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Geothermal Energy

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Emily Lin

on 26 April 2010

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Transcript of Geothermal Energy

Geothermal Energy Emily Lin Geo = earth
Thermal = heat How Geothermal Energy Works The earth's core yields heat that flows outward
It conducts to the mantle and becomes magma
The magma convects to the crust The heated water can come up as hot springs or
geysers but most stay underground as a reservoir Benefits of Geothermal Energy Provides relatively clean and safe energy using little land
Can be built in the middle of crops, deserts, and forests
Renewable and sustainable
Conserves fossil fuels
Does not need importing. Benefits local economies. Geothermal Electricity Wells can be drilled into geothermal reservoirs and the hot water can be used to generate electricity
Dry steam power plant - steam is used
Flash power plant - hot water is used
Binary power plant - hot water + binary liquid is used Direct Uses of Geothermal Energy When geothermal water is 50°F to 300°F, it is not hot enough to generate electricity, but it can be used directly in... Balneology (hot spring and spa bathing)
Agriculture (greenhouse and soil warming)
Aquaculture (fish and alligator farming)
Industrial uses (product drying and warming)
Space heating of buildings and districts District Heating of Reykjavik, Iceland Alligators Maoris Native Americans Reykjavik, 1937 Reykjavik, 2000 Geothermal Heat Pumps Can be used anywhere since they do not need geothermal reservoirs
Underground pipe transfers heat into buildings in the winter, out of buildings in the summer
Energy and cost efficient
Fdsfsd Emily E E E ddfsdf dd Economic viability Geothermal energy requires higher initial investments ($2500 per installed kW)
Operating costs are $0.05 per kWh.
Investment provides jobs, expands local and national economy, and avoids importing and exporting fuels Disadvantages Depletion of resources ten times rate of replenishment
Damage to geothermic features
Subsidence. Decreases pressure in reservoirs
Polluting waterways with arsenic, lithium, boron
Air emissions of CO2 and H2S Conclusion Benefits of geothermal energy outweight drawbacks
Renewable, cheap, and relatively clean
We cannot keep on using up our natural resources
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