apes
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APES. Get out notebook paper – NO SPIRAL FRINGE Everything else away except a writing utensil. . Nonrenewable Energy. Ch. 15 . What types of energy do we use? . Direct SOLAR ENERGY Indirect SOLAR ENERGY COMMERCIAL ENERGY. 1. DIRECT SOLAR ENERGY. Photovoltaic Cells Solar Thermal. - PowerPoint PPT PresentationTRANSCRIPT
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APES1. Get out notebook paper – NO
SPIRAL FRINGE2. Everything else away except a
writing utensil.
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Nonrenewable Energy
Ch. 15
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What types of energy do we use?
1. Direct SOLAR ENERGY2. Indirect SOLAR ENERGY3. COMMERCIAL ENERGY
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1. DIRECT SOLAR ENERGY
Photovoltaic Cells Solar Thermal
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2. INDIRECT SOLAR ENERGYBiofuelsWind turbinesHydroelectric dams
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3. COMMERCIAL ENERGY• From
nonrenewable resources
• Extracting/burning nonrenewable resources (FOSSIL FUELS)
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Energy Use: World & US
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Energy UseWORLD• 85% Nonrenewable• Use of coal • Use of oil• Nuclear leveled off• Developing
countries depend on biomass (fulewood, charcoal) for heating/cooking – can’t afford fossil fuels
US• 93% Nonrenewable• World’s largest
energy user• 5% of world’s
population uses 25% of world’s energy
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FOSSIL FUELS *• Composed of partially
decayed organism remains
• Nonrenewable• Form too slowly to
replenish• NOT sustainableEX: Coal, Oil, Natural Gas
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Fossil Fuels• OIL, NATURAL GAS, & COAL• Oil and gas are less dense than
coal • Move upward through porous rock
and become trapped
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Formation of Fossil FuelsFormation of Coal- Over time, plants die, covered by water and sediment - Heat and pressure convert material into carbon rich ore (COAL) and sedimentary rock. Formation of OilDeath and buildup of microscopic aquatic organisms. Heat and Pressure convert material to hydrocarbons (OIL) without oxygen in sediments that prevent decay. Formation of Natural Gas Same as oil, just produced at higher temperatures than oil.
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FOSSIL FUELSDeveloped countries consume 8x MORE energy than developing countries
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What is Net Energy and why is it important?
Net energy is the amount of high-quality energy available from an energy resource minus the amount of energy needed to make it available.
Net Energy =Total amount of useful energy available
Energy needed to make it available-
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Basic Science: Net Energy is the only energy that really counts
• First law of thermodynamics:– It takes high-quality energy to get
high-quality energy– Pumping oil from ground, refining
it, transporting it
• Second law of thermodynamics– Some high-quality energy is wasted
at every step
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Net Energy RatioEnergy Produced : Energy Used to Produce itNet Energy Ratio , Net Energy
Conventional Oil = HIGH net energy ratio, But decreasing
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Fig. 15-3a, p. 373
Space HeatingPassive solar 5.8
Natural gas 4.9
Oil 4.5
Active solar 1.9
Coal gasification 1.5
Electric heating (coal-fired plant) 0.4
Electric heating (natural-gas-fired plant) 0.4
Electric heating (nuclear plant) 0.3
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Fig. 15-3b, p. 373
High-Temperature Industrial Heat
Surface-mined coal 28.2
Underground- mined coal 25.8
Natural gas 4.9
Oil 4.7
Coal gasification 1.5
Direct solar (concentrated) 0.9
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Fig. 15-3c, p. 373
Transportation
Natural gas 4.9
Gasoline (refined crude oil)
4.1
Biofuel (ethanol) 1.9
Coal liquefaction 1.4
Oil shale 1.2
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Net EnergyEnergy sources with low/negative net energy cannot compete in open markets with alternatives that have higher net energy yields
EX. Nuclear power
Need subsidies from taxpayers
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Reducing Energy Waste Improves Net Energy Yields and Can Save Money
• 84% of all commercial energy used in the U.S. is wasted– 43% after accounting for second
law of thermodynamics
Drive efficient cars, not gas guzzlers
Make buildings energy efficient
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In 2008: Energy Use in US Comprised of
Oil 40%Natural Gas 23%Coal 20%Nuclear Power 8%Hydropower 3%Biomass 3%Geothermal, 1%Solar & wind
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We depend heavily on oil• Petroleum or crude oil • Composed of various hydrocarbons• Produced by decomposition of dead organic
matter from plants/animals
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We depend heavily on oilPeak production: time after which production from a well declines
– Global peak production for all world oil
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Oil Extraction & Refining
By boiling point temperature
Lowest Boiling Point Gases
Gasoline
Aviation fuel
Heating oil
Diesel oil
Naphtha
Heated crude oil
Grease and wax
Furnace Asphalt
Highest Boiling Point
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PetrochemicalsRaw materials used in
manufacturing
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How long might conventional supplies of oil last?
SHORT ANSWER = ???????• Rapid increase of use since 1950
• Largest consumers in 2009– United States, 23%– China, 8%– Japan, 6%
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How long might conventional supplies of oil last?
• Proven oil reserves– Identified deposits that can be extracted
profitably with current technology
• Unproven reserves– Probable reserves: 50% chance of recovery– Possible reserves: 10-40% chance of recovery
Proven and unproven reserves will be 80% depleted sometime between 2050 and 2100
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OPEC Controls Most of the World’s Oil Supplies
Organization of Petroleum Exporting Countries (OPEC)• 13 countries have at least 60% of the
world’s crude oil reserves – Saudi Arabia: 20%– United States: 1.5%
• Global oil production leveled off in 2005
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The United States Uses Much More Oil Than it Produces
• Produces 9% and Uses 23%• 1.5% of World’s Proven Oil Reserves –
most in Environmentally sensitive areas
• Import 52% of our oil for $ 200 billion
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What are our options? 1. Look for more oil2. Use less oil 3. Waste less oil 4. Use other energy sources
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Oil to be Found1. Conventional oil: smaller,
dispersed, and harder to find 2. Heavy oil from existing wells3. Unconventional Oil – Tar sands &
oil shales
$$$$$$ & Low Net Energy
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Proven & Unproven Reserves in N. America
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Bakken Oil FormationUnder parts of Montana, S. Dakota, N. Dakota, & Canada2008 U.S. Geological Survey Projections over next 20 years- 10% of estimated conventional &
unconventional oil in unproven reserves could be removed
- Low net energy- High environmental costs- New oil meet current U.S. needs for only 1
year.
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Arctic National Wildlife Refuge
Fragile Arctic Tundra– Extremely cold/dry conditions– Short growing season– Permafrost– Shallow/nutrient poor soils– Slow Growth/decomposition rates– Specialized species– Low biodiversity
How would drilling affect this ecosystem?
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Crude Oil in the Arctic National Wildlife Refuge
Fig. 15-5, p. 376
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ANWR• Crude oil that might be found
tiny fraction of U.S. Oil Consumption
• Would take 10 – 20 years to develop this oil supply
• Only lower gas prices by 6 cents/gallon
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ANWR• ANWR meet current world
demand for only 1 – 5 months and U.S. demand for 7 – 24 months
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The United States cannot even come close to meeting its huge and growing demand for crude oil and gasoline by increasing domestic supplies. U.S. Energy Consumption by Fuel
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Fig. 15-6, p. 377
Trade-OffsConventional Oil
Advantages
DisadvantagesAmple supply
for several decades
Water pollution from oil spills and leaks
High net energy yield but decreasing
Environmental costs not included in market price
Low land disruption
Releases CO 2 and other air pollutants when burned
Efficient distribution system
Vulnerable to international supply interruptions
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3 caveats when evaluating future oil supplies
1. Potential reserves are not proven reserves
2. Must use net energy yield to evaluate potential of any oil deposit
3. Must take into account high global use of oil
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Natural Gas• Mixture of
gases• 50 -90%
Methane (CH4)• Versatile with
high net energy
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Natural Gas Uses• Heat space & water• Produce electricity
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What are the advantages & disadvantages to using Natural
Gas? - more plentiful than oil - has a high net energy yield - fairly low cost- lowest environmental impact of
all fossil fuels.
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Formation of Natural Gas• Same as oil, just produced at
higher temperatures• Conventional natural gas – lies
above most reservoirs of crude oil
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Conventional Natural Gas
– Pipelines– Liquefied petroleum gas
(LPG)– Liquefied natural gas (LNG)
• Low net energy yield• Makes U.S. dependent
upon unstable countries like Russia and Iran
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Coal• Solid fossil fuel • Burned in power plants
(inefficient)
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What are the advantages & disadvantages of using coal?
- Plentiful - high net energy yield - low cost- very high environmental impact.
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What are the advantages & disadvantages of coal?
Gaseous and liquid fuels produced from coal - could be plentiful- have lower net energy yields - higher environmental impacts
than conventional coal has.
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Coal is a plentiful, but dirty fuel
• World’s most abundant fossil fuel– US = 28% of proven reserves
• Environmental costs of burning coal– Severe air pollution
• Sulfur released as SO2
• Large amount of soot• CO2
• Trace amounts of Hg and radioactive materials
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Coal Formation
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Increasing moisture content Increasing heat and carbon content
Peat (not a coal)
Lignite (brown coal)
Bituminous (soft coal)
Anthracite (hard coal)
Heat Heat Heat
Pressure Pressure Pressure
Partially decayed plant matter in swamps and bogs; low heat content
Low heat content; low sulfur content; limited supplies in most areas
Extensively used as a fuel because of its high heat content and large supplies; normally has a high sulfur content
Highly desirable fuel because of its high heat content and low sulfur content; supplies are limited in most areas
Stepped Art
Fig. 15-14, p. 382
Stages in Coal Formation
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How do coal power plants produce energy?
Fig. 15-15, p. 382
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CO2 Emissions Per Unit of Electrical Energy Produced for Energy Sources
Fig. 15-17, p. 383
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Coal
Advantages Disadvantages
Ample supplies in many countries
Severe land disturbance and water pollution
Fine particle and toxic mercury emissions threaten human health
High net energy yield
Emits large amounts of CO2 and other air pollutants when produced and burned
Low cost when environmental costs are not included
Trade-Offs
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The clean coal & anti-coal campaigns
• Coal companies and energy companies fought– Classifying carbon dioxide as a pollutant– Classifying coal ash as hazardous waste– Air pollution standards for emissions
• 2008 clean coal campaign– But no such thing as clean coal
• “Coal is the single greatest threat to civilization and all life on the planet.” – James Hansen
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Solutions for “Clean Coal”
• 60 Minutes : Clean Coalhttp://www.youtube.com/watch?v=Z94VIGaXxho&feature=related
• http://www.youtube.com/watch?v=BgO
EQLqPkuY&feature=fvwrel
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Solutions for “Cleaner Coal”
• Install Scrubbers (Desulfurization systems)
• Used to clean power plant exhaust
• Chemicals in scrubber react with pollution causing it to precipitate out
• EXPENSIVE, but EFFECTIVE
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Solutions for “Cleaner Coal”
Legislation to reduce emissions- 1990 Clean Air
Act Amendments
- Cut emissions and require installation of scrubbers
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Solutions for Clean Coal• Clean Technology “Clean Coal”• EX. Fluidized Bed Combustion • mix hot air w/coal and limestone at
lower temps • NOx produced • Sulfur PPTs out • Scrubbers not needed • Still emits CO2 gas
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Burning Coal More Cleanly
Fluidized-Bed Combustion
Fig. 15-32 p. 364
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