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Evaporation Heat Transfer Characteristics of R-290 in a Micro Fin Tube
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 Title & Authors
Evaporation Heat Transfer Characteristics of R-290 in a Micro Fin Tube
Park, Cheol Min; Im, Yong Bin; Lee, Uk Hyeon; Kim, Jong Su;
 
 Abstract
Hydrocarbons are very suitable alternative refrigerants, because of their low GWP and ODP. These alternative refrigerants have been expected to have different heat transfer characteristics from that of HCFC-22 when the phase is changed in the evaporator. Thus, in this study, evaporation heat transfer coefficient, pressure drop and flow regimes of pure R-290(Propane) inside a micro fin tube were experimentally investigated. The length of test section was 500 mm and average diameter of a micro fin copper tube was 8.62 min. Test conditions were as follows: saturation temperature 5℃ mass velocity 100, 150 kg/m2s heat flux 10, 20 kW/m2 inlet quality 0.08 - 1.0. The observed flow regimes agreed with that of Breber's flow map. However, annular flow pattern appeared at the low quality, which was different from the flow pattern in a smooth tube. Pressure drop of R-290 was three times higher than that of R-22 at the same mass velocity and heat flux. Among the local surface temperature difference in circumferential direction of a micro fin tube, temperature difference of upper part was smallest and lower one was largest. Evaporation heat transfer coefficient of R-290 was two times higher than that of R-22 at the same mass velocity and heat flux.
 Keywords
R-290;Micro Fin Tube;Flow Regimes;Pressure Drop;Heat Transfer Coefficient;
 Language
Korean
 Cited by
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