R-469A

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R-469A is the name for a refrigerant mixture . It consists of 35% carbon dioxide (R-744), 32.5% difluoromethane (R-32) and 32.5% pentafluoroethane (R-125).

history

The mixture was developed by the TU Dresden and Weiss Technik (a company of the Schunk Group ). The starting point for the development was the restriction of the use of the refrigerant fluoroform (R-23) by the EU regulation 517/2014 on fluorinated greenhouse gases. At that time, R-23 was the most frequently used refrigerant to reach temperatures down to −70 ° C. Since 2014, the marketing of R-23 in new refrigeration installations and devices has only been permitted within the framework of transitional regulations. Among other things, these led to a significant shortage of the available quantity and to an enormous increase in prices.

The aim of the project was to develop a new refrigerant for temperatures down to −70 ° C, which meets the requirements of the EU regulation and is non-flammable or toxic. In 2019, the mixture was registered with ASHRAE for the issue of an R number, which was assigned in the same year.

properties

properties value
composition

35% R-744 (CO 2 )
32.5% R-32 (CH 2 F 2 )
32.5% R-125 (C 2 HF 5 )

average molar mass [g / mol] 59.1
Bubble Point [° C] −78.5
Dew point [° C] −61.5

R-469A is a chemically stable, colorless and odorless gas mixture. Because it is non-toxic and non-flammable, it has been classified in safety group A1. The global warming potential (GWP) of R-469A is 1357, which is less than 10% of that of R-23 (GWP 14,800). Due to the low GWP value, it meets the requirements of EU regulation 517/2014 on refrigerants for new systems even without the otherwise necessary exemption. Systems with the refrigerant R-469A are exempt from the leak test in accordance with EU regulation 517/2014 up to 3.6 kg fill quantity .

use

R-469A is used in test chambers for climate simulation that reach temperatures as low as −70 ° C. It serves as a replacement for R-23. The properties of R-469A in terms of cooling rate, heat compensation or air distribution are almost identical to those of R-23. This allows the test results of systems with both refrigerants to be directly compared.

Trade names

  • WT69

Individual evidence

  1. ↑ New refrigerant without R23. In: Plastverarbeiter.de. July 1, 2019, accessed on December 19, 2019 (German).
  2. ↑ a b Regulation (EU) No. 517/2014 of the European Parliament and of the Council of April 16, 2014 on fluorinated greenhouse gases and repealing Regulation (EC) No. 842/2006 . May 20, 2014 ( europa.eu [accessed December 19, 2019]).
  3. ↑ BOC: Guide to updated EU f-gas regulation (517/2014) . Ed .: BOC. September 1, 2014, p. 8 .
  4. ^ Publication of the approval by ASHRAE. Retrieved December 19, 2019 .
  5. ↑ ashrae.org: ANSI / ASHRAE Addendum to ANSI / ASHRAE Standard 34-2019 , accessed January 1, 2020.
  6. ↑ Data sheet for WT69 from Weiss Technik. Retrieved December 19, 2019 .
  7. ↑ Climate tests without leak testing. Retrieved December 19, 2019 .
  8. ↑ New WT69 refrigerant for cryogenic applications. Retrieved December 19, 2019 .