Renewable Energy

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Renewable Energy
The Real Alternative?
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Module Overview
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Why Bother?

• Because energy resources are limited
• Oil and gas will run out, probably in your
  lifetime
• Because burning fossil fuels release greenhouse
  gases and pollutants
• Affecting your environment and health
• Because you can do something about it
• Using your energy and vote

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Lesson 1 Does it all add up?
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Part 1How much energy do we use?
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Starting in YOUR Household

• How much energy do you use?

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Calculating power and energy
(100 x 4) (50 x 20) 1400 watts hours
Daily energy
Power x time
Daily energy/Daily hours 58 watts (W)
Average power
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How much power per household?
Equipment Group Ave. power
Lights 1
TV 2
Computers 3
Cooking 4
Washing 5
Cars 6
Food 7
Heating 8
Total average power per household ????
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Experiments

• Split into seven groups
• Use equipment supplied to estimate the average
  power consumed in a typical household
• Report back to the class when complete
• Use the information to estimate the total average
  power used by a typical family
• Consider the error involved in this estimation

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How much power per person?
but..thats not all
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How much power per person?
but..thats still not all
You!!
You are responsible for about 6000W of power
consumption!!!!
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How much energy in world?
38 TW World power use
but, most of the world dont burn energy like
usyet!
Actual total is 15 TW now (www.rcep.org.uk)
Predicted to rise to 20 TW by 2020
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Big numbers
1 watt standard unit of power 1 joule per
second 1 W
1,000 watts 1 thousand watts 1 kilo-watt 1
kW
1,000 kilo-watts 1 million watts 1 mega-watt
1 MW
1,000 mega-watts 1 billion watts 1 giga-watt
1 GW
1,000 giga-watts 1 trillion watts 1 tera-watt
1 TW
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Part 2Where does the energy come from?
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The sun provides more than 99.9 of our primary
energy
It is a nuclear reactor 200,000 trillion times
more powerful than nuclear power stations
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Solar energy
Power arriving at the earth is 200,000 TW (2x1017
watts)
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Checking the balance
200,000 tera watts
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Where does the solar energy go?
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Renewable Energy - Overview
Sun
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Solar Energy - Heating
Sun
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Solar Energy
Photovoltaics
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Energy from Rivers (Hydro)
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Demonstration

• Several demonstrations of energy processes around
  classroom
• Evaporation-condensation cycle
• Solar-powered wind turbines
• Wind-up radios
• Tap water powered hydro-turbines
• Make a note of the energy conversions and
  estimate the power involved

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Energy from Rivers (Hydro)
Dam
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Energy from Rivers (Hydro)
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Energy from Wind
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Energy from Wind
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Wind Turbine Generators
Your house
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Energy from Waves
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Energy from Waves
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Other Wave Devices
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Energy from Biomass
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Energy from Biomass
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Summary
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Coming nextYour turn!
Group 7 Energy transport
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The End