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Devices that Harness Wave Energy | Wave Energy Cost - 2 views

www.oceanenergycouncil.com/...Wave-Energy.html cost wave pollution
shared by tvedepai00 on 11 Mar 13 - Cached
  • Wave energy is an irregular and oscillating low-frequency energy source that can be converted to a 60-Hertz frequency
  • Kinetic energy, the energy of motion, in waves is tremendous. An average 4-foot, 10-second wave striking a coast puts out more than 35,000 horsepower per mile of coast.
  • It varies in intensity, but it is available twenty-four hours a day, 365 days a year.
  • ...9 more annotations...
  • Because wave energy needs only 1/200 the land area of wind and requires no access roads, infrastructure costs are less;
  • 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.
  • the sun shines, wave energy will never be depleted
  • As long as
  • produce energy at about 4.5 cents kWh.
  • 7.5 cents kWh
  • In comparison, electricity generated by large scale coal burning power plants costs about 2.6 cents per kilowatt-hour.
  • about 3 cents per kilowatt hour
  • Wave energy devices are quieter and much less visually obtrusive than wind devices
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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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The Benefits of Wind Power - Green Living Ideas - 0 views

greenlivingideas.com/...the-benefits-of-wind-power wind benefits
shared by jack wells on 11 Mar 13 - No Cached
  • One of the most important is that wind power is the least expensive of all other forms of alternative energy.
  • One of the most important is that wind power is the least expensive of all other forms of alternative energy. 
  • Another tremendous benefit of wind power is that it is a sustainable source of energy and a clean source of energy
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  • Wind energy is also a renewable energy, meaning it does not deplete our natural resources like coal or petroleum based products.
  • One of the most important is that wind power is the least expensive of all other forms of alternative energy.  Wind turbines generate electricity at around 5 cents per kWh (Kilowatt Hour), which is comparable to the new coal and/or oil burning power plants.  The costs are projected to decline even more as technology improves, and this is very important because most of the cost with wind power is in manufacturing.  Once the wind turbines are in place there is little cost to maintain and wind power is free.
  • jack wells on 11 Mar 13
     
    The benefits of wind energy.
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Generate Your Own Wind Energy - 0 views

www.sustainablestuff.co.uk/GenerateYourOwnWindEnergy.html wind energy cost pollution
shared by mcdermottaar99 on 11 Mar 13 - No Cached
  • As with installing your own solar energy, installing wind energy will help to reduce carbon emissions, which damage the environment and will save money.
  • It's only downfall is possibly the visual impact it makes on the landscape: A tall 'small scale' generator could attract wide rebuttal from neighbours, and this is worth considering before embarking on a wind generation project. However, if you live in a remote area, which benefits from exposure to the wind, or have neighbours that are happy for you to go ahead with the project, installing wind power can be an economically viable way to capitalise on natural, renewable resources
  • A wind generator will cost in the region of £3'000 - £15'000, at about £3'000 per kilowatt.
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  • You can expect a wind generator to pay for itself in little over five years, and with conventional energy prices soaring, the dividends will increase with time.
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How long has solar power been around? - Fort Smith Alternative Energy | Examiner.com - 0 views

www.examiner.com/...ng-has-solar-power-been-around solar history
shared by leonardsar99 on 11 Mar 13 - No Cached
  • Using the sun's power has been around as early as the 7th century B.C. when people were using it to build fires. It is hypothesized that in 2nd century B.C. Archimedes used the reflective surfaces of bronze shields to burn ships invading Syracuse. However, it was not until 1973 when the Greek navy actually experimented with the notion and successfully burned a wooden ship at 50 meters. Sunrooms were common in houses and public buildings in the 6th century A.D. These were so common that "sun rights" were given to individuals. Swiss scientist Horace de Saussure was credited with building the world’s first solar collector in 1767. For a more descriptive timeline, this timeline lists the milestones in the historical development of solar technology from the 7th century B.C. up to today.
  • Using the sun's power has been around as early as the 7th century B.C. when people were using it to build fires. It is hypothesized that in 2nd century B.C. Archimedes used the reflective surfaces of bronze shields to burn ships invading Syracuse. However, it was not until 1973 when the Greek navy actually experimented with the notion and successfully burned a wooden ship at 50 meters. Sunrooms were common in houses and public buildings in the 6th century A.D. These were so common that "sun rights" were given to individuals. Swiss scientist Horace de Saussure was credited with building the world’s first solar collector in 1767. For a more descriptive timeline, this timeline lists the milestones in the historical development of solar technology from the 7th century B.C. up to today.
  • whalenkil98 on 11 Mar 13
     
    how long has solar energy been around?
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World's fist commercial scale tidal energy generator nears completion - 0 views

www.gizmag.com/...9110 tide scale
shared by mchughkon99 on 11 Mar 13 - No Cached
  • April 4, 2008 Bristol based renewable energy company Marine Current Turbines has completed the first installation phase of the 1.2MW SeaGen Tidal System at Northern Ireland’s Strangford Lough - a site chosen for its combination of fast tidal current and ability to provide shelter from bad weather which may hinder the construction process.
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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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Where Does Solar Energy Come From - PV Gap - 0 views

www.pvgap.org/...es-solar-energy-come-from.html solar form
shared by kenyonlau99 on 08 Mar 13 - No Cached
  • Solar energy is energy from the sun, it is a renewable source of energy and does not cause pollution.
  • kenyonlau99 on 08 Mar 13
     
    where does solar/photovoltaic energy come from? answer above!
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Global Warming and Climate Change | Greenpeace - 0 views

www.greenpeace.org/...global-warming-and-energy geothermal solar wind history global warming climate change greenpeace
shared by bakereli00 on 08 Mar 13 - No Cached
  • Research has shown that with current technology, renewable energy sources like wind, solar, and geo-thermal can provide almost all of our primary energy demand.
  • brownale99 on 08 Mar 13
     
    "The Solutions With current technology, renewable energy sources like wind, solar, and geothermal can provide 96% of our electricity and 98% of our total heating demand - accounting for almost all of our primary energy demand."
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Where does Wind Energy Come From? - 1 views

www.motiva.fi/...index.htm wind history
shared by aaronschr00 on 08 Mar 13 - No Cached
  • All renewable energy (except tidal and geothermal power), and even the energy in fossil fuels, ultimately comes from the sun. The sun radiates 174,423,000,000,000 kilowatt hours of energy to the earth per hour.
  • The sun radiates 174,423,000,000,000 kilowatt hours of energy to the earth per hour.
  • freeberntay99 on 08 Mar 13
     
    " Where does Wind Energy come From? All renewable energy (except tidal and geothermal power), and even the energy in fossil fuels, ultimately comes from the sun. The sun radiates 174,423,000,000,000 kilowatt hours of energy to the earth per hour. In other words, the earth receives 1.74 x 10 17 watts of power . 1) About 1 to 2 per cent of the energy coming from the sun is converted into wind energy. That is about 50 to 100 times more than the energy converted into biomass by all plants on earth. 2)"
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Wind Power - What is Wind Power and How Does It Work? - 0 views

environment.about.com/...wind_power.htm wind form
shared by wellsann99 on 11 Mar 13 - Cached
  • wind power as a better way to generate electricity than plants fueled by coal, hydro (water) or nuclear power.
  • willisjos98 on 11 Mar 13
     
    "Wind power is actually a form of solar power, because wind is caused by heat from the sun. Solar radiation heats every part of the Earth's surface, but not evenly or at the same speed. Different surfaces-sand, water, stone and various types of soil-absorb, retain, reflect and release heat at different rates, and the Earth generally gets warmer during daylight hours and cooler at night. As a result, the air above the Earth's surface also warms and cools at different rates. Hot air rises, reducing the atmospheric pressure near the Earth's surface, which draws in cooler air to replace it. That movement of air is what we call wind."
  • wellsann99 on 11 Mar 13
     
    what is wind power
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Tidal power - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/...Tidal_power tide form
shared by lemairenat98 on 11 Mar 13 - No Cached
  • Tidal stream generators (or TSGs) make use of the kinetic energy of moving water to power turbines, in a similar way to wind turbines that use wind to power turbines. Some tidal generators can be built into the structures of existing bridges, involving virtually no aesthetic problems. [edit] Tidal barrage
  • lemairenat98 on 11 Mar 13
     
    "Tidal stream generator Main article: Tidal stream generator Tidal stream generators (or TSGs) make use of the kinetic energy of moving water to power turbines, in a similar way to wind turbines that use wind to power turbines. Some tidal generators can be built into the structures of existing bridges, involving virtually no aesthetic problems."
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Tidal Power - Generating electricity from tidal currents - 1 views

www.alternative-energy-news.info/...tidal-power tide energy
shared by rascoekat00 on 11 Mar 13 - No Cached
  • Tidal energy is produced through the use of tidal energy generators. These large underwater turbines are placed in areas with high tidal movements, and are designed to capture the kinetic motion of the ebbing and surging of ocean tides in order to produce electricity. Tidal power has great potential for future power and electricity generation because of the massive size of the oceans. These articles explore the potential energy of tidal power technologies.
  • We can use slow moving ocean and river waves for a new, reliable and affordable alternative energy source. A University of Michigan engineer has developed a device that acts like a fish that turns the potentially destructive vibrations in water into clean, renewable energy.
  • It will generate one of the most environmentally-friendly forms of energy - it makes no noise
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  • "But if we could harness 0.1 percent of the energy in the ocean, we could support the energy needs of 15 billion people
  • Tidal energy is produced through the use of tidal energy generators. These large underwater turbines are placed in areas with high tidal movements
  • Xin Wang on 11 Mar 13
     
    This is how tidal energy is converted into useful form of power. 
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Tidal Power | BC Sustainable Energy Association - 1 views

www.bcsea.org/...tidal-power tide cost
shared by lemairenat98 on 11 Mar 13 - No Cached
  • However, estuaries are among the world’s most productive and sensitive ecosystems, and barrages cause large disruptions to their natural processes. We will therefore not further consider barrage based tidal power as a truly sustainable energy resource.
  • While there are non-tidal based ocean currents such as the Gulf Stream, those are usually too diffuse to be a practical energy source. The tides cause water to flow inwards from the ocean twice a day during flood tides, and outwards during ebb tides. Additional monthly and annual cycles vary the strength of this current on a monthly and annual basis. Narrow and shallow constrictions produce the fastest and most powerful movements, whose energy can be captured using submerged turbines.
  • BC Hydro’s 2002 Green Energy Study for BC estimated the realistic energy potential for tidal current energy generation in BC to be 20 TWhrs/year. The estimated cost was 11 cents/kWhr for a large (800 MW) site, and 25 cents/kWhr for a small (43 MW) site. The best sites are in the Strait of Georgia and Johnstone Strait, which are both relatively close to the main centers of consumption.
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  • The second type is based on utilizing the fast-flowing marine currents caused by tidal action. While there are non-tidal based ocean currents such as the Gulf Stream, those are usually too diffuse to be a practical energy source. The tides cause water to flow inwards from the ocean twice a day during flood tides, and outwards during ebb tides.
  • Nevertheless, it is a truly sustainable energy source which is also very predictable. It is not subject to the vagaries of weather or climate change, and while the energy varies, it follows a predictable pattern that is known many years in advance.
  • mchughkon99 on 11 Mar 13
     
    oceanic tides 
  • murphymat98 on 11 Mar 13
     
    The second type is based on utilizing the fast-flowing marine currents caused by tidal action....it is a truly sustainable energy source which is also very predictable. It is not subject to the vagaries of weather or climate change, and while the energy varies, it follows a predictable pattern that is known many years in advance.
  • lemairenat98 on 15 Mar 13
     
    " costs are expected to fall to between 5 and 7 cents/kWhr."
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fuel cell - Google Search - 0 views

www.diigo.com/...byg8
shared by conboyeri98 on 11 Mar 13 - No Cached
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