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Residential air conditioning with CO2: preliminary results.

Author(s) : AARLIEN R., PETTERSEN J., SKAUGEN G., NEKSA P.

Summary

The purpose of the study was to evaluate the potential for use of CO2 in residential split or single-packaged air-conditioning systems, as a replacement technology for HCFC-22. Results from preliminary calculations for a reversible split system of 7 kilowatts cooling capacity indicates that both the seasonal COP or energy efficiency ratio (cooling) and the seasonal performance factor (heating) would be competitive to those of HCFC-22 systems, assuming a standard North-American climate. The calculated cooling COP with CO2 is lower than with HCFC-22 at extreme ambient temperatures, but since most of the operating hours are at moderate temperatures, the seasonal performance would be somewhat better with CO2 than with HCFC-22. In heat pump operation, the CO2 system supplies a larger share of the building heat requirement than the HCFC-22 system, and less supplementary heat is needed. As a result, the heating performance factor (including supplementary heat) will be higher. A TEWI reduction of about 10% compared to HCFC-22 or HFC blend systems can be obtained. Owing to the gliding heat rejection temperature for the CO2 system, higher air delivery temperatures are possible, and hot water production can be easily integrated.

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Details

  • Original title: Residential air conditioning with CO2: preliminary results.
  • Record ID : 1997-2392
  • Languages: English
  • Source: Applications for Natural Refrigerants
  • Publication date: 1996/09/03
  • Document available for consultation in the library of the IIR headquarters only.

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