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# Energy Conservation & Sankey Diagrams

The Law of Conservation of energy, energy efficiency and how to read and draw Sankey diagrams.
by Collene Lamonte on 28 November 2012

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#### Transcript of Energy Conservation & Sankey Diagrams

Energy Conservation & Sankey Diagrams The Law of Conservation
of Energy Energy cannot be created or destroyed.
Energy is only converted from one form to another. Energy Efficiency Sankey Diagrams Sankey Diagrams show how energy flows through a system.
They show:
form of energy
amount of energy
energy that is input
useful energy output
wasted energy output Useful vs. Wasted Energy Not all energy is "useful"
Useful Energy is defined as energy that is actually used for the purpose of the machine or activity.
Energy produced that does not accomplish the intended task is "Wasted". Example:
What is the efficiency of a hair dryer that uses 180 J of electrical energy and converts it into 70 J of heat energy, 80 J of mechanical energy and 30 J of sound energy? Energy Efficiency 83% X 100% = 180 J 150 J Eff = Input energy: 180 J Electrical Wasted energy: Sound (30 J) 70J + 80 J = 150 J Solution:
Useful energies: Heat and Mechanical Energy Efficiency 100% X Input Energy Useful energy out Efficiency = Energy Efficiency How do energy conversions work? Types of Power Plants Fossil Fuel - Coal, Natural Gas
Hydroelectric - using water
Geothermal - using earth's heat
Nuclear THE END Fossil Fuel Power Plant Chemical Potential Energy
(Coal, Natural Gas) HEAT
(Useful) Light
(Wasted) Kinetic - Steam moving
(Useful) Heat
(Wasted) Sound
(Wasted) Mechanical - spinning turbines
(Useful) Heat
(Wasted) Sound
(Wasted) Electricial Energy
(Useful) Heat
(Wasted) Sound
(Wasted) Kinetic
(Wasted)
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