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What is geothermal energy ?
Geothermal energy- energy that comes
from the ground; power extracted fromheat stored in the earth
Geo: earth
Thermal: heat
http://geothermal.marin.org/video/vid_pt1.htmlhttp://geothermal.marin.org/video/vid_pt1.html7/31/2019 Renewable Energy - Geothermal Energy
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Direct
Small scale uses
Greenhouseheating
Food dehydrationplants
Agriculture Crop drying
Milk pasteurization
Electrical
Dry steam
Flash steam
Binary cycle
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Earths core heat
Water steam drive electrical
generators Turbines
Area specific
Geothermal energy is localized
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1926: a deep geothermal well was usedto heat greenhouses.
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1960: Pacific Gas and Electric has firstsuccessful geothermal electric powerplant in US at The Geysers
Turbine lasted more than 30 years
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a hole is drilled
steam and water travel up this liner
master valve at the top - to control the flow andthen a pipeline carries the water and the steam
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water to a re-injection well
The steam is sent to the powerstation
Turbine - turbine blades - produces the electricity
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It is renewable
It doesnt cause pollution
Owners of buildings using geothermal have cut 25 to 50 percent off their
utility bills.
No cooling towers, rooftop units, or individual room air conditioning units
are needed, so buildings and schools using geothermal systems look
better.
Theres no fire hazard and no outside equipment that could potentiallyhurt kids
Geothermal systems are quieter, more reliable, more efficient, and more
compact compared to regular heating and cooling systems.
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100% renewable
Earths 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 beavailable
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Not produce any pollution & does not contribute to the
greenhouse effect.
The power stations do not take up much room, sothere is not much impact on the environment.
No fuel is needed.
Once built a geothermal power station, the energy is
almost free.It may need a little energy to run a pump, but this canbe taken from the energy being generated.
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Not many places where you can build a geothermalpower station - need hot rocks of a suitable type, at a
depth where we can drill down to them.The type of rock above is also important, it must be ofa type that we can easily drill through.
Sometimes a geothermal site may "run out of steam",
perhaps for decades. Hazardous gases and minerals may come up from
underground, and can be difficult to safely dispose of.
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Not everyone agrees that geothermal energyis 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 Dont believe that fossil fuels are finite
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Overall, geothermal appears to be asound solution to energy needs
Geothermal energy has the ability toexpand
Few environmental effects
Very cost efficient Geothermal is RENEWABLE
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