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retrofitting is thus necessary. With the considerations above, a shortlist of eight refrigerants is elaborated and is illustrated in Figure 2.6. Their main characteristics can be seen in Table 2.1. Figure 2.6. Selected alternatives to R410A Table 2.1. Characteristics of the alternative refrigerants to R410A Refrigerant GWP* R410A 2088 R513A 631 R450A 601 R1234yf 4 R1234ze(E) 7 R32 675 R152a 124 R290 3 R1270 2 Flammability T critical [°C] 72.8 101.1 105.7 94.7 109.4 78.1 113.3 96.7 91.1 P critical [bar] 48.6 36.8 40.8 33.8 36.3 57.8 45.2 42.5 45.6 Nat. boiling point [°C] -48.5 -29 -24 −29.5 -19 - 52 -25 - 42.2 -47.6 A1 A1 A1 A2L A2L A2L A2 A3 A3 -19-PDF Image | Next generation of refrigerants for residential heat pump systems
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