Renewable energy resources

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  • What is nuclear energy? In a nuclear fission reaction, neutrons split the nuclei of atoms such as uranium-235 and plutonium-239. In the process, energy (primarily in the form of high temperature heat) is released. In a nuclear reactor, the production of heat generated by this reaction is controlled and used to produce high pressure steam, which is in turn used to spin turbines that generate electricity. Nuclear fission is basically the splitting of nuclei of certain isotopes with large mass numbers. Neutrons are fired at them, which causes them to split into lighter nuclei and to release single neutrons and energy. These single neutrons can in turn cause additional fission, but there has be enough single neutrons (critical mass) in order for the reaction to sustain itself. If controllable, nuclear power can be an efficient source of power, but large government subsidies distort the true price of nuclear and the disposal of nuclear waste has proven to be an environmentalists nightmare. Disasters on the global scale, such as Chernobyl and Three Mile Island, also highlight the risk of this type of energy source.
  • What is nuclear energy? In a nuclear fission reaction, neutrons split the nuclei of atoms such as uranium-235 and plutonium-239. In the process, energy (primarily in the form of high temperature heat) is released. In a nuclear reactor, the production of heat generated by this reaction is controlled and used to produce high pressure steam, which is in turn used to spin turbines that generate electricity. Nuclear fission is basically the splitting of nuclei of certain isotopes with large mass numbers. Neutrons are fired at them, which causes them to split into lighter nuclei and to release single neutrons and energy. These single neutrons can in turn cause additional fission, but there has be enough single neutrons (critical mass) in order for the reaction to sustain itself. If controllable, nuclear power can be an efficient source of power, but large government subsidies distort the true price of nuclear and the disposal of nuclear waste has proven to be an environmentalists nightmare. Disasters on the global scale, such as Chernobyl and Three Mile Island, also highlight the risk of this type of energy source.
  • Renewable energy resources

    1. 1. RENEWABLE ENERGY RESOURCES BY MANIMARAN S I ANATHARAMAN
    2. 2. contents• Types of sources• Solar power• Hydro power• Wind power• Biomass• Solar-hydrogen• Geothermal• sustainable energy• conclusion
    3. 3. Renewable Energy Resources!• Biomass• Hydroelectric power• Geothermal• Solar—passive and active• Wind generation• Hydrogen power
    4. 4. Using Solar Energy to Provide Heatand Electricity Passive solar heating Active solar heating
    5. 5. Using Solar Energy to Provide High-Temperature Heat and Electricity Solar Cell Trade-Offs Solar thermal systems Photovoltaic (PV) cells
    6. 6. Producing Electricity fromMoving Water  Large-scale hydropower  Small-scale hydropower 50% of West Coast electricity 7% of US electricity 20% of World’s electricity Major environmental impacts High construction costs
    7. 7. Impacts of hydropower on salmonand other riverine spp. Pollution Disruption of water flow Loss of biodiversity Invasive species
    8. 8. Impacts of hydropower onSpecies and People_______________Dams can provide many human benefits but:• Disrupts ecological services rivers provide; e.g. 119 dams on Columbia River have caused a 94% drop in wild salmon; removing hydroelectric dams will restore native spawning grounds• Displaces millions of people worldwide as reservoirs flood traditional homelands• No room for expansion in the US
    9. 9. Producing Electricity from Wind
    10. 10. Producing Energy from Biomass Biofuels Biomass plantations Crop residues Animal manure Biogas Ethanol Methanol
    11. 11. The Solar-Hydrogen Revolution Extracting hydrogen efficiently Storing hydroge Fuel cells
    12. 12. Geothermal Energy Geothermal reservoirs Dry steam Wet steam Hot water Molten rock Hot dry-rock zones
    13. 13. Geothermal Reservoirs
    14. 14. Creating a Sustainable Energy Future • Increase fuel efficiency standards for vehicle, appliances, buildings • Tax and other financial incentives for energy efficiency • Subsidize renewable energy use, research and development • Internalize externalities for fossil fuels • By 2050: – Increase renewable energy to 50% – cut coal use by 50% – phase out nuclear altogether
    15. 15. Solutions:A Sustainable Energy Strategy
    16. 16. conclusionThus we see about the renewable energy sources , it’s types ,applications , merits and demerits
    17. 17. Any queries ?
    18. 18. Thank you

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