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Analyse théorique de système transcritique au CO2 avec compression parallèle pour la récupération de chaleur et le conditionnement d'air dans les supermarchés.

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

Numéro : pap. n. 530

Auteurs : KARAMPOUR M., SAWALHA S.

Résumé

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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Détails

  • Titre original : Theoretical analysis of CO2 transcritical system with parallel compression for heat recovery and air conditioning in supermarkets.
  • Identifiant de la fiche : 30016023
  • Langues : Anglais
  • Source : Proceedings of the 24th IIR International Congress of Refrigeration: Yokohama, Japan, August 16-22, 2015.
  • Date d'édition : 16/08/2015
  • DOI : http://dx.doi.org/10.18462/iir.icr.2015.0530

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