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2.3.6 Assessment of current and future refrigerants and GWP Figure 2-1 and 2-2 shows the A1 and A2L refrigerants which have been added to ASHRAE 34 (ASHRAE 34-2016) since the 2014 RTOC Assessment Report, along with a few commonly used traditional refrigerants. The figure shows the 100 year GWP, boiling point and glide for each refrigerant. These figures illustrate the relationship between the boiling point and the flammability and GWP of new refrigerants. Note that stating that a fluid has a low boiling point is equivalent to stating that it has a high pressure, and high pressure is correlated with high capacity. There is a clear trend that a low boiling point (high pressure/capacity) is correlated with a higher GWP, and that higher flammability is correlated with lower GWP. A notable exception to this is R-744, which is non-flammable, high pressure, and has a GWP of 1. Adding R-744 to a blend lowers the GWP and the flammability, but also increases the refrigerant glide, and a too high glide can make the fluid unsuitable in many applications. The figures below give a good estimate of which levels of GWP are to be expected for various capacity/pressure levels for a given flammability class. GWP, boiling point and glide for A1 alternatives 4500 4000 3500 3000 2500 2000 1500 1000 500 0 R-507 R-404A R-410A 3,3 5,9 6,1 6,1 6,5 3,4 5,4 3,8 7,4 R-22 7,2 7,4 3,5 6,6 8,1 0,1 0,1 R-134a 4,8 0,6 0 -55 -50 -45 -40 Boiling point (mid point) -35 -30 -25 -20 -15 Figure 2-1: Refrigerants of safety class A1 proposed since 2010, with values of 100 year GWP, boiling point, and glide. The number next to each blue dot is the glide. The orange dots are selected traditional HFC and HCFC refrigerants for comparison with zero or almost zero glide. 2018 TOC Refrigeration, A/C and Heat Pumps Assessment Report 47 100y GWPPDF Image | Heat Pumps Technical Options
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