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dpurdy

Energy Resources: Wave power - 1 views

home.clara.net/...wave.htm

wave pollution sustainable

shared by dpurdy on 03 Nov 11 - Cached
  • Ocean waves are caused by the wind as it blows across the sea. Waves are a powerful source of energy.
  • How it works There are several methods of getting energy from waves. 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.   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.
  • Once you've built a wave power station, the energy is free, needs no fuel and produces no waste or pollution.
  • ...4 more annotations...
  • Not expensive to operate and maintain.
  • 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.
  • Is it renewable? Wave power is renewable.
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 
bondycal00

Solar power - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/Solar_power

solar pollution cost co2 sustainable convert history form current

shared by bondycal00 on 20 Sep 13 - Cached
  • The Life-cycle greenhouse-gas emissions of solar power are in the range of 22 to 46  g/kWh depending on if solar thermal or solar PV is being analyzed, respectively. With this potentially being decreased to 15 g/kWh in the future.[71] For comparison (of weighted averages), a combined cycle gas-fired power plant emits some 400-599 g/kWh,
  • bondycal00 on 26 Sep 13
     
    Solar power is the conversion of sunlight into electricity, either directly using photovoltaics (PV), or indirectly using concentrated solar power (CSP). Concentrated solar power systems use lenses or mirrors and tracking systems to focus a large area of sunlight into a small beam. Photovoltaics convert light into electric current using the photoelectric effect.
gaworeckilog99

Fuel cell - Simple English Wikipedia, the free encyclopedia - 0 views

simple.wikipedia.org/...Fuel_cell

fuel cell co2

shared by gaworeckilog99 on 20 Sep 13 - No Cached
  • t has to be produced first, and if this is done by burning fossil fuels, it does not help against climate change. But, the hydrogen fuel cell will help against climate change in future, because scientists are trying to find new ways to make hydrogen without using fossil fuels.
frasercol99

Top 10 Sources for Biofuel : Discovery News - 0 views

news.discovery.com/...top-ten-sources-biofuel.htm

biofuel form

shared by frasercol99 on 20 Sep 13 - No Cached
  • Organic matter is one such source. Materials like corn and soybeans have oil extracts that can be converted to ethanol or biodiesel
  • more sustainable than petroleum, meaning they can be regrown and remain productive with less negative impact on our ecosystem.
  • Some biofuels that provide more long-term benefits may prove too expensive to pursue
  • ...5 more annotations...
  • Runge estimated that in the United States alone, some 1.3 billion tons of cellulose material could be harvested for biofuel use. Cellulose is basically fiber, and can be found in things ranging from switchgrass to trees such as hybrid poplar and willow.
  • 1. Cellulose
  • 2. Algal Oil
  • Because algae are grown in water, they overcome one of the major problems faced by other biofuels -- competition for land with agricultural crops.
  • 3. Corn
mannixjul00

What is Tidal Energy? | Renewable Green Energy Power - 0 views

www.renewablegreenenergypower.com/what-is-tidal-energy

tide renewable

shared by mannixjul00 on 23 Sep 13 - No Cached
  • It was used in the watermills along the shores of England during the Roman age and also used along the shores of France and Spain. This period was around 900 AD. The water rising from the tides was impounded in barrages and it was allowed to flow through waterwheels and other energy capturing devices thus capturing the energy and converting it into useful work used to grind grains and produce flour. The first tidal mill in the US was built in Salem, MA in 1635.
  • In recent history it was not until the 1960s that a tidal energy plant was built in France, on the estuary of La Rance, to capture the tidal energy and produce electricity. The plant has been operating for the past 50 or so years producing electricity without missing a tide. The second tidal energy plant was built about 20 years later in 1982 in Nova Scotia, Canada.
  • Water is much denser than air and this means that the tidal energy turbines would be much smaller than the wind energy turbines needed for the production of the same amount of electricity.
  • ...1 more annotation...
  • produced by the rise and fall of tides which occur in all parts of the world.
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

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.
westkea00

Pelamis Wave Power - 0 views

www.pelamiswave.com/development-history

shared by westkea00 on 25 Sep 13 - No Cached
  • Since 1998, the Pelamis development programme has covered all aspects of the design from the fundamental concept refinement through to accelerated cycle testing of individual components for reliability.
  • During the first phase of Pelamis development prior to full-scale operations in 2004, extensive numerical modelling and analysis and a range of technology demonstration models at different scales were used to understand survival characteristics in extreme waves and verify the accuracy of our simulations
westkea00

Renewable Energy Sources (4) Wave energy | dnahtigal - 0 views

dnahtigal.wordpress.com/...e-energy-sources-4-wave-energy

shared by westkea00 on 25 Sep 13 - No Cached
  • Waves are caused by the action of winds on the sea. Waves can be many metres in height and contain a great deal of energy. This energy can be harnessed to drive turbines that generate electricity.
  • Wave energy collectors are of two main types. The first type directs waves into man-made channels, where the water passes through a turbine that generates electricity. The second type uses the up and down movement of a wave to push air
  • Wave energy can be harnessed in coastal areas, close to the shore. There has been one such device working on the island of Islay in Scotland since the early 1990s, producing 75kW of electricity.
waiteric00

How much CO2 does solar energy produce? | Ecooutfitters.net - 0 views

www.ecooutfitters.net/...o2-emissions-with-solar-panels

co2

shared by waiteric00 on 23 Sep 13 - No Cached
  • Let’s not hide the fact that manufacturing solar panels requires resources, fossil fuels that release CO2 emissions and add to our carbon footprint. However, it’s been shown in numerous studies that solar panel production releases nowhere near as much CO2 and other greenhouse gases as electric generated from coal, oil, natural gas, etc. (And you still need to produce the equipment to generate electricity from those sources as well.)
dylan purner

HowStuffWorks "Photovolatic Cells: Converting Photons to Electrons" - 0 views

science.howstuffworks.com/...solar-cell1.htm

convert solar

shared by dylan purner on 24 Sep 13 - No Cached
  • Photovoltaic cells are made of special materials called semiconductors such as silicon, which is currently used most commonly. Basically, when light strikes the cell, a certain portion of it is absorbed within the semiconductor material. This means that the energy of the absorbed light is transferred to the semiconductor. The energy knocks electrons loose, allowing them to flow freely.
mattisonmar00

Renewables in Combination to Expand Coverage of Energy Need | The Energy Collective - 1 views

theenergycollective.com/...-fully-cover-energy-needs-2030

wind current

shared by mattisonmar00 on 24 Sep 13 - No Cached
  • In January 2012 the San Onofre nuclear power plant, which provided power to 1.4 million homes in Southern California
  • SCE went from having 50 percent of its energy production carbon-free in 2011 to 30 percent in 2012,
sokolkyl00

When Solar Becomes Cheaper Than Fossil Fuels | azizonomics - 0 views

azizonomics.com/...omes-cheaper-than-fossil-fuels

solar cost

shared by sokolkyl00 on 30 Sep 13 - No Cached
  • If the trend continues for another 8-10 years, which seems increasingly likely, solar will be as cheap as coal with the added benefit of zero carbon emissions. If the cost continues to fall over the next 20 years, solar costs will be half that of coal.
  • When applied to electricity prices this predicts that solar generated electricity in the US will descend to a level of 12 cents (7 pence) per kilowatt hour by 2020, possibly even 2015 for the sunniest parts of America.
charlesjos00

Photovoltaic Cells - 0 views

www.energyeducation.tx.gov/...c.html

picture solar photovoltaic

shared by charlesjos00 on 03 Oct 13 - No Cached
  • Photovoltaic cells are made of at least two layers of semiconducting material. The first layer has a positive charge; the next layer has a negative charge. When sunlight strikes the cell, the semiconducting material absorbs photons from the light. This process frees electrons from the negative layer, which move to the positive layer. This flow of electrons constitutes an electric current, which can be captured in a circuit connecting the two layers. The electricity generated by a photovoltaic cell can be used directly, stored in batteries or sold back to a utility company.
  • blackmerbru98 on 03 Oct 13
     
    yes but they will if you get enough of them they will outlast the fossil fuels but as this all burns out it can work as we will also by finding new planets we could find more and more fuels i expect this would . happen within a few decades of our time. as this might happen we could probably be able to live on other planets by then so when the sun actuly goes out we will be prepared
schmettererdav00

Electrical Power Generation from Biofuels - 0 views

www.mpoweruk.com/biofuels.htm

biofuel convert

shared by schmettererdav00 on 02 Oct 13 - No Cached
  • Generating plant fuelled by biomass uses conventional steam turbine electricity generating plant as used in coal fired power stations with modifications to the combustion chamber and fuel handling systems to handle the bulkier fuel.
  • anonymous on 03 Oct 13
     
    Comprehensive up-to-date news coverage, aggregated from sources all over theworld by Google News.‎Finance - ‎About Google News - ‎Languages and regions - ‎Editors' Pickswww.killdo.de.ggNews Online from Australia and the World ...News headlines from Australia and the world. The latest national, world, business, sport, entertainment and technology news from News Limited news papers.www.killdo.de.ggBreaking News Updates | Latest News Headlines ...Breaking News, Latest News and Current News from FOXNews.com. Breakingnews and video. Latest Current News: U.S., World, Entertainment, Health, ...www.killdo.de.gg
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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dpurdy

Hydrogen Basics | Fuel Cells 2000 - 0 views

www.fuelcells.org/...hydrogen-basics

hydrogen infrastructure

shared by dpurdy on 14 Nov 12 - No Cached
  • .  To store hydrogen in liquid form, hydrogen must be cooled to -423 °F, requiring a tremendous amount of energy.
  • Hydrogen vehicle fueling stations may generate hydrogen on-site or receive deliveries of trucked-in hydrogen.
  • Hydrogen’s energy density is 52,000 Btu/lb., which is three times greater than that of gasoline.
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