Which refrigerant is classified as a zeotropic refrigerant?

R410A is classified as a zeotropic refrigerant because it consists of a blend of two refrigerants (R32 and R125) that have differing boiling points. Zeotropic refrigerants don't evaporate and condense at a single temperature; instead, they have a temperature glide during phase changes. This characteristic means they can offer better efficiency and heat transfer performance in some applications, but it also requires careful handling during charging and servicing to maintain the correct proportions of each component in the mixture.

In contrast, refrigerants that are classified as azeotropic behave as a single substance during phase changes. While R134A, R404A, and R290 each have their own specific applications and characteristics, they do not exhibit the same zeotropic behavior as R410A. For instance, R290 is a natural refrigerant (propane) and has a different classification due to its pure chemical composition, meaning it does not have a temperature glide associated with phase change like zeotropic refrigerants do.