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The observations can only partly be confirmed what was found in the literature, as no equivalent studies can be found. In particular, the lower COP for the HFOs agrees with the findings of Mota et al. (2014) – though the comparison was made with an equivalent R134a system. Concerning R32, Barve et al. (2010) found a similar COP when compared to R410A equivalent system, instead of a higher one as in this work. 6.5 6 5.5 5 4.5 4 -22-20-18-16-14-12-10 -8 -6 -4 -2 0 2 4 6 8 10 12 14 Outdoor temperature [°C] R410A R32 R152a R290 R1270 R1234yf R1234ze(E) Figure 4.5. COP vs. outdoor temperature (floor heating) Concerning the floor heating, it can be observed that the COP is generally higher than in the radiator heating case. This is due to the generally lower temperature lift between heat source and sink. R32 now presents the best performance along the whole temperature range; the relative difference with R410A increases with the outdoor temperature and ranges from 5.8% to 8.3%. Up to 2 °C, R410A is also outperformed by R152a with a maximum divergence observed at -22 °C of 4.4%. It can be seen than in this case, R1234ze(E) outperforms the HCs much earlier than in the radiator case, specifically R1270 at -17 °C and R290 at -13 °C . Moreover, it also shows a higher COP than R152a from 13 °C up. Similarly, R1234yf now outperforms R1270 at 1 °C and R290 at 5 °C – both lower temperatures than in the radiator heating case. -37- COP [-]PDF Image | Next generation of refrigerants for residential heat pump systems
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