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

  • 제27권10호
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  • Pages.497-505
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  • 2015
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  • 1229-6422(pISSN)
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  • 2465-7611(eISSN)
대한설비공학회 (The Society of Air-Conditioning and Refrigerating Engineers of Korea)
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R744-R717 캐스케이드 냉동시스템에서 운전조건 변화에 따른 성능 해석

Performance Simulation of a R744-R717 Cascade Refrigeration System According to Operating Conditions

  • 유지호 (조선대학교 기계공학과 대학원) ;
  • 조홍현 (조선대학교 기계공학과)
  • Ryu, Jiho (Graduate school of Mechanical Engineering, Chosun University) ;
  • Cho, Honghyun (Department Mechanical Engineering, Chosun University)
  • 투고 : 2015.02.12
  • 심사 : 2015.08.12
  • 발행 : 2015.10.10
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초록

The evaporating temperature range required for the low temperature freezing system is from $-50^{\circ}C$ to $-30^{\circ}C$. Since it is difficult to keep the required capacity in a cabinet, it is advantageous to design the system using a cascade refrigeration system. Use of carbon dioxide and ammonia would be advantageous since ammonia is an environment-friendly working fluid and has a high capacity for performance improvement. To investigate the performance characteristics of the R744-R717 cascade refrigeration system, a theoretical model was developed and performance was analyzed according to cascade heat exchanger operating temperature. The optimal cascade R744 condensing temperature was $-5^{\circ}C$, and maximum COP was 1.13 when the temperature difference of the cascade heat exchanger was $5^{\circ}C$. In addition, the total system COP increased by 1.17 when the cascade temperature gap was $3^{\circ}C$ at the middle temperature of $-7.5^{\circ}C$.

키워드

참고문헌

  1. Rezayan, 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. Lee, T. S., Liu C. H., and Chen T. W., 2006, Thermodynamic analysis of optimal condensing temperature of cascade-condenser in $CO_2/NH_3$ cascade refrigeration system, International Journal of Refrigeration, Vol. 29, pp. 1100-1108. https://doi.org/10.1016/j.ijrefrig.2006.03.003
  3. Bhattacharyya, S., Mukhopadhyay S., Kumar A., Khurana R. K., and Sarkar J., 2005, Optimization of a $CO_2-C_3H_8$ cascade system for refrigeration and heating, International Journal of Refrigeration, Vol. 28, pp. 1284-1292. https://doi.org/10.1016/j.ijrefrig.2005.08.010
  4. Dopazo, J. A. and Fernandez-Seara, J., 2011, Experimental evalation of a cascade refrigeration system prototype with $CO_2$ and $NH_3$ for freezing process application, International Journal of Refrigeration, Vol. 34, pp. 257-267. https://doi.org/10.1016/j.ijrefrig.2010.07.010
  5. Nicola, G. D., Polonara, F., Stryjek, R., and Arteconi, A., 2011, Performance of cascade cycles working with blends of $CO_2+$ natural refrigerants, International Journal of Refrigeration, Vol. 34, pp. 1436-1445. https://doi.org/10.1016/j.ijrefrig.2011.05.004
  6. Aminyavari, M., Najafi, B., Shirazi, A., and Rinaldi, F., 2014, Exergetic, economic and environmental (3E) analyses, and multiobjective optimization of a $CO_2/NH_3$ cascade refrigeration system, Applied Thermal Engineering, Vol. 65, pp. 42-50. https://doi.org/10.1016/j.applthermaleng.2013.12.075
  7. Getu, H. M. and Bansal, P. K., 2008, Thermodynamic analysis of an R744-R717 cascade refrigeration system, International Journal of Refrigeration, Vol. 31, pp. 45-54. https://doi.org/10.1016/j.ijrefrig.2007.06.014
  8. Yun, R. and Cho, Y., 2010, Evaluation of the performance for the $CO_2-NH_3$ cascade system and the two statge $CO_2$ systems, Proceedings of the SAREK 2010 Summer Annual Conference, 10-S-144.
  9. Likitthammanit, M., 2007, Experimental investigation of $CO_2/NH_3$ cascade and transcritical $CO_2$ refrigeration systems in supermarkets, Master of Science Thesis, Stockholm, Sweden.
  10. EES : Engineering Equation Solver, 2006. fChart Software Inc.
  11. Gnielinski, V., 1976, New equations for heat and mass transfer in turbulent pipe and channel flow, International Chemical Engineering, Vol. 16, pp. 59-68.
  12. Gungor, K. E. and Winterton R. H. S., 1986, A general correlation for flow boiling in tubes and annuli, International Journal of Heat and Mass Transfer, Vol. 29, pp. 351-358. https://doi.org/10.1016/0017-9310(86)90205-X
  13. Churchill, S. W., 1977, Friction factor equation span all fluid flow regimes, Chemical Engineering, Vol. 7, pp. 91-92.
  14. Duttus, P. W. and Boelter, L. M. K., 1930, University of California Publications on Engineering, Vol. 2, No. 13, pp. 443-461.
  15. Cavallini, A. and Zecchin, R., 1974, A dimensionless correlation for heat transfer in forced convection condensation, Proc. 5th Int. Heat Transfer Conf, Vol. 3, pp. 309-313.
  16. Baik, Y. J., Chang, Y. S., and Kim, Y. I., 2000, Measurement of single and condensation heat transfer coefficients of ammonia in a horizontal tube, SAREK, Vol. 12, No. 6, pp. 561-569.
  17. Wang, C. C., Lee, W. S., and Shen, W. J., 2001, A comparative study of compact enhanced fien-and-tube heat exchangers, International Journal of Heat and Mass Transfer, Vol. 28, pp. 4282-4286.
  18. Petter, N., Filipo, D., Havard, R., and Arne, B., 2004, Measurements and experience on semi-hermetic CO2 compressors, Fifth International Conference on Compressors and Coolants, IIR, Slovak Republic.
  19. Stoecker, W. F., 1998, Industrial Refrigeration Handbook, McGraw Hill.

피인용 문헌

  1. Recent Progress in Air-Conditioning and Refrigeration Research : A Review of Papers Published in the Korean Journal of Air-Conditioning and Refrigeration Engineering in 2015 vol.28, pp.6, 2016, https://doi.org/10.6110/KJACR.2016.28.6.256