Alternatives to HCFCs in the Refrigeration and Air Conditioning Sector 73 app endix I High-GWGWP refrfrigerarants – Synthetic refrfrigerarants CFC, HCFC and HFC used as HCFC alternatives Numbering based on standard ISO 817:2003 also ASHRAE Standard 34, the lists are not complete but aim to reflect those that are commonly used or discussed as replacements in the RAC sector. Below the list is separated between products with and without glide as this is an important factor in evaluation of what product to use and if any consideration to glide is required. Glide means that the boiling point of the different components will be noticeable during condensing and evaporation. These refrigerant has a R-4xx number. Mixtures that behave like one substance without glide are called azeotropic blends and will be listed as R-5xx refrigerants. L ow-GWGWP synthetic refrigerants Refrigerarant number L ow-GWGWP replacements to R-134a proposed by DuPont/Honeywell for Mobile air conditioning where EU has a future ban. Currently not commercially-available/tested in stationary RAC systems but could possibly be a future alternative G roup Chemical name Chemical formula ODP GWGW P G roup ISO 817 HFO-1234yf HFO 2,3,3,3-tetrafluoropropene CF3CF=CH2 0 4 A2L (slightly flammable) Several other HFOs are under evaluation and there are also evaluated mixtures with HFO1234yf to achieve better match with existing products. Refrigerarant number Gr oup Ch emical name Ch emical formula N ormal boiling pointa °C OD P GWGW P (100 Year) IPCCCC 2001 R -22 HCFC chlorodifluoromethane CHClF2 −41 0.055 1700 R -124 HCFC 2-chloro-1,1,1,2-tetrafluoroethane CHClFCF3 −12 0.022 620 R -32* HFC Dichlorodifluoromethane (methylene fluoride) CH2F2 0 550 R -125 HFC pentafluoroethane CHF2CF3 −49 0 3400 R -134a HFC 1,1,1,2-tetrafluoroethane CH2FCF3 −26 0 1300 R -141b HCFC 1,1-dichloro-1-fluoroethane CH3CCl2F 32 0.11 700 R -142b HCFC 1-chloro-1,1-difluoroethane CH3CClF2 −10 0.065 2400 R -143a HFC 1,1,1-trifluoroethane CH3CF3 −47 0 4300 R -152a* HFC 1,1-difluoroethane CH3CHF2 −25 0 120 R -507A HFC R -125/143a (50%/50%) 0 3850 * Classified as A2/A2 = slightly flammable Pure substances and non-azeotropic blends (e.g. blends without a temperarature “glide”) Red indicate ODS that will be phased out. green indicate alternatives with neglectable environmental impact (can be flammable or toxic). b lue indicates substances with zero ODP that are most common alternatives in the RAC sector today. yellow are the so called service blends intended for use in existing systems with no or partial oil change. Wh ite are non-ODS which are mainly used as a components in blends or blends that have limited market presence at this time.