Mélange de HFC134a et de HFO1234yf: un GWP plus faible sans risque d'inflammabilité

Une étude récente publiée dans la Revue Internationale du Froid compare la performance du HFC134a, du HFO1234yf et de mélanges de ces deux frigorigènes selon 3 compositions différentes de HFC134a (5, 10 et 15%). (en anglais)
A recent study* published in the International Journal of Refrigeration (IJR) by Inha University, South Korea, compared the performance of HCF134a, HFO1234yf and HFO1234yf/HFC134a mixtures at three compositions of 5%, 10% and 15% HFC134a with a heat pump bench tester.

HFC134a has a GWP of 1430, which is much higher that the EU MAC Directive’s maximum threshold of 150 for new types of vehicles. Recently, HFO1234yf has been suggested as a possible alternative refrigerant for HFC134a in mobile air-conditioners (MACs) as its COP, capacity and discharge temperature are similar. However, its use raises flammability issues.

In case of HFO1234yf/HFC134a mixtures, flammability decreases as more HFC134a is added and at compositions of over 10% HFC134a, the mixture becomes non-flammable. The amount of charge required for an HFO1234yf/HFC13 mixture is up to 11% lower than that of HFC134a, due to a decrease in density with HFO1234yf.

When the mixture contains 10-11% HFC134a, it is both virtually non-flammable and azeotropic and has no ODP and a GWP below 150, making it an environmentally friendlier and regulatory compliant solution for various HFC134a applications with minor modifications.

* Y. Lee et al, Performance of virtually non-flammable azeotropic HFO1234yf/HFC134a mixture for HFC134a applications, IJR, vol. 36-3, May 2013

This article from the IJR can be downloaded via the IIR’s Fridoc database (free for IIR members within the framework of their quota of free downloads): www.iifiir.org or info@iifiir.org
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