Which statement correctly distinguishes zeotropic and azeotropic blends regarding service?

Which statement correctly distinguishes zeotropic and azeotropic blends regarding service?

• A. Zeotropic blends have glide; azeotropic blends act like a single component; fractionation risk occurs with leaks or partial condensation
• B. Zeotropic blends have no glide; azeotropic blends have glide
• C. Both behave identically in all conditions
• D. Azeotropic blends have glide; zeotropic blends act like a single component

Answer: (A)

During service, how a refrigerant blend changes as it boils and condenses is determined by whether it glides between phases. Zeotropic blends exhibit glide, meaning the vapor and liquid have different compositions during boiling or condensation. This difference causes the blend to fractionate if there are leaks or partial condensation, altering its composition and performance over time. Azeotropic blends, on the other hand, behave like a single pure component during phase change; the vapor and liquid share the same composition, so there is no glide and no fractionation from simple phase-change processes. This makes the blend act like a single component in service. So the best statement reflects that zeotropic blends have glide with a fractionation risk, while azeotropic blends act like a single component. The other options invert these properties or claim identical behavior, which isn’t accurate.

During service, how a refrigerant blend changes as it boils and condenses is determined by whether it glides between phases. Zeotropic blends exhibit glide, meaning the vapor and liquid have different compositions during boiling or condensation. This difference causes the blend to fractionate if there are leaks or partial condensation, altering its composition and performance over time. Azeotropic blends, on the other hand, behave like a single pure component during phase change; the vapor and liquid share the same composition, so there is no glide and no fractionation from simple phase-change processes. This makes the blend act like a single component in service. So the best statement reflects that zeotropic blends have glide with a fractionation risk, while azeotropic blends act like a single component. The other options invert these properties or claim identical behavior, which isn’t accurate.