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New refrigerant developments for very low temperature refrigeration.

Number: 1138

Author(s) : LOW R., SEETON C.


Very Low Temperature cascade refrigeration is of increasing importance in ensuring a suitable cold chain for high value materials such as vaccines or premium seafood. Koura is developing new refrigerant options for system designers including R-473A. This refrigerant was designed as a non-flammable "near drop-in" alternative to R-23 or R-508B, with Global Warming Potential (GWP) below 2000. It contains 60% of R-744 but can operate well below that refrigerant's triple point. This paper presents information on R-473A in use including: performance testing, oil and materials compatibility studies and analysis of its effective temperature range. Options will be discussed for further reduction in GWP to enable non-flammable refrigerants or weakly flammable refrigerants capable of operating at -90°C evaporator conditions.

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Pages: 7 p.


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  • Original title: New refrigerant developments for very low temperature refrigeration.
  • Record ID : 30029501
  • Languages: English
  • Subject: HFCs alternatives
  • Source: 7th IIR International Conference on Sustainability and the Cold Chain Online. Proceedings: April 11-13 2022
  • Publication date: 2022/04/11
  • DOI:
  • Document available for consultation in the library of the IIR headquarters only.


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