🔍 Key Concepts

• Relationship between saturation pressure and saturation temperature shown by the dome on a pressure-enthalpy diagram • How conditions change when refrigerant is in the subcooled liquid region vs the superheated vapor region vs the saturated mixture region • Meaning of a constant temperature line on the right side of the diagram and where it applies

💭 Think About

• On the diagram, at a fixed pressure line that passes through the saturated dome, what does the temperature do as you move from saturated liquid, through the mixture, and into superheat? • In which region(s) does a single pressure correspond to more than one possible temperature for the refrigerant? • Look closely at the labels: where does the diagram actually show a clear, fixed temperature corresponding to each pressure?

✅ Before You Answer

• Identify where the saturated liquid line and saturated vapor line are and what they mean physically • Check whether the subcooled region or the superheated region has a 1:1 relationship between pressure and temperature at a given point • Verify if the constant temperature line shown applies across all regions at that pressure, or only in a particular condition of the refrigerant