Lecture_17

Lecture_17 - Pizza Lunch for all Survivors CISX-Patio...

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1 EE243. Semiconductor Optoelectronic Devices (Winter 2010) Prof. J. S. Harris 1 Pizza Lunch for all “Survivors” CISX-Patio Thursday 11:45 March 11 Final Exam Wednesday, March 17 7-10 PM Room 380X Please go to AXESS for online course evaluation EE243. Semiconductor Optoelectronic Devices (Winter 2010) Prof. J. S. Harris 2 Environmental Challenges Energy Requirements Photovoltaic Conversion Thin Film Solar Cells Concentration Systems Multijunction Solar Cells 7. Solar (Photovoltaic) Cells
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2 EE243. Semiconductor Optoelectronic Devices (Winter 2010) Prof. J. S. Harris 3 Future Energy Information Dr. Nathan Lewis http://nsl.caltech.edu By 2050 we need 10’s of TW of carbon-free power Carbon-Free Power: Nuclear, Carbon Sequestration, Renewable This much nuclear power would require 10,000 new plants Carbon Sequestration (clean fossil fuel plants) unproven Not enough Hydroelectric, Wind, Geothermal, or Biomass Solar is the only proven renewable option Solar Technologies are currently too expensive 2 nd and 3 rd Generation PV could reduce cost to be more viable EE243. Semiconductor Optoelectronic Devices (Winter 2010) Prof. J. S. Harris 4
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3 EE243. Semiconductor Optoelectronic Devices (Winter 2010) Prof. J. S. Harris 5 - Last Glacial Maximum to Present Atmospheric CO 2 Concentration EE243. Semiconductor Optoelectronic Devices (Winter 2010) Prof. J. S. Harris 6 South Pole Carbon Dioxide Record Highest In past ½ Million Yrs
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4 EE243. Semiconductor Optoelectronic Devices (Winter 2010) Prof. J. S. Harris 7 US CO 2 Emissions 2005 Source: U.S. EPA Inventory of Greenhouse Gas Emissions, April 2007 EE243. Semiconductor Optoelectronic Devices (Winter 2010) Prof. J. S. Harris 8 World Energy Production Millions of Barrels per Day (Oil Equivalent) 300 200 100 0 1860 1900 1940 1980 2020 2060 2100 Source: John F. Bookout,“Two Centuries of Fossil Fuel Energy” International Geological Congress, Washington DC; July 10,1985. Episodes, vol 12, 257-262 (1989).
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5 EE243. Semiconductor Optoelectronic Devices (Winter 2010) Prof. J. S. Harris 9 165,000 TW of sunlight hit the earth Our Energy Challenge 2004 6.5 Billion People 14.5 Terawatts 2050 ~ 10 Billion People 30-60 Terawatts Need to convert 0.025 % of incident solar energy EE243. Semiconductor Optoelectronic Devices (Winter 2010) Prof. J. S. Harris 10 Electric Power Generation, by Source Solar is small - lots of room for growth 10 3 10 4 10 5 10 6 US Electricity Generation (GWh) 2004 2002 2000 1998 1996 1994 1992 Year Wind Geothermal Hydroelectric Natural Gas Nuclear Coal TOTAL Solar source of data: Energy Information Administration
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6 EE243. Semiconductor Optoelectronic Devices (Winter 2010) Prof. J. S. Harris 11 Overall Ranking Cleanest solutions to global warming, air pollution, energy security Electric power Vehicles 1. Wind 1. Wind-BEVs 2. CSP 2. Wind-HFCVs 3. Geothermal 3. CSP-BEVs 4. Tidal 4. Geothermal-BEVs 5. PV 5. Tidal-BEVs 6. Wave 6. PV-BEVs 7. Hydroelectricity
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Lecture_17 - Pizza Lunch for all Survivors CISX-Patio...

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