renewable energy sources composed by dragica vasileska
TRANSCRIPT
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Renewable Energy Sources
composed by
Dragica Vasileska
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In the last 100 years, the Earth warmed up by ~1° C
100 years is nothing by geological time scales!
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Climate change due to natural causes (solar variations, volcanoes, etc.)
Climate change due to natural causes
and human generated
greenhouse gases
Can we predict the past?
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CO2 Concentration, Temperature, and Sea LevelContinue to Rise Long after Emissions are Reduced
100 years
1,000 years
Sea-level rise due to ice melting: several millennia
Sea-level rise due to thermal expansion: centuries to millennia
Temperature stabilization:a few centuries
CO2 stabilization:100 to 300 years
CO2 emissions
CO2 emissions peak0 to 100 years
Today
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The possibility / likelihood of
global warming is disturbing …… but there may be a bigger problem!
Chu
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Consumption of Energy Increased by 85% Between 1970 and 1999
20202015201020051999199519901985198019751970
700
600
500
400
300
200
100
0
Quadrillion Btu
History Projections
By 2020, Consumption will Triple
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World production of oil and gas is predicted to peak within 10 - 40 years
2010
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Energy conservation and efficiency can buy time
(a factor of ~2) but the fundamental problem remains
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Electrical generation
Switch from petroleum to coal and natural gas
Why has hydroelectric declined?
When did nuclear go up?
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Numbers = how long it would last if all energy came from one source
Resource recoverable recoverable and hoped for
Coal 125 1300
Petroleum 5 50?
Natural gas 5 50?
Oil shale 0 2500
Conventional reactors 3 15
Breeder reactors 115 750
Fusion 106 to 109
Geothermal surface 0.2 60
deep rock 0 600
Estimates of depletable energy resources in the U.S.
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Numbers = proportion of current U.S. energy needs that could be supplied for an indefinite period.
Tidal energy 0.1
Organic Waste 0.1
Photosynthesis 0.23
Hydropower 0.14
Wind Power 5
Solar radiation 740
Estimates of renewable energy
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(in the U.S. in 2002)
1-4 ¢ 2.3-5.0 ¢6-8 ¢ 5-7 ¢
Today: Production Cost of Electricity
6-7 ¢
25-50 ¢
Cos
t , ¢
/kW
-hr
Courtesy Nate Lewis
0
5
10
15
20
25
Coal Gas Oil Wind Nuclear Solar
Cost
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Energy Costs
0
2
4
6
8
10
12
14
$/GJ
Coal Oil Biomass ElectB
razi
l Eur
ope
$0.05/kW-hr
www.undp.org/seed/eap/activities/wea
Courtesy Nate Lewis
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Potential Sources of Energy when Fossil Fuels Run Out
Nuclear Fission
Magnetic Plasma Confinement,Inertial Fusion
Waste &Nuclear Proliferation
Nuclear Fusion
10 TW = 10,000 new 1 GW reactors: i.e., a new
reactor every other day for the next 50 years
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Solar, Wind and Water
We do not know how to store electrical energy on a massive scale
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Geothermal
Heat near surface of the earth = geysers, volcanoes, hot springs
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Photosynthesis Photovoltaic andelectricity to
chemical
H O
O H
2
22
sc M
e
sc
e
M
CO
Sugar
H O
O
2
2
2
Solar to Chemical Energy
Semiconductor/liquid junctions
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Energy gained in corn ethanol production
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Total CO2 emissions
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From Summary of Renewable Fuel Options (NCEP)
“Unlike corn ethanol, cellulosic ethanol has
potential to achieve near-zero net carbon
emissions.
Cultivation of cellulosic feedstocks requires
very low energy inputs and, if sustainably
managed, the carbon released during fuel
combustion is reabsorbed by the growth of
new feedstocks.”
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Use heat to make steam to turn turbine for electrical generation
Note: deep hot waters are corrosive to best to inject clean water in a closed system and bring it back to the surface as steam.
Geothermal Energy in More Details
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In U.S., much done on public land = cheap
Very little potential in east and mid west
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World wide distribution of volcanos, hot springs, etc.
Japan, Iceland,New Zealand big users of geothermal.
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Although hot areas near surface are limited, the earth is hot everywhere if you go down far enough.
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Bright idea!? – drill deep enough to find heat. Since rock is a poor conductor of heat, set off a big bomb to crack the rock and allow heat to move – then pump down water to make steam.
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Hydropower in More Details
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Hydropower = dams
Not much used in world, why??
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Norway, Zambia, Ghana big users
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Most unused hydropower in U.S. = Alaska,
In World = Canada, Russia
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Problems with hydroelectric
• Location = unused rivers are in extreme north or low population areas
• Competition with recreational uses (U.S.) and environmental concerns
• Hard to build dams in populated river valleys
• Siltation of dams – limited life.
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Tidal Power
1. In areas of large tides
2. Anywhere – build offshore dam
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Highest tides in the world = Bay of Fundy 16 meters = 48+ feet!
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Tidal power anywhere
1. No dam – but a turbine.
Problems:
1. Corrosion
2. Navigation
3. Appearance
4. Amount of energy available is low
5. Best tides are near poles – away from people.
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Banning Pass
Wind Power in More Details
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Wind Power Generation
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Best wind location = Aleutian Islands, why no wind development there?
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Best U.S. localities
Midwest, mountains
And coastal areas.
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Netherlands = coastal development
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Wind energy problems
• Location – near population center
• Bird migration –
• Visual
• Must be coupled with other sources of electricity (intermittent supply)
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Solar Energy in More Details
1. Solar Thermal
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At focal point = heat liquid – steam to turn turbine
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Solar Resource for a Concentrating Collector
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Big Plants
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2. Solar Photovoltaics
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‘hard’ vs ‘soft’ energy paths
Hard =
1. Big plants
2. Centralized production
Soft =
1. Decentralized
2. units per household
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Energy efficient house; wind power on roof. Solar panels for heat and electricity.
Decentralized
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Solar electricity generation
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Solar water heating solar air heating
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Solar house problems
• The Los Angeles air = smog
• Retrofitting- very expensive
• Hard for big hotels, Walmarts, etc.
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Solar house economics
• Add $16,000 to price of house
• Pay back - $1500 per year in energy costs
• 15 years to break even
Federal tax incentive; 40% of investment can be written off. Discontinued in 1986
City of Claremont – solar energy ordinance. 60% of hot water – solar
Exceptions for equivalent savings of energy = Colleges approach. Why not trust solar?