Sustainable Energy

  • Created by: Sharon
  • Created on: 09-04-15 14:03
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  • Sustainable Energy
    • Biomass
      • Burning of material such as fuel wood, plants, animals (biomass)  to release eneregy. (biofuels)
      • Advantage:  little technology need = good for underdeveloped countries.  Lower levels of pollution than fossil fuels.
      • Disadvantages: uses fossil fuels to transport biofuels, Smells.  Modern techniques need technology but underdeveloped countries can burn material to cook.
      • 1970 - Bioethanol in Brazil.  Fermenting cane sugar - decreased Brazil's dependence on oil.
    • Solar Power
      • Technologies: Solar water heaters, solar panels, solar cookers, PV cells
        • DISADVANTAGE:  Expensive to install.  Loss of landscape = habitat, loss of culture, increase congestion.  Need for sunny climate.
        • ADVANTAGE: Silent, Can create more energy than needed = boost whole economy
        • China - 99% of buildings have solar water heaters, 600K homes have solar cookers & street lights powered by PV cells.
    • Wind Power
      • Wind Turbines turn blades which convert wind energy to mechanical and then electical energy
        • Eg. Denmark - families offered tax exemption to generate own electricity
      • Large scale - wind farm - more economical.  On or offshore.  Goes to an electrical grid to transport energy
      • Small scale - connect to grid hut to supply one building
      • Advantage:  pollution free, renewable.  Denmark - families offered tax exception for generating own energy
    • Wave Energy
      • Wave power is the transport of energy by ocean surface waves. The sun heats the Earth's surface, the resulting temperature differences create winds and the wind blowing over ocean surfaces creates waves. A number of devices are being developed to convert wave energy into electrical energy
      • Advantages; Wind, sun & sea water is free. Not visually impairing.
      • Disadvantage; unreliable, costly (to build and maintain due to storm damage).  Negative environmental changes in tidal basins
    • Tidal Energy
      • Renewable energy created by turbines using the tidal movement.
        • 1967 RANCE, France.  Largest one
      • Advantages: Renewable, reliable, precidtable. Creates large amount of energy in comparison to power stations. Non-polluting.  Protects estuaries as erosion reduced behind barrage.
      • Disadvantage: cost to build and maintain.  Technology needs to be advanced = expensive.  Flooding of wetlands.  Adverse affect on aquatic life.
    • Appropriate Technologies
      • Using the most appropriate system according to a county's economic ability.
    • is defined as 'development that meets the needs of the present without conprimising the ability of future generations to meet thier needs


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