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2 Refrigerant blends Although refrigerants can be one single substance, they can also be a mixture of two or more substances, and these are normally referred to as “blends”. Refrigerant blends have been formulated to provide a match to certain properties and characteristics of the refrigerants originally used (i.e. in the case of retrofit blends), or to achieve a particular set of properties for other reasons. Most commercially available blends have between two and five components. These components may be HCFCs, HFCs and/or HCs and PFCs. The individual component refrigerants in a blended refrigerant do not have identical physical characteristics; they have different densities, different viscosities and different evaporation and condensation temperatures at a given pressure. With most blends, the components within the mixture change their composition in the liquid and vapour phases as the blend boils or condenses; these are known as zeotropes. These have an R-number designation, R4xx. Less commonly, the individual components in certain blends interact such that the vapour phase and liquid phase have the same composition at a given pressure; these blends are called azeotropic mixtures. These have an R-number designation, R5xx. There are two types of blend: Azeotropic 4 Zeotropic 4 46 RefrigerantsPDF Image | Manual for Refrigeration Servicing Technicians
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