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tidal energy steps to electricity - Google Search - 1 views

www.google.com/webhp history tide
shared by butlerlei98 on 11 Mar 13 - No Cached
  • butlerlei98 on 11 Mar 13
     
    "Mills using tidal power can be dated back to 12th century Europe, a technology that followed colonists to the Americas."
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Where does wind energy come from? - Alternative Energy - 0 views

alternative-earth.blogspot.com/...oes-wind-energy-come-from.html wind convert form
shared by hertznerkar00 on 11 Mar 13 - No Cached
  • Most of the wind energy produced  for power needs comes from wind farms, great big windmill type contraptions produce electricity because as the wind blows it turns the blades on a shaft, which powers a generator.
  • Wind energy is mechanical energy, the rotating movement of the blades of the windmill produces electricity through a generator. The wind is formed by the heating and cooling effects of the suns rays, the air rotates in high and low pressure which generates wind. Depending  on the type of wind pressure that is generated,whether it is a cool breeze on your face, different capacity of the strength of wind is formed in different parts of the world, this power goes to producing an effective source of untapped energy, for use by us in the form of heating and lighting.
  • Most of the wind energy produced  for power needs comes from wind farms, great big windmill type contraptions produce electricity because as the wind blows it turns the blades on a shaft, which powers a generator.
  • ...2 more annotations...
  • Most of the wind energy produced  for power needs comes from wind farms, great big windmill type contraptions produce electricity because as the wind blows it turns the blades on a shaft, which powers a generator.
  • Wind Power is usually split into two types, offshore and land based operations.
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Biofuel Facts - 0 views

environment.nationalgeographic.com/...biofuel-profile sustainable biofuel
shared by schmettererdav00 on 11 Mar 13 - No Cached
  • Much of the gasoline in the United States is blended with a biofuel—ethanol. This is the same stuff as in alcoholic drinks, except that it's made from corn that has been heavily processed. There are various ways of making biofuels, but they generally use chemical reactions, fermentation, and heat to break down the starches, sugars, and other molecules in plants. The leftover products are then refined to produce a fuel that cars can use.
  • schmettererdav00 on 20 Sep 13
     
    On the face of it, biofuels look like a great solution. Cars are a major source of atmospheric carbon dioxide, the main greenhouse gas that causes global warming. But since plants absorb carbon dioxide as they grow, crops grown for biofuels should suck up about as much carbon dioxide as comes out of the tailpipes of cars that burn these fuels. And unlike underground oil reserves, biofuels are a renewable resource since we can always grow more crops to turn into fuel.
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What is the sustainability of solar energy? - Yahoo! Answers - 2 views

answers.yahoo.com/...index solar energy yahoo answers sustainable
shared by dextereli99 on 11 Mar 13 - No Cached
  • The will burn for billions of years, it won't run out any time soon. This is sustainable because it will not deplete in the near future. The harder question is if the materials that go into a solar cell are sustainable. They use primarily silicon, which is one of the most abundant materials on earth. But they can also use other things, like metals (copper, silver, gold), and some toxic chemicals (arsenic, cadmium) etc. The sustainability of these materials is questionable. These materials are recyclable, and it is thought 99% of a solar cell can be recycled. But the production of them does has some toxic site affects, which means we have to balance the 'clean' energy production of the cells with the bad by products of their manufacturing process.
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How does tidal energy generate electricity - 0 views

wiki.answers.com/...al_energy_generate_electricity convert
shared by adamsaub98 on 11 Mar 13 - No Cached
  • Tidal BarragesA tidal barrage is basically a huge dam that is built across a river or estuary. Tunnels are built throughout the dam, and when the tide rises and falls it turns a turbine that generates power. Tidal FencesTidal fences are giant turnstiles that have vertical axis turbines mounted on a fence. The water passes through the fence and powers the turbines. Tidal TurbinesTidal turbines are the latest water power technology used in tidal areas. They look like wind turbines that are lined together underwater. They are used to capture strong tidal flows, so they have to be built extra strong.
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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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Wind - 0 views

www.esru.strath.ac.uk/...wind.htm
shared by stewartlas97 on 13 Mar 13 - No Cached
  • stewartlas97 on 13 Mar 13
     
    "This movement is complicated by several other factors that means wind does not always flow from the equator in the direction of either pole. The rotation of the earth creates a force known as the Coriolis force and this factor along with the temperature differences create winds at high altitudes above the earth on a large scale. These Geostrophic winds play a part in the wind's that affect us in everyday life, but local winds are largely affected by the surface of the earth - which is neither uniform or smooth. The earth has large flat plains (desert regions), areas covered with plant life (rainforests), very uneven regions (mountain ranges) and very smooth regions (seas and oceans), all of which affect the wind near the surface of the earth to varying degrees. These areas of the earth all have different values of roughness, which can impeded the flow of air. Obviously the lower the value of roughness the less the air is impeded."
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First Tidal Power in U.S. Starts Flowing to the Grid - IEEE Spectrum - 0 views

spectrum.ieee.org/...wer-starts-flowing-to-the-grid tide current
shared by dpurdy on 19 Mar 13 - No Cached
  • An offshore turbine is finally spinning in the United States!
  • 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
  • dpurdy on 19 Mar 13
     
    The ONLY tidal power plant connected to the grid in the US is online.
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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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Ocean Wave Energy Power Technology - History - 0 views

clean-future.com/...wave-power
shared by westkea00 on 06 Apr 13 - No Cached
  • Currently, numerous wave power plants (so called wave farms) have been implemented throughout the world. Many different organizations have designed various wave power systems that differ in size, cost, and effectiveness. A wave farm is a collection of wave power systems in order to create mass quantities of power. One example of a wave power plant is the Aguçadoura Wave Farm in Portugal from Pelamis Wave Power Ltd. It is the first wave farm ever established and produces 2.25 megawatts of power. It was completed in 2008. Other wave farms, with other companies involved, have been proposed.
  • In contrast to tidal power, ocean wave energy plants do not make use of the energy difference between high tide and low tide, but generating energy from continuous wave motion. So, wave energy generation is the conversion of the forces from the motion of waves into usable energy.
  • Wave energy is considered a form of hydropower, although it is the wind blowing over the surface of the ocean causing waves. So in many ways, wave energy is also wind energy - with all the pros and cons.
  • ...3 more annotations...
  • Wave energy is about using the energy of ocean waves for producing electrical current. It is a renewable energy resource and often confused with Tidal Power.
  • Wave power generation has been tested over the past century as an alternative energy source to fossil fuels to create electrical power, sea water desalinization, and reservoir pumping. Unfortunately, despite of all examinations and tests, the price for generating energy from ocean waves is still about twice as high as that of wind energy. Companies involved in wave energy generation hope to be able to cut 50% of the costs within the next couple of years.
  • During the 1970's gasoline crisis, wave power was pushed in order to be a good long term energy solution. Later, the energy crisis was resolved yet the leaps and bounds made in the innovation of wave power remained. Though there were not many wave power plants actually implemented, it has proven to be a benefit to modern resolutions with current power crises. Fuel prices are rising exponentially and the greenhouse effect is having potentially disastrous effects on the environment. There has never been more need for alternatives to fossil generated energy.
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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."
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MIT's artificial leaf is ten times more efficient than the real thing (Wired UK) - 0 views

www.wired.co.uk/...artificial-leaf solar hydrogen how sustainable
shared by dpurdy on 24 Oct 12 - No Cached
  • The device is an advanced solar cell, no bigger than a typical playing card, which is left floating in a pool of water. Then, much like a natural leaf, it uses sunlight to split the water into its two core components, oxygen and hydrogen, which are stored in a fuel cell to be used when producing electricity.
  • dpurdy on 24 Oct 12
     
    This is an amazing breakthrough in developing hydrogen.
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RimLife Green Teknologi LLC - Heavy Solar and Green Technologies - 0 views

www.rimlifegreentech.com/iesel_production_logistics.htm biofuel technologies
shared by morrisseygra99 on 22 Oct 12 - No Cached
  • Biodiesel is considered a non-flammable and non-combustible product.
  • Optimally, dedicated biodiesel tanker trucks and associated transfer components should be used to transport biodiesel. If non-dedicated equipment is used, it must be washed, rinsed, drained and dried prior to biodiesel loading in order to avoid any cross-contamination.
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Research Report: what are the best uses for solar power - 1 views

ultimate-research-assistant.com/ResearchReport.asp use
shared by troisichr99 on 22 Oct 12 - No Cached
  • A quick search on TreeHugger shows that ' solar power ' most often occurs in connection with producing electricity and only secondarily in connection with solar water heaters
  • Compared to electrically heated Water , Solar Water Heating is 57% of the internal rate of return, the scientists found
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EIA Renewable Energy-" Renewable Energy Consumption and Electricity Preliminary 2006 St... - 1 views

www.eia.gov/...rea_prereport.html wave current
shared by logansar99 on 22 Oct 12 - No Cached
    • logansar99
      logansar99 on 24 Oct 12
       
      Wave energy isn't on this chart, so it's mainly experimental.
  • logansar99 on 22 Oct 12
     
    There is a graphic that shows we don't use much wave energy it's mainly experimental.
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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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Group items matching "hydrogen potential" in title, tags, annotations or url - qmstech2... - 0 views

groups.diigo.com/...search fuel cells potential
shared by carrowluk99 on 24 Oct 12 - No Cached
  • carrowluk99 on 24 Oct 12
     
    if we fix our problems with price and how we make it hydrogen, we have the potential to generate all of our electrical need using fuel cells 
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