HFC-134a/HCFC-123 at various compositions were measured on a horizontal smooth tube with a 19 mm outside diameter. All data were taken at a vapour temperature of 39 °C with wall subcooling of 3-8 °C. Results showed that the HTCs of the tested mixtures were 19.4-85.1% lower than the ideal values calculated by the mole fraction weighting of the HTCs of the pure components. Thermal resistance due to the diffusion vapour film seemed to be partly responsible for the significant reduction in HTCs with these nonazeotropic mixtures.
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Details
- Original title: Condensation heat transfer coefficients of halogenated binary refrigerant mixtures on a smooth tube.
- Record ID : 2004-1559
- Languages: English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 26 - n. 7
- Publication date: 2003/11
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Indexing
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Themes:
Thermodynamics and changes of state;
Blends - Keywords: Heat transfer coefficient; Bare pipe; Binary mixture; Refrigerant; Condensation
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