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2 Those with zero ozone depleting potential There are three other sub-categories of synthetic refrigerants that have zero ODP and play a part in RAC: Perfluorocarbons They represent another group of fluorocarbons which contains five different fluids. One of these (R218) is occasionally used in refrigerant blends. Generally PFCs are very stable, but as a result have very high GWP. Unsaturated HFCs Whilst conventional HFCs are saturated, there are a small number of unsaturated HFCs, known as olefins. Generally, there are highly unstable, but recently a small number have been identified which are sufficiently stable to be used as refrigerants, and have low- toxicity and low flammability and low GWP. The two receiving most interest are R1234yf and R1234ze; the former is being considered for use in MVAC systems, but it is unlikely that they will be applied as refrigerant in other sectors for several years. Hydrofluoroethers This group of fluorinated chemicals tends to be fairly stable and amongst them have a fairly wide range of boiling points, although they tend to be lower pressure fluids. They have been considered as use as refrigerants, but to date have not achieved market acceptance for various reasons. Those with ozone depleting potential 4 Heat transfer fluids 4 Using Refrigerant Blends – issues and concepts 4 43 RefrigerantsPDF Image | Manual for Refrigeration Servicing Technicians
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