Energy Sources. Non-renewable? Non-renewable Finite (being depleted – will run out) In general...
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Transcript of Energy Sources. Non-renewable? Non-renewable Finite (being depleted – will run out) In general...
![Page 1: Energy Sources. Non-renewable? Non-renewable Finite (being depleted – will run out) In general from a form of potential energy released by human action.](https://reader036.fdocuments.us/reader036/viewer/2022062407/56649d2c5503460f94a01ad3/html5/thumbnails/1.jpg)
Energy Sources
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Non-renewable?
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Non-renewable
• Finite (being depleted – will run out)
• In general from a form of potential energy released by human action
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Fossil fuels – Coal, oil, gas
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Nuclear fuels
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Renewable?
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Renewable
• Will not run out (in the near future)
• Mostly directly or indirectly linked with the sun (the exception is tidal energy)
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Photovoltaic cells
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Active solar devices
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Wind
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Wave
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Tidal
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Biomass
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World energy production
Fuel % total energy production
CO2 emission g.MJ-1
Oil 40 70
Natural gas 23 50
Coal 23 90
Nuclear 7 -
Hydroelectric 7 -
Others < 1 -
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Energy Density
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Energy Density
• The energy that can be obtained from a unit mass of the fuel
• J.kg-1
• If the fuel is burnt the energy density is simply the heat of combustion
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Energy density
• Coal - 30 MJ.kg-1
• Wood - 16 MJ.kg-1
• Gasoline – 47 MJ.kg-1
• Uranium – 7 x 104 GJ.kg-1 (70000000 MJ.kg-1)
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