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R1234ze(E) R1234yf R1270 R290 R152a R32 -8.00% -6.00% -4.00% -2.00% 0.00% 2.00% 4.00% 6.00% 8.00% Figure 4.7. Relative differences (%) of SCOP compared to R410A (radiator heating) At lower condensing temperatures – involved in the floor type of heating – R410A registers a better performance. Therefore, over the heating season, the alternative refrigerants entail a bigger decrease in the overall SCOP. The larger reduction is now given by R1270, -7.75% compared to R410A. R290 also shows a drastic decrease, now equals to -6.46%. R1234ze(E) R1234yf R1270 R290 R152a R32 -10.00% -8.00% -6.00% -4.00% -2.00% 0.00% 2.00% 4.00% 6.00% 8.00% Figure 4.8. Relative differences (%) of SCOP compared to R410A (floor heating) It is important to point out that the seasonal COP is highly dependent on the climate group region (colder, average, warmer). The results presented are only valid when applied to a colder region, such as Sweden. -39-PDF Image | Next generation of refrigerants for residential heat pump systems
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