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Performance of a transcritical CO2 refrigeration system equipped with an ejector expansion system.

Performances d'une machine frigorifique transcritique au CO2 équipée d'un détendeur à éjecteur.

Author(s) : BOUMARAF L., HABERSCHILL P., LALLEMAND A.

Type of article: Article

Summary

A transcritical CO2 refrigeration cycle using an ejector instead of a throttling valve to recover some of the kinetic energy of the expansion process is presented. A constant-area mixing model at critical mode of the ejector is established to perform the thermodynamic analysis of the ejector expansion transcritical CO2 cycle. For different compression ratios of the ejector, its geometric characteristics, entrainment ratio and the coefficient of performance of the refrigerating system are determined. Furthermore, for a set compression ratio of the ejector, the effects of the compressor discharge pressure and the evaporator superheat on the system performance are discussed. The comparison with a basic transcritical CO2 cycle shows an important improvement of the COP system.

Details

  • Original title: Performances d'une machine frigorifique transcritique au CO2 équipée d'un détendeur à éjecteur.
  • Record ID : 2010-0780
  • Languages: French
  • Source: Revue générale du Froid & du Conditionnement d'air - vol. 99 - n. 1097
  • Publication date: 2009/10

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