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The Energy Story - Chapter 15: Solar Energy - 1 views

www.energyquest.ca.gov/...chapter15.html solar convert
shared by leonardsar99 on 11 Mar 13 - Cached
  • We have always used the energy of the sun as far back as humans have existed on this planet. As far back as 5,000 years ago, people "worshipped" the sun. Ra, the sun-god, who was considered the first king of Egypt.
  • We have always used the energy of the sun as far back as humans have existed on this planet. As far back as 5,000 years ago, people "worshipped" the sun.
  • Ra, the sun-god, who was considered the first king of Egypt
  • ...1 more annotation...
  • When sunlight strikes the solar cell, electrons (red circles) are knocked loose. They move toward the treated front surface (dark blue color). An electron imbalance is created between the front and back. When the two surfaces are joined by a connector, like a wire, a current of electricity occurs between the negative and positive sides. These individual solar cells are arranged together in a PV module and the modules are grouped together in an array. Some of the arrays are set on special tracking devices to follow sunlight all day long.
  • butlerlex99 on 11 Mar 13
     
    the sun
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tidal energy - National Geographic Education - 0 views

education.nationalgeographic.com/...tidal-energy current tide
shared by butlerlei98 on 11 Mar 13 - No Cached
  • Tidal energy is produced by the surge of ocean waters during the rise and fall of tides.
  • During the 20th century, engineers developed ways to use tidal movement to generate electricity in areas where there is a significant tidal range—the difference in area between high tide and low tide. All methods use special generators to convert tidal energy into electricity.
  • For most tidal energy generators, turbines are placed in tidal streams. A tidal stream is a fast-flowing body of water created by tides. A turbine is a machine that takes energy from a flow of fluid.
  • ...1 more annotation...
  • The world's first tidal power station was constructed in 2007 at Strangford Lough in Northern Ireland. The turbines are placed in a narrow strait between the Strangford Lough inlet and the Irish Sea. The tide can move at 4 meters (13 feet) per second across the strait.
  • butlerlei98 on 11 Mar 13
     
    ". The United States has no tidal plants and only a few sites where tidal energy could be produced at a reasonable price."
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Tidal stream power - Simple English Wikipedia, the free encyclopedia - 0 views

simple.wikipedia.org/...Tidal_stream_power tide convert
shared by lemairenat98 on 11 Mar 13 - No Cached
  • Tidal stream systems need to be located in areas with fast currents where natural flows are concentrated between obstructions, for example at the entrances to bays and rivers, around rocky points, headlands, or between islands or other land masses.
  • lemairenat98 on 11 Mar 13
     
    "Tidal stream systems need to be located in areas with fast currents where natural flows are concentrated between obstructions, for example at the entrances to bays and rivers, around rocky points, headlands, or between islands or other land masses."
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HowStuffWorks "How Can We Use Geothermal Energy?" - 0 views

science.howstuffworks.com/...geothermal-energy1.htm geothermal convert
shared by dpurdy on 19 Mar 13 - No Cached
  • Dry steam plants. Hot steam is piped directly from geothermal reservoirs into generators in the power plant. The steam spins turbines, which generate electricity.
  • dpurdy on 19 Mar 13
     
    "Dry steam plants. Hot steam is piped directly from geothermal reservoirs into generators in the power plant. The steam spins turbines, which generate electricity."
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What Is Biodiesel - 0 views

www.esru.strath.ac.uk/...what_biodiesel.htm biofuel convert
shared by dpurdy on 19 Mar 13 - Cached
  • The Transesterification process is the reaction of a triglyceride (fat/oil) with an alcohol to form esters and glycerol
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Where is tidal power being used to generate electricity - 0 views

wiki.answers.com/...g_used_to_generate_electricity tide power convert electricity
shared by rascoekat00 on 19 Mar 13 - No Cached
  • Barrage systems. This system, built like a dam across a river, holds back the water till the tide has gone out, then uses the potential energy of the water to turn turbines in the barrage. This is an expensive system with many disadvantages.
  • Tidal Stream systems. This consists of using turbines, rather like wind turbines, to use the kinetic power of the moving water to generate electricity. This is easier and cheaper to install.
  • There are three Barrage systems operating throughout the world. One large 240 MW plant on the Rance River in France, and two small plants, one in the Bay of Fundy in Canada, and another in Kislaya Guba in Russia.
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Discovery Kids :: Tell Me - How does a generator work? - 0 views

kids.discovery.com/...how-does-a-generator-work fossil fuels convert fossil
shared by dpurdy on 19 Mar 13 - No Cached
  • . It does this by using a magnet that forces electrons to move along a wire at a steady rate while putting pressure on them.
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Biofuel Guide - Introduction to Ethanol and Biodiesel - 0 views

biofuelguide.net biofuel convert form cost
shared by dpurdy on 19 Mar 13 - Cached
  • First generation biofuel are those fuel derived from vegetable or animal fats/oils, starch or sugar with the use of modern technology.
    • dpurdy
      dpurdy on 19 Mar 13
       
      Gallons per acre In the perspective of land use and agricultural efficiency, ethanol seems to be a good choice. The reason is that about 420 gallons of ethanol can be generated per acre in contrast to 60 gallons of biodiesel per acre soybeans. Consequently, the cost of soybean oil would significantly increase if biodiesel production is increased as well.
  • 1. Let the base organic material (corn, sugarcane, wheat, etc) pass through a grinding meal to pulverize the selected material. 2. Then, liquefy it by placing the blend of water, grain powder and an enzyme that facilitates the breakdown of the grain compound into a high-heat cooker. 3. Cool it afterwards. Add another enzyme that will facilitate the conversion of starch into sugars which are then fermented, producing alcohol from the cooled mash. 4. Start the fermentation by adding yeast to the sugar mixture. The sugars will be broken down to ethanol (a form of alcohol) and carbon dioxide. 5. Distill the fermented mixture in order for the ethanol to separate from the solids. 6. Get rid of the water from the separated ethanol through a dehydration process.
  • dpurdy on 19 Mar 13
     
    "Cellulose ethanol production is newly discovered experimental processes which can breakdown cellulose in woody fibers. This would only mean that through this method, ethanol from crop wastes, trees and grasses can be derived. It is significantly better since trees and grasses require small amount of energy in comparison to grains that must be replanted annually. "
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The Biofuels FAQs: The Facts About Biofuels: Biodiesel - 0 views

www.energyfuturecoalition.org/...fact_biodiesel.htm biofuel cost
shared by dpurdy on 19 Mar 13 - No Cached
  • Biodiesel from soybeans costs an estimated $2 to $2.50 per gallon to produce. Biodiesel from yellow grease is about $1 a gallon cheaper, but the available supply in the U.S. is much smaller – enough to make 100 million gallons per year. Producers of biodiesel from pure vegetable oil are eligible for a federal excise tax credit of $1 for every gallon blended with conventional diesel. Biodiesel from used cooking oil earns a credit of 50 cents per gallon.
  • Another promising technology captures smokestack emissions of carbon dioxide for use in an “algae farm,” where the gas stimulates the rapid growth of algae that can be converted into biodiesel and ethanol.
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How Do PV Solar Panels Work - Solar - 0 views

www.reuk.co.uk/ow-Do-PV-Solar-Panels-Work.htm convert
shared by coreyemi99 on 20 Mar 13 - No Cached
  • When a visible light photon strikes a solar cell it can do one of three things: pass straight through, be reflected, or be absorbed. If the photon is absorbed, its energy is absorbed by an electron in an atom of the solar cell enabling it to escape from its normal position (photon excitation), cross the junction and fill a hole. Since electrons are physically moving across the PN junction, the positive charge carrying holes are effectively moving in the opposite direction around the load circuit (a rechargeable battery or light bulb etc). This completes the circuit providing more holes for the electrons to combine with and providing usable electricity.
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How does an electrical generator work? - 0 views

www.sommersgen.com/...about-generators.php convert
shared by dpurdy on 25 Mar 13 - No Cached
  • Electric generators are essentially coils of electric conductors, usually copper wire, that are tightly wound onto a metal core and are mounted to spin around inside an array of large magnets
  • the copper conductor can spin at very high speeds through the magnetic field, producing a powerful flow of electricity. The same principle applies whether the generator is driven by a bicycle wheel, a tractor engine or a steam turbine.
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Explainer: what are biofuels? | Biofuels | SBS World News - 0 views

www.sbs.com.au/...Explainer-what-are-biofuels biofuel form
shared by dpurdy on 06 Apr 13 - No Cached
  • The biofuel industry takes the chemical energy contained in organic materials and converts this into useful energy sources. However, it is not necessarily a sustainable industry. Daniel Tan explains.
  • dpurdy on 06 Apr 13
     
    Explanation of the form of bio fuels.
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The hidden costs of fossil fuels - and biofuels, too - CSMonitor.com - 1 views

www.csmonitor.com/...-fossil-fuels-and-biofuels-too fossil fuels pollution cost biofuel
shared by dpurdy on 06 Apr 13 - No Cached
  • Climate considerations aside, damages wrought by ethanol made from corn were usually similar to, or even slightly worse, than damages from gasoline. That’s because of the extra energy needed to convert corn to biofuel.
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How Does Tidal Energy Work - 0 views

oilprice.com/...ow-Does-Tidal-Energy-Work.html tide convert
shared by mannixjul00 on 03 Nov 12 - No Cached
  • Tidal turbines use similar technology to wind turbines, although their blades are much shorter and stronger. So a good way to think of them is as underwater windmills. Basically the water currents turn the turbines, which in turn activate a generator that produces electricity. These systems work best where there are very strong tidal zones (Norwegian and British coastlines.) and although it is still in it’s infancy it does show great promise.The upfront cost of these tidal stream systems is very high and also installation and maintenance is difficult.
  • dpurdy on 03 Nov 12
     
    "Tidal turbines use similar technology to wind turbines, although their blades are much shorter and stronger. So a good way to think of them is as underwater windmills. Basically the water currents turn the turbines, which in turn activate a generator that produces electricity. These systems work best where there are very strong tidal zones (Norwegian and British coastlines.) and although it is still in it's infancy it does show great promise. The upfront cost of these tidal stream systems is very high and also installation and maintenance is difficult."
2More

How Does Tidal Power Work? - Energy Informative - 1 views

energyinformative.org/how-does-tidal-power-work tidal potential
shared by dpurdy on 03 Nov 12 - No Cached
  • 450 TWh is the estimated yearly potential of electric power that can be produced from tidal energy. In addition to this comes a large and not yet estimated potential in river flows.
  • Tidal stream generators are very similar to wind turbines except their below the water surface instead of above or on land. The turbine and generator converts the movement of water coming from change in tide, the kinetic energy, into electricity. Water is 830 times denser than air and therefore can generate electricity at lower speeds than wind turbines.
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Wave power conversion systems for electrical energy production | Leonardo ENERGY - 1 views

www.leonardo-energy.org/s-electrical-energy-production wave convert
shared by dpurdy on 30 Oct 12 - No Cached
  • Sea waves have associated a form of renewable energy which can be captured by using a hydro mechanical device that in turn drives an electrical generator to produce electrical energy.
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Wave & Tidal Energy Technology | Renewable Northwest Project - 0 views

www.rnp.org/...wave-tidal-energy-technology wave current
shared by sopranodan99 on 22 Oct 12 - No Cached
  • Potential
  • Wave energy resources are best between 30º and 60º latitude in both hemispheres, and the potential tends to be the greatest on western coasts
  • While no commercial wave or tidal projects have yet been developed in the United States, several projects are planned for the near future, including projects in the Northwest
  • ...7 more annotations...
  • ‘Pelamis’ wave energy conversion devices and generates a combined 2.25 MW of electricity. OPD plans to expand the facility to produce 22.5 MW in 2007
  • The United States receives 2,100 terawatt-hours of incident wave energy along its coastlines each year, and tapping just one quarter of this potential could produce as much energy as the entire U.S. hydropower system.
  • Total Annual U.S. Incident Wave Energy 2,110 terrawatt-hours
  • The United States receives 2,100 terawatt-hours of incident wave energy along its coastlines each year, and tapping just one quarter of this potential could produce as much energy as the entire U.S. hydropower system
  • In addition to its abundant solar, wind and geothermal resources, the Pacific Northwest is also uniquely situated to capture the renewable energy of the ocean. Special buoys, turbines, and other technologies can capture the power of waves and tides and convert it into clean, pollution-free electricity. Like other renewable resources, both wave and tidal energy are variable in nature. Waves are produced by winds blowing across the surface of the ocean. However, because waves travel across the ocean, their arrival time at the wave power facility may be more predictable than wind. In contrast, tidal energy, which is driven by the gravitational pull of the moon and sun, is predictable centuries in advance.
  • The United States receives 2,100 terawatt-hours of incident wave energy along its coastlines each year, and tapping just one quarter of this potential could produce as much energy as the entire U.S. hydropower system
  • The Unit
  • mchughkon99 on 15 Mar 13
     
    the amount of 1/4 of energy around the coasts could be equal to the amount energy produced by hydropower
1More

Tidal Power - 0 views

www.enviropedia.org.uk/...Tidal_Power.php tidal converted
shared by morehousejam98 on 22 Oct 12 - No Cached
  • A dam-like structure is constructed across an estuary to trap a high tide of water and then let it pass through turbines to generate electricity. The water flow can generate electricity on the falling tide only, or on the falling and rising tide.
1More

How Is Wave Energy Used to Generate Electricity? | eHow.com - 0 views

www.ehow.com/sed-generate-electricity_.html converted
shared by baileyamb99 on 22 Oct 12 - No Cached
  • Earth is composed mainly of bodies of water---about 71 percent of the earth's surface is water. Ninety-seven percent of that is found in the oceans. Because the earth's surface is curved, the sun heats it unevenly. This causes winds to blow across the water and generate waves. The sun and moon also exert their gravitational pull on the earth, triggering wave-producing tides. Wave motion energy can be harnessed and generated into electricity.
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