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Performance testing of CO2.

Author(s) : REES B., ROHRER C., SHAPIRO D., et al.

Type of article: Article

Summary

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.

Details

  • Original title: Performance testing of CO2.
  • Record ID : 2008-0503
  • Languages: English
  • Source: IRHACE J. - vol. 19 - n. 6
  • Publication date: 2007/11

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