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International journal of refrigeration = Revbue internationale du froid v.74, 2017년, pp.333 - 344   SCI SCIE
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Etude de l'effet d'un systEme de recirculation de liquide A Ejecteur sur la performance d'un refroidisseur d'eau A film tombant avec du R134a
Investigation on the effect of ejector liquid recirculation system on the performance of falling-film water chiller with R134a

Li, Ying Lin (Corresponding author. Engineering Laboratory for Energy System Process Conversion & Emission Control Technology of Jiangsu Province, Nanjing Normal University, Nanjing 210042, China. Fax: +86 (0)25 85481140. ); Wang, Ke ( ); Wu, Wei ( ); Xia, Xue Ying ( ); Niu, Bao Lian ( ); Zhang, Zhong Bin ( );
  • 초록  

    Abstract To analyze the influence of liquid spraying flow rate on the performance of a falling-film evaporator with R134a, the finite difference model of the horizontal-tube falling-film evaporator is established, and a falling-film air-cooled water chiller with ejector liquid recirculation system (LRS) is presented; then the comparison between numerical simulation and experimental tests are performed. The analysis results show that the experimental and numerical evaporating capacities increase 9.5% and 6.7%, respectively, when the liquid recirculating ratio R l increases from 1.0 to 1.21; and the deviation between the experimental and numerical capacities of the evaporator is about 3.3%. And that the evaporated liquid flow rate rises quickly at first and then increases slightly as R l increases. Moreover, the results show that the optimum value of R l is about 1.2, the corresponding value of integrated falling-film factor φ with about 0.85. This suggests that attempting to eliminate completely the dryout patch outside of tubes is unadvisable. Highlights Liquid refrigerant recirculation system based ejector is proposed. A test facility of horizontal-tube falling-film water chiller is presented. Impact from liquid recirculating ratio on evaporator capacity is performed. The optimum of liquid recirculating ratio is about 1.2. Trying to wipe out dryout patch completely is not commendatory.


  • 주제어

    Horizontal-tube falling film .   Ejector .   Liquid recirculating ratio .   Integrated falling-film factor .   Film tombant de tube horizontal .   Éjecteur .   Ratio de recirculation de liquide .   Facteur de film tombant intégré.  

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