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tavarreskat99

Tidal Energy | Pros for Wave and Tidal Power - 3 views

www.oceanenergycouncil.com/...Tidal-Energy.html

pollution tide

shared by tavarreskat99 on 03 Nov 11 - Cached
  • Tidal energy is one of the oldest forms of energy used by humans. Indeed, tide mills, in use on the Spanish, French and British coasts, date back to 787 A.D.. Tide mills consisted of a storage pond, filled by the incoming (flood) tide through a sluice and emptied during the outgoing (ebb) tide through a water wheel. The tides turned waterwheels, producing mechanical power to mill grain. We even have one remaining in New York- which worked well into the 20th century.
  • Tidal power is non-polluting, reliable and predictable.Tidal barrages, undersea tidal turbines - like wind turbines but driven by the sea - and a variety of machines harnessing undersea currents are under development. Unlike wind and waves, tidal currents are entirely predictable.
  • A tidal range of at least 7 m is required for economical operation and for sufficient head of water for the turbines
  • ...10 more annotations...
  • Currently, although the technology required to harness tidal energy is well established, tidal power is expensive, and there is only one major tidal generating station in operation. This is a 240 megawatt (1 megawatt = 1 MW = 1 million watts) at the mouth of the La Rance river estuary on the northern coast of France
  • Tidal electricity can be used to displace electricity which would otherwise be generated by fossil fuel (coal, oil, natural gas) fired power plants, thus reducing emissions of greenhouse and acid gasses.
  • There is a high capital cost for a tidal energy project, with possibly a 10-year construction period.
  • Electricity can be generated by water flowing both into and out of a bay. As there are two high and two low tides each day, electrical generation from tidal power plants is characterized by periods of maximum generation every twelve hours, with no electricity generation at the six hour mark in between.
  • Tidal energy is a renewable source of electricity which does not result in the emission of gases responsible for global warming or acid rain associated with fossil fuel generated electricity. Use of tidal energy could also decrease the need for nuclear power, with its associated radiation risks. Changing tidal flows by damming a bay or estuary could, however, result in negative impacts on aquatic and shoreline ecosystems, as well as navigation and recreation.
  • Indeed, tide mills, in use on the Spanish, French and British coasts,
  • date back to 787 A.D..
  • Tidal power is non-polluting, reliable and predictable.Tidal barrages, undersea tidal turbines - like wind turbines but driven by the sea - and a variety of machines harnessing undersea currents are under development. Unlike wind and waves, tidal currents are entirely predictable.
  • idal energy is one of the oldest forms of energy used by humans. Indeed, tide mills, in use on the Spanish, French and British coasts, date back to 787 A.D.. Tide mills consisted of a storage pond, filled by the incoming (flood) tide through a sluice and emptied during the outgoing (ebb) tide through a water wheel. The tides turned waterwheels, producing mechanical power to mill grain. We even have one remaining in New York- which worked well into the 20th century. Tidal power is non-polluting, reliable and predictable.Tidal barrages, undersea tidal turbines - like wind turbines but driven by the sea - and a variety of machines harnessing undersea currents are under development. Unlike wind and waves, tidal currents are entirely predictable.
  • Tidal power is non-polluting, reliable and predictable.Tidal barrages, undersea tidal turbines - like wind turbines but driven by the sea - and a variety of machines harnessing undersea currents are under development. Unlike wind and waves, tidal currents are entirely predictable.
  • butlerlei98 on 08 Mar 13
     
    "Tidal power is non-polluting, reliable and predictable.Tidal barrages, undersea tidal turbines - like wind turbines but driven by the sea - and a variety of machines harnessing undersea currents are under development. Unlike wind and waves, tidal currents are entirely predictable."
  • kramerjac99 on 11 Mar 13
     
    when it started to be used and who it was used by.
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.
  • anonymous on 28 Sep 13
     
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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.
rascoekat00

Tidal Power Facts: Understanding How Tidal Energy Works | Sustainable Earth | Going Green Tips | Eco-Friendly Living - 0 views

www.isustainableearth.com/...tanding-how-tidal-energy-works

understanding tidal energy

shared by rascoekat00 on 23 Sep 13 - No Cached
  • Tidal power, often referred to as tidal energy, is a type of hydropower that harnesses the energy of our ocean’s tides or other flowing waterways to produce power, usually in the form of electricity.  As sea levels rise and fall or the currents flow underwater a potential energy is created.  By using equipment such as tidal energy generators and underwater turbines in areas of high tidal movements, the kinetic motion of the ocean can be used to turn the turbines, thus producing electricity. 
westkea00

Voith | Wave power plants - 0 views

www.voith.com/...wave-power-plants-590.html

shared by westkea00 on 25 Sep 13 - No Cached
  • With this technology, sea water turbines do not come into contact with water
  • Instead, a column of air is set in motion which drives the machines. In detail, this works in the following manner: The waves spill into a hollow container which is open to the sea. This compresses and calms the air column in a so-called collector in a similar way to how an air pump works. The power plant "breathes" in and out. The pressure difference is then turned into rotary energy in a so-called Wells turbine (named after its inventor). This is in turn passed to a generator where electricity is produced. This means that the turbine has the air periodically flow through it from both sides, depending on whether the device is "breathing" in or out. Because of the special rotor geometry, there is no need to either periodically change the blade angles or the direction of rotation. If you consider the fact that an average of some 3 million waves break on to the coast every year, it is clear that only this simple turbine design can offer maximum reliability.
azaerttre99

How Do Solar Panels Work? - The Solar Company - 0 views

www.thesolarco.com/...how-does-solar-work

solar convert

shared by azaerttre99 on 24 Sep 13 - No Cached
  • The sun transmits energy in the form of electromagnetic radiation. When this radiation is absorbed by the solar cells, a chemical reaction occurs, causing rapid electron movement. Because of the way the cells are manufactured with layers of material with differing atomic structures, the electrons are forced to move in one direction, creating direct current, or DC. It then flows into an inverter which converts the DC into alternating current, or AC, to be usable in your home or business.
schmettererdav00

How Biomass Energy Works | Union of Concerned Scientists - 0 views

www.ucsusa.org/...how-biomass-energy-works.html

biofuel current

shared by schmettererdav00 on 05 Oct 13 - No Cached
  • schmettererdav00 on 05 Oct 13
     
    In the United States, we already get over 50 billion kilowatt-hours of electricity from biomass, providing nearly 1.5 percent of our nation's total electric sales.
ricciardellinick

How Fuel Cells Work - 0 views

hydrogen picture

shared by ricciardellinick on 13 Mar 13 - No Cached
gonzalezisa00

Environment for Kids: Wave and Tidal Energy - 0 views

www.ducksters.com/...wave_and_tidal_energy.php

history

shared by gonzalezisa00 on 12 Mar 13 - No Cached
  • There are also three main ways that tidal energy is harnessed: Tidal Barrages - A tidal barrage works like a dam. When the tide goes high, the reservoir fills up. When the tide drops the dam lets the water out. In both directions the moving water can spin the blades of turbines to create electricity. Tidal Fences - These are smaller structures than a barrage. A number of vertical turbines form a fence between two land masses. When the tide moves in or out, the turbines spin and generate electricity. Tidal Turbines - These are individual turbines placed anywhere there is a strong tidal flow.
  • Tidal power to turn water wheels and grind grains was used as far back as Roman times and the Middle Ages. The idea of using tidal power for electricity is fairly recent, but the costs have been too high to make it a major energy source. Recent technological advances have shown that it could become a competitive and viable source
  • Tidal turbines are more expensive to build and maintain than wind turbines, but produce more energy. They also produce energy more consistently as the tide is continuous while the wind doesn't always blow.
  • ...1 more annotation...
  • Concepts for wave energy have existed since the 1800s, however modern wave technology began in the 1940s with the experiments of scientist Yoshio Masuda
ricciardellinick

Energy Studies - How Fuel Cell Works - 2 views

intraweb.stockton.edu/...page.cfm

energy fuel cell fuel cell form

shared by ricciardellinick on 12 Mar 13 - No Cached
  • Hydrogen is the simplest of all elements with one electron and one proton. Two hydrogen atoms form one hydrogen gas molecule, or H2, but this gas is rarely found in large quantities in nature. Hydrogen’s chemical properties allow it to combine easily with other elements to form other molecules.
  • ricciardellinick on 12 Mar 13
     
    "Hydrogen is the simplest of all elements with one electron and one proton. Two hydrogen atoms form one hydrogen gas molecule, or H2, but this gas is rarely found in large quantities in nature. Hydrogen's chemical properties allow it to combine easily with other elements to form other molecules"
westkea00

Wave and Tidal Energy - 1 views

learning.media.mit.edu/...wave%20energy.html

shared by westkea00 on 12 Mar 13 - No Cached
  • But it has only been in recent years that it has started to become more realistic due to advance in research and technology.
  • Wave and tidal energy harvesting has been around for a few decades. But it has only been in recent years that it has started to become more realistic due to advance in research and technology. Some speculates that wave and tidal energy can supply at least 10 percent of the world's energy consumption. How much power can be harvested is determined mainly on the wave activity. A map of wave heights is shown towards the end of the document.
  • This method works much the same way as wind turbines. However, since water is four times denser than air, the tidal turbine can be much smaller to generate the same amount of energy. The ideal water current is between 2-2.5 m/s, which is usually at depths of 20-30m within 1 km from the shore. A commercial scale turbine can produce 300 kWatts but this can scale up depending on the farm's size.
  • ...2 more annotations...
  • Wave and tidal energy harvesting has been around for a few decades.
  • Wave and tidal energy harvesting has been around for a few decades
  • sopranodan99 on 23 Sep 13
     
    Wave and tidal energy harvesting has been around for a few decades. But it has only been in recent years that it has started to become more realistic due to advance in research and technology.
  • donohueale00 on 23 Sep 13
     
    Wave and tidal energy harvesting has been around for a few decades. But it has only been in recent years that it has started to become more realistic due to advance in research and technology. Some speculates that wave and tidal energy can supply at least 10 percent of the world's energy consumption. How much power can be harvested is determined mainly on the wave activity. A map of wave heights is shown towards the end of the document.
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. 
westkea00

Wave Power - Energy from ocean surface waves - 1 views

www.alternative-energy-news.info/...wave-power

shared by westkea00 on 08 Mar 13 - No Cached
  • Wave energy is produced when electricity generators are placed on the surface of the ocean
  • Energy output is determined by wave height, wave speed, wavelength, and water density.
  • The energy provided is most often used in desalination plants, power plants and water pumps.
  • ...4 more annotations...
  • The energy provided is most often used in desalination plants, power plants and water pumps.
  • Just like wind mills and wind turbines that generate power and electricity from the wind, scientists are now working to generate power from the sea
  • Wave energy is among the impressive list of renewable energy resources that is being developed in the United States.
  • Ocean wave energy can be captured directly from surface waves. Blowing wind and pressure fluctuations below the surface are the main reasons for causing waves.
  • Noah Buckingham on 08 Mar 13
     
    Controlling factor of electric power.
westkea00

Energy Resources: Wave power - 3 views

www.darvill.clara.net/...wave.htm

shared by westkea00 on 08 Mar 13 - Cached
  • Waves are a powerful source of energy.
  • The problem is that it's not easy to harness this energy and convert it into electricity in large amounts.
  • wave power stations are rare
  • ...10 more annotations...
  • Once you've built a wave power station, the energy is free, needs no fuel and produces no waste or pollution
  • The energy is free - no fuel needed, no waste produced.
  • Not expensive to operate and maintain.
  • Can produce a great deal of energy.
  • Some designs are noisy. But then again, so are waves, so any noise is unlikely to be a problem.
  • Ocean waves are caused by the wind as it blows across the sea. Waves are a powerful source of energy.
  • Some designs are noisy. But then again, so are waves, so any noise is unlikely to be a problem
  • At a wave power station, the waves arriving cause the water in the chamber to rise and fall, which means that air is forced in and out of the hole in the top of the chamber. We place a turbine in this hole, which is turned by the air rushing in and out. The turbine turns a generator. A problem with this design is that the rushing air can be very noisy, unless a silencer is fitted to the turbine. The noise is not a huge problem anyway, as the waves make quite a bit of noise themselves.
  • At a wave power station, the waves arriving cause the water in the chamber to rise and fall, which means that air is forced in and out of the hole in the top of the chamber. We place a turbine in this hole, which is turned by the air rushing in and out. The turbine turns a generator. A problem with this design is that the rushing air can be very noisy, unless a silencer is fitted to the turbine. The noise is not a huge problem anyway, as the waves make quite a bit of noise themselves.
  • A company called Pelamis Wave Power are developing a method of offshore wave energy collection, using a floating tube called "Pelamis"
  • rodriguezjos99 on 08 Mar 13
     
    " Advantages   The energy is free - no fuel needed, no waste produced. Not expensive to operate and maintain. Can produce a great deal of energy. Disadvantages Depends on the waves - sometimes you'll get loads of energy, sometimes almost nothing. Needs a suitable site, where waves are consistently strong. Some designs are noisy. But then again, so are waves, so any noise is unlikely to be a problem. Must be able to withstand very rough weather."
  • gonzalezisa00 on 25 Sep 13
     
    One of them works like a swimming pool wave machine in reverse. At a swimming pool, air is blown in and out of a chamber beside the pool, which makes the water outside bob up and down, causing waves.  
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