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Sankey Diagrams – A Sankey diagram says more than 1000 pie charts
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SANKEY DIAGRAMS
A Sankey diagram says more than 1000 pie charts
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SANKEYS WITH CIRCULAR LINKS
__phineas __October
28, 2020October 28, 2020
__1
Comment on Sankeys with circular links
Guus, a reader of this blog, DMed me to ask whether I “knew of any
(open source) JavaScript libraries that can generate circular Sankey
diagrams”?
Many of the Sankey diagrams I see on the web are created using d3.js
by Mike Bostock
. Typically these diagrams are
left-to right oriented and have a column structure. What is less
common are feedback loops or circular Sankey arrows, like the pink
ones in the figure below.
The place to look for is Tom Shanley’s Block
.
Here you can find many samples for:
* Sankey with circular links (2017)
* Sankey with circular links, with arrows to indicate direction
* Sankey with circular links (updated version 2020)
* Sankey with circular links combined with animated flows, another
way of indicating direction
Guus, I hope you can find what you are after there. Enjoy!
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Samples
SANKEY DIAGRAM FOR AIR COMPRESSOR
__phineas __October
23, 2020October 23, 2020
__Leave
a comment on Sankey Diagram for Air Compressor
A comment from a reader pointed me to this Sankey diagram for energy
flows in an air compressor system. It can be found as a sample on the
web page of VHK Research Engineers
. VHK uses Sankey
diagrams to “get the message across”.
_(Image copyright: European Union, author: VHK)_
This is a rare example of a top-down oriented Sankey diagram. There
are no absolute numbers, rather we see the 100% energy being turned
into useful work, and off-heat, which could potentially be recovered.
Nice piece of art, and I invite Rene to comment on this…
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Samples
ENERGY CONSUMPTION LOGISTICS CENTER
__phineas __October 9,
2020
__Leave
a comment on Energy Consumption Logistics Center
Here is another Sankey diagram out of Germany. Found this in a 2017
doctoral thesis titled ‘Wechselwirkungen und Auswirkungen von
Planungsalternativen auf die Gesamtenergiebilanz und die
CO2-Emissionen von Logistikzentren’ by Julia Freis, Lehrstuhl für
Fördertechnik Materialfluss Logistik, Technical University Munich
(TUM).
From what I understand using Google Translate this seems to be one of
the energy scenarios (maintaining a 17°C temperature) for a logistics
hub. Flows are in kWh per year.
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Samples
CHINA CARBON EMISSIONS FROM ENERGY
__phineas __October 2,
2020October 23, 2020
__Leave
a comment on China Carbon Emissions from Energy
Energy generation in China is dominated by the use of hard coal. This
Sankey diagram is from an article titled ‘A Method for Analyzing
Energy-Related Carbon Emissions and the Structural Changes: A Case
Study of China from 2005 to 2015’ by Honghua Yang, Linwei Ma and
Zheng Li (Tsinghua University) in: Energies 2020, 13, 2076;
doi:10.3390/en13082076 .
It shows carbon flow and emissions (I take that as CO2 only, although
it might include CH4 if biogas was used)
Published under the terms and conditions of the Creative Commons
Attribution(CC BY 4.0) license
Depicted are energy-related carbon flows in China in 2015. Unit of
flow is 10 Mt C, which in the last column also translates into Mt CO2.
The sectors Transport (“Vehicle”), Industry (“Factory”) and
Buildings are further broken down into the individual services the
energy provides, like illumination, thermal comfort, hygiene.
There is another energy flow diagram for China in 2015 in this article
, and it shows that
there are also other energy sources (hydro, wind, nuclear, solar), but
these don’t show up in the carbon flow diagram.
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Samples
GLOBAL ENERGY FLOWS 2018/2050, DNVGL
__phineas __September
18, 2020
__Leave
a comment on Global Energy Flows 2018/2050, DNVGL
Fresh off the press last week is DNVGL’s Energy Transition Outlook
2020 . This report is a
“forecast of the world’s most likely energy future through to
2050” and in my opinion this is really good information. The new
edition already factors in the effects of the pandemic.
The spread on pages 122/123 has the following Sankey diagrams, a
comparison of the global energy landscape in 2018 and the forecast for
2050:
The individual flows are not labeled with quantities, but we get an
idea from the blue stream, that represents 27 PWh/yr electricity in
2018 and 60 PWh/yr in 2050. “One striking change on the supply side
of the picture is the emergence of solar PV and wind at the expense of
coal and oil. Electrification more than doubles through to 2050, which
leads to an increase in the overall system efficiency.”
Make sure to download your copy of the DNVGL Energy Transition Outlook
2020 , to study the global
energy flow Sankey diagram in more detail.
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Samples
MATERIAL FLOW ANALYSIS FOR ALMATY
__phineas __September
9, 2020
__Leave
a comment on Material Flow Analysis for Almaty
Almaty is the largest city in
Kazakhstan. It is also the first city in Central Asia that did a
circular economy opportunities analysis. Numerous ideas were proposed
during a project with local stakeholders.
The project is described on the Shifting Paradigms blog
, and the full
report ‘Metabolic analysis and circular economy strategies for
Almaty, Kazakhstan’ describing the project can be downloaded there.
Visuals turned out to be crucial
in this
project for communicating information and to be able to oversee the
amount of data. “Mapping out the metabolic system of a city, helps
understand how a city uses material resources to deliver valuable
services to its inhabitants, like nutrition, shelter and mobility, and
identify opportunities for improvement.”
This is the Sankey diagram depicting the material flows for Almaty,
Kazakhstan covering minerals, metals, biomass, fossil fuels, energy
and water used in Almaty’s industry. It is shown on pages 36/37 of
the report. Flows are in kT (per one year ?) with imports/exports
across the city’s boundaries.
Blended into this material flow analysis (MFA) diagram are greenhouse
gas emissions (GHGs). “The red flows at the lower section of the
graph show the embedded gas emissions in imported goods and
materials.” These could be considered hidden quantities associated
with the production of products or the import of fuels,
“piggybacking” on the actual physical material flows that enter
and leave the industrial sector in the city.
Note that it seems as if flows are not always to scale or parts are
hidden behind other flows (see, for example, the yellow stream
representing 968 kT of fuel being turned into 2,975 kT GHGs, a flow
that is not three times as wide). Also the recycling flow width seems
to overblown, probably to point out that recycled materials can loop
back through the system multiple times, and to focus the circular
economy perspective.
There are two other Sankey diagrams in the report, so make sure you
have a look at it
.
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Samples
FRANCE’S GRAND EST REGION ENERGY FLOWS
__phineas __September
4, 2020September 4, 2020
__Leave
a comment on France’s Grand Est Region Energy Flows
Le Grand Est is a French
administrative region in the north-east of the _Hexagone_, comprising
Alsace, Champagne-Ardenne, and Lorraine. ATMO Grand Est
is a not-for-profit, government-backed
association that is monitoring air quality in the region and looking
at ways to improve it.
As part of their work they have prepared energy flow diagrams, not
only for the whole region, but also on the communal level. More than
100 Sankey diagrams, depicting the energy flows and the use of energy
are available on the ATMO website. Visit the resources section
and check
“Diagrammes de Sankey” in the filter list at the right.
Here is the figure for the overall region with energy consumption and
use in Grand Est in 2017. Flows are in GWh.
On the left we see primary resources, with the largest source being
nuclear fuel. With an efficiency of only 33% this still delivers most
of the secondary energy consumed in the Grand Est region. The grey
stream from the top are “imports” to the region, most likely from
other parts of France (or from neighboring Germany). The energy
consuming sectors are shown on the right. A table next to them points
out the GHG emissions linked to the energy.
Each of the individual Sankey diagrams for the CCs (_communauté de
communes_, rural communities) and some CAs (_communauté
d’agglomération_, semi-urban communities) available have exactly
the same structure, but they can look strikingly different.
Here is one example from CC Portes de Meuse, a community with just
over 17,000 inhabitants
CC Portes de Meuse can apparently cover three-quarters of their energy
demand from wind and wood, with only 25% being imported. (Not sure
though how they can have 260 GWh energy use in road transport, unless
most vehicles are already electric).
Note that although both Sankey diagrams have a similar structure and
flows are both in GWh in 2017, this diagram mustn’t be compared
directly to the one above in regard to the width of the arrows, since
they are on a different scale.
Great work by ATMO Grand Est, and I am sure these visualizations are
useful when discussing energy consumption, GHG and air pollution among
stakeholders in the communities or the region. They have already
announced the Invent’AIR v2020 version to be published in the near
future.
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Samples
WOOD BIOMASS IN THE NETHERLANDS
__phineas __August 31,
2020
__Leave
a comment on Wood Biomass in The Netherlands
This Sankey diagram on wood biomass flows in the Netherlands is
featured in the study ‘Sustainable biomass and bioenergy in the
Netherlands’ by Goh, Mai-Moulin and Junginger from Utrecht
University.
Flows are in million tons (MT) dry mass for the year 2014. The diagram
has a very clear structure. Import streams are from the top and
exports leave to the bottom. Domestic Dutch production is from the
left, use of wood biomass in the Netherlands is to the right. Paper
and cardboard, alongside pulp are the largest flows, but mainly being
imported and exported again, or circulating domestically as recycled
paper.
The report has two other Sankey diagrams on oils and fats
and carbohydrates used in different sectors in the Netherlands. See
the full report here
.
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