How do I read a pressure-enthalpy diagram for a specific refrigerant?

To read a pressure-enthalpy diagram, start by identifying the axes: pressure (log scale) on the x-axis and enthalpy on the y-axis. The diagram is divided into regions representing different states of the refrigerant, such as subcooling, evaporation, and superheating. Follow the isotherms (lines of constant temperature) to determine the refrigerant’s properties at specific temperatures and pressures. For example, you can use the diagram to determine the refrigerant’s enthalpy at a given pressure and temperature, or to identify the saturation points during evaporation and condensation.