As mentioned in the introduction section, several blends of HFO-1234yf and HFO-1234ze are also Low-GWP candidates as the R1234yf or R1234ze component of these blends has ultra low GWP of 4 and 6 respectively.
Previous literature [3] has reported that pure R1234yf or R1234ze is targeted as an R134a alternative, thus not
efficient as an R410A alternative from a system performance standpoint without substantial redesign with larger
compressor, piping and heat exchangers and added cost to compensate for the high pressure drop.
Blending R1234yf or R1234ze with HFCs like R32 offers new alternatives as reported in recent literature [5,6].
However, a main concern with these HFOs is that they are considerably more expensive than R410A [10] and their long-term cost position is yet to be defined.. These HFO blends are still proprietary in development stage and their properties
are not yet publicly available.