Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Performance comparison of cascade refrigerator and two-stage compression refrigerator

캐스케이드 냉동시스템과 2단 압축 1단 팽창식 냉동 시스템의 성능 비교

  • Son, Chang-Hyo (Department of Refrigeration and Air-conditioning Engineering, Pukyoung National University)
  • 손창효 (부경대학교 냉동공조공학과)
  • Received : 2013.09.27
  • Accepted : 2014.02.05
  • Published : 2014.02.28
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Abstract

In order to obtain a low evaporation temperature ranging from $-30^{\circ}C{\sim}-50^{\circ}C$, a cascade refrigeration system and two-stage compression one-stage expansion refrigeration system is required. However, the research results of performance comparison of these refrigeration system are very scarce. This paper were compared the performance characteristics of R744-R404A cascade refrigeration system and R404A two-stage compression refrigeration system. The COP of R404A two-stage compression refrigeration system is about 36~57% greater than that of R744-R404A cascade refrigeration system in the range of evaporation temperature of $-30^{\circ}C{\sim}-50^{\circ}C$. But R404A two-stage compression refrigeration system is unstable because COP is significantly changed when evaporating temperature and compressor efficiency decreased. In particular, when compressor efficiency decreased, COP is significantly decreased. In this case, not efficient for long-term use. Whereas R744-R404A cascade refrigeration system using natural refrigerants. Therefore, it is environmentally friendly. And this system is high-efficiency refrigeration system. The reason it can be configured by selecting the suitable refrigerant at high-temperature side and low-temperature side. From the above results, select the appropriate low temperature refrigeration system by considering the environmental and performance aspects.

$-30^{\circ}C{\sim}-50^{\circ}C$ 범위의 저온 증발온도를 얻기 위해서는 2단 압축 1단 팽창식 냉동 시스템이나 캐스케이드 냉동 시스템이 필요하다. 하지만 이러한 냉동시스템의 성능 비교에 대한 연구 결과는 대단히 부족한 실정이다. 본 논문은 R744-R404A용 캐스케이드 냉동시스템과 R404A용 2단 압축 1단 팽창식 냉동 시스템의 성능을 서로 비교한 것이다. $-30^{\circ}C{\sim}-50^{\circ}C$의 증발온도 범위에서 2단 압축 1단 팽창식 냉동시스템의 성능계수가 캐스케이드 냉동시스템 보다 약 36%~57% 정도 높다. 하지만, 2단 압축 1단 팽창식 냉동 시스템의 경우 증발온도와 압축효율 감소시에 성능계수의 변화가 커서 안정적이지 못하다. 특히, 압축효율 감소시에 성능계수가 크게 감소하는데, 이는 장기간 냉동 시스템의 사용시에 단점이 될 수 있다. 반면, R744-R404A용 캐스케이드 냉동 시스템은 자연냉매를 사용하여 친환경적이며, 고온과 저온 사이클에 사용되는 냉매의 적절한 선택에 의해서 다양한 온도영역에서 고효율 냉동 시스템을 구성할 수 있다. 위의 결과로부터, 성능과 환경적인 측면을 고려하여 용도에 따라 적합한 저온 냉동시스템을 선택하는 것이 좋으리라 판단된다.

Keywords

References

  1. S. Sawalha, "Theoretical evaluation of trans-critical $CO_2$ systems in supermarket refrigeration. Part I: Modeling, simulation and optimization of two system solutions," ASHRAE J., vol. 47, no. 8, pp. 26-30, 2005.
  2. S. N. Park and M. S. Kim, "Experiment and simulation on the performance of an autocascade refrigeration system using carbon dioxide as a refrigerant," School of Mechanical and Aerospace Engineering, Seoul National University, Seoul, pp. 151-742, 1999.
  3. J. A. Dopazo, J. Fernandez-Seara, Sieres, F. J. Uhia, "Theoretical analysis of a $CO_2-NH_3$ cascade refrigeration system for cooling applications at low temperatures," Applied Thermal Engineering, vol. 29, pp. 1577-1583, 2009. DOI: http://dx.doi.org/10.1016/j.applthermaleng.2008.07.006
  4. A. Messineo and G. Panno, "LNG cold energy use in agro-food industry: a case study in Sicity," Journal of Natural Gas Science and Engineering, vol. 3, pp. 356-363, 2011. DOI: http://dx.doi.org/10.1016/j.jngse.2011.02.002
  5. P. K. Bansal and S. Jain, "Cascade systems: past, present, and future", ASHRAE Trans., vol. 113, no. 1, pp. 245-252 (DA-07-027), 2007.
  6. J. M. Winkler, V. Aute, R. Radermacher and D. Shapiro, "Simulation and Validation of a R404A/$CO_2$ cascade refrigeration system", Proceedings of the international refrigeration and air conditioning conference at Purdue, vol. 12, no. 1, p. 2273, 2008.
  7. A. Messineo, "R744-R717 Cascade Refrigeration System: Performance Evaluation compared with a HFC Two-Stage System", Energy Procedia, vol. 14, pp. 56-65, 2012. DOI: http://dx.doi.org/10.1016/j.egypro.2011.12.896
  8. R. Liopis, E. Torrella, R. Cabello, D. Sanchez "Performance evaluation of R404A and R507A refrigerant mixtures in an experimental double-stage vapour compression plant", Department of Mechanical Engineering and Construction Campus de Riu Sec, Jaume I University, E-12071 Castellon, Spain, pp. 1546-1553, 2010.
  9. E. Torrella, J. A. Larumbe, R. Cabello, R. Llopis, D. Sanchez, "A general methodology for energy comparison of intermediate configurations in two-stage vapour compression refrigeration systems", Department of Applied Thermodynamics, Camino de Vera, 14, Polytechnic University of Valencia, E-46022 Valencia, Spain, pp. 4119-4124, 2011.
  10. EES: Engineering Equation Solver, fChart Software Inc, 2006.
  11. W. Bingming, W. Guagen, L. Jianfeng, X. Ziwen, "Experimental investigation on the performance of $NH_3/CO_2$ cascade refrigeration system with twin-screw compressor", School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shannxi 710049, China, pp. 1358-1365, 2012.
  12. H. M. Getu and P. K. Bansal, "Thermodynamic analysis of an R744-R717 cascade refrigeration system", Department of Mechanical Engineering, The University of Auckland, Private Bag 92019, Auckland, New Zealand, pp. 45-54, 2008.