Alternative Energy Sources Solar Wind Sea. Solar Energy.
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Transcript of Alternative Energy Sources Solar Wind Sea. Solar Energy.
Alternative Energy Sources
Solar
Wind
Sea
Solar Energy
1888 – Solar Powered Printing Press
The sun’s energy boils water, producing steam that drives the steam engine.
Solar PanelsSolar PanelsA combination of magnifying glasses and fluid-filled pipes
The glass front focuses the sun’s power on the pipes behind it
Pipes are painted black to absorb sun.
Fluid in the pipes heats up
Silver reflective surface reflects sunlight back
The heat is used to heat up a tank of water….
A Basic Heat ExchangerA Basic Heat Exchanger
The fluid-filled pipe enters the water tank and coils around.
The heat from the pipes is transferred to the water in the tank
Solar Water Heating SystemSolar Water Heating System
Sun’s rays pass through glass panel, warming fluid inside the pipes.
The pipes run through the water tank
Parabolic Solar CollectorsParabolic Solar Collectors
Unusually shaped mirrors (parabolic) focus the sun’s heat on the pipe
The hot fluid in the pipe can be used, through a system of heat The hot fluid in the pipe can be used, through a system of heat exchangers, to produce electricity or hot waterexchangers, to produce electricity or hot water
Parabolic Solar Collectors
Solar Powered CarsSolar Powered Cars
Vikings probably travelled as far as North America, all through the use of wind power.
Over 1500 years ago, the Chinese had large sailing vessels and travelled as far as Africa.
History of Wind PowerHistory of Wind Power
Persia 500 BC
Sails were used to drive a mill stone for grinding grain
1000 AD – Wind powered devices became more powerful1000 AD – Wind powered devices became more powerfulYou can still find similar devices in Cyprus and the Greek Islands for You can still find similar devices in Cyprus and the Greek Islands for pumping water for livestock.pumping water for livestock.
With the development of electricity, scientists and technologists With the development of electricity, scientists and technologists developed ways of producing electricity through wind generators developed ways of producing electricity through wind generators (turbines)(turbines)
1960s, a German Technologist designed wind generators that used 1960s, a German Technologist designed wind generators that used modern materials such as fibreglass and types of plastics. The modern materials such as fibreglass and types of plastics. The lighter materials meant that the device could operate in lighter lighter materials meant that the device could operate in lighter winds, generating electricity. Slowly but surely, wind powered winds, generating electricity. Slowly but surely, wind powered turbines were beginning to look economic to build and maintain.turbines were beginning to look economic to build and maintain.
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1970’s – 80’s1970’s – 80’sA rapid rise in oil prices led to greater development of wind generators A rapid rise in oil prices led to greater development of wind generators (turbines). (turbines).
Recognized the need for alternative forms of energy Recognized the need for alternative forms of energy
Greater understanding that using fossil fuels causes pollution that Greater understanding that using fossil fuels causes pollution that damages the environment and causes global warming.damages the environment and causes global warming.
Some modern designs are shown below. They are built from composite Some modern designs are shown below. They are built from composite materials that are light and very strong.materials that are light and very strong.
Sea PowerSea Power
Waves
Tides
Currents
TidesTides
WavesWaves
Hydroelectricity