Download - Solar power ppt
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Solar Energy
ByArun. K
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Solar power:
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What is solar energy?
Radiant Energy
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Solar Energy – A Bright Idea!
“I’d put my money on the sun and solar energy. What a source of power! I hope we don’t have to wait ‘til oil and coal run out before we tackle that.” - EDISON
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People have been harnessing solar energy for a long time!
Solar collector for
heating water
A home in California in 1906
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Major Uses of Solar Energy Day lighting Drying Water Heating and cooking Photovoltaic In space
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Day lightin
g
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Drying
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Solar Cooking
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Benefits of solar cooking
Consumes no fuel/wood
No air pollution
No greenhouse gases
NO SMOKE
Eliminates fire danger
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More benefits of solar cooking
No daily search for firewood
Free time for other activities
Cooks food well
Easy to clean
Preserves nutrients
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Solar heating
Solar water heating is the most efficient and economical use of solar energy.
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How does it work?
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Benefits of solar heating:
No wastage of fuel
Pollution free
Heat large amount of water
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Solar Electric
(Photovoltaic)
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Solar electric systems
Photovoltaic converts Light energy into electrical energy.
PV represents one of the most promising means of maintaining our energy intensive standard of living while not contributing to global warming and pollution.
Smaller – CalculatorsLarger – Power plants
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How does it made?
• Two pieces of silicon
• N-layer gives electron
• P-layer is positively charged.
Silicon must be purified
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How does it work?
Sunlight is composed of photons. When they strike a PV cell, they may be reflected or absorbed. Only the absorbed photons generate electricity. When the photons are absorbed, the energy of the photons is transferred to electrons in the atoms of the solar cell.
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PV System Components
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Total PV Installation Worldwide
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Benefits of PV :
PV in remote areas
In our day-to-day life
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Advantages of Solar Energy
• Clean• Renewable• Free• Provide electricity to
remote places
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Disadvantages of Solar Energy
Costly equipment Part Time Reliability Depends On Location Current generated is DC Pollutable
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In Space
• Solar array used by the space shuttle to provide for power needs in outer space
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QUERIES