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# Energy Efficiency and Sankey Diagrams

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by

## DJ Edmondson

on 15 November 2013

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#### Transcript of Energy Efficiency and Sankey Diagrams

Kinetic
Chemical Sound
Thermal
Energy Efficiency
LO: To be able to describe energy transfers and represent them in a diagram.
Describe energy transfers. (Grade D)
Represent transfers as Sankey diagrams (Grade C)
Compare the efficiencies of different appliances (Grade B)
Kickstart
What is the 'useful' energy?
Representing Energy Transfers
Sankey Diagrams
Filament light bulb
Wednesday, 16th October 2013
Can you identify the useful energy being produced in the clips?

EXT: Can you also identify the initial/starting energy?
What do we mean by useful?
This is very simple but doesn't give
us much information
10 J light energy
(output)
10 J light energy
(output)
100 J
electrical
energy
(input)
90 J heat energy
(wasted)
20 J
electrical
energy
(input)
10 J heat energy
(wasted)
A Sankey diagram uses arrows to represent all the output energies.

All the energy transfers (useful and wasted) that are associated with a device can be represented by a Sankey diagram.

The thickness of each arrow is proportional to the amount of energy involved at that stage.

Energy efficient light bulb
Proportional: The size of the arrow corresponds to the amount of energy
You are going to work through several examples of how to draw Sankey diagrams.
Use a separate piece of squared paper for each example
Draw each stage of the Sankey diagram as shown on the slide and label it.
Instructions
Eg. A food mixer converts 700J of energy into 150J of useful energy
Input Energy:
Useful Output Energy:
Wasted Energy:
2) Decide how many joules of energy each square represents
1 square
= 100J
3) Draw a line on the left hand side to represent the INPUT ENERGY
1 square
= 100J
4) Label this with the type of energy it is

1 square
= 100J
700J
electrical
energy
5) Draw an arrow across the top showing the USEFUL OUTPUT ENERGY and label it
1 square
= 100J
700J
electrical
energy
150J
kinetic
energy
6) Draw an arrow down to show the WASTED ENERGY transfer and label it.
1 square
= 100J
700J
electrical
energy
150J
kinetic
energy
550J sound
and heat energy
7) Draw a line to finish off the diagram

1 square
= 100J
700J
electrical
energy
150J
kinetic
energy
550J sound
and heat energy
Draw Sankey diagrams to show the efficiency
of the following electrical devices:
Draw them on squared paper. Use a new piece of paper for each. Stick them in your book
electrical
energy
(input)
light energy
(output)
heat energy
(wasted)
EXT: Calculate the % efficiency of these appliances
.
Why is energy efficiency important?
New electrical appliances display information about how energy efficient they are.
.
Why is energy efficiency important?
This helps consumers to identify which appliance will use the least energy and cost the least to run.
Energy efficiency is not just about saving money, it’s also about saving the planet.
Appliances that are more efficient need less electricity, and so less fossil fuel needs to be burnt in fossil-fuel power stations.
Has any of the lesson so far been about you?
What connections have you made?
How have you got involved in the lesson?
What should you do to further your thinking?
What breakthroughs have you made?
What do you want to know more about?
Choose one question to answer
How are you going to remember this learning?
What is the key aspect you will remember from this lesson?
What has this lesson reminded you of?
Which senses were most important?
What did you learn that you didn’t know before?
What have you learnt that could be useful elsewhere?
What have you learnt elsewhere that is like this?

Choose one
Full transcript