Describe the difference between an azeotropic refrigerant blend and a near-azeotropic or zeotropic refrigerant blend?

An azeotropic refrigerant blend has a constant boiling point and composition throughout the phase change, behaving like a single substance during evaporation and condensation. In contrast, near-azeotropic or zeotropic refrigerant blends exhibit varying compositions and boiling points, leading to temperature glide during phase change, where the refrigerant does not boil or condense at a single temperature. This difference affects system efficiency and performance, with azeotropic blends generally providing more consistent thermal properties, while zeotropic blends may offer better energy efficiency and lower environmental impact.