or now, the best wave generator technology in place in the United Kingdom is producing energy at an average projected/assessed cost of 7.5 cents kWh. In comparison, electricity generated by large scale coal burning power plants costs about 2.6 cents per kilowatt-hour.
Contents contributed and discussions participated by dpurdy
Fuel Cell - 3 views
A Basic Overview of Fuel Cell Technology - 0 views
Biofuel Guide - Introduction to Ethanol and Biodiesel - 0 views
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First generation biofuel are those fuel derived from vegetable or animal fats/oils, starch or sugar with the use of modern technology.
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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.
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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.
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"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. "
Biodiesel Performance, Costs, and Use - 0 views
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Unless soybean oil prices decline dramatically, it does not appear that biodiesel can be produced in large quantities at a cost that is competitive with petroleum diesel
The Biofuels FAQs: The Facts About Biofuels: Biodiesel - 0 views
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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.
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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.
HowStuffWorks "Mechanics of Hand-powered Generators" - 1 views
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A generator is basically an electric motor working in reverse.
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By spinning a coil of wire around a magnet, he found that he could create a steady current. Thus, he could convert energy used to spin the coil into electrical energy.
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This principle powers generators that run on gasoline or diesel fuel, as well as the massive turbines in modern power plants, where the coils are turned by falling water or steam generated by burning coal or igniting nuclear reactions.
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How a generator works
Discovery Kids :: Tell Me - How does a generator work? - 0 views
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. It does this by using a magnet that forces electrons to move along a wire at a steady rate while putting pressure on them.
Where is tidal power being used to generate electricity - 0 views
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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.
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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.
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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.
First Tidal Power in U.S. Starts Flowing to the Grid - IEEE Spectrum - 0 views
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An offshore turbine is finally spinning in the United States!
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Bay of Fundy, off the Maine coast. The TidGen has a peak power output of 180 kilowatts, enough to power around 25 to 30 homes
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The ONLY tidal power plant connected to the grid in the US is online.
How do fossil fuels cause pollution - 1 views
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"Fossil fuels, even when burned perfectly (natural gas, or methane, burns the best) release carbon dioxide which is a greenhouse gas causing dangerous global warming. Most fossil fuels also release smoke (leading to smog), and they may also release sulfur oxides and nitrogen oxides which contribute to acid rain."
What makes geothermal energy clean? - Curiosity - 0 views
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The water that creates the energy ultimately returns to the Earth, where it can be used again.
What Is Biodiesel - 0 views
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The Transesterification process is the reaction of a triglyceride (fat/oil) with an alcohol to form esters and glycerol
Transesterification - Definition, Glossary, Details - Oilgae - 0 views
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The main reaction for converting oil to biodiesel is called transesterification.
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The transesterification process reacts an alcohol (like methanol) with the triglyceride oils contained in vegetable oils, animal fats, or recycled greases, forming fatty acid alkyl esters (biodiesel)
HowStuffWorks "How Can We Use Geothermal Energy?" - 0 views
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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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"Dry steam plants. Hot steam is piped directly from geothermal reservoirs into generators in the power plant. The steam spins turbines, which generate electricity."
How do Photovoltaics Work? - NASA Science - 1 views
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Photovoltaics is the direct conversion of light into electricity at the atomic level. Some materials exhibit a property known as the photoelectric effect that causes them to absorb photons of light and release electrons. When these free electrons are captured, an electric current results that can be used as electricity.
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When light energy strikes the solar cell, electrons are knocked loose from the atoms in the semiconductor material. If electrical conductors are attached to the positive and negative sides, forming an electrical circuit, the electrons can be captured in the form of an electric current -- that is, electricity. This electricity can then be used to power a load, such as a light or a tool.
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"The photoelectric effect was first noted by a French physicist, Edmund Bequerel, in 1839, who found that certain materials would produce small amounts of electric current when exposed to light. In 1905, Albert Einstein described the nature of light and the photoelectric effect on which photovoltaic technology is based, for which he later won a Nobel prize in physics. The first photovoltaic module was built by Bell Laboratories in 1954. It was billed as a solar battery and was mostly just a curiosity as it was too expensive to gain widespread use. In the 1960s, the space industry began to make the first serious use of the technology to provide power aboard spacecraft. Through the space programs, the technology advanced, its reliability was established, and the cost began to decline. During the energy crisis in the 1970s, photovoltaic technology gained recognition as a source of power for non-space applications."
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