sankey diagrams. why are they called sankey diagrams? captain henry sankey (1853 – 1925) captain...
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Sankey Diagrams
Why are they called Sankey Diagrams?
Captain Henry Sankey (1853 – 1925)
Captain Matthew Henry Phineas Riall Sankey was an engineer.
In 1898 he was the first person to publish a diagram that used the width of an arrow to show the size of the energy flow.
The first ever Sankey diagram shows the energy flow in a real steam engine compared with a ‘perfect’ engine.
10 J energy in
1 J
useful
energy
out
9 J
wasted
energy
out
Sankey Diagram for a filament bulb
10 J energy in
1 J
useful
energy
out
9 J
wasted
energy
out
10 J energy in
4 J
useful
energy
out
Sankey Diagram for a filament bulb
Sankey Diagram for an energy efficient bulb
6 J
wasted
energy
out