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dpurdy

OWECO By Others - 1 views

www.owec.com/byOTHERS.html

wave form

shared by dpurdy on 03 Nov 11 - No Cached
  • ocean waves is long considered substantive kinetic resource
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dpurdy

EIA Energy Kids - Hydropower - 1 views

www.eia.gov/...energy.cfm

what how location

shared by dpurdy on 03 Nov 11 - No Cached
  • Tides are caused by the gravitational pull of the moon and sun, and the rotation of the Earth. Near shore, water levels can vary up to 40 feet due to tides. Dam of the Tidal Power Plant on the Estuary of the Rance River, Bretagne, France Source: Stock photography (copyrighted) Tidal power is more predictable than wind energy and solar power. A large enough tidal range — 10 feet — is needed to produce tidal energy economically.
  • The United States has no tidal plants and only a few sites where tidal energy could be produced economically. France, England, Canada, and Russia have much more potential to use this type of energy.
  • Tidal turbines are basically wind turbines in the water that can be located anywhere there is strong tidal flow. Because water is about 800 times denser than air, tidal turbines have to be much sturdier than wind turbines. Tidal turbines are heavier and more expensive to build but capture more energy.
  • ...2 more annotations...
  • Waves are caused by the wind blowing over the surface of the ocean. There is tremendous energy in the ocean waves. It's estimated that the total potential off the coasts of the United States is 252 billion kilowatthours a year, about 6% of the United States' electricity consumption in 2010. The west coasts of the United States and Europe and the coasts of Japan and New Zealand are good sites for harnessing wave energy.
  • Many more ways to capture wave energy are currently under development. Some of these devices being developed are placed underwater, anchored to the ocean floor, while others ride on top of the waves. The world's first commercial wave farm using one such technology opened in 2008 at the Aguçadora Wave Park in Portugal.
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dpurdy

RenewableUK - Where Does Tidal Energy Come From? - 0 views

www.bwea.com/tides.html

what Tide

shared by dpurdy on 03 Nov 11 - No Cached
  • Where Does Tidal Energy Come From? The gravitational force of the Earth stops the ocean from floating off into space, just like everything else. The Moon also has a very weak gravitational effect on the Earth, which is not normally noticable as far as falling teacups are concerned, but the ocean, which can flow around the globe to even out differences, is noticably affected.
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dpurdy

Biofuel crops may worsen global warming: study - CTV News - 0 views

www.ctv.ca/...biofuel_crops_080209

global warming

shared by dpurdy on 03 Nov 11 - No Cached
  • "Our study found that any biofuel that causes clearing of natural ecosystems will increase global warming," Joe Fargione, a scientist for The Nature Conservancy, told CTV.ca.
  • He said converting natural areas into croplands results in tons of carbon being emitted into the atmosphere -- a carbon 'debt' that outweighs any benefits.
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dpurdy

Biomass Energy Home Page Biomass Energy: Cost of Production - 0 views

www.oregon.gov/...Cost.shtml

cost

shared by dpurdy on 03 Nov 11 - No Cached
  • The cost of producing ethanol varies with the cost of the feedstock used and the scale of production. Approximately 85 percent of ethanol production capacity in the United States relies on corn feedstock. The cost of producing ethanol from corn is estimated to be about $1.10 per gallon.
  • Because a gallon of ethanol contains less energy than a gallon of gasoline, the production cost of ethanol must be multiplied by a factor of 1.5 to make an energy-cost comparison with gasoline. This means that if ethanol costs $1.10 per gallon to produce, then the effective cost per gallon to equal the energy contained in a gallon of gasoline is $1.65. In contrast, the current wholesale price of gasoline is about 90 cents per gallon.
  • A major hurdle facing commercial biodiesel production is the cost of producing the fuel. Vegetable oil seed procurement, transport, storage and oil extraction accounts for at least 75 percent of the cost of producing biodiesel. The cost varies depending on the feedstock used. For example, based on the market price for industrial rapeseed grown in Washington and Idaho, the estimated cost of producing biodiesel is $2.56 per gallon of rapeseed methyl ester. Recent estimates put the cost of production in the range of $1.30 per gallon (using waste grease feedstock) to $2.00 or more per gallon using soybean oil.
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dpurdy

Customer Feedback for Diigo - 1 views

feedback.diigo.com/...76211-ideas

shared by dpurdy on 02 Nov 11 - No Cached
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sokolkyl00

Using solar panels helps prevent global warming - 0 views

www.naturalnews.com/021676_solar_power_panels.html

solar co2

shared by sokolkyl00 on 27 Sep 13 - No Cached
  • By powering your house with solar panels instead of using nonrenewable sources, you could help fight global warming.
sokolkyl00

Solar Power Energy Information, Solar Power Energy Facts - National Geographic - 0 views

environment.nationalgeographic.com/...solar-power-profile

solar co2

shared by sokolkyl00 on 29 Oct 12 - No Cached
  • Every hour the sun beams onto Earth more than enough energy to satisfy global energy needs for an entire year. Solar energy is the technology used to harness the sun's energy and make it useable. Today, the technology produces less than one tenth of one percent of global energy demand.
  • In one technique, long troughs of U-shaped mirrors focus sunlight on a pipe of oil that runs through the middle. The hot oil then boils water for electricity generation. Another technique uses moveable mirrors to focus the sun's rays on a collector tower, where a receiver sits. Molten salt flowing through the receiver is heated to run a generator.
  • Despite the drawbacks, solar energy use has surged at about 20 percent a year over the past 15 years, thanks to rapidly falling prices and gains in efficiency. Japan, Germany, and the United States are major markets for solar cells. With tax incentives, solar electricity can often pay for itself in five to ten years.
  • ...1 more annotation...
  • Solar energy is lauded as an inexhaustible fuel source that is pollution and often noise free. The technology is also versatile.
  • valentivin99 on 29 Oct 12
     
    " Today, the technology produces less than one tenth of one percent of global energy demand."
  • kennedyeri98 on 11 Mar 13
     
    Intriguing facts about the suns energy on how they use it on oil and the drawback 
  • bondycal00 on 26 Sep 13
     
    Every hour the sun beams onto Earth more than enough energy to satisfy global energy needs for an entire year. Solar energy is the technology used to harness the sun's energy and make it useable. Today, the technology produces less than one tenth of one percent of global energy demand.
mannixjul00

DOE - Fossil Energy: A Brief History of Coal Use in the United States - 1 views

www.fossil.energy.gov/...coal_history.html

fossil fuels history

shared by mannixjul00 on 27 Sep 13 - No Cached
  • Archeologists have also found evidence that the Romans in England used it in the second and third centuries (100-200 AD). 
  • In the 1700s, the English found that coal could produce a fuel that burned cleaner and hotter than wood charcoal.
bishophan00

Wind Energy America - FAQs - 1 views

www.windenergyamerica.com/faqs.html

wind

shared by bishophan00 on 19 Mar 12 - No Cached
  • Simply put, an average one megawatt wind turbine will produce enough energy for the annual needs of 350 average households. The amount of energy produced by a turbine varies depending on several factors, namely the size and reliability of the turbine, and the speed that the wind is blowing. These factors together produce the turbine’s capacity. Typically modern turbines range in size from 660 kilowatts to over 3 megawatts of capacity. They are placed in fairly windy locations with minimum wind speeds in the range of six meters per second (around 13 miles per hour). Wind turbines generally run at 30 to 40 percent capacity, so a 1 MW turbine could produce around 3 million KWh of electricity in a year.
  • , wind energy could provide 20% of America’s electricity.
  • According to the American Wind Energy Association, the total U.S. production of wind power is around 25 gigawatts
  • freeberntay99 on 08 Mar 13
     
    "Simply put, an average one megawatt wind turbine will produce enough energy for the annual needs of 350 average households. The amount of energy produced by a turbine varies depending on several factors, namely the size and reliability of the turbine, and the speed that the wind is blowing. These factors together produce the turbine's capacity. Typically modern turbines range in size from 660 kilowatts to over 3 megawatts of capacity. They are placed in fairly windy locations with minimum wind speeds in the range of six meters per second (around 13 miles per hour). Wind turbines generally run at 30 to 40 percent capacity, so a 1 MW turbine could produce around 3 million KWh of electricity in a year."
  • ...2 more comments...
  • wellsann99 on 12 Mar 13
     
    today's wind power
  • kurishkri00 on 24 Sep 13
     
    How much wind power is currently being produced in the United States? According to the American Wind Energy Association, the total U.S. production of wind power is around 25 gigawatts. New wind projects made up 42% of the U.S.'s total new power-producing capacity constructed in 2008, adding 8.4GW of new facilities into the grid.
  • kurishkri00 on 26 Sep 13
     
    What is wind power? Wind power is the result of using the wind to generate electricity. In the past windmills were used to grind grain or pump water. Today, a large wind turbine can power all the electricity needs of at least 350 homes.
  • bishophan00 on 27 Sep 13
     
    , wind energy could provide 20% of America's electricity. Today's wind turbines are very different from the windmills of the past. Moder
schmettererdav00

http://www.howstuffworks.com/fuel-efficiency/biofuels/10-advantages-of-biofuels.htm - 0 views

www.howstuffworks.com/...10-advantages-of-biofuels.htm

cost biofuel

shared by schmettererdav00 on 27 Sep 13 - No Cached
  • As gas prices rise and global warming becomes more pervasive, more people are using biofuels as a way to save money and decrease their consumption of fossil fuels.
schmettererdav00

Advantages and Disadvantages of Biofuels - 0 views

greenliving.lovetoknow.com/_and_Disadvantages_of_Biofuels

biofuel cost

shared by schmettererdav00 on 30 Oct 12 - Cached
  • Biofuels have the potential to be significantly less expensive than gasoline and other fossil fuels. This is particularly true as worldwide demand for oil increases, oil supplies dwindle, and more sources of biofuels become apparent.
  • schmettererdav00 on 27 Sep 13
     
    Biofuels have the potential to be significantly less expensive than gasoline and other fossil fuels. This is particularly true as worldwide demand for oil increases, oil supplies dwindle, and more sources of biofuels become apparent.
charlesjos00

How Long Has Solar Power Been Around? | eHow - 1 views

www.ehow.com/_long-solar-power-around_.html

solar history

shared by charlesjos00 on 13 Mar 13 - No Cached
  • August Mouchout is credited with the creation of the first active solar motor. In 1861, he developed a steam engine fueled completely by the sun.
  • kenyonlau99 on 13 Mar 13
     
    "Ever since ancient Romans installed glass and mica around their southern-facing door entrances, people have been finding ways to harness the power of the sun. From those origins, solar energy has slowly progressed into a viable source for powering your home. Other People Are Reading"
crandallmad00

Energy Resources: Tidal power - 0 views

www.darvill.clara.net/...tidal.htm

tide wave

shared by crandallmad00 on 11 Mar 13 - Cached
  • A huge dam (called a "barrage") is built across a river estuary. When the tide goes in and out, the water flows through tunnels in the dam. The ebb and flow of the tides can be used to turn a turbine, or it can be used to push air through a pipe, which then turns a turbine. Large lock gates, like the ones used on canals, allow ships to pass. If one was built across the Severn Estuary, the tides at Weston-super-Mare would not go out nearly as far - there'd be water to play in for most of the time. But the Severn Estuary carries sewage and other wastes from many places (e.g. Bristol & Gloucester) out to sea. A tidal barrage would mean that this stuff would hang around Weston-super-Mare an awful lot longer! Also, if you're one of the 80,000+ birds that feeds on the exposed mud flats when the tide goes out, then you have a problem, because the tide won't be going out properly any more.
charlesjos00

How Solar Works in 4 Steps « Energy4Home - 0 views

blogs.constellation.com/...how-solar-works-in-4-steps

solar steps convert

shared by charlesjos00 on 27 Sep 13 - No Cached
  • 1) Individual silicon based (most commonly) cells called photovoltaics (PV) make up the modern day solar panel. These PV cell clusters perform the task of converting incoming sunlight directly into electricity. 2) Wires attached to the panels transport the converted electricity to a piece of equipment called an inverter. The job of the inverter is to convert the solar generated Direct Current (DC) electricity into the type of power your home can use, which is called Alternating Current (AC). 3) After the electricity travels through the inverter, the AC electricity is then transported via wire to your breaker panel to meet your home’s electric demands. 4) The process doesn’t end there, though. There are times when your panels will generate more power than you consume and times when you aren’t generating enough electricity (night times and periods of low light). When your panels are not generating enough solar electricity, you will continue to get power from your local utility. However, when you’re generating a surplus of solar electricity, that excess clean energy will be “net metered” to your local utility grid and you may earn a credit on your power bill for that net metered electricity.
crandallmad00

What are the advantages and disadvantages of renewable tidal power - 0 views

wiki.answers.com/...tages_of_renewable_tidal_power

tide wave

shared by crandallmad00 on 27 Sep 13 - No Cached
  • trictly, tidal power comes from the mov
  • crandallmad00 on 27 Sep 13
     
    Strictly, tidal power comes from the movement of the tides, and wave power comes from the movement of the waves. There are two kinds of tidal power stations: Tidal stream systems, which use turbines turned by the moving water to generate electricity. Very like wind power. Barrage systems. These are like dams built across rivers. After the tide comes in, the gates are closed. When the tide is low enough on the downstream side, the water flows through turbines rather like a hydro-electric dam. Wave power consists of harnessing the movement of the waves. There are various pilot schemes of this at the moment.
bondycal00

Solar power - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/Solar_power

solar pollution cost co2 sustainable convert history form current

shared by bondycal00 on 20 Sep 13 - Cached
  • The Life-cycle greenhouse-gas emissions of solar power are in the range of 22 to 46  g/kWh depending on if solar thermal or solar PV is being analyzed, respectively. With this potentially being decreased to 15 g/kWh in the future.[71] For comparison (of weighted averages), a combined cycle gas-fired power plant emits some 400-599 g/kWh,
  • bondycal00 on 26 Sep 13
     
    Solar power is the conversion of sunlight into electricity, either directly using photovoltaics (PV), or indirectly using concentrated solar power (CSP). Concentrated solar power systems use lenses or mirrors and tracking systems to focus a large area of sunlight into a small beam. Photovoltaics convert light into electric current using the photoelectric effect.
kurishkri00

Wind Energy - 0 views

www.conserve-energy-future.com/Wind_Into_Energy.php

wind convert

shared by kurishkri00 on 23 Sep 13 - No Cached
  • The wind turns the blades, which spin a shaft connected to the generator and produces electricity. Turbine blades are designed in such a way that wind causes them to rotate, which rotates the shaft at low speed, with a gear at the end that itself is connected to small gear on high speed shaft that runs through alternator housing.
  • he generator produces electricity using the same principle as a generator of your car (depending on the turbine). Magnetic Rotor inside the generator on high speed shaft spins inside loops of copper wire that are wound around an iron core. The rotor creates “electromagnetic induction” as it spins around the inside of the core through the coils, which generates electrical power. The current is regulated and transmission network (or home network system connection), after some changes, so it can use in our homes or sent to a battery bank for storage.
  • kurishkri00 on 26 Sep 13
     
    Most wind turbines turn in the moving air like blades of propeller aircraft and supply power to an electric generator that produces electricity. Wind turbines, rather than working as a fan in your house that uses electricity to generate wind, use wind power to generate electricity. - See more at: http://www.conserve-energy-future.com/Wind_Into_Energy.php#sthash.MFQJ5BOI.dpuf
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