What is temperature glide?

• A. The difference between the bubble and dew point
• B. The temperature at which the first refrigerant in a blend turns to vapor
• C. The temperature at which all components boil at the same rate
• D. The temperature range over which a refrigerant remains liquid

Answer: (A)

Temperature glide is the difference between the bubble point temperature and the dew point temperature for a zeotropic refrigerant blend at a given pressure. Because the components in the blend boil at different temperatures, the vapor has a different composition than the liquid during phase change, so boiling occurs over a range of temperatures rather than at a single point. A pure refrigerant has no glide because its bubble and dew points coincide. The other descriptions don’t capture this idea of a temperature range caused by differing component boiling points.