I liked the below 3-in-1 Sankey diagram from the e!Sankey website. Actually three different Sankey diagrams of the a steam generation process.

The first is a quantitative (mass) view of the process where water, steam, gaseous emissions are shown in kilograms:

Using the same basic structure, the second shows the energy content within the flows. Values are in MJ. Temperature is shown as additional information with a lighter color.

And finally the temperature only Sankey diagram of the steam generation process. Here the width of the arrows shows the temperature of the steam or gas.

In the background is a transparent technical process diagram of the steam process. Thanks to Michael for providing these Sankey diagrams.

I had to stop posting for a few days because I had trouble with page hijacking. Set up WP anew with the help of a friend (thanks Chris!). To get going again after this break, here’s a misc Sankey diagram from my collection:

The upper part depicts a process diagram of a gas-powered steam boiler system. Below are the energy flows as a Sankey diagram. Values are in percent, showing the yield. Out of the input energy (100%) we have 31.5% of the energy in low presseure steam and 42% in electric energy. Don’t know where I picked this duiagram from, will have to check if I find the source of this.