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Development of a reversible CO2 residential air-conditioning system.

Author(s) : JAKOBSEN A., SKIPLE T., NEKSÅ P., et al.

Summary

Two commercial state-of-the-art reversible R-410A single-split systems has been tested and compared in both heating and cooling mode to the results achieved with a CO2 prototype RAC split unit with an inverter driven compressor. The tests were performed in calorimetric test chambers. The seasonal heating and cooling performance was calculated based on the heating and cooling demand in Oslo and Athens climates. The results show that the CO2 baseline system is within the efficiency range of the two reference units, both for Athens and Oslo climate in cooling mode. CO2 tests were also carried out with an intercooler in cooling mode. COPs were increased by around 7%. In the heating mode, the prototype CO2 system performs better than the reference units for both climates. The CO2 system should be further improved to fully compete with the top liner R-410A systems on the market in cooling mode for very hot ambient temperatures. There are several ways to improve the performance; calculations shows that improved compressor performance will cause the CO2 system to match the best reference system. Improved heat exchangers or the introduction of a expansion recovery device such as an ejector or expander will also make the CO2 system fully compete with the top liner reference system.

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Pages: ICR07-E1-1087

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Details

  • Original title: Development of a reversible CO2 residential air-conditioning system.
  • Record ID : 2007-2768
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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