solar energy: an overview kenneth m. klemow, ph.d. wilkes university
TRANSCRIPT
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Solar Energy: An Overview
Kenneth M. Klemow, Ph.D.Wilkes University
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Points to be covered
Energetics of sunlight at the earth’s surface Direct uses of solar energy Types of solar electrical generation Current levels of solar electrical generation
capacity worldwide and US. Benefits of solar power generation Disadvantages of solar
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http://www.physicalgeography.net/fundamentals/7f.html
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Solar energy vs. demand
Total available 3850 ZJ
Worldwide energy consumption
0.50 ZJ
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Solar energy is used in two ways
Electrical generationElectrical generation
http://static.flickr.com/28/95708914_9c915fb6f1.jpg
DirectDirect
www.bestbuypoolsupply.com
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Direct uses of solar energy
© 2000 Geothermal Education Officewww.greatbuildings.com/www.urbanoptions.org/RenewableEnergy
Home heating
www.cookwiththesun.com
Cooking Lighting
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Types of solar electrical generation
www.renewableenergyaccess.com
Concentrating solar thermal (CST)
Photovoltaic (PV)
greenoptions.com
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Photovoltaic cell
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Forms of solar thermal electrical generationConcentrating Solar Power Tower
www.trec-uk.org.uk
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Forms of solar thermal electrical generation
Solar parabolic collectors
www.trec-uk.org.uk
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Solar powered transportation
Zephyr - solar airplane
www.treehugger.com
www.dur.ac.uk/dusc
Solar powered car from Durham University
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Solar Thermal vs PV Advantages for thermal
– No need to generate electricity– Higher efficiency / energy density– Can last for decades
Disadvantages for thermal– High weight associated with water– Freezing water expand, can burst pipes– Minor failure can totally destroy system– Pose hazards to migratory birds
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© 2000 Geothermal Education Office
Global Solar Thermal Capacity
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© 2000 Geothermal Education Office
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Trends in Global PV Solar
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US Solar PV Energy Capacity
http://thinkprogress.org/wp-content/uploads/2013/03/Solar-industry-growth.png
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Benefits of solar power Renewable and sustainable Generally quiet to operate Conserves fossil fuels Can be implemented remotely Can be scaled from tiny applications
(solar calculators) to very large (solar powered communities)
Can prevent pollution caused by fossil fuels
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Comparative life-cycle CO2 emissions
Energy source CO2 / kWe
Coal 1.4 – 3.6
Natural gas 0.6 – 2.0
PV solar 0.07 – 0.18
Thermal solar 0.08 – 0.20http://www.ucsusa.org/clean_energy/our-energy-choices/renewable-energy/environmental-impacts-solar-power.html
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Existing and potential solar energy development
> 1 million Americans use solar water heaters
> 200,000 homes use photovoltaic systems.
Enough electrical power could be generated in 100 m2 area of desert southwest to supply US energy needs.
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Drawbacks to solar power Heavy investment. High-latitude areas receive relatively little sunshine. Solar unreliable at night, during winter, and during
cloudy periods. Storage difficult; relies on batteries that may leak
chemicals. Some PV cells use heavy metals - toxic and difficult
to recycle. Solar farms require much land, currently between 5
and 10 acres / megawatt.