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Forced Convective Boiling of Refrigerant-Oil Mixtures in a Bundle of Enhanced Tubes Having Pores and Connecting Gaps  

Park, Ji-Hoon (Department of Mechanical Engineering, University of Incheon)
Kim, Nae-Hyun (Department of Mechanical Engineering, University of Incheon)
Kim, Do-Young (Department of Mechanical Engineering, University of Incheon)
Byun, Ho-Won (Department of Mechanical Engineering, University of Incheon)
Choi, Yong-Min (Department of Mechanical Engineering, University of Incheon)
Kim, Soo-Hwan (Department of Mechanical Engineering, University of Incheon)
Publication Information
International Journal of Air-Conditioning and Refrigeration / v.17, no.3, 2009 , pp. 81-87 More about this Journal
Abstract
The effect of oil on convective boiling of R-123 in an enhanced tube bundle is experimentally investigated at $26.7^{\circ}C$ saturation temperature. The enhanced tube had pores (0.23 mm diameter) and connecting gaps (0.07 mm width), which had been optimized using pure R-123. The effects of oil concentration (0 to 5%), heat flux (10 to $40\;kW/m^2$), mass velocity (8 to $26\;kg/m2^s$) and vapor quality are investigated. The oil significantly reduces the bundle boiling heat transfer coefficient. With 1% oil, the reduction is approximately 35%. Further addition of oil further reduces the heat transfer coefficient. The data are also compared with the pool boiling counterpart. The reduction in the heat transfer coefficient is smaller in a bundle (convective boiling) than in a pool (single-tube pool boiling), with larger difference at a smaller heat flux. Similar to pure R-123 case, the effects of mass velocity and vapor quality are negligible for the convective boiling of R-123/oil mixture.
Keywords
Enhanced tube; Bundle; Refrigerant-oil mixture; Convective boiling; Pore and connecting gaps;
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  • Reference
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