IIR document

Replacements for R410A with GWPs less than 300.

Number: pap. n. 144

Author(s) : SCHULTZ K.


The recent Kigali amendment to the Montreal Protocol will necessitate the phase-out of R410A used in air conditioning systems in developed countries by the late 2020s. This will require the industry to begin using R410A replacements by the middle 2020s. Analyses indicate that the weighted average GWP will need to be 300 or less to reach the overall Kigali targets. The large volume of R410A used in HVAC applications makes this difficult to achieve if the GWPs of its replacements are allowed to be 675 to 750, based on R32 as a benchmark. Three recently introduced molecules offer opportunities to formulate blends with GWPs well less than 675, even achieving GWPs <300. This paper investigates the thermodynamic properties of blends using these new molecules and identifies several specific blend compositions that could serve as lower GWP replacements for R410A. Compromises between important factors are considered, including capacity (match to R410A), efficiency, temperature glide, compressor discharge temperatures, and operating pressures. Beyond their thermodynamic properties, these new molecules present challenges in chemical stability and materials compatibility that are beyond the scope of this paper.

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  • Original title: Replacements for R410A with GWPs less than 300.
  • Record ID : 30025958
  • Languages: English
  • Subject: General information
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.0144


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