Fluorocarbons and SF6. Global emission inventory and options for control
This study surveys current knowledge on emissions of HFCs, PFCs, FICs and SF6.
It has been estimated to what extent HFCs, PFCs, FICs and SF6 replace the demand for CFCs, halons and CH3CCl3 as would have been the case without the Montreal Protocol. The most realistic substitution rates are estimated for aerosols (9-11%), cleaning (<5%), open-foam blowing (1-2%), closed-foam blowing (40-45%), stationary refrigeration (>50%), mobile airconditioning (<75%), fire extinguishers (45-50%) and other (30%).
Emissions are presented for several scenarios.In the reference scenario, reflecting a situation without specific regulations for HFCs, PFCs, FICs and SF6, the most important applications are in 2040 stationary cooling (60%), closed foam (19%) and cleaning (8%). The most widely used halocarbon is HFC-134a (40%). The 2040 CO2-equivalent emissions of HFCs, PFCs, FICs and SF6 amount to 8 - 14% of the 1990 global CO2 emissions in the scenario without HFC policy. Restricting use to stationary cooling and closed-foam blowing, which are applications with the lowest annual loss rates, decrease halocarbon emissions by about 40 - 50% relative to the reference scenario. When only compounds with low global warming potentials are used, CO2-equivalent emissions will 90% lower than in the reference scenario.