In addition to already investigated blends in the search for a lower GWP alternative to R-410A (GWP = 2,088) in air conditioning systems, such as blends of around 72 % HFC-32 and 28 % of HFO-1234yf or HFO-1234zeE, another blend has now been proposed, composed of HFC-32/HFC-125/HFO-1234yf (67 / 7 / 26 % weight), with a GWP of 698 (using the F-Gas Regulation GWP rules).
The blend is said to deliver improved energy efficiency and excellent performance at high ambient temperatures. It is mildly flammable (A2L classification) but shows a slower burning velocity and higher minimum ignition energy requirement when compared to R32.
It is expected that further AHRI research will help industry to understand the comparative risk of using A2L refrigerants with those used today.
Source : Cooling post