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dpurdy

Tidal stream generators - Brightside - 0 views

www.brightknowledge.org/...tidal-stream-generators

tidal how

shared by dpurdy on 03 Nov 12 - No Cached
  • Tidal stream generators look and work like underwater wind turbines. As opposed to using the rising and falling movement of the tides, tidal stream generators take advantage of the fast moving sea currents (tidal streams), which flow when tides are moving in and out. These tidal streams cause the turbines to rotate, turning the generators which generate electricity. Tidal stream generators have the advantage of being much cheaper to build, and do not have as much of an environmental impact as a tidal barrage. The turbines turn relatively slowly, hence do not affect sea life. This is different to tidal barrages which can disrupt fish migrating up rivers from the sea.
smithkai143

Re: How is tidal power converted to electricity? - 0 views

www.madsci.org/...1017154685.Ph.r.html

tidal convert how electricity

shared by smithkai143 on 29 Oct 12 - No Cached
  • Tidal Energy originates from gravitational energy. Imagine you have a damn- like structure built along a river. During the high tide, the water flows into the river, causing the turbine to rotate and thus generating electricity. During the low tide, the water flows from the river to the sea, again, turning the turbine. (An electricity generating turbine consists of rotating wires surrounded by strong fixed magnetic field)
cheniermab99

Wind Power: clean, sustainable, and affordable | Union of Concerned Scientists - 0 views

www.ucsusa.org/...coalvswind

wind sustainable

shared by cheniermab99 on 22 Oct 12 - No Cached
  • Wind power generates electricity with... No air emissions No fuel to mine, transport, or store No cooling water No water pollution No wastes
  • Wind power can reduce pollution generated by fossil fuels such as coal, oil, and gas. A typical (750 kW) wind turbine provides enough power for 328 typical (non-electric heating) homes.
  • Wind power can reduce pollution generated by fossil fuels such as coal, oil, and gas. A typical (750 kW) wind turbine provides enough power for 328 typical (non-electric heating) homes.
  • ...6 more annotations...
  • Wind power can reduce pollution generated by fossil fuels such as coal, oil, and gas. A typical (750 kW) wind turbine provides enough power for 328 typical (non-electric heating) homes.
  • No fuel to mine, transport, or store
  • Wind power can reduce pollution generated by fossil fuels such as coal, oil, and gas.
  • Wind power can reduce pollution generated by fossil fuels such as coal, oil, and gas.
  • Wind power can reduce pollution generated by fossil fuels such as coal, oil, and gas
  • Wind power can reduce pollution generated by fossil fuels such as coal, oil, and gas
ballardeth99

Infrastructure Battle: Renewable Tidal Energy vs. Telecommunications - 1 views

energy.aol.com/...tidal-energy-vs-telecommunicat

tidal infrastructure

shared by ballardeth99 on 22 Oct 12 - No Cached
  • first tidal energy turbines
  • Both technologies require room for periodic ship-borne maintenance and repair access, with subsurface equipment which could impinge on the other facility if they're too close. And if one of the turbines breaks, as happened in 2010 with an earlier tidal turbine in the Bay of Fundy, PC Landing worries it could damage the nearby cable.
wrighteri99

Tidal Energy Use - Pros and Cons - 0 views

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

cost

shared by wrighteri99 on 03 Nov 11 - Cached
  • Tidal energy use harnesses the water flow created primarily by the moon orbiting the Earth. As water is pulled toward the gravity of the moon, currents are created that can turn generator turbines.
  • Tidal energy use involving dams creates many of the same environmental concerns as damming rivers. Tidal dams restrict fish migration and cause silt build up which affects tidal basin ecosystems in negative ways. Systems that take advantage of natural narrow channels with high tidal flow rates have less negative environmental impact than dammed systems. But they are not without environmental problems. Both systems use turbines that can cause fish kills. But these are being replaced by new, more fish friendly turbines. The art and science of environmentally friendly hydro engineering is well advanced and will certainly be applied to any tidal energy project.
  • Because of intermittency and variable flow problems of tidal energy, it is a very limited resource. The DOE Tidal Energy link, above, states that there are only about 40 really good sites on Earth with high enough flows to be considered economically practical
  • ...2 more annotations...
  • Natural current driven tidal generators can be built into the structure of existing bridges. These generators will involve virtually no aesthetic problems.
  • Tidal energy use may not be a big player in our energy future, but it can make a contribution.
  • wrighteri99 on 05 Nov 12
     
    Tidal energy 
rascoekat00

Hydropower: Generate Energy with Rivers and Ocean Tides - For Dummies - 0 views

www.dummies.com/...y-with-rivers-and-ocean-t.html

tide energy electricity

shared by rascoekat00 on 20 Sep 13 - No Cached
  • When water flows toward the shore with the incoming tide, it flows through a tidal energy system, turning a turbine that generates electricity. When the tide shifts and flows in the opposite direction, away from shore, the tidal energy system again captures the energy with a turbine and converts it into electricity.
  • An important source of alternative energy is hydropower: converting the flow of rivers and ocean waves and tides into electricity through dams and turbines. The best part about both of these water sources is that they’re 100 percent renewable.
  • The main advantage of using ocean tides for energy is that tides and waves are a constant, unchanging, clean source of energy. The main disadvantage is that tidal energy systems may impact the environment by changing the flow of water into shoreline and estuarine ecosystems.
kirkpatrickcon99

Articles about Wind Turbines - Chicago Tribune - 0 views

articles.chicagotribune.com/...wind-turbines

wind current

shared by kirkpatrickcon99 on 20 Sep 13 - No Cached
  • The world will have enough wind turbines to generate more than 300 gigawatts of power - the equivalent of 114 nuclear power plants
kurishkri00

About Wind Energy - 0 views

www.masscec.com/...wind-energy

wind form

shared by kurishkri00 on 23 Sep 13 - No Cached
  • kurishkri00 on 23 Sep 13
     
    Wind turbines harness wind energy to produce electricity that can be used to power homes and businesses across the Commonwealth. Wind power systems range from small turbines that power a single home or business to large, multi-turbine wind farms that feed into the grid and generate enough electricity to power thousands of Massachusetts homes.
bishophan00

Where Does Wind Power Come From? - 0 views

www.renewableenergyworld.com/...here-does-wind-power-come-from

wind

shared by bishophan00 on 25 Sep 13 - No Cached
  •  Wind power is an interesting renewable energy source as wind turbines can essentially be placed anywhere geographically where there is ample wind to turn the wind blades.
  • One thing that we haven't written about extensively on the MyEnergySolution.com blog is wind power.  Wind power is an interesting renewable energy source as wind turbines can essentially be placed anywhere geographically where there is ample wind to turn the wind blades.
  • o put this in context, an average U.S. household uses about 10 megawatt-hours (MWh) of electricity each year. One megawatt of installed wind energy from a single large turbine can generate from 2,400 to more than 3,000 MWh annually – enough to power about 250 homes.
slaytonben99

How Do Wind Turbines Make Energy? | eHow - 1 views

www.ehow.com/9934_wind-turbines-energy.html

wind convert

shared by slaytonben99 on 24 Sep 13 - No Cached
  • A wind turbine gathers energy from the wind through the mechanical rotation of its blades. This is mechanically generated energy from kinetic energy that is then turned into electrical energy.
justice colvin

Converting Wind Energy Into Electricity - 0 views

www.envirocitizen.org/...1056.html

convert wind electricity

shared by justice colvin on 24 Sep 13 - No Cached
  •  The process of converting wind energy to electric energy uses a wind turbine. The wind turbines convert the kinetic energy in the wind into mechanical power. The mechanical power can be used for many things. In the past this meant pumping water, creating ventilation, or grinding food sources. While these things still occur, wind power is also used to generate electricity.      The wind turbine is a tall shaft with several horizontal rectangular blades attached to it. These blades are often covered with stiff material or ratting material. When turned they push against the air, causing pressure, and turning the inner shaft. This shaft connects to a generator which then creates energy.
mattisonmar00

Wind Turbine History - 2 views

centurionenergy.net/wind-turbine-history

wind history

shared by mattisonmar00 on 24 Sep 13 - No Cached
  • Wind machines were used in Persia as early as 200 B.C
  • The first windmill for electricity production in the United States was built in Cleveland, Ohio by Charles F Brush in 1888, and in 1908 there were 72 wind-driven electric generators from 5 kW to 25 kW.
  • The first utility grid-connected wind turbine operated in the UK was built by the John Brown Company in 1954
blackmerbru98

Wind Energy - 1 views

Nationally, renewable electricity generation in the US doubled from 2006 to 2011 and prices for wind, solar, and other clean energy technologies decreased, while employment in cleantech industry se...

http:__energyfellows.com_2012-clean-energy-generation-_ wind

started by blackmerbru98 on 03 Oct 13 no follow-up yet
turnmaster

Geothermal Electric Technology | Whole Building Design Guide - 0 views

www.wbdg.org/...geothermalelectrictech.php

geothermal convert

shared by turnmaster on 11 Mar 13 - No Cached
  • The conversion technologies from hydrothermal fluids to electricity include flash steam, dry steam, and binary-cycle power plants. Each geothermal electric system is made up of several key components including a: Production well Turbine Generator Injection well. Dry steam power plants are the simplest and oldest design, upon which the two other systems are based. They use a geothermal production well that produces fluid heated by the natural heat of the earth. The steam goes directly to a turbine, which drives a generator that produces electricity. The fluid then goes into an injection well, which is a well that is specifically drilled for the safe disposal of the geothermal fluids.
stewartlas97

History of Wind Power - 0 views

www.windturbinesnow.com/history-wind-power.htm

wind

shared by stewartlas97 on 12 Mar 13 - No Cached
  • stewartlas97 on 12 Mar 13
     
    "China has also laid claims to having invented windmills around 2,000 years ago, but the first documented claims appear in the 1200's. Around 250 A.D. the Romans introduced windmills into their culture and in the 700's so did Afghanistan. The Afghanistan windmills were also of the vertical axis style and cloth sails or reed matting was developed to catch the air. These windmills were used to grind corn and sugarcane plus draw water. In the 13th century Holland started developing large horizontal axis windmills. These four-blade windmills were larger, carried more torque and wind speed and could do more work than other windmills previously designed. The Holland windmills were also being used to grind grains and to drain part of the Rhine River. In the 19th century Denmark had an estimated 2,500 windmills and in the U. S. windmills were starting to be used to pump water. The Halladay windmill of 1854 is one such example of this. The first windmill in the world built for electrical production was in 1887 in Scotland built by Professor James Blyth. A year later in 1888 in the U. S. Charles Brush of Cleveland, Ohio built a large wind turbine used to generate electricity."
dittrichcai99

How can you convert geothermal energy to electrical energy - 0 views

wiki.answers.com/...al_energy_to_electrical_energy

geothermal

shared by dittrichcai99 on 12 Mar 13 - No Cached
  • dittrichcai99 on 12 Mar 13
     
    "In geothermal energy plants, water is injected into the ground. Underground, there are areas of rock that are heated by the presence of volcanic activity, such as magma near the surface. This heats the water, which comes back out of the ground very hot. A heat exchanger cools the water, which goes back into the ground. The heat from the heat exchanger boils another pipe of water into steam. The steam spins a turbine, which is connected to a generator, which creates electricity. "
adamsaub98

Lester Allan Pelton - Hydroelectric Power - 0 views

inventors.about.com/...bl_lester_pelton.htm

history

shared by adamsaub98 on 12 Mar 13 - No Cached
  • Lester Pelton invented a type of free-jet water turbine called the Pelton Wheel or Pelton turbine. Lester Pelton was born in 1829 in Vermillion, Ohio. In 1850, he immigrated to California
tavarreskat99

What are the advantages and disadvantages of alternative tidal power as an energy source - 1 views

wiki.answers.com/...idal_power_as_an_energy_source

tidal energy

shared by tavarreskat99 on 12 Mar 13 - No Cached
  • Advantages: Tidal energy is an alternative energy. The energy produced is clean and non polluting. There is no carbon dioxide or any other by-products released. It produces no greenhouse gases or other waste.It is a renewable energy that will help reduce our reliance on the burning of fossil fuels. There are two tides every day and they can be relied on. The energy is there for the taking.So the electricity supply is constant and efficient.Once you've built it, the energy is free because it comes from the ocean's powerIt needs no fuel.It produces electricity reliably.Not expensive to maintain.Tides are definitely predictable. There are two tides every day and they can be relied on. So the electricity supply is constant. Offshore turbines and vertical-axis turbines are not ruinously expensive to build and do not have a large environmental impact.A plant is expected to be in production for 75 to 100 yearsUses an abundant, inexpensive fuel source (water) to generate powerMay protect coastline against damage from high storm tides and provide a ready-made road bridge
  • Holding back the tide allows silt to build up on the river bed.The dams and barrages sometimes interfere with shipping. You will need to find a way to connect the electricity to the grid.Pose same threats as large dams, altering the flow of saltwater in and out of estuaries, which changes the hydrology and salinity and possibly negatively affects the marine mammals that use the estuaries as their habitatTurbidity decreases as a result of smaller volume of water being exchanged between the basin and the sea.The average salinity inside the basin decreases, also affecting the ecosystemA barrage across an estuary is very expensive to build, and affects a very wide area - the environment is changed for many miles upstream and downstream. Many birds rely on the tide uncovering the mud flats so that they can feed.There are few suitable sites for tidal barrages.Only provides power for around 10 hours each day, when the tide is actually moving in or out.
  • It only provides about 7% of the power needed for England and Wales that means that some people get their energy close to free and some pay a lot of moneyWater is not replenished, it cannot flow away so any dirt or pollution lingers around the coast much longerNeeds a very big piece of sea to be cost effectiveCannot be used inlandBarrage systems require salt resistant parts and lots of maintenanceAffects the lives of the people who rely on fishing for a means of livingLimited because the tide never speeds up or slows down, and occurs on 6 hour cycles. It is also dependent on the fetch distance. The fetch is the distance the tide rises and falls, so some beaches have a very small fetch, and others have a big fetch but hardly any have a large enough fetch to support tidal energy
chakrabortyshi00

Tidal Power: Nature's renewable hydro electric engine: Additional info - 2 views

www.bionomicfuel.com/wer-new-source-of-hydro-energy

sustainable wave

shared by chakrabortyshi00 on 12 Mar 13 - No Cached
  • Tidal power energy is still being studied and developed, but in the future it could be a major renewable hydropower energy source.
  • England, for example, could supply over 10 percent of its electricity in this way.
  • . Wind and solar energy generators convert much less.
  • ...2 more annotations...
  • They can convert about 80 percent of the energy into electricity
  • Another disadvantage is that the start-up costs involved are very high and a lot of time is required for the construction projects, which can cost millions of dollars and take up to 10 years to build
  • chakrabortyshi00 on 26 Sep 13
     
    Tidal hydropower energy has various advantages. The first of these is reliability and consistency. Other alternative energy sources like wind and solar can have varying amounts of energy generated depending on the weather conditions. Tidal power energy can generate electricity by the clock and indefinitely. This means that shortages can be easily avoided. In addition, tidal turbines are efficient when it comes to generating energy. They can convert about 80 percent of the energy into electricity. Wind and solar energy generators convert much less. Of course, another great benefit of tidal power renewable energy is that it is environmentally friendly. There are no CO2 emissions that are damaging to the atmosphere or Sulfur Dioxide emissions responsible for acid rain.
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