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Two-phase heat transfer characteristics of R410A-POE oil mixture and R22-mineral oil mixture flow boiling inside a horizontal C-shape curved smooth tube with an outside diameter of 7.0 mm and a curvature ratio of 60 were investigated experimentally. The test results show that the curvature of C-shape curved smooth tube deteriorates the flow boiling heat transfer, and the ratios of the heat transfer coefficients in C-shape curved smooth tube to those in straight smooth tube for R410A-oil mixture and R22-oil mixture are within 0.46-0.74 and 0.74-0.90, respectively. A correlation to predict the heat transfer coefficients of refrigerant-oil mixtures flow boiling inside C-shape curved smooth tube was developed based on mixture properties of refrigerant-oil, and it could agree with 96% of the experimental data within a deviation of plus or minus 20%
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Details
- Original title: Heat transfer characteristics of refrigerant-oil mixtures flow boiling in a horizontal C-shape curved smooth tube.
- Record ID : 2010-0726
- Languages: English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 33 - n. 5
- Publication date: 2010/08
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Indexing
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Themes:
HCFCs;
HFCs;
Heat transfer;
Lubricants - Keywords: R410A; Geometry; Correlation; Heat transfer; Bare pipe; R22; Mixture; Oil; Refrigerant; Heat exchanger; Boiling
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