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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Experimental Study of An Indirect-Refrigeration System with Carbon Dioxide

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  • Kim, Yoonsup (Department of Mechanical Engineering, Hanbat National University) ;
  • Baik, Wonkeun (Department of Mechanical Engineering, Hanbat National University) ;
  • Yun, Rin (Department of Mechanical Engineering, Hanbat National University)
  • 김윤섭 (한밭대학교 기계공학과) ;
  • 백원근 (한밭대학교 기계공학과) ;
  • 윤린 (한밭대학교 기계공학과)
  • Received : 2016.03.16
  • Accepted : 2016.04.15
  • Published : 2016.05.10
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Abstract

Experimental studies for an indirect R404A-$CO_2$ refrigeration system and a direct R404A refrigeration system were conducted. The configurations of the indirect R404A-$CO_2$ refrigeration system are a R404A refrigeration system as a top cycle and a circulating $CO_2$ system as a bottom cycle. The direct R404A system was modified from indirect R404A-$CO_2$ refrigeration system by removing circuit for $CO_2$ circulation. Various tests for both systems were conducted by changing load side brine temperature from 0 to 5 and $10^{\circ}C$ with cooling brine temperatures for R404A system at 15, 20, or $25^{\circ}C$. The indirect R404A-$CO_2$ refrigeration system showed the highest COP when load side brine temperature was at $10^{\circ}C$ in the evaporator and at cooling brine temperature of $15^{\circ}C$. The COP of 3.04 under that condition was the highest. This indirect R404A-$CO_2$ refrigeration system showed 9.02% higher COP than the direct R404A system that had increased pipeline length of 15 m, which simulated actual installation in a supermarket.

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References

  1. Likitthammanit, M., 2007, Experimental investigation of $NH_3/CO_2$ cascade and transcritical $CO_{2}$ refrigeration systems in supermarkets, Master of Sience Thesis, Stockholm, Sweden.
  2. Alessandro da Silva, Enio Pedone Bandarra Filho, 2011, Comparison of a R744 cascade refrigeration system with R404A and R22 conventional systems for supermarkets, Applied Thermal Engineering, Vol. 41, pp. 30-35.
  3. Yukinobu IKEMOTO, 2009, Outline and performance evaluation of R410A/$CO_{2}$ cascade heat pump systems, Magazine of the SAREK, Vol. 39 No. 11, pp. 40-49.
  4. Yoonsup Kim, Rin Yun, 2015, Performance of Carbon Dioxide System for Freezing and Refrigeration, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 27, pp. 81-86. https://doi.org/10.6110/KJACR.2015.27.2.081