IIR document

Supermarket refrigeration system charge reduction using cascade systems.

Number: pap. ID106



Multiplex direct expansion (DX) refrigeration systems using hydrofluorocarbon (HFC) refrigerants, commonly employed in supermarkets, have a significant direct impact on the environment due to high refrigerant charge and the high Global Warming Potential (GWP) of the refrigerant. Thus, cascade systems and secondary loop systems using carbon dioxide (CO2) are becoming popular alternatives to the multiplex DX system due to their reduced refrigeration charge and the lower GWP of the refrigerant. In this paper, a comparative study of the CO2 cascade systems along with the baseline R404A multiplex DX system is performed. Also, a Life Cycle Climate Performance (LCCP) comparison of these systems in various cities in China is performed. In this study, it was found that by switching from a R404A multiplex DX system to a combined secondary loop/cascade system, the refrigerant charge can be reduced by 40% with a small decrease in system performance (up to 2%), resulting in an overall decrease in lifetime greenhouse gas emissions.

Available documents

Format PDF

Pages: 7 p.


  • Public price

    20 €

  • Member price*


* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).


  • Original title: Supermarket refrigeration system charge reduction using cascade systems.
  • Record ID : 30012535
  • Languages: English
  • Subject: HFCs alternatives
  • Source: 11th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2014). Proceedings. Hangzhou, China, August 31-September 2, 2014.
  • Publication date: 2014/08/02


See other articles from the proceedings (119)
See the conference proceedings