The selection of the fluid alternatives is driven by the
following strength factors:
_ their compatibility to the existing plant features and major
components;
_ their non-flammability and non-explosibility;
_ their non-toxicity;
_ their high market availability and acceptable cost respect to the current commercial and experimental fluids (Fig. 3);
_ their GWP reduction respect to R404a (benchmark), i.e._46.8% for R410a and _53.5% for R407f;
_ their match with the forthcoming EU restrictions for the new (until 2022) and existing plants.