Environment Visual representation of energy flows In 1898, Irish engineer Captain Matthew Sankey created his first (and only) example of what is now known as a Sankey diagram – a graphic illustration displaying energy flows and losses using a series of arrows whose width is proportional to the importance of the flow. Preparing the data for Sankey diagrams is a very time-consuming process, but the resulting information is easy to interpret – essentially, the wider the arrow, the more energy involved. The following Sankey diagram shows the energy flows for Julius Blum GmbH: Energy footprint for the reporting period Production processes Employee mobility Internal shuttles Air travel Combustion engine fleet Electric fleet Business trips using third-party vehicles (private transport, rental cars, taxis) Crude oil CNG Electricity mix District heating PV electricity Hydropower Solar thermal Natural gas Rail travel 0.41 GWh Waste heat from pressurised air 20.4 GWh Waste heat recovery (WHR) from processes 4.5 GWh Waste heat from processes ∼ 5.4 GWh 137.7 GWh 84.1 GWh 14.4 GWh 2.52 GWh 0.79 GWh 0.98 GWh 0.16 GWh 0.2 GWh 0.06 GWh 0.8 GWh 0.3 GWh 35.9 GWh 40.9 GWh Pressurised air 6.0 GWh 19.4 GWh 16.5 GWh 12.8 GWh WHR 13.6 GWh 1.95 GWh 0.04 GWh 18.9 GWh 41
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