Although regulation efforts are focused on the GWP metric due to the simplicity of relating to the direct emission impact of the refrigerant, it is actually more important to recognize the indirect emission from the efficiency impact of the refrigerant which can be more overwhelming than its direct emission, particularly for applications such as stationary A/C where the direct emission is typically no more than 5% of the total emission.
As illustrated in Figure 2, the concept of using Life Cycle Climate Performance (LCCP) has been widely recognized globally as a better metric for weighing both the direct and indirect effects. This paper will review further the merit of R32 versus other candidates in the context of both GWP and LCCP, ability to reduce charge and to sustain efficiency and affordability