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Essais menés sur la performance et comparaison des systèmes au CO2 à suralimentation et en cascade avec du R-404A primaire.

Performance testing and comparison of liquid overfeed and cascade CO2 systems with R-404A primary.

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

Résumé

A subcritical CO2 parallel compressor system was setup and tested, and energy efficiency comparisons were completed. R-404A was the high-side refrigerant, and heat was rejected at controlled condensing temperatures. 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. The direct expansion approach used a cascade refrigeration system with CO2 low side compressors and R4-04A high side compressors. For medium evaporating temperatures, tests were conducted only with pumped liquid overfeed, and no CO2 compressors were used. Semi-hermetic piston compressors were used for both R-404A 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 ratio conditions, the energy efficiency of the pumped liquid system was roughly equal to the R-404A baseline.

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Format PDF

Pages : ICR07-B2-123

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    20 €

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    Gratuit

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Détails

  • Titre original : Performance testing and comparison of liquid overfeed and cascade CO2 systems with R-404A primary.
  • Identifiant de la fiche : 2008-0110
  • Langues : Anglais
  • Source : ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Date d'édition : 21/08/2007

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