Found the two Sankey diagrams on the website of the Exergy Design Joint Research Lab of Osaka University in Japan. The diagrams are for enthalpy and exergy in a Solid Oxide Fuel Cell (SOFC). Can’t fully understand what it means, but both are simple breakout Sankey diagrams that could also be presented as a pie chart.
The first one is titled “Enthalpy Sankey Diagram”:
The second one is a “Exergy Sankey Diagram”:
Anybody care to explain more?
Looking at the choice of color one could be led to believe that enthalpy is female, while exergy is male.