Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Performance Characteristics of Accumulator Heat Exchangers with Operating Conditions of a Refrigeration System

냉동시스템의 운전조건에 따른 열교환기 내장형 어큐뮬레이터의 성능 특성

  • Kang, Hoon (Department of Mechanical Engineering, Korea University) ;
  • Park, Cha-Sik (Graduate School of Mechanical Engineering, Korea University) ;
  • Jeon, Jong-Ug (Graduate School of Mechanical Engineering, Korea University) ;
  • Kim, Yong-Chan (Department of Mechanical Engineering, Korea University)
  • 강훈 (고려대학교 기계공학과) ;
  • 박차식 (고려대학교 기계공학과 대학원) ;
  • 전종욱 (고려대학교 기계공학과 대학원) ;
  • 김용찬 (고려대학교 기계공학과)
  • Published : 2006.12.10
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Abstract

The applications of multi air-conditioners into multiplex and high-rise buildings have been increased by replacing central air-conditioning systems. The pipe length and altitude difference between the indoor and outdoor units can be increased based on installation conditions, which may increase the possibility of flash gas generation at the expansion device inlet. The flash gas generation causes rapid reduction of refrigerant flow rate passing through the expansion device, yielding lower system efficiency. Accumulator heat exchangers have been widely used in multi air-conditioners in order to minimize flash gas generation and obtain system reliability. However, the studies on the heat transfer characteristics and pressure drops of accumulator heat exchangers are very limited in open literature. In this study, the heat transfer rates and pressure drops of accumulator heat exchangers were measured with refrigerant flow rate and operating conditions by using R-22. The heat transfer rate increased with the increase of refrigerant flow rate, while subcooling decreased. The heat transfer rate enhanced with the reduction of inlet superheat and subcooling due to the increased temperature difference between the accumulator and inner heat exchanger.

Keywords

References

  1. Meyer, J. P. and Wood, C. W., 2001, The design and experimental verification of heat exchanger accumulators used in small commercially available air conditioning systems, Int. J. Energy Research, Vol. 25, pp. 911-925 https://doi.org/10.1002/er.728
  2. Mei, V. C., Chen, F. C. and Chen, T. D., 1996, Experimental study of a liquid overfeeding window air conditioner, ASHRAE Transactions, Vol.102, pp.63-67
  3. Navarro-Esbri, J. Cabello, R. and Torrella, E., 2005, Experimental evaluation of the internal heat exchanger influence on a vapour compression plant energy efficiency working with R22, RI34a and R407C, Energy, Vol. 30, pp. 621-636 https://doi.org/10.1016/j.energy.2004.05.019
  4. Domanski, P. A, Didion, D. A and Doyle, J. P., 1994, Evaluation of suction-line / liquidline heat exchange in the refrigeration cycle, Int. J. Refrigeration, Vol. 17, pp.487-493 https://doi.org/10.1016/0140-7007(94)90010-8
  5. Klein, S. A, Reindl, D. T. and Brownell, K, 2000, Refrigeration system performance using liquid-suction heat exchangers, Int. J. Refrigeration, Vol. 23, pp, 588-596 https://doi.org/10.1016/S0140-7007(00)00008-6
  6. Aprea, C., Ascani, M. and Rossi, F., 1999, A criterion for predicting the possible advantage of adopting a suction/liquid heat exchanger in refrigerating system, Applied Thermal Engineering, Vol. 19, pp.329-336 https://doi.org/10.1016/S1359-4311(98)00070-2
  7. Gabrielli, C. and Vamling, L., 1998, Changes in optimal distribution of heat exchanger area between the evaporator and suction gas heat exchanger when replacing R22 with R407C, Int. J. Refrigeration, Vol. 28, pp. 440-451
  8. ASHRAE, 1986, ASHRAE Guideline 2: Engineering analysis of experimental data, ASHRAE, Atlanta (GA)
  9. Kang, H., 2006, The performance characteristics of a refrigeration system with an accumulator heat exchanger, DS thesis, Korea University, Seoul, Korea