The Mollier Diagram provides a useful way of depicting states and processes in a graphical format. This workbook for water allows you to plot points (obtained using the CoolProp Excel add-in directly) on a Mollier-Diagram found online at engineeringtoolbox.com. In theory you could use the CoolProp functions to create your own Mollier diagram from scratch, but Excel won’t allow you to plot that complicated a data set.