The log p-h diagram is related to other thermodynamic diagrams, such as the T-s diagram, in that they all provide visual representations of the thermodynamic state changes of a system. While the log p-h diagram plots pressure against enthalpy, the T-s diagram plots temperature against entropy. Both diagrams can be used to analyze the refrigeration cycle, but the log p-h diagram is particularly useful for refrigeration systems due to its ability to show the relationships between pressure, temperature, and enthalpy.