Which of the following best describes a Zeotropic refrigerant?

A Zeotropic refrigerant is characterized by having a temperature glide during phase changes. This means that when a zeotropic refrigerant evaporates or condenses, the temperature does not remain constant; instead, it varies over a range as the refrigerant undergoes phase changes. This property is significant because it affects the efficiency and performance of refrigeration systems that use zeotropic blends.

In practical applications, the temperature glide allows for more precise control over system temperatures, which can lead to improved comfort and efficiency. However, it also necessitates careful consideration in system design and operation, particularly regarding the timing of component actions in response to the variable temperatures.

The other options do not accurately define a zeotropic refrigerant. For example, the notion of having a constant temperature during phase changes describes an azeotropic refrigerant instead, while the requirement of special handling procedures can apply to various refrigerants but isn't a defining characteristic of zeotropic types. Therefore, understanding that zeotropic refrigerants involve temperature glide helps to clarify their behavior and application in refrigeration systems.