Figure 5 shows the EER variety with the sub-cooling degrees both for R404A and R502 at certain condensing and
evaporating temperature. It is certain that, from the basic refrigeration principles, the EER quickly increases with the
increase of sub-cooling degree. The important information obtained from this figure is that there is almost no
difference of EER between R404A and R502 when sub-cooling degree varies. The EER of R404A is slightly higher
than that of R502 at higher sub-cooling degree but the situation is contrary at lower sub-cooling degree.