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Essais sur la performance du CO2.

Performance testing of CO2.

Auteurs : REES B., ROHRER C., SHAPIRO D., et al.

Type d'article : Article

Résumé

A sub-critical CO2 parallel compressor system was set up and tested, and energy efficiency comparisons were completed. R-404A was the high-side refrigerant, and heat was rejected at a controlled condensing temperature. CO2 was the low-side secondary refrigerant and heat was added from a glycol-heated evaporator. For low evaporating temperatures, tests were conducted with 1) pumped liquid CO2 in a liquid overfeed system and 2) direct expansion of CO2. Semi-hermetic piston compressors were used for both R404A high side and cascade CO2 low side. Performance comparisons were made between these two types of CO2 systems and baseline direct expansion R-404A. At high temperature ratio conditions, the cascade CO2 system was roughly 5% more efficient than either the baseline R-404A direct expansion system or pumped liquid CO2 system. At low temperature ration conditions, the energy efficiency of the pumped liquid system was roughly equal to the R-404A baseline.

Détails

  • Titre original : Performance testing of CO2.
  • Identifiant de la fiche : 2008-0503
  • Langues : Anglais
  • Source : IRHACE J. - vol. 19 - n. 6
  • Date d'édition : 11/2007

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