R454A / R513A - Next generation solutions for commercial refrigeration
Traditional HFC refrigerants often have high GWPs. European regulations and international treaties force the replacement of these high GWP gases in refrigeration and air conditioning (RAC) applications. Direct GHG emissions from RAC systems are due to the refrigerant leaks during operation, first fill, continuous service, and end of life recovery; and are linked with the GWP of the refrigerant. The GWP of the refrigerant itself is linked with the amount of fluorination, and the stability, of the base molecule. In simplified terms, the fluorine molecule is used to reduce of the flammability of the underlying hydrocarbon on which the refrigerant gas is based. Since pure hydrocarbons have a flammability too extreme for certain applications, compromises have to be found which allow a safe and efficient operation of these systems with lowest possible GWP of the refrigerant. This presentation describes replacements for refrigerants R-134a and R-404A in their typical applications based on novel mixtures of R-134a / R-1234yf and R-32 / R-1234yf respectively. Both mixtures are described in detail via their thermo-physical properties and their safety / environmental characteristics. Comparisons, how R-454A and R-513B perform vs. competing products under capacity, efficiency and applicability under safety aspects are reported in the second part of the presentation. These findings are based on simulation as well as on lab- and field tests, where these new refrigerant blends were compared to other common solutions. R-513B has comparable safety characteristics to R134a, both having an A1 classification. This is not the case for R454A which has a slightly increased flammability in comparison to R404A. How both refrigerant blends can be safely applied in new or existing systems under relevant standards, such as EN378 or ISO 5149, will be reported at the end of the presentation.
--- Datum: 17.10.2018 Uhrzeit: 15:00 - 15:20 Uhr Ort: Halle 7A, Stand 7A-618