Unit 3; Energy & Env Pollution; Renewable Resources & Secondary Fuels

View mindmap
  • Renewable Resources & Secondary Fuels
    • Factors affecting ease of use
      • Intermittance: not constantly available, hard to supply demand
      • Unreliability: availability is unpredictable
      • Energy density: lower than fossil fuels
      • Ease of storage: surplus can't be stored for all resources
      • Environmental Impact: all have some impact but not as much as fossil fuels
    • Solar Energy
      • not suitable for high latitudes due to seasonal fluctuations
      • cloud cover makes it intermittant
      • effective equipment
        • hot water panels
        • matt black surfaces
        • thermostatically operated pump
        • large south facing windows
        • heliostats rotate to face sun
        • parabolic reflectors focus sunlight onto a collector
    • Wind Power
      • good for uplands, plains and coastal areas
      • unreliable due to wind change
      • require open land but can be used in farmlands
      • can cause visual intrusion, noise, bird strikes, radio interferance
      • more efficient if helical shape
    • Hydroelectric Power
      • Needs
        • regular precipitation
        • large catchment area
        • impermeable rock
        • stable geology
      • Good for peak shaving
        • 2 reservoirs, in times of surplus, water pumped to top reservoir & allowed to fall down in shortage tiimes
    • Tidal Power
      • needs suitable coastal shape to concentrate flow
      • must have large tidal range
      • in stream turbines reduce negative impacts
      • barrages with turbines for 1 way flow
    • Geothermal Power
      • water pipes through natural hot rock to warm water
      • tech efficiency is increasing
      • few places can do this e.g. iceland
      • low enviro impact
    • Biofuels
      • Types:
        • crop/sewage waste materials
        • energy crops; wood/veggie oils
      • can be stored and supply rate controleld
      • needs large area, conflict with food crop growth
    • Secondary Fuels
      • from primary resources e.g. HEP: solar>PE>KE>Electricity
      • Methods to generate electricity
        • kinetic energy; generators
        • light energy; photovoltaic cells
        • chemical energy; fuel cells
      • Hydrogen Production
        • from water electrolysis
        • allows conversion of extra energy
        • storage methods not fully developed


No comments have yet been made

Similar Environmental Science/Studies resources:

See all Environmental Science/Studies resources »See all Energy resources »