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RENEWABLE ENERGY - Coggle Diagram
RENEWABLE ENERGY
Hydroelectric
1)Currently largest source of electricity from
renewables .2)Needs guaranteed supply of water. 3)Kinetic energy of water rotates turbines which
generate electricity.
What is
hydropower?
Hydropower is a form
of energy created bythe force of the water
falling from a dam.
What happens
inside a hydroelectric
power plant?
1) Water falls from the resevoir into a penstock. 2) Flowing water spins a large turbine which activates a generator that produces electricity. 3) After passing through the turbine the water re-enters the river on the downstream side of the dam.
Advantages
It is reliable, efficent and does
not pollute the air
Disadvantages
1) Dams and basins have a great impact
on environment view. 2) High initial cost.
Wind Turbines
1) Each windturbine can produce between 1/4
and 2 MW (megawatt) of electrical power. 2) Windfarm needs to be located where there is a
relatively high average wind speed.
Advantages?
Advantages of windturbines is. 1) -Low maintenance needed. 2) -Very low noise pollution. 3) Can be located offshore. 4) -Can produce a lot of energy.
Disadvantages?
Disadvantages of windturbines is. 1) They have a great impact on
environment view if located onshore.
Offshore Wind
Cluster Features
1) Larger average wind speed than
onshore. 2) Easier planning consent (there
are no barriers). 3) Suitable location.
Wave Power
1) Land Installed. 2) Marine Powered. 3) Energy. 4)Transformer.
Wave power harnesses the energy of ocean surface waves. This energy is captured and used for electricity generation, water desalination, or for pumping water into reservoirs. Wave energy is difficult to control due to the unpredictability of the ocean and of wave direction.
What is reanwable energy?
Renewable energy is the one that is replaced over a reasonable period of time by natural processes.
What forms does it take?
Forms of renewable energy are wind,
hydroelectricity, geothermal energy,
solar energy and tidal energy.
Why is it needed?
Renewable energy can replace non-renewable energy saving earth from global warming and airpollution.
List of renewable resources
Wind, Wave and Hydro Power, Photovoltaics, Active Solar Heating, Municipal and General Wastes, Landfill Gas, Geothermal Agricultural and Forestry Wastes, Energy Crops and Fuel Cells.
Where do all the energy sources come from?
All sources of energy ultimately come from the
sun.
This is particularly obvious in the case of
renewable energies.
Solar radiation
1) Solar heating panels (for heating). 2) Solar power generation (for electricity). 3) solar cells / photovoltaic cells.
Solar panels
1) are situated on roof of building. 2)absorb heat in the form of radiation from sun.3) basically system is like a domestic central heating radiator painted black/insulated. 4) provides “topping up” of domestic hot water.
Solar cells
1)convert light into a small electrical output
-milliwatts output. 2) need a bank/array of cells for useful output. 3) cost of cells is high but reducing. 4) efficiency of cells is up to 23%/ improving.
Solar Power Generation
1) located in desert/high intensity/long sunlight
hours. 2) parabolic mirrors reflect/focus sun’s rays onto
metal water pipe located along focal axis of
mirrors. 3) High temperature produced - steam - electrical
power generated.
Tidal Power
1) Located at some coastal sites - usually
estuaries and bays with large tidal range. 2) Shape of coastal site above and below sea
level determines range. 3) At high tide reservoir of water is created which is allowed ebb through turbines
located in dam. 4) Expensive construction.
Biomass
1) cycle of sunlight - photosynthesis - plant growth -
absorption of CO2 - emission of O2. 2) combustion of wood - heat. 3) some plants - alcohol. 4) decomposition - methane/landfill gas/fuel for heating.