International Journal of Air-Conditioning and Refrigeration

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Experimental Study on the Performance of Refrigeration System with an Ejector

  • Lee, Won-Hee (LG Electronics Inc.) ;
  • Kim, Yoon-Jo (School of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Kim, Min-Soo (School of Mechanical and Aerospace Engineering, Seoul National University)
  • Published : 2002.12.01
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Abstract

Experimental investigation on the performance of dual-evaporator refrigeration system with an ejector has been carried out. In this study, a hydrofluorocarbon (HFC) refrigerant R134a is chosen as a working fluid. The condenser and two-evaporators are made as concentric double pipes with counter-flow type heat exchangers. Experiments were peformed by changing the inlet and outlet temperatures of secondary fluids entering condenser, high-pressure evaporator and low-pressure evaporator at test conditions keeping a constant compressor speed. When the external conditions (inlet temperatures of secondary fluid entering condenser and one of the evaporators) are fixed, results show that coefficient of performance (COP) increases as the inlet temperature of the other evaporator rises. It is also shown that the COP decreases as the mass flow rate ratio of suction fluid to motive fluid increases. The COP of dual-evapo-rator refrigeration system with an ejector is superior to that of a single-evaporator vapor compression system by 3 to 6%.

Keywords

References

  1. Won, S., Jung, D. S. and Radermacher, R., 1994, An experimental study of the performance of a dual-loop refrigerator/freezer system, Int. J. Refrig., Vol. 17, No. 6, pp. 411-416
  2. Pedersen, P. H., Galster, G., Gulbrandsen, T. and Norgard, J. S., 1987, Design and construction of efficient US-type combined refrigerator/freezer, Int. Congress of Refrigeration, Vol. B, Vienna
  3. Bare, J. C., Gage, C. L., Radermacher, R. and Jung, D., 1991, Simulation of nonazeotropic refrigerant mixtures for use in a dual-circuit refrigerator/freezer with countercurrent heat exchangers, ASHRAE Trans., Vol. 97, Pt. 2, pp. 447-454
  4. Tomasek, M. L. and Radermacher, R., 1995, Analysis of a domestic refrigerator cycle with an ejector, ASHRAE Trans., Vol. 101, Pt. 1, pp. 1431-1438
  5. Sokolov, M. and Hershgal, D., 1990, Enhanced ejector refrigeration cycles powered by low grade heat. Part 1. Systems characterization, Int. J. Refrig., Vol. 13, pp.351-356
  6. Sun, D. W. and Eames, I. W., 1995, Recent developments in the design theories and applications of ejectors - a review, Journal of the Institute of Energy, Vol. 68, pp. 65-79
  7. Nam, S. and Park, K., 1997, Cycle simulation of domestic refrigerator with alternative refrigerant mixtures and two evaporator, Proceeding of the SAREK '97 Annual Winter Conference, pp. 319-326
  8. Lorenz, A. and Meutzner, K., 1975, On application of non-azeotropic two-component refrigerant in domestic refrigerator and home freezer, IIR, Paris
  9. Sun, D. W., Eames, I. W. and Aphornratana, S., 1996, Evaluation of a nove combined ejector-absorption refrigeration cycle- I: computer simulation, Int. J. Refrig., Vol. 19, No. 3, pp. 172-180 https://doi.org/10.1016/0140-7007(96)00010-2
  10. Park, D. and Jeong, S. Y., 2000, An experimental study on the performance of a liquid-vapor ejector with water, Korean J. Air-Conditioning and Refrigeration Engineering, Vol. 12, No. 4, pp.345-353