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Geothermal EnergyAlex Mayada, Chris Bartlow, Tim Fisher, Lauren Pawling
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Geothermal Energy: Introduction What is geothermal energy? Geothermal energy- energy that
comes from the ground; power extracted from heat stored in the earth Geo: earth Thermal: heat
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Geothermal Energy Generation
Direct Small scale uses Heating homes Hot springs Greenhouse heating Food dehydration
plants Agriculture
Crop drying Milk pasteurization
Electrical Dry steam Flash steam Binary cycle
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How Geothermal Works
Earth’s core heat Water → steam → drive electrical
generators Turbines Area specific
Geothermal energy is localized
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Dry Steam/Flash Steam/Binary Cycles
Each uses the heat from underground in some manner to generate energy
Different combinations of water temperatures create different effects
How Geothermal Energy Works
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Geothermal Energy: History
Used for bathing in Paleolithic times
Ancient Romans used it as a central heating system for bathing and heating homes and floors
1892: America’s first district heating system was put into place
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Example of a Power Plant in Larderello Today
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Geothermal Energy: History
1926: a deep geothermal well was used to heat greenhouses.
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Geothermal Energy: History
1960: Pacific Gas and Electric has first successful geothermal electric power plant in US at The Geysers Turbine lasted more than 30 years
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United States and Geothermal
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United States and Geothermal The US is now the world’s largest
geothermal producer Current bills are being processed to give
research towards geothermal projects $500 million
Pushing large scale production
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Can Geothermal Energy run out?
• 100% renewable Earth’s core is always going to be heated As long as there is a way to extract the energy
from the heat, the energy will always be available
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Environmental Effects/ Benefits Remarkable
difference of environmental effects compared to fossil fuels Leaves almost no
footprints Most hardware used
to extract geothermal energy is underground Minimal use of
surface
(http://www.geothermal.nau.edu/about/enviroment.shtmlNorthern Arizona University. 2009 Oct 27)
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Environmental Effects/Benefits
(http://www.geothermal.nau.edu/about/enviroment.shtml> Northern Arizona University. 2009 Oct 27)
Easy to operate Open up economy Much more
efficient use of land
Power Source
Land Requirement (ac/mW)
Geothermal 1-8
Nuclear 5-10
Coal 19
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Environmental Effects/ Disadvantages Fluids drawn from the
deep earth carry a mixture of gases
Pollutants contribute to global warming and acid rain
Construction of Plants can adversely affect land stability
Sources may hold trace amounts of toxic chemicals/mineral deposits
Loud Noises Initial start up cost
(expensive)
(http://www.geothermal.nau.edu/about/enviroment.shtml> Northern Arizona University. 2009 Oct 27)
Operation Noise Level (dBa)
Air drilling 85–120
Mud drilling 80
Discharging wells after drilling (to remove drilling debris)
Up to 120
Well testing 70–110
Diesel engines (to operate compressors and provide electricity)
45–55
Heavy machinery (e.g., for earth moving during construction)
Up to 90
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What social/political problems are posed?
Aesthetics Another funding avenue for government Initial start up
cost is costly Regulation Dispersion
Social Problems Political Problems
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Do any laws or regulations prevent the deployment of geothermal energy? Depends on state and specific
community: not any federal laws Factors to consider
Noise Aesthetics Proximity to houses Waste regulation (some use coolants)
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Can production be enhanced in those areas already developed? Yes the output is growing by 3:1 every
year Plants are already improving their capacity
factors Normally, plants are built on edges of
techtonic plates → allows geothermal energy extraction to be easier
The development of the binary cycle power plants and improvements in drilling and extraction technology allows geothermal systems to develop in a wider range
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Can production be developed in areas where geothermal is minimally developed?
Areas with high Geothermal energy potential Many “hot spots” have not
even been hit yet Ring of Fire: good
hydrothermal resources But with continuing
research and deeper drilling abilities, these “hot spots” won’t even matter Drills will be able to reach
farther down to draw energy from any source, whether or not is developed or a “hot spot”
(http://www.geothermal.nau.edu/about/enviroment.shtmlNorthern Arizona University. 2009 Oct 27)
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What evidence supports geothermal? New facilities produce electricity for
$.045/kW hour Price is declining compared to price of
fossil fuels, which is increasing The US can produce and 950,000
megawatts of power but are currently only producing 2,800 megawatts of power This number is going to constantly increase
with new technologies and research
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Opposition to Geothermal Energy Not everyone agrees that geothermal
energy is a solution to our energy crisis Too costly Noise Use of fresh water Land surveying The technology is not quite there Some people just believe that our fossil
fuels will “never” run out Don’t believe that fossil fuels are finite
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Conclusion
Overall, geothermal appears to be a sound solution to energy needs
Geothermal energy has the ability to expand
Few environmental effects Very cost efficient Geothermal is RENEWABLE
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Citations Wikipedia article on Geothermal Power Geothermal Education Office website US Department of Energy Geothermal Technologies Program website International Geothermal Association website
Renewable Energy Access website on geothermal energy Online chapter on geothermal energy by Energyquest Union of Concerned Scientists geothermal website
Geothermal Energy Association
World of Energy factsheets
Andy Darvill web resource on geothermal Clean Energy Ideas web resource
Article on geothermal advantages and disadvantages Comments by Jasmin Malik Chua Article in USA Today Website from Northern Arizona University Link to report evaluating sedimentation caused by geothermal in