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2 Using Refrigerant Blends – issues and concepts The following graphic allows you to consider different concepts and issues range of temperature. Similarly, if a zeotropic refrigerant was left to boil off within a bucket, the temperature at which it would start to boil would be the bubble-point temperature, and eventually the last few drops would be boiling off at the dew-point temperature. However boiling and condensation in “flooded” type evaporators and condensers will not normally exhibit any temperature glide because they are constantly being replenished with new refrigerant. Thus the refrigerant is seen to change phase at a single temperature - the bubble-point in an evaporator and dew-point in a condenser. Composition The specific characteristic of zeotropic blends, i.e., the liquid and vapour composition, is different at most given temperature and pressure. This causes concerns relating to composition changes in the refrigerant supply chain, including liquid removal from containers for multi-component refrigerant mixtures in the manufacturer plant, and refrigerant transfers to smaller containers by dealers. A study conducted by the Air Conditioning and Refrigeration Institute (ARI) in USA indicates “refrigerant mixtures can have composition changes during the handling procedures that lead to out-of-specification composition”. The refrigerant transfer and equipment charging by technicians, and refrigerant equipment leakage could also change the composition. The change of the composition will affect the performance to some extent. Accordingly, ARI and Deutsches Institute für Normung (DIN) sets composition tolerances for specific blends, for example, ARI composition tolerances for R410A (R32/R125) are +0.5, -1.5% for R32, and +1.5, -0.5% for R125. relating to the use of refrigerant blends. Temperature glide 4 Composition 4 Flammability 4 When considering these factors combined there are pros and cons for blends. Pros and cons for blends 4 Temperature glide The characteristic called “temperature glide” refers to the temperature range over which components in a blended refrigerant boil or condense at a given pressure. A pure substance (like water) at a constant pressure will go through a complete phase change at a constant temperature. Conversely, a zeotropic blended refrigerant must proceed through a temperature range in order to complete the phase change process. The name temperature glide refers to this 49 RefrigerantsPDF Image | Manual for Refrigeration Servicing Technicians
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