What is a key feature of Near-Azeotropic refrigerants?

A key feature of near-azeotropic refrigerants is that they can fractionate under certain conditions. This characteristic arises from the slight variations in the composition of the refrigerant blend, which leads to different boiling points for its components. As the refrigerant evaporates or condenses, the proportions of the individual refrigerants can change, resulting in separation or ‘fractionation’ of these components.

In practical applications, if a near-azeotropic refrigerant is allowed to leak or if it undergoes significant changes while in operation, it might not maintain its original composition, which can affect its performance and efficiency. Understanding this property is crucial for technicians and engineers when designing systems that operate with these types of refrigerants, as it necessitates careful handling and monitoring.

The other options highlight features that do not correctly apply to near-azeotropic refrigerants. For instance, the presence of some temperature glide is characteristic of near-azeotropic blends and is a consideration in their application. While near-azeotropic refrigerants can function effectively at higher pressures, this is not a defining feature exclusive to them. Additionally, while handling practices are important with all refrigerants, near-azeotropic blends often do require specific handling techniques to prevent fractionation during service.