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Theoretical analysis of performance of a two-stage compression CO2 cycle with two different evaporating temperatures.

Author(s) : SHIN E., PARK C., CHO H.

Type of article: Article, IJR article

Summary

The performance characteristics of a two-stage CO2 system with two different evaporating temperatures have been analyzed through simulation with such variables as outdoor air temperature, outdoor air velocity, and 2nd-stage EEV opening. The simulation of performance of the two-stage compression cycle indicated that the cooling COP decreased by 22.9, 16.1, 18.9, and 19.4%, respectively, for frostless cooling capacities of 0, -10, -20, and -30%, when the outdoor temperature was increased. The system had a maximum cooling COP for the frostless cooling capacity of -10%, or -20% when the 2nd-stage EEV opening was 56%. The maximum cooling COPs for the non-frost and the frostless cooling capacity of -30% were 1.45 and 1.003, respectively, when the 2nd-stage EEV opening was 52%. The system performance was very sensitive to the variation of 2nd-stage EEV opening.

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Pages: 164-175

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Details

  • Original title: Theoretical analysis of performance of a two-stage compression CO2 cycle with two different evaporating temperatures.
  • Record ID : 30012748
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 47
  • Publication date: 2014/11

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