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4.6.1. R32 Overall, at the evaluated conditions R32 offers a better performance than R410A in terms of COP, at every outdoor temperature. Moreover, the VHC is higher, thus entailing a possible smaller size of compressor. On the other hand, the TEWI factor is subjected to the lowest reduction (when assuming a constant volumetric charge). Furthermore, at certain conditions the discharge temperature can reach level above the safety threshold set for the protection of the compressor. These outcome can be observed in Figure 4.18. Flammability issues must also be kept into account, as R32 belongs to the A2L category. The system could then be required to comply with restrictions in terms of amount of charge and location of the heat pump. It has to be noticed that for the particular characteristics of this category, the limitations could be reduced in the future – differently than the 2 class TEWI SCOP Discharge temperature 30% 20% 10% 0% -10% -20% -30% -40% -50% COP VHC Figure 4.18. Summary of evaluated parameters for R32 4.6.2. R152a The use of R152a results in an increase of the SCOP, when considering radiator heating applications, and a decrease in the TEWI bigger than in the case of R32. At the very low temperatures the discharge temperature is reduced compared to R410A, and the COP is increased, as seen in Figure 4.19. At the highest temperatures, instead, the refrigerant at the exit of the compressor reaches higher temperatures than R410A, though remaining below the safety limit. The COP worsen. Furthermore, the VHC is lower, thus implying the necessity of using more charge to obtain the same heating effect. R152a is also flammable, thus requiring restrictions as in the previous case. -47-PDF Image | Next generation of refrigerants for residential heat pump systems
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