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Pushing the envelope: extending the range and performance of R744.

Number: 1218

Author(s) : LOW R.

Summary

Refrigerant R-744 is finding increasing favour as a non-flammable refrigerant in a range of cold-chain refrigeration and other applications. Its properties however constrain its application: its triple point of -57°C sets a lower practical operating limit, while the very high operating pressures and reduced energy efficiency in high ambient climates limit its attraction for air-conditioning applications. Koura Global has in development a range of hybrid R-744-fluorocarbon refrigerants which are non-flammable but which offer significantly improved energy efficiency, reduced operating pressure and extended operational temperature range compared to R-744, whilst also having low Global Warming Potentials. The paper will present a suitable thermodynamic model for these fluids and share property and performance test data on two selected applications: air-conditioning with fluids having GWP below 300; and refrigeration to achieve product temperatures below -60°C.

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Pages: 8

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Details

  • Original title: Pushing the envelope: extending the range and performance of R744.
  • Record ID : 30027764
  • Languages: English
  • Source: IIR Rankine Conference 2020.
  • Publication date: 2020/07/31
  • DOI: http://dx.doi.org/10.18462/iir.rankine.2020.1218

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