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Experiences with CO2 supermarkets in New Zealand.

Author(s) : BERGE J., REES B., SHAPIRO D.

Summary

CO2 secondary systems were determined to be a good choice for supermarket refrigeration in New Zealand and Australia with emphasis on energy efficiency and reduced carbon footprint. Through March 2008, three sites have been successfully installed in New Zealand and one in Australia, and additional sites are planned. Compared to similar R404A direct expansion systems, overall warming effect was reduced 29%, R404A charge was reduced 74%, and energy use was reduced approximately 5% on average. Due to very high volumetric capacity of CO2, care should be taken not to turn on all cooling loads at once. Timers were used to ensure loads would be staged on after, for example, an unplanned shutdown. To ensure adequate temperature control, individual display cabinet control is recommended. CO2 secondary systems were determined to be a good choice for supermarket refrigeration in New Zealand and Australia with emphasis on energy efficiency and reduced carbon footprint. Through March 2008, three sites have been successfully installed in New Zealand and one in Australia, and additional sites are planned. Compared to similar R404A direct expansion systems, overall warming effect was reduced 29%, R404A charge was reduced 74%, and energy use was reduced approximately 5% on average. Due to very high volumetric capacity of CO2, care should be taken not to turn on all cooling loads at once. Timers were used to ensure loads would be staged on after, for example, an unplanned shutdown. To ensure adequate temperature control, individual display cabinet control is recommended.

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Details

  • Original title: Experiences with CO2 supermarkets in New Zealand.
  • Record ID : 2010-1929
  • Languages: English
  • Subject: HFCs alternatives
  • Source: 2008 Purdue Conferences. 19th International Compressor Engineering Conference at Purdue & 12th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2008/07/14

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