Unit 3; Energy & Env Pollution; Renewable Resources & Secondary Fuels
- Created by: Former Member
- Created on: 06-02-17 09:06
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- 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
- Needs
- 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
- Types:
- 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
- Factors affecting ease of use
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