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dpurdy

EnergyBC: Tidal Power - 2 views

www.energybc.ca/...tidal.html

tide form convert history

shared by dpurdy on 12 Mar 13 - No Cached
  • his is somewhat balanced out by long plant lives of 100 years for the actual barrage structure, and 40 for the equipment, as well as low operating costs.
  • An estimate is given by researcher Eleanor Denny. Denny estimates that in order for a facility to be profitable, its capital cost should be less than €530,000 (~$700,000 USD) per MegaWatt which with the current technology is not a realistic goal, meaning that so far the industry produces negative net benefits.50
  • Canada's Race Rocks site, where a single turbine generator converts 65 kW of energy, cost $4,000,000.54 This figure was met with $3,000,000 investment from project partner EnCana's Environmental Innovation Fund, and a grant of just under $1 million awarded to Pearson College and their partners in the project.
  • ...5 more annotations...
  • This plant produces about 100 times the power generated at Race Rocks. An investment of around €8.5 million ($11 million USD) made SeaGen a reality.
  • The environmental impacts of tidal barrage include hampered fish migration, forced water level changes on the basin behind the barrage, reduced salinity in the basin due to low quantities of ocean water, and reduced ability of currents to transport and suspend sediments
  • sustainable energy resources produce limited amounts of carbon dioxide emissions
  • , they are, by nature, reliant on the natural environment and therefore are vulnerable to the effects of climate change
  • Brief History of Tidal Power The energy stored in tides been known to people for many centuries. The earliest records of tidal mills are dated back to the 8th Century CE.7 The tidal mills were mainly used for grain grinding and were of similar design to the conventional water mills with the exception of the addition of a dam and reservoir. The industrial revolution increased demand for power but tidal energy never got off the ground, undercut by cheap fossil fuels and other developments which offered easier access to power generation. Existing tidal mills became as obsolescent as pre-industrial water-mills. The first large scale modern tidal electric plant started to operate in La Rance Estuary, St. Malo, France in the 1960s and has been operating ever since. In recent years the search for renewable, non-polluting energy sources and the increase in fossil fuel prices has encouraged renewed interest in tidal power.
wellsann99

Wind Energy: Facts - 1 views

www.mass.gov/...wind-energy-facts.html

wind current

shared by wellsann99 on 12 Mar 13 - No Cached
  • Over 8,500 MW were installed in the US in 2008 (just beating out China with 6,300 MW). This represents: 50 percent increase from 200742 percent of all new generating capacity installed in 2008$17 billion investment44 million tons of carbon emissions avoided (equivalent of 7 million cars)35,000 new jobs
  • wellsann99 on 12 Mar 13
     
    wind power today
brennantho98

Energy Resources: Wind power - 0 views

www.darvill.clara.net/...wind.htm

wind sustainable

shared by brennantho98 on 12 Mar 13 - No Cached
  • A good method of supplying energy to remote areas.
  • Wind is free, wind farms need no fuel.
  • The wind is not always predictable - some days have no wind.
  • ...1 more annotation...
  • Wind power is renewable. Winds will keep on blowing, it makes sense to use them.
mchughkon99

Tidal Power: Pros and Cons - 0 views

www.triplepundit.com/...tidal-power-pros-cons

tide history

shared by mchughkon99 on 12 Mar 13 - No Cached
  • Day and night, the vast waters of the ocean press and recede along the shorelines of Earth’s every continent in accordance to the celestial movements of our planet in relation to the sun and the moon
  • ay and night, the vast waters of the ocean press and recede along the shorelines of Earth’s every continent in accordance to the celestial movements of our planet in relation to the sun and the moon
  • Records of ocean power conversion date back to 900A.D. where the power of tidal movement was used to grind grains. The first modern commercial tidal power was installed off the coast of St. Malo, in Northern France. Installed in 1965, it has been operating continuously since then, producing 240 MW with every tide.
  • mchughkon99 on 12 Mar 13
     
    how the tides move to create energy
rainwateremi99

The Cost of Biofuels in Guatemala - Photographs - NYTimes.com - 0 views

www.nytimes.com/...06guatemala-15.html

current biofuels

shared by rainwateremi99 on 12 Mar 13 - No Cached
  • Now that the United States is using 40 percent of its crop to make biofuel, it is not surprising that tortilla prices have doubled in Guatemala, which imports nearly half of its corn. 
murphymat98

Global Pollution and Prevention News: Tidal Power - 0 views

www.enn.com/...42118

tide pollution

shared by murphymat98 on 12 Mar 13 - No Cached
  • One area of concern is how underwater noise generated by the turbines could affect marine mammals that use auditory cues to navigate and communicate with each other.
  • murphymat98 on 12 Mar 13
     
    noise
cheniermab99

Wind Energy: Facts - 0 views

www.mass.gov/...wind-energy-facts.html

wind co2

shared by cheniermab99 on 12 Mar 13 - No Cached
  • 1 MW of wind energy can offset approximately 2,600 tons Waste heat recovery  file size 4MB of carbon dioxide annually.
  • 29,440 Megawatts (MW) of wind energy are currently installed in the United States, and an additional 5,866 MW are under construction.Over 8,500 MW were installed in the US in 2008 (just beating out China with 6,300 MW). This represents: 50 percent increase from 200742 percent of all new generating capacity installed in 2008$17 billion investment44 million tons of carbon emissions avoided (equivalent of 7 million cars)35,000 new jobs
cheniermab99

Wind Turbines for Electricity - 1 views

zfacts.com/244

wind co2 cost

shared by cheniermab99 on 12 Mar 13 - No Cached
  • In 2006, wind power supplied 0.6% of US electricity but reduced CO2 emission from electricity production by a full 1%.
  • What really matters is the cost to society. With current subsidy methods, it costs around 3¢/kWh
  •   One-Time Cost per kW Capacity (usage) Factor Fixed Cost per kWh Variable Cost per kWh Total Cost per kWh Gas Turbine $439 15% 5.2¢ 8.7¢ 13.9¢ Coal $1,338 90% 2.7¢ 1.9¢ 4.5¢ Nuclear $2,180 90% 4.3¢ 0.3¢ 4.6¢ Wind $1,254* 30% 7.5¢ 0.0¢ 7.5¢
  • ...1 more annotation...
  • as coal is the worst source of CO2. Thirty years from now, wind power might be cutting global GHG emissions by 10%.
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.  
rascoekat00

Tidal Power - How Tidal Power Plants Work - 0 views

inventors.about.com/...tidal_power.htm

tidal energy

shared by rascoekat00 on 11 Mar 13 - Cached
  • Tidal power traditionally involves erecting a dam across the opening to a tidal basin. The dam includes a sluice that is opened to allow the tide to flow into the basin; the sluice is then closed, and as the sea level drops, traditional hydropower technologies can be used to generate electricity from the elevated water in the basin. Some researchers are also trying to extract energy directly from tidal flow streams.
  • Another form of ocean energy is called tidal energy. When tides comes into the shore, they can be trapped in reservoirs behind dams. Then when the tide drops, the water behind the dam can be let out just like in a regular hydroelectric power plant.
  • kramerjac99 on 11 Mar 13
     
    How it works
greenhan99

Spotlight: How Biofuel Is Made - 0 views

www.triplepundit.com/...biofuel-made

biofuel convert

shared by greenhan99 on 11 Mar 13 - No Cached
  • Alcohol-based biofuels are produced in much the same way as liquor, though, of course with different emphasis. In fact, ethyl alcohol, or ethanol, which is the most commonly used bio-alcohol, is the same type of alcohol that is found in whiskey, vodka, gin, etc.  All of these are based on the fermentation of starches and sugars. The ingredients are gathered, ground up, mixed with water and left to ferment with the help of yeast or other organisms for some period of time (three years for Scotch whiskey!) before it is finally distilled into the final product.
wellsann99

Wind Turbines - How Long Have They Been Around? - 1 views

www.articlesbase.com/...-they-been-around-1479922.html

wind history

shared by wellsann99 on 11 Mar 13 - No Cached
  • Essentially wind turbines were made first between 500-900 A.D. by the Persians and were used as a water pumping system
  • wellsann99 on 11 Mar 13
     
    when it was first made 
kennedyeri98

STEP - Heating houses by sunlight-How sustainable is solar power generally? - 0 views

www.stepin.org/casestudy.php

solar sustainable

shared by kennedyeri98 on 11 Mar 13 - No Cached
  • Solar energy does little to harm the environment.
  • Even when the sun does not shine because of cloud or dust, its diffuse rays can still be used to produce electricity or heat.
greenhan99

The Biofuels FAQs: The Facts About Biofuels: Ethanol - 0 views

www.energyfuturecoalition.org/...fact_ethanol.htm

biofuel current

shared by greenhan99 on 11 Mar 13 - No Cached
  • Biodiesel consumption was much lower, about 250 million gallons in 2006
  • which requires an annual increase in biofuels use to 7.5 billion gallons by 2012.
kramerjac99

Tidal Energy Ltd » The Technology - 0 views

www.tidalenergyltd.com/?page_id=640

tidal energy

shared by kramerjac99 on 11 Mar 13 - No Cached
  • Tidal energy is a form of hydropower that converts the energy of the tides into electricity or other useful forms of power. The tide is created by the gravitational effect of the sun and the moon on the earth. Tidal energy is therefore a predictable form of renewable energy, which can be harnessed in two forms:
  • kramerjac99 on 11 Mar 13
     
    what it is.
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