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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
  • anonymous on 28 Sep 13
     
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careyeth99

Fuel Cells & Hydrogen | Fuel Cells 2000 - 0 views

www.fuelcells.org/fuel-cells-and-hydrogen

fuel cells hydrogen fuel cell

shared by careyeth99 on 13 Mar 13 - No Cached
  • careyeth99 on 13 Mar 13
     
    A fuel cell is an electrochemical device that combines hydrogen and oxygen to produce electricity, with water and heat as its by-product.
sokolkyl00

Solar power - Sustainable green energy to protect our economy and environment | PARTHA ... - 2 views

saferenvironment.wordpress.com/...ct-our-economy-and-environment

solar sustainable

shared by sokolkyl00 on 11 Mar 13 - No Cached
  • A Solar Energy system can operate entirely independently, not requiring a connection to a power or gas grid at all. Systems can therefore be installed in remote locations, making it more practical and cost-effective than the supply of utility electricity to a new site.
  • A Solar Energy system can operate entirely independently, not requiring a connection to a power or gas grid at all. Systems can therefore be installed in remote locations, making it more practical and cost-effective than the supply of utility electricity to a new site.
  • bolendev99 on 11 Mar 13
     
    "It offers much more self-reliance than depending upon a power utility for all electricity."
dittrichcai99

AE Kids : Geothermal Energy - 0 views

www.alliantenergykids.com/...022401

geothermal

shared by dittrichcai99 on 11 Mar 13 - No Cached
  • o" means "from the earth," and "thermal" means "heat," so this type of energy is found under
  • dittrichcai99 on 11 Mar 13
     
    "A geothermal heating system uses pipes buried more than four feet deep in the earth. That is another reason why it's important for adults to call 811 before they dig in their yard so they don't hit buried piping. The system pumps a liquid through the pipes to absorb the heat and brings it back indoors. A device called a "heat exchanger" takes the heat from the liquid and uses it to heat the air inside the home."
glinbizzivic98

Pros and Cons of Geothermal Energy - 0 views

www.energy-consumers-edge.com/cons_of_geothermal_energy.html

geothermal cost

shared by glinbizzivic98 on 12 Mar 13 - No Cached
  • glinbizzivic98 on 12 Mar 13
     
    "You can drill a hole just about anywhere to get this abundant, high temperature geothermal energy, but the hole would be miles deep, and dry. It is possible to use that heat resource, but terribly expensive, and drilling is just the beginning of the expensive engineering problems of utilizing extremely deep geothermal energy resources."
conboyeri98

DOE - Fossil Energy: Current Technology for Producing Hydrogen - 0 views

www.fossil.energy.gov/...currenttechnology.html

shared by conboyeri98 on 12 Mar 13 - No Cached
  • Today, most hydrogen in the United States, and about half of the world's hydrogen supply, is produced through the steam reforming of natural gas. The U.S. demand for hydrogen currently is about 9 million tons per year. Of this amount, about 1.5 million tons is merchant hydrogen production that is sold to refineries and chemical plants. In refineries, hydrogen is produced as a by-product of naphtha reforming, and any supplemental hydrogen is produced from steam reforming of natural gas. The chemical industry also uses hydrogen, mostly to manufacture ammonia and other nitrogen-based fertilizers. Hydrogen for the chemical industry is also produced from steam reforming of natural gas, although some chemical plants use coal gasification (i.e., partial oxidation) to produce hydrogen. In total, about 95 percent of U.S. hydrogen production for supplemental refinery needs and the chemical industry is produced from natural gas using steam reforming technology.
stockmanchl99

Information about Biofuel, what is Biofuel, renewable energy solutions, Ethanol uses - 0 views

www.biofuelwatch.org

biofuel

shared by stockmanchl99 on 12 Mar 13 - No Cached
  • Basically biofuel is produced by using ethanol from naturally grown plant matter which allows for a more sustainable and environmentally friendly earth.
  • Bio fuel is a natural alternative from other fossil fuels and is attained from living or biological material that has just died. Basically biofuel is produced by using ethanol from naturally grown plant matter which allows for a more sustainable and environmentally friendly earth. To assist in the manufacturing of biofuel, the plants and plant-derived materials that contribute to its formation includes corn, corn cob, sugar cane, soybeans, flaxseed, rapeseed, vegetable oils, waste cooking oils, animal fats, tall oil and even cow manure. However, at present the most widely used source of bioeenergy is of course wood.
carusonepay99

How sustainable is wind power? | OregonLive.com - 0 views

blog.oregonlive.com/...sustainable_is_wind_power.html

wind sustainable

shared by carusonepay99 on 08 Mar 13 - No Cached
  • When looking at a wind powered electric generator, many people see a permanent source of renewable electricity. The problem with this image is that wind generators have shorter life spans than the term “sustainable” would imply. Wooden windmills in Holland that used to power industrial machinery before the invention of steam engines were more durable than these picket lines of propellers along our Columbia Gorge. The composite material and rare earth chemicals they require are both perishable and costly to replace. More important, like fossil fuels, our planet has a finite supply of these materials. Wind power is such an inefficient means of generating electricity that a world that seriously relied on it the way we do fossil fuels would run out of the limited resources needed to build and maintain them long before our present trends would exhaust our vast bounty of hydrocarbons.
  • carusonepay99 on 08 Mar 13
     
    "The first hard core environmentalist I ever encountered in life taught my 8th grade energy class at Estacada Junior High, a course that President Carter's brand new Department of Education had mandated upon us a decade before as a symbolic gesture to show he cared about America's energy future. Despite an overall policy of separating church and state, in this class it was the gospel that we would deplete all fossil fuels by the year 2000. Back when "2000" was preceded by "THE YEAR" it seemed so far away didn't it? The only lasting lesson this course taught me was a healthy skepticism of government mandated indoctrination."
cottonetar98

GENERATION TO THE NATION - 0 views

www.ehow.com/es_4740597_wind-farm-work.html

wind form ehow

shared by cottonetar98 on 08 Mar 13 - No Cached
cottonetar98 liked it
  • Wind is created when the sun hits the earth. The air above water and the air above the ground heat at different rates. Since the air above the ground heats faster, the warm air from the ground hits the atmosphere first. It then is pushed out toward the sea. As the air heads toward the sea, it gets colder and sinks back down to the sea level. This creates a current pushing the sea air toward the land in the form of wind. The stronger the sun's energy on the land and water, the faster the wind will circulate.
  • As the gearbox turns, it feeds the RPM into the generator, which transfers the energy into usable electrical energy and stores it. Large cables are attached to the generator that feed the electrical currents from the generators of all the wind turbines on the farm into one electrical storage area. The energy can then be transported through power lines around the area for commercial and home usage.
  • cottonetar98 on 08 Mar 13
     
    What makes wind. 
bakereli00

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."
mannixjul00

Tidal Energy | Marine Current Turbines - 0 views

www.marineturbines.com/Tidal-Energy

tidal tide

shared by mannixjul00 on 11 Mar 13 - No Cached
  • idal turbines are very much like an underwater windmill where the blades are driven by consistent, fast-moving currents.  The submerged rotors harness the power of the tidal streams to drive generators, which in turn produce electricity. Water is 832 times denser than air so consequently tidal turbine rotors can be are much smaller than wind turbine rotors generate equivalent  amounts of electricity, and they can be deployed much closer together. Devices that harness tidal stream energy present a unique set of engineering challenges in terms of design, installation and maintenance. During operation, the force of the tidal flow in Strangford Lough is equivalent to a 345 mph wind generating a 100 tonnes of thrust on the rotors. The unique SeaGen design allows capture of the maximum amount of tidal energy whilst keeping maintenance and connectivity costs low.
  • Tidal turbines are very much like an underwater windmill where the blades are driven by consistent, fast-moving currents.  The submerged rotors harness the power of the tidal streams to drive generators, which in turn produce electricity. Water is 832 times denser than air so consequently tidal turbine rotors are much smaller than wind turbine rotors generate equivalent  amounts of electricity, and they can be deployed much closer together. Devices that harness tidal stream energy present a unique set of engineering challenges in terms of design, installation and maintenance. During operation, the force of the tidal flow in Strangford Lough is equivalent to a 345 mph wind generating a 100 tonnes of thrust on the rotors.
  • kramerjac99 on 11 Mar 13
     
    How it works.
carpenteraut98

How Are Hydrogen Fuel Cells Affecting the Environment? | eHow.com - 0 views

www.ehow.com/ls-affecting-environment_.html

fuel cell pollution

shared by carpenteraut98 on 11 Mar 13 - No Cached
  • por and a small amou
  • Unlike internal combustion and the burning of fossil fuels, hydrogen fuel cells do not produce particulates or emissions other than water vapor and a small amount of carbon dioxide.
  • carpenteraut98 on 11 Mar 13
     
    "hydrogen fuel cells do not produce particulates or emissions other than water vapor and a small amount of carbon dioxide."
sconzomic99

Tidal Energy for Kids - 0 views

renewableenergyindex.com/...tidal-energy-kids

sustainable pollution energy tide cost

shared by sconzomic99 on 11 Mar 13 - No Cached
  • As far as producing electricity goes, tidal energy is one of the cheapest kinds.
  • Since the tidal cycle repeats itself every 24 hours, there is a guarantee that power can be produced this way every day of the year.
  • can help protect delicate coastal areas from storm damage, as well
  • ...4 more annotations...
  • can protect against erosion
  • Even though tidal energy does not produce any kind of pollution, the barrages completely change the coastline. Many animals and birds make their homes on the mudflats around tidal basins. When the tidal energy plants flood these areas, the habitats of these animals are destroyed. Holding the water back also causes silt to build up inside the tidal basin and can cause the released water to take longer to clear from dirt and materials. This can keep the water around the coastline from settling and becoming clear as quickly as it usually does. There is also evidence that using tidal power plants can change the migration patterns of many ocean creatures.
  • Other people think that since tidal energy plants can only produce electricity for about ten hours every day,
  • it is not worth the danger to plants, animals, and ecosystems.
rascoekat00

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
  • ...2 more annotations...
  • "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. 
butlerlei98

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."
conwayjam99

What are the advantages and disadvantages of wind power - 0 views

wiki.answers.com/...nd_disadvantages_of_wind_power

wind

shared by conwayjam99 on 13 Mar 13 - No Cached
  • conwayjam99 on 13 Mar 13
     
    "Wind power will become cheaper than fossil fuel in the next few years (when the price of carbon is added to coal and oil), and in many places already is."
smithkai143

What environmental benefits does tidal energy have compared to the traditional fossil f... - 0 views

www.answerbag.com/721036

tidal form fossil fossil fuel fuel

shared by smithkai143 on 29 Oct 12 - No Cached
  • A benefit is very little pollution. However, there is a very serious potential draw back. It can be very hard of fish populations. The proposal for tidal power is to put turbines on the bottom of a bay and let the water rushing in and out with the tide turn them and generate electricity. However, along with the water will come fish and other marine animals. What do you think will happen when these critters get sucked into the turbines. Can you say sushi, boys and girls? Putting some kind of screen in front of the turbine to prevent this would just mean that the animals would be sucked up against the screens, obstructing the flow of water through the turbines.
filionmar99

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.
dpurdy

Tidal Energy Pros and Cons - Energy Informative - 0 views

energyinformative.org/tidal-energy-pros-and-cons

tidal advantages disadvantages cost

shared by dpurdy on 22 Oct 12 - No Cached
  • This ultimately reduces the cost these power plants can sell their electricity
  • It is important to realize that the methods for generating electricity from tidal energy is a relatively are relatively new technologies
  • Tidal Energy is a renewable energy source. This energy source is a result of the gravitational fields from both the sun and the moon, combined with the earth’s rotation around its axis, resulting in high and low tides.
  • ...1 more annotation...
  • In addition to being a renewable energy, it does not emit any climate gases and does not take up a lot of space
  • buherjac99 on 22 Oct 12
     
    pollution
Connor Wiggins

Fuel Cells Information, Fuel Cells Facts, Fuel Cells Technology - National Geographic - 0 views

environment.nationalgeographic.com/...fuel-cell-profile

fuel cell form

shared by Connor Wiggins on 22 Oct 12 - No Cached
  • A fuel cell is a device that uses a source of fuel, such as hydrogen, and an oxidant to create electricity from an electrochemical process.
  • Most fuel cells in use today, however, use hydrogen and oxygen as the chemicals.
  • Although hydrogen is the most abundant element in the universe, it is difficult to store and distribute. Canisters of pure hydrogen are readily available from hydrogen producers, but as of now, you can't just fill up with hydrogen at a local gas station.
  • ...2 more annotations...
  • All fuel cells have the same basic configuration; an electrolyte and two electrodes. But there are different types of fuel cells, based mainly on what kind of electrolyte they use.
  • All fuel cells have the same basic configuration; an electrolyte and two electrodes. But there are different types of fuel cells, based mainly on what kind of electrolyte they use.
  • carrowluk99 on 29 Oct 12
     
    According to many experts, we may soon find ourselves using fuel cells to generate electrical power for all sorts of devices we use every day
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