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Evaluation of carbon dioxide as R22 substitute for residential air conditioning.

Author(s) : BROWN J. S., KIM Y., DOMANSKI P. A.

Summary

The R22 system had a significantly better coefficient of performance (COP) than the CO2 system when equivalent heat exchangers were used in the CO2 and R22 systems, which indicates that the better transport properties and compressor isentropic efficiency of CO2 did not compensate for the thermodynamic disadvantage of the transcritical cycle in comfort cooling applications. An entropy generation analysis showed that the CO2 evaporator operated with fewer irreversibilities than did the R22 evaporator. However, the CO2 gas cooler and expansion device generated more entropy than their R22 counterparts and were mainly responsible for the low COP of the CO2 system.

Details

  • Original title: Evaluation of carbon dioxide as R22 substitute for residential air conditioning.
  • Record ID : 2004-0358
  • Languages: English
  • Source: ASHRAE Transactions. 2002 annual Meeting, Honolulu, Hawaii. Volume 108, part 2 + CD-ROM.
  • Publication date: 2002

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