This fluid looks discouraging at first because of its poor theoretical performance (as shown in Figure 3.2), low critical temperature and high pressure. However, the refrigerant side heat transfer is about 35% better than with R22, whereas for R407C and R134a it is poorer. The pressure drop effect in equivalent heat exchangers is 30% less. Research has shown that systems optimized for R410A can deliver up to 5% better system COP than R22 equivalent systems, whereas R407C systems tend to be about 5% poorer. Many air-conditioning suppliers are switching to R410A, especially for direct expansion type systems where an added advantage is that smaller pipe sizes can be used.
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