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How Wind Works | Wind Energy Foundation - 0 views

www.windenergyfoundation.org/...how-wind-works wind form
shared by dpurdy on 24 Mar 13 - No Cached
  • Wind is simply air in motion. It is caused by the uneven heating of the Earth's surface by the sun. Because the Earth's surface is made of very different types of land and water, it absorbs the sun's heat at different rates. One example of this uneven heating can be found in the daily wind cycle.
  • Mechanical or electrical power is created through the kinetic energy of the wind.
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WHTP Marine Hydrokinetic Technologies Database: Project Profile - 0 views

www1.eere.energy.gov/...GlobalProjectMap.aspx wave current
shared by dpurdy on 06 Apr 13 - No Cached
  • dpurdy on 06 Apr 13
     
    Current wave energy projects world wide.
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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 Hub wave energy hydropower infrastructure project on track for summer 2011 deploym... - 0 views

www.hydroworld.com/...wave-hub-wave-energy.html infrastructure wave
shared by dpurdy on 31 Oct 12 - No Cached
  • Hartlepool-based JDR Cable Systems is constructing the armored 25- kilometer subsea cable that will connect Wave Hub to the grid and the hub structure that will sit on the seabed. Work also is progressing on the hub assembly, which will provide a connection between the main cable from the shore and the tails leading to the wave energy devices.
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How much energy can a wind farm produce? - Curiosity - 0 views

curiosity.discovery.com/...energy-can-wind-farm-produce
shared by egglestonjoc98 on 22 Oct 12 - No Cached
  • At 1.8 megawatts, that turbine produces 5.2 million kilowatt-hours of electricity, enough power for 600 households. As more turbines are grouped together, they collect more energy from the available wind.
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Solar Power Frequently Asked Questions | Solar Energy World | MD, DC, NJ - 0 views

www.solareworld.com/...solar-faqs pollution
shared by lanebri99 on 22 Oct 12 - No Cached
  • lanebri99 on 22 Oct 12
     
    ". Solar energy reduces the amount of fossil fuel that is burned, thus reducing the pollutants and CO² that get into the atmosphere. "
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Group items tagged pollution - qmstech2 | Diigo Groups - 0 views

groups.diigo.com/...pollution location mrpurdy
shared by filionmar99 on 22 Oct 12 - No Cached
    • filionmar99
      filionmar99 on 22 Oct 12
       
      read this
  • The major challenge to using wind as a source of power is that it is intermittent and does not always blow when electricity is needed. Wind cannot be stored (although wind-generated electricity can be stored, if batteries are used), and not all winds can be harnessed to meet the timing of electricity demands. Further, good wind sites are often located in remote locations far from areas of electric power demand (such as cities).
  • Although wind power plants have relatively little impact on the environment compared to fossil fuel power plants, there is some concern over the noise produced by the rotor blades, aesthetic (visual) impacts, and birds and bats having been killed (avian/bat mortality) by flying into the rotors. Most of these problems have been resolved or greatly reduced through technological development or by properly siting wind plants.
  • ...1 more annotation...
  • A Renewable Non-Polluting Resource Wind energy is a free, renewable resource, so no matter how much is used today, there will still be the same supply in the future. Wind energy is also a source of clean, non-polluting, electricity. Unlike conventional power plants, wind plants emit no air pollutants or greenhouse gases. According to the U.S. Department of energy, in 1990, California's wind power plants offset the emission of more than 2.5 billion pounds of carbon dioxide, and 15 million pounds of other pollutants that would have otherwise been produced. It would take a forest of 90 million to 175 million trees to provide the same air quality.
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Group items matching "history geothermal" in title, tags, annotations or url - qmstech2... - 0 views

groups.diigo.com/...search
shared by jurektho99 on 22 Oct 12 - No Cached
  • The word geothermal comes from the Greek words geo (earth) and therme (heat). So, geothermal energy is heat from within the Earth. We can recover this heat as steam or hot water and use it to heat buildings or generate electricity. Geothermal energy is a renewable energy source because the heat is continuously produced inside the Earth. ... Cancel
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Energy waves lesson - 0 views

www.bitesizephysics.com/energywaveslesso.html wave energy from
shared by baileyamb99 on 22 Oct 12 - Cached
  • Here’s rule one when it comes to waves....the waves move, the particles don’t. The wave moves from place to place. The wave carries the energy from place to place.
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Wind Energy | Energy and Global Climate Change in New England | US EP - 0 views

www.epa.gov/...re_wind.html co2
shared by bannonmel99 on 22 Oct 12 - No Cached
  • Winds are caused by the interaction of the uneven heating of the atmosphere with the uneven surface of the earth, and the earth’s rotation
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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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Ocean Energy - 0 views

www.energy.ca.gov/...index.html wave form
shared by baileyamb99 on 22 Oct 12 - Cached
  • Wave energy conversion takes advantage of the ocean waves caused primarily by interaction of winds with the ocean surface
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Tidal Wave Energy - Quick Guide to Costs,Investment and How Tidal Generators Produce Ti... - 1 views

www.greenworldinvestor.com/...generators-produce-tidal-power tidal converted
shared by morehousejam98 on 22 Oct 12 - No Cached
  • .In this form of Tidal Power,a Barrage is built near the coast where water is collected during the periods of high tides.During low tide the barrage allows the water from the reservoir to move towards the ocean or sea.The potential energy of the water at a higher level is converted to electricity using Turbines.
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BBC NEWS | Technology | Wave farms show energy potential - 1 views

news.bbc.co.uk/...6410839.stm wave future change current
shared by logansar99 on 24 Oct 12 - Cached
  • Ocean waves carry tremendous power, and could, in theory at least, provide much of the world's electricity.
  • "What gives us tremendous hope with this technology is that our opening costs are substantially below where wind power started 20, 25 years ago."
  • Wind power has reduced its cost by 80% since, as the technology has been deployed and optimised, he says.
  • ...3 more annotations...
  • Ms Pontes says wave energy could someday supply 20% of Portugal's power.
  • "That's equal to about six-and-a-half percent of our total capacity in the United States, equal to all the dams that we have in the US right now."
  • The European Union has proposed a commitment to generate 20% of its energy from renewable sources by the year 2020.
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Pros & Cons of Wave Energy | eHow.com - 0 views

www.ehow.com/045_pros-cons-wave-energy.html pollution pros wave energy
shared by hughesacam99 on 23 Oct 12 - No Cached
  • Unlike fossil fuels, wave power doesn't cause air pollution.
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Why We Need Solar Power - 0 views

www.getmysolartoday.com/why-we-need-solar-power infrastructure
shared by ackleysam99 on 23 Oct 12 - No Cached
  • When we look at what is available today in solar equipment it has come a long way  but still needs a long way to go.
  • ater they installed a solar hot air collector; this unit worked awesome during the winter months. It would raise the temperature of the home to the mid 80’s during the winter if you continued to let it run.
  • Yet each year we are becoming more energy efficient. The growing problem that really disturbs me is that while I consume less energy then I did in previous years my energy bills continue to climb at a record pace.
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HowStuffWorks "How Fuel Cells Work" - 0 views

auto.howstuffworks.com/...fuel-cell.htm fuel cell sustainable
shared by Connor Wiggins on 15 Mar 12 - Cached
  • This initiative, supported by legislation in the Energy Policy Act of 2005 (EPACT 2005) and the Advanced Energy Initiative of 2006, aims to develop hydrogen, fuel cell and infrastructure technologies to make fuel-cell vehicles practical and cost-effective by 2020
  • Why are governments, private businesses and academic institutions collaborating to develop and produce them? Fuel cells generate electrical power quietly and efficiently, without pollution. Unlike power
  • that use fossil fuels, the by-products from an operating fuel cell are heat and water
  • ...5 more annotations...
  • With a fuel cell, chemicals constantly flow into the cell so it never goes dead -- as long as there is a flow of chemicals into the cell, the electricity flows out of the cell. Most fuel cells in use today use hydrogen and oxygen as the chemicals.
  • If you want to be technical about it, a fuel cell is an electrochemical energy conversion device. A fuel cell converts the chemicals hydrogen and oxygen into water, and in the process it produces electricity.
  • polymer electrolyte membrane fuel cells (PEMFC)
  • United States has dedicated more than one billion dollars to fuel cell research and development so far.So what exactly is a fuel cell,
  • With a fuel cell, chemicals constantly flow into the cell so it never goes dead -- as long as there is a flow of chemicals into the cell, the electricity flows out of the cell. Most fuel cells in use today use hydrogen and oxygen as the chemicals.
  • ricciardellinick on 08 Mar 13
     
    "In 2003, President Bush announced a program called the Hydrogen Fuel Initiative (HFI) during his State of the Union Address."
  • Connor Wiggins on 11 Mar 13
     
    It shows how its sustainable 
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Disadvantages of Wind Energy - Don't Get Blown Away by All The Positives of Wind - 2 views

www.alternative-energy-resources.net/advantages-of-wind-energy.html disadvantages turbines impact wind pollution cost location
shared by shannonlan97 on 15 Mar 12 - No Cached
  • 3.Wind Turbines Interfere with Television Reception.
  • Some of these blades can have a span of 100 or more feet.
  • birds easily fly into the blade path and get killed.
  • ...2 more annotations...
  • get about a hundred of these "bad boys" cranking out a few hundred RPM's and you might have the sound of an alien attack.
  • If you do live along the coast, your personal property is rather expensive and you might not be able to afford the opportunity to afford the land, let alone a wind generator.
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New Platinum Could Mean Cheaper, More Efficient Fuel Cells - 0 views

www.alternative-energy-news.info/aper-more-efficient-fuel-cells fuel cells hydrogen pollution
shared by bartontri97 on 13 Mar 12 - No Cached
  • Fuel cells are electrochemical devices that transform the chemical energy of a fuel into electricity generating water as a by-product.
  • Fuel cells use hydrogen and oxygen to complete their energy-producing reactions.
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