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 Analysis of R404A Refrigeration System with Internal Heat Exchanger Using R744 as a Secondary Refrigerant

R744를 2차 냉매로 사용하는 내부열교환기 부착 R404A 냉동시스템의 성능 분석

  • Oh, Hoo-Kyu (Department of Refrigeration and Air-conditioning Engineering, Pukyong National University) ;
  • Son, Chang-Hyo (Department of Refrigeration and Air-conditioning Engineering, Pukyong National University) ;
  • Yi, Wen-Bin (Graduate School of refrigeration and Air-conditioning Engineering, Pukyong National University) ;
  • Jeon, Min-Ju (Department of Refrigeration and Air-conditioning Engineering, Pukyong National University)
  • 오후규 (부경대학교 냉동공조공학과) ;
  • 손창효 (부경대학교 냉동공조공학과) ;
  • 이문빈 (부경대학교 냉동공조공학과 대학원) ;
  • 전민주 (부경대학교 냉동공조공학과)
  • Received : 2013.07.18
  • Published : 2013.10.10
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Abstract

A thermodynamic analysis of the R404A refrigeration system with an internal heat exchanger using R744 as a secondary refrigerant is presented in this paper to optimize the design for operating parameters of the system. The main results are summarized as follows: The COP increases with increasing subcooling and superheating degree of R404A, internal heat exchanger and compression efficiency of the R404A cycle and evaporating temperature of the R744 cycle and decreasing temperature difference of the cascade heat exchanger and condensing temperature of the R404A cycle. The mass flow ratio decreases with increasing evaporating temperature of the R744 cycle and internal heat exchanger efficiency of the R404A cycle and decreasing subcooling and superheating degree of the R744 cycle, temperature difference of the cascade heat exchanger and condensing temperature of the R404A cycle.

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References

  1. Reyayan, O. and Behbahaninia, A., 2011, Thermoeconomic optimization and exergy analysis of $CO_2/NH_3$ cascade refrigeration systems, Energy, Vol. 36, pp. 888-895. https://doi.org/10.1016/j.energy.2010.12.022
  2. Wang, K., Eisele, M., Hwang, Y., and Radermacher, R., 2010, Review of secondary loop refrigeration systems, International Journal of Refrigeration, Vol. 33, pp. 212-234. https://doi.org/10.1016/j.ijrefrig.2009.09.018
  3. Sawalha, S., 2008, Theoretical evaluation of transcritical $CO_2$ systems in supermarket refrigeration. Part I : Modeling, simulation and optimization of two system solutions, International Journal of Refrigeration, Vol. 31, pp. 516-524. https://doi.org/10.1016/j.ijrefrig.2007.05.017
  4. Lim, H. Y., Choi, Y. D., Kim, Y. C., and Kim, M. S., 2003, Development of a new correlation for the heat transfer coefficient of turbulent supercritical carbon dioxide flow, Society of air-conditioning and refrigerating engineers of Korea, Vol. 15, No. 4, pp. 274-286.
  5. Choi, Y. C., Kang, B. H., and Kim, S. H., 2004, An experimental study on heat transfer and pressure drop characteristics during supercritical process of carbon dioxide in a horizontal tube, Society of air-conditioning and refrigerating engineers of Korea, Vol. 16, No. 5, pp. 414-420.
  6. Son, C. H., Lee, D. G., Kim, Y. L., and Oh, H. K., 2004, Evaporative heat transfer characteristics of carbon dioxide in a horizontal tube, Society of air-conditioning and refrigerating engineers of Korea, Vol. 16, No. 12, pp. 1134-1139.
  7. Park, S. N. and Kim, M. S., 2001, A study on autocascade refrigeration system using carbon dioxide and R134a mixture, International Journal of Air-conditioning and Refrigeration, Vol. 9, No. 1, pp. 39-49.
  8. Veiby, O. J., 2003, Internal Records, Documentation in the ICA Supermarket Chain in Norway 2003, Oslo, Norway.
  9. 1993, Sintef Vedleggsrapport til STF11 A93051 Brukeroversikt- Kuldmedier I Norge, SNTEF report no. STF11 F93058, Trondheim, Norway.