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Theoretical analysis of CO2 transcritical system with parallel compression for heat recovery and air conditioning in supermarkets.

Number: pap. n. 530

Author(s) : KARAMPOUR M., SAWALHA S.

Summary

This paper theoretically analyses a CO2 trans-critical booster system in which parallel compression, heat recovery and air conditioning are integrated. The performance of the system is studied in various running modes using flash gas by-pass (FGBP) or parallel compression (PC). These running modes include summer cases with/without air conditioning and winter case with heat recovery. The results show that parallel compression is more efficient than flash gas by-pass in summer cases; the increase in COPtot is up to 14% comparing the best cases for PC and FGBP. The increase in COPtot in winter heat recovery mode is marginal, less than 4-6% and hardly-feasible in practice. Comparing the AC function of the CO2 system with a conventional HFC air conditioning system, it has been found that CO2 system is more efficient in moderate ambient temperatures lower than 20-25°C. The CO2 system’s AC performance is less efficient than HFC solution in ambient temperatures higher than 25°C. To conclude, an integrated CO2 trans-critical booster system can to provide the entire supermarket’s refrigeration and air conditioning demands for cold-mild climates with comparable or higher energy efficiency than the HFC solutions.

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Pages: 8 p.

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Details

  • Original title: Theoretical analysis of CO2 transcritical system with parallel compression for heat recovery and air conditioning in supermarkets.
  • Record ID : 30016023
  • Languages: English
  • Source: Proceedings of the 24th IIR International Congress of Refrigeration: Yokohama, Japan, August 16-22, 2015.
  • Publication date: 2015/08/16
  • DOI: http://dx.doi.org/10.18462/iir.icr.2015.0530

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