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Influence factors in performance of the two-stage compression transcritical R744 cycle.

Number: pap. ID: 250

Author(s) : ALMEIDA I. M. G., BARBOSA C. R. F.

Summary

This study is a theoretical analysis of a two-stage transcritical cooling cycle using R744 (carbon dioxide) as a refrigerant. The effect of the intercooling process on performance in the two-stage transcritical system is subjected to varying pressures in a gas cooler. Performance comparison between the single stage and two-stage cycle is also subject to the same operating conditions. The authors assessed the effects on system performance of pressure in the gas cooler, isentropic compressor efficiency, amount of intercooling between the two compression stages and discharge temperature of the refrigerant from the gas cooler. Thermodynamic analysis was carried out with CoolPack software, considering an evaporation temperature of -10°C and refrigeration capacity of 5 kW. Results show the coefficient of performance (COP) for the two-stage cycle is superior to the single stage cycle. Two-stage compression was found to reduce energy consumption. On the whole, two-stage compression and the intercooling process are significant in increasing COP for these systems.

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Pages: 9 p.

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Details

  • Original title: Influence factors in performance of the two-stage compression transcritical R744 cycle.
  • Record ID : 30002326
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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