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Geothermal
Alternative Energy for the Future?
Geo what?
Geothermal!
from the Greek roots geo, meaning earth, and
thermos, meaning heat
thermal energy (heat) stored in Earth
geothermal gradient of temperatures
through the crust is 25–30 °C
per kilometer of depth
four main layers
heat of the Earth radiates outward
mantle melts at 300° F- 700°F
Is it done yet?
The Earth hasn't cooled yet
The center is extremely hot (6000 C) due to a
combination of radioactivity and residual heat
from the formation of the Earth
melted mantle makes molten magma…
magma reaches surface of crust and is called
lava
magma reaches crust and heats nearby rocks
and water
heated water can reach the surface and form
hot springs
So, how does it work?
Geothermal Gradient
The difference in temperature between the core
of the planet and its surface
Continuous exchange of
thermal energy from core
to surface
Yeah, but how?
Geothermal energy is produced by drilling a
well into the ground where thermal activity is
occurring
Once a well has been identified and a
well head attached, the steam is
separated from the water, the water
is diverted through a turbine engine
which turns a generator
The water is injected back into the
ground to resupply the geothermal source
The Bad News First:
Direct geothermal heating systems contain
pumps and compressors, which consume energy
Construction of plants can affect land stability
Professional installation: $25,000
Contrary to Native Worldview
Then the Good News:
Recycling the Earth’s energy
No heating bill
(but small electricity cost)
One time investment
Geothermal energy is clean,
no fuel is burned and therefore
no by product present
Native Worldview:
A Case from Hawaii
Conflict
 Opposing views of environment
Native opposition to geothermal energy
development
Native Hawaiians protested against geothermal
development
 Wao Kele O Puna rainforest development
Summary:
Geothermal energy uses the Earth’s thermal
gradient for heat and power
“Green” energy with few byproducts
Expensive
Contrary to native worldview
Personal preference
Questions?
Thank you for your attention!
Sources
 http://en.wikipedia.org/wiki/Geothermal_energy
 http://www.helium.com/items/324657-what-causes-a-volcano-to-erupt
 http://academic.evergreen.edu/g/grossmaz/heidtken.html
 http://climateprogress.org/2007/09/07/geothermal-an-underrated-climate-solution/
 http://www.odec.ca/projects/2007/truo7j2/geo.htm
 http://www.txucorp.com/responsibility/education/generation/geothermal.aspx
 http://en.wikipedia.org/wiki/Structure_of_the_Earth
 http://www.canada.com/reginaleaderpost/news/business_agriculture/story.html?id=f7f67b8f-42e2-4105-ad10-
bc4cd1d72cfa
 http://www.culturalsurvival.org/ourpublications/csq/article/hawaiis-rainforest-crunch-land-people-and-geothermal-
development
 http://www.informaworld.com/smpp/content~db=all~content=a905843913
 http://www.eia.doe.gov/cneaf/solar.renewables/page/geothermal/geothermal.html

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Geothermal alternative energy

  • 2. Geo what? Geothermal! from the Greek roots geo, meaning earth, and thermos, meaning heat thermal energy (heat) stored in Earth geothermal gradient of temperatures through the crust is 25–30 °C per kilometer of depth
  • 3. four main layers heat of the Earth radiates outward mantle melts at 300° F- 700°F
  • 4. Is it done yet? The Earth hasn't cooled yet The center is extremely hot (6000 C) due to a combination of radioactivity and residual heat from the formation of the Earth melted mantle makes molten magma…
  • 5. magma reaches surface of crust and is called lava magma reaches crust and heats nearby rocks and water heated water can reach the surface and form hot springs
  • 6. So, how does it work? Geothermal Gradient The difference in temperature between the core of the planet and its surface Continuous exchange of thermal energy from core to surface
  • 7. Yeah, but how? Geothermal energy is produced by drilling a well into the ground where thermal activity is occurring Once a well has been identified and a well head attached, the steam is separated from the water, the water is diverted through a turbine engine which turns a generator The water is injected back into the ground to resupply the geothermal source
  • 8. The Bad News First: Direct geothermal heating systems contain pumps and compressors, which consume energy Construction of plants can affect land stability Professional installation: $25,000 Contrary to Native Worldview
  • 9. Then the Good News: Recycling the Earth’s energy No heating bill (but small electricity cost) One time investment Geothermal energy is clean, no fuel is burned and therefore no by product present
  • 10. Native Worldview: A Case from Hawaii Conflict  Opposing views of environment Native opposition to geothermal energy development Native Hawaiians protested against geothermal development  Wao Kele O Puna rainforest development
  • 11. Summary: Geothermal energy uses the Earth’s thermal gradient for heat and power “Green” energy with few byproducts Expensive Contrary to native worldview Personal preference Questions? Thank you for your attention!
  • 12. Sources  http://en.wikipedia.org/wiki/Geothermal_energy  http://www.helium.com/items/324657-what-causes-a-volcano-to-erupt  http://academic.evergreen.edu/g/grossmaz/heidtken.html  http://climateprogress.org/2007/09/07/geothermal-an-underrated-climate-solution/  http://www.odec.ca/projects/2007/truo7j2/geo.htm  http://www.txucorp.com/responsibility/education/generation/geothermal.aspx  http://en.wikipedia.org/wiki/Structure_of_the_Earth  http://www.canada.com/reginaleaderpost/news/business_agriculture/story.html?id=f7f67b8f-42e2-4105-ad10- bc4cd1d72cfa  http://www.culturalsurvival.org/ourpublications/csq/article/hawaiis-rainforest-crunch-land-people-and-geothermal- development  http://www.informaworld.com/smpp/content~db=all~content=a905843913  http://www.eia.doe.gov/cneaf/solar.renewables/page/geothermal/geothermal.html

Notas del editor

  1. opposing views of environment natural resources to be managed Native Hawaiian beliefs regard nature as sacred Belief the lands and waters should remain undisturbed Specifically, geothermal energy development threatens the most sacred space in all Hawaii, the home and body of the fire goddess Pele