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dpurdy

Wave power - Wikipedia, the free encyclopedia - 2 views

en.wikipedia.org/...Wave_power

wave sustainable history location what grid

shared by dpurdy on 03 Nov 11 - No Cached
  • Waves are generated by wind passing over the surface of the sea. As long as the waves propagate slower than the wind speed just above the waves, there is an energy transfer from the wind to the waves.
  • The first known patent to utilize energy from ocean waves dates back to 1799 and was filed in Paris by Girard and his son.[12] An early application of wave power was a device constructed around 1910 by Bochaux-Praceique to light and power his house at Royan, near Bordeaux in France
  • Once the wave energy is captured at a wave source, power must be carried to the point of use or to a connection to the electrical grid by transmission power cables.[2
  • ...2 more annotations...
  • The realistically usable worldwide resource has been estimated to be greater than 2 TW.[49][50] Locations with the most potential for wave power include the western seaboard of Europe, the northern coast of the UK, and the Pacific coastlines of North and South America, Southern Africa, Australia, and New Zealand. The north and south temperate zones have the best sites for capturing wave power. The prevailing westerlies in these zones blow strongest in winter. Waves are very predictable; waves that are caused by winds can be predicted five days in advance.[citation needed]
  • There is a potential impact on the marine environment. Noise pollution, for example, could have negative impact if not monitored, although the noise and visible impact of each design varies greatly.[5]. Other biophysical impacts (flora and fauna, sediment regimes and water column structure and flows) of scaling up the technology is being studied.[51] In terms of socio-economic challenges, wave farms can result in the displacement of commercial and recreational fishermen from productive fishing grounds, can change the pattern of beach sand nourishment, and may represent hazards to safe navigation.[52] Waves generate about 2,700 gigawatts of power
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dpurdy

NREL: Learning - Biomass Energy Basics - 0 views

www.nrel.gov/...re_biomass.html

biomass co2

shared by dpurdy on 03 Nov 11 - Cached
  • The use of biomass energy has the potential to greatly reduce greenhouse gas emissions. Burning biomass releases about the same amount of carbon dioxide as burning fossil fuels. However, fossil fuels release carbon dioxide captured by photosynthesis millions of years ago—an essentially "new" greenhouse gas. Biomass, on the other hand, releases carbon dioxide that is largely balanced by the carbon dioxide captured in its own growth (depending how much energy was used to grow, harvest, and process the fuel).
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dpurdy

Energy Resources: Solar power - 0 views

home.clara.net/...solar.htm

solar how advantage disadvantage

shared by dpurdy on 03 Nov 11 - Cached
  • Advantages
  • Solar energy is free - it needs no fuel and produces no waste or pollution.
  • Handy for low-power uses such as solar powered garden lights and battery chargers, or for helping your home energy bills.
  • ...3 more annotations...
  • Disadvantages
  • Very expensive to build solar power stations, although the cost is coming down as technology improves. In the meantime, solar cells cost a great deal compared to the amount of electricity they'll produce in their lifetime.
  • Is it renewable? Solar power is renewable. The Sun will keep on shining anyway, so it makes sense to use it.
dpurdy

Energy Resources: Geothermal power - 0 views

home.clara.net/...geothermal.htm

pollution location cost how what geothermal

shared by dpurdy on 03 Nov 11 - Cached
  • Geothermal energy has been used for thousands of years in some countries for cooking and heating.
  • How it works
  • Hot rocks underground heat water to produce steam. We drill holes down to the hot region, steam comes up, is purified and used to drive turbines, which drive electric generators.
  • ...5 more annotations...
  • Advantages   Geothermal energy does not produce any pollution, and does not contribute to the greenhouse effect.
  • Once you've built a geothermal power station, the energy is almost free. It may need a little energy to run a pump, but this can be taken from the energy being generated.
  • The big problem is that there are not many places where you can build a geothermal power station. You need hot rocks of a suitable type, at a depth where we can drill down to them. The type of rock above is also important, it must be of a type that we can easily drill through.
  • Hazardous gases and minerals may come up from underground, and can be difficult to safely dispose of.
  • Is it renewable? Geothermal energy is renewable. The energy keeps on coming, as long as we don't pump too much cold water down and cool the rocks too much
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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

Inside story: Hot rocks and high hopes | The Economist - 0 views

www.economist.com/16909897

geothermal potential future

shared by dpurdy on 07 Nov 11 - Cached
  • Engineered geothermal systems (EGS) are based on a related principle, but they work even in parts of the world that are not volcanically active, by drilling thousands of metres underground to mimic the design of natural steam or hot-water reservoirs. Wells are bored and pathways are created inside hot rocks, into which cold water is injected. The water heats up as it circulates and is then brought back to the surface, where the heat is extracted to generate electricity. Because the Earth gets hotter the deeper you drill, EGS could expand the reach of geothermal power enormously and provide access to a virtually inexhaustible energy resource.
  • dpurdy on 07 Nov 11
     
    Future method is to drill very deep and inject water. THis will give us many more sites where we can develop geothermal energy.,
  • anonymous on 05 Oct 13
     
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dpurdy

File:World energy consumption by type 2006.png - Wikipedia, the free encyclopedia - 1 views

en.wikipedia.org/...y_consumption_by_type_2006.png

current

shared by dpurdy on 07 Nov 11 - No Cached
  • dpurdy on 07 Nov 11
     
    graphic showing current energy use by type of fuel.
  • anonymous on 05 Oct 13
     
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mattianic99

Solar energy - Wikipedia, the free encyclopedia - 3 views

en.wikipedia.org/...Solar_energy

shared by mattianic99 on 09 Mar 12 - Cached
  • Solar energy, radiant light and heat from the sun
  • radiant light and heat from the sun,
  • Solar energy, radiant light and heat from the sun, has been harnessed by humans since ancient times using a range of ever-evolving technologies. Solar energy technologies include solar heating, solar photovoltaics, solar thermal electricity, solar architecture and artificial photosynthesis, which can make considerable contributions to solving some of the most urgent energy problems the world now faces.[1] [2]
  • ...2 more annotations...
  • "the development of affordable, inexhaustible and clean solar energy technologies will have huge longer-term benefits. It will increase countries’ energy security through reliance on an indigenous, inexhaustible and mostly import-independent resource, enhance sustainability, reduce pollution, lower the costs of mitigating climate change, and keep fossil fuel prices lower than otherwise. These advantages are global.
  • Solar technologies are broadly characterized as either passive solar or active solar depending on the way they capture, convert and distribute solar energy. Active solar techniques include the use of photovoltaic panels and solar thermal collectors to harness the energy. Passive solar techniques include orienting a building to the Sun, selecting materials with favorable thermal mass or light dispersing properties, and designing spaces that naturally circulate air.
  • butlerlex99 on 11 Mar 13
     
    The technologies of solar energy.
  • dextereli99 on 11 Mar 13
     
    the advantages of solar energy for the world 
bakereli00

What are Biofuels? - 0 views

www.biofuelsassociation.com.au/...what-are-biofuels

biofuel form

shared by bakereli00 on 20 Sep 13 - No Cached
  • Biofuels are liquid fuels which have been derived from other materials such as waste plant and animal matter. There are two main types of biofuels – bioethanol and biodiesel. Bioethanol is used as a replacement for gasoline and biodiesel is used as a replacement for diesel.
levendosjoh99

The Energy Story - Chapter 14: Ocean Energy - 0 views

www.energyquest.ca.gov/...chapter14.html

tide history

shared by levendosjoh99 on 20 Sep 13 - Cached
  • Tidal energy has been used since about the 11th Century, when small dams were built along ocean estuaries and small streams. the tidal water behind these dams was used to turn water wheels to mill grains.
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.
nassiveradom00

Geothermal Energy | A Student's Guide to Global Climate Change | US EPA - 0 views

www.epa.gov/...geothermal.html

shared by nassiveradom00 on 23 Sep 13 - No Cached
  • Geothermal power plants, which use heat from deep inside the Earth to generate steam to make electricity. Geothermal heat pumps, which tap into heat close to the Earth's surface to heat water or provide heat for buildings.
  • At a geothermal power plant, wells are drilled 1 or 2 miles deep into the Earth to pump steam or hot water to the surface.
  • hot springs, geysers, or volcanic activity, because these are places where the Earth is particularly hot just below the surface.
  • ...3 more annotations...
  • Hot water is pumped from deep underground through a well under high pressure. When the water reaches the surface, the pressure is dropped, which causes the water to turn into steam. The steam spins a turbine, which is connected to a generator that produces electricity. The steam cools off in a cooling tower and condenses back to water. The cooled water is pumped back into the Earth to begin the process again.
  • Geothermal heat pumps can do all sorts of things—from heating and cooling homes to warming swimming pools.
  • heat by pumping water or a refrigerant (a special type of fluid) through pipes just below the Earth's surface, where the temperature is a constant 50 to 60°F.
nassiveradom00

Geothermal Energy Use on the Rise in U.S. | Fox News - 1 views

www.foxnews.com/...geothermal-energy-use-rise

geothermal

shared by nassiveradom00 on 23 Sep 13 - No Cached
  • Geothermal energy is essentially free heat that comes from under your feet,
  • Additionally, the generation of geothermal energy in the U.S. is enough to power over two million homes.
  • "The industry is growing now, because over the past decade both the federal and state government have put in place laws and policies to really promote clean energy".
kurishkri00

US Wind Energy Market Takes Off - 0 views

www.renewableenergyworld.com/...s-wind-energy-market-takes-off

wind

shared by kurishkri00 on 23 Sep 13 - No Cached
  • kurishkri00 on 23 Sep 13
     
    The U.S. wind energy industry is continuing to pay off for those who have invested in it, both in terms of power generated as well as manufacturing and jobs. This is according to a pair of studies the DOE has made public. More than 13 GW of wind energy capacity was added onto the U.S.
rascoekat00

Tidal Power Facts: Understanding How Tidal Energy Works | Sustainable Earth | Going Gre... - 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. 
geczyluk99

HowStuffWorks "Hydrogen Fuel Economy" - 0 views

auto.howstuffworks.com/...hydrogen-vehicle-benefit3.htm

hydrogen fuel economy fuel cell sustainable pollution

shared by geczyluk99 on 23 Sep 13 - No Cached
  • If hydrogen extraction is performed using electricity from a coal-driven power plant, it doesn't matter that the fuel cell doesn't pollute because the pollution occurred when the hydrogen was extracted. If hydrogen is to be a true nonpolluting power source, the electricity used to extract the hydrogen will need to be produced by a nonpolluting method such as solar power.
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.
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.
sokolkyl00

Towards a Just and Sustainable Solar Industry - Silicon Valley Toxics Coalition - 0 views

svtc.org/solar

solar sustainable

shared by sokolkyl00 on 24 Sep 13 - No Cached
  • Although solar panels provide clean energy while in use, a variety of factors during the manufacturing and disposal of these panels have the potential to greatly damage the environment.
  • The most commonly used solar panels are silicon-based panels that share many of the same materials and manufacturing processes as semiconductors. Solar panels have the potential to create an e-waste burden if the proper infrastructure is not developed before the first wave of panels begins to come down.
westkea00

Pelamis Wave Power - 0 views

www.pelamiswave.com/pelamis-technology

shared by westkea00 on 25 Sep 13 - No Cached
  • The Pelamis is an offshore wave energy converter that uses the motion of waves to generate electricity.
  • The machine operates in water depths greater than 50m and is typically installed 2-10km from the coast. The machine is rated at 750kW with a target capacity factor of 25-40 per cent, depending on the conditions at the chosen project site. On average one machine will provide sufficient power to meet the annual electricity demand of approximately 500 homes.
  • The Pelamis machine is made up of five tube sections linked by universal joints which allow flexing in two directions. The machine floats semi-submerged on the surface of the water and inherently faces into the direction of the waves. As waves pass down the length of the machine and the sections bend in the water, the movement is converted into electricity via hydraulic power take-off systems housed inside each joint of the machine tubes, and power is transmitted to shore using standard subsea cables and equipment.
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