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Renewable Energy

Renewable Energy. Solar Hydro Wind Hydrogen Biomass Geothermal. Energy Efficiency. Percentage of energy input that does useful work in an energy conversion system Increasing energy efficiency of common devices has economic and environmental advantages Creating jobs, Saving money

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Renewable Energy

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  1. Renewable Energy Solar Hydro Wind Hydrogen Biomass Geothermal

  2. Energy Efficiency Percentage of energy input that does useful work in an energy conversion system Increasing energy efficiency of common devices has economic and environmental advantages Creating jobs, Saving money Reducing oil imports Prolonging fossil fuel supplies Reducing pollution and environmental degradation

  3. Flow of U.S. Commercial Energy

  4. Ways to improve Energy efficiency of Existing homes 1. adding insulation 2. plugging leaks 3. installing energy-saving windows 4. wrapping water heaters 5. installing tankless water heaters models 6. buying energy-efficient appliances and lights

  5. Solar Energy No Pollution Little maintenance Only ~0.05% of world’s electricity. So why do we not Use it more? NOT ENOUGH gov’t aid

  6. Solar- PV cells • Photovoltaic Cells commonly called solar cells • How do they work? • Sunlight energizes and causes the electrons in the semiconductors to flow creating an electrical current

  7. Solar NEW technology • Organic solar cells- carbon based polymers similar to teflon and can be applied to surfaces in layers. - converts 24-35% of suns rays into electricity • Can be printed on a sheet of paper, stuck onto your house

  8. Solar NEW technology 2. Nanosolar Cells Tiny rods of semiconductors Much thinner than a human hair Can be placed in plastic materials

  9. Suitability of Solar Usage best when more than 60% of daylight hours are sunny www.bio.miami.edu/beck/esc101/Chapter14&15.ppt

  10. Hydro • Indirect forms of RE • Pg 313

  11. WIND Indirect form of RE Since 1990 fastest form of RE Europe the leader ¾ of World’s wind power Denmark has banned coal and 90% of electricity from wind

  12. WIND / on page 397 • The Dept. of Energy calls the Great Plain States: OK, SD, ND,KA,NE, TX the Saudi Arabia of wind • Enough wind resources to meet nations needs • Need more tax breaks and govt subsidies • Wind power could produce about ¼ of the U.S. electricity by 2025

  13. Biomass • Plant material and animal wastes that can be directly burned into biofuels. 4 big types • Direct burning of wood or manure. Mostly used for cooking and heating homes. 30% in developing countries  10% efficient, produces CO2 figure 18-25

  14. Biomass 2. Gaseous Biofuels Biogas 60% Methane, 40% CO2 Comes from livestock waste and landfills AND with the bacteria and decomposition the Methane can used for electricity

  15. Biomass 3. Ethanol- made from Sugar cane or Corn • How made? Fermentation and distillation  increase corn prices for farmers and lots of energy used to created it so a huge NET loss of Energy BUT… Ethanol can be made from non-food crops, grasses and other fast growing trees. Ethanol production from cellulose http://www.youtube.com/watch?v=poTGr8ONgl0 http://www.youtube.com/watch?v=NR_3QZzqMKI

  16. Algae...next big biofuel • Algae make a lipid (oil) and the end of photosynthesis • After some refining…. • http://www.youtube.com/watch?v=vxNeBQCRv1c • http://www.youtube.com/watch?v=n9_-ZguuhBw&NR=1

  17. Geothermal Consists of heat stored in soil, underground rocks and fluids within the Earth’s mantle • Where? Throughout most of the world except the Tundra ~3m below the surface 50-60 F Geothermal Heat Pumps A system of pipes and ducts into ground to exchange hot or cold temps depending on the season. • http://www.youtube.com/watch?v=-ajqiPe_9Ko

  18. Geothermal What about for Electricity? Tap deeper and more concentrated areas Found almost anywhere…5-6 miles below HOT DRY ROCK ZONES -magma heats up subsurface rock to high temps. Water is added onto rocks, steam produced, turn turbines= electricity ALSO,http://www.youtube.com/watch?v=vSZ1dIBdOIs

  19. Geothermal • Currently 1% of world uses GeoT • In Iceland 85% of all bldgs use GeoT • San Francisco “the Geysers” the worlds larges GeoT systems utilizes 1.7 million homes. In the Mayacamas Mountains, located north of San Francisco,

  20. Hydrogen • http://www.youtube.com/watch?v=yowRvfFtMgQ&feature=related • http://www.youtube.com/watch?v=esuAlB4NVi0 Splitting water using ELECTROLYSIS under HIGH temps Problems 1. H locked in water and organic molecules like fossil fuels 2. Takes $ and energy to extract the hydrogen 3. Current fuel cell models are expensive

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