geothermal energy - the university of new...
TRANSCRIPT
Mechanical EngineeringME217 Energy, Environment & Society
ME 217: Energy, Environment & Society Fall 2015
Geothermal energy
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Clicker question
What will be the dominant source of electricity in 2050?
Nuclear fusion
Fossil fuels
Solar
Wind
Biofuels
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Voyage to the Center of the Earth
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Temperature gradients in the U.S.
3.5 kmdepth
6.5 kmdepth
10 kmdepth
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Potential of geothermal resources
remember: the U.S. uses 100 quads per year of primary energy
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Tectonic plate motion
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Geothermal resources worldwide
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Structure of water / steam reservoir
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The dry steam cycle
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The flash steam cycle
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Typical plant layout
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Early geothermal electricity
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Still going after many years
the dry steam plant at Larderello, Italy now
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The Geysers plant in California
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A flash steam plant
Imperial Valley geothermal project in California –combined capacity 370 MW
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The binary cycle (ORC)
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A binary / flash power plant
30 MW Puna power plant in Hawaii – a hybrid flash steam andbinary geothermal system
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Efficiency vs. resource temperature
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Geothermal electricity to date
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direct uses of geothermal energy
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Direct use of geothermal to date
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Where to now?The Future of Geothermal Energy
An Interdisciplinary MIT Study
http://mitei.mit.edu/publications/reports-studies/future-geothermal-energy
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The Hot Dry Rock concept
schematic of HDR plant experimental HDR plant atFenton Hill, New Mexico
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“Geothermal” heat pumps
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How much does geoelectricity cost?
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How much does geoheat cost?