Influence of lubricant oil on heat transfer performance of refrigerant flow boiling inside small diameter tubes. Part II: Correlations

Journal Article · Mon Oct 15 04:00:00 EDT 2007 · Experimental Thermal and Fluid Science

DOI:https://doi.org/10.1016/J.EXPTHERMFLUSCI.2006.10.013· OSTI ID:20961984

Wei, Wenjian; Ding, Guoliang; Hu, Haitao ^[1]; Wang, Kaijian ^[2]

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1. Refrigeration and Cryogenics Institute, Department of Power and Energy Engineering, Shanghai JiaoTong University, Shanghai 200030 (China)
2. Fujitsu General Institute of Air-Conditioning Technology Limited, Kawasaki 213-8502 (Japan)

The predictive ability of the available state-of-the-art heat transfer correlations of refrigerant-oil mixture is evaluated with the present experiment data of small tubes with inside diameter of 6.34 mm and 2.50 mm. Most of these correlations can be used to predict the heat transfer coefficient of 6.34 mm tube, but none of them can predict heat transfer coefficient of 2.50 mm tube satisfactorily. A new correlation of two-phase heat transfer multiplier with local properties of refrigerant-oil mixture is developed. This correlation approaches the actual physical mechanism of flow boiling heat transfer of refrigerant-oil mixture and can reflect the actual co-existing conditions of refrigerant and lubricant oil. More than 90% of the experiment data of both test tubes have less than {+-}20% deviation from the prediction values of the new correlations. (author)

• OSTI ID: 20961984
• Journal Information: Experimental Thermal and Fluid Science, Journal Name: Experimental Thermal and Fluid Science Journal Issue: 1 Vol. 32; ISSN 0894-1777; ISSN ETFSEO
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
42 ENGINEERING
AIR CONDITIONERS
BOILING
CORRELATIONS
ENERGY EFFICIENCY
FORECASTING
HEAT EXCHANGERS
HEAT TRANSFER
LUBRICATING OILS
MIXTURES
PERFORMANCE
REFRIGERANTS
REFRIGERATORS
TUBES
TWO-PHASE FLOW