Energy Concepts
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Transcript of Energy Concepts
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Energy Concepts
• Energy– “The ability to do ___________”.
• Energy Laws– neither created or destroyed– High quality to low quality - heat
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Energy Resources
• Renewable Energy
– Hydroelectric– Wind – Solar– Biofuels– Hydrogen cell– Geothermal
• Nonrenewable Energy
– Oil– Coal– Natural gas
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Worldwide Energy Sources• Using prior knowledge or educated
guesses, divide a circle (pie) into sections that best represent the percentage that each of the following energy sources contributes to the world’s supply.
Fossil fuel power, nuclear power, hydroelectric power, wind power and solar power
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Worldwide energy sources
84%
7%7% 2%
fossil fuel
nuclear power
hydroelectricpower
wind and solarpower
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Oil
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Oil Trivia Facts
• Crude Oil = oil pumped from the ground.– Petroleum means “oil that comes
from rock”
• History– 347 800ft. wells drilled in China– Discovered in 1859 in Titusville,
Pennsylvania!• Used for medicine $40/barrel
• Known reserves expected to last less than 50 years!– Current price per barrel: $86
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What is oil?• Petroleum (crude oil)
– complex liquid mixture of hydrocarbons, with small amounts of S, O, N impurities
• Most valuable natural resource (?)– Gasoline, heating oil, jet fuel,
grease, wax, asphalt, plastics…
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Formation of Oil
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Oil Formation
• Decomposition of ancient sea plants & animals– Quick burial – Partial decayed (some carbon remains)
• Intense heat & pressure
• Time – millions of years to form
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Oil Extraction
• Primary Oil Recovery– Drill well– Pump out oil that flows by
gravity into well
• Secondary Oil Recovery– Inject water into nearby
water to force oil into well.
http://www.absorblearning.com/media/item.action?quick=11h
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Enhanced (Tertiary) Oil Recovery
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Recovery & Net Energy
• In any oil field, only 1/3 of the heavy oil can actually be recovered by 1st or 2nd –ary methods
• Tertiary recovery uses the energy of 1/3 of a barrel of oil for each barrel it produces
• http://www.youtube.com/watch?v=QVMRu7GjR7o&feature=related (<4min)
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Fractional Distillation
• From extraction, oil travels via pipeline to a refinery
• Impurities are removed
• Oil is heated, which separates the various liquids by various boiling points
http://www.absorblearning.com/media/item.action?quick=11khttp://www.absorblearning.com/media/item.action?quick=11o
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What is petroleum used for?
• Fuel – transportation (65%), generating electricity
• Making products - plastic, fleece, ink, floor wax, soap, carpet, nail polish, aspirin, etc. (over 6,000 products)
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Where are Gas & Oil found?Oil Reserves in…
• United States
• Middle East
• Venezuela
• North Sea
• Siberia
• Nigeria
Seal Rock/Cap
Reservoir Rock
Source Rock
http://www.absorblearning.com/media/item.action?quick=11h
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OPEC
• Organization of Petroleum Exporting Countries
– Set up in 1960 so developing countries would get a fair price for the resource.
– Control 67% of world’s oil
– Saudi Arabia (#1), Iraq (#2), Iran, Kuwait, UAE, Algeria, Libya, Nigeria, Ecuador, Gabon, Indonesia, Qatar, and Venezuela
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Oil in U.S.Oil in U.S.•2.3% of world reserves
•uses nearly 30% of world reserves;
•65% for transportation;
•increasing dependence on imports.
www.bio.miami.edu/beck/esc101/Chapter14&15.ppt
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Oil Reserves
• Estimated reserves: educated guesses about the location and size of oil or natural gas deposits
• Proven reserves: how much oil can be economically obtained from the oil field
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Future of Reserves
• Economically depleted– When 80% of a resource has been used– Cost to extract remaining supply is more
expensive than its sale price.
• At current usage• 33 years to economic depletion! • How much is undiscovered?• Should we conserve?
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Why change when you’ve found a good thing?
• Low oil prices = stimulated economic growth• In turn...
– discourages improvements in energy efficiency and alternative technologies
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Environmental Concerns
• Pollution - many pollutants created when burned which leads to smog and acid rain
• Global Warming - releases CO2 when burned
• Oil Spills - damage to plants and animals
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ANWR and offshore drilling
• http://www.youtube.com/watch?v=DjfssrKGsBU – Jay Leno
• http://www.cbsnews.com/video/watch/?id=6351721n – Obama offshore drilling
• http://www.youtube.com/watch?v=QP2GejkLdwA – ANWR and offshore
• http://www.youtube.com/watch?v=bO_3eiOPuqE (1:30)
• http://ngm.nationalgeographic.com/ngm/0605/sights_n_sounds/– http://ngm.nationalgeographic.com/ngm/0605/feature1/
index.html - drilling in Alaska article
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Crude Oil Alternatives
Greener oil options?
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Oil Shale Oil Shale (kerogen) & Tar Sand Tar Sand (bitumen)
• Different forms of rock/sand that can be transformed (crushed/heated or pressurized) to be use like crude oil.
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Global supplies of shale oil may be 200x’s larger than global ConventionalOil supplies
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Oil Shales Pros/Cons• Pros
– US availability– World supplies
• Cons– Processing
• Uses ½ barrel of oil to process (heat)
• Uses large amounts of water (in desert areas!)
• Surface mining
• Groundwater contamination (salts, carcinogens, & toxic metals)
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Should we use oil?
PROS• High net energy
yield
• Low cost (with subsidies)
• Easily transported
CONS• Low reserves
• Artificially low price causes waste and discourages alternatives
• Air pollution (smog, acid rain)
• Global warming
• Oil spills and water pollution