Skip to main content

Home/ qmstech2/ Group items tagged and

Rss Feed Group items tagged

Filter: All | Bookmarks | Topics Simple Middle
rascoekat00

Tidal power - Wikipedia, the free encyclopedia - 1 views

en.wikipedia.org/...Tidal_power

tidal power history

shared by rascoekat00 on 03 Nov 11 - No Cached
  • The first tidal power station was the Rance tidal power plant built over a period of 6 years from 1960 to 1966 at La Rance, France.[8] It has 240 MW installed capacity.
  • Historically, tide mills have been used, both in Europe and on the Atlantic coast of North America. The incoming water was contained in large storage ponds, and as the tide went out, it turned waterwheels that used the mechanical power it produced to mill grain. [1] The earliest occurrences date from the Middle Ages, or even from Roman times.[2][3] It was only in the 19th century that the process of using falling water and spinning turbines to create electricity was introduced in the U.S. and Europe.[
  • Tides are more predictable than wind energy and solar power.
  • ...3 more annotations...
  • relatively high cost and limited availability of sites with sufficiently high tidal ranges or flow velocities, thus constricting its total availability. However, many recent technological developments and improvements, both in design (e.g. dynamic tidal power, tidal lagoons) and turbine technology (e.g. new axial turbines, cross flow turbines), indicate that the total availability of tidal power may be much higher than previously assumed
  • Tidal stream generator Main article: Tidal stream generator Tidal stream generators (or TSGs) make use of the kinetic energy of moving water to power turbines, in a similar way to wind turbines that use wind to power turbines. Some tidal generators can be built into the structures of existing bridges, involving virtually no aesthetic problems. Likewise, “tidal bridging” is a relatively new advancement that is gaining recognition as a more practical and beneficial way to generate tidal power. Blue Energy Canada is a company that is focused on building bridges to match today's demands. [9]
  • The first study of large scale tidal power plants was by the US Federal Power Commission in 1924 which if built would have been located in the northern border area of the US state of Maine and the south eastern border area of the Canadian province of New Brunswick, with various dams, powerhouses and ship locks enclosing the Bay of Fundy and Passamaquoddy Bay (note: see map in reference). Nothing came of the study and it is unknown whether Canada had been approached about the study by the US Federal Power Commission.[10] There was also a report on the international commission in April 1961 entitled " Investigation of the International Passamaquoddy Tidal Power Project" produced by both the US and Canadian Federal Governments.
crandallmad00

Tidal Energy : Advantages and Disadvantages - 0 views

www.ianswer4u.com/...dal-energy-advantages-and.html

tide wave

shared by crandallmad00 on 30 Sep 13 - No Cached
  • Advantages of Tidal Energy1)  It is an inexhaustible source of energy. 2)  Tidal energy is environment friendly energy and doesn't produce greenhouse gases. 3)  As 71% of Earth’s surface is covered by water, there is scope to generate this energy on large scale. 4)  We can predict the rise and fall of tides as they follow cyclic fashion. 5) Efficiency of tidal power is far greater as compared to coal, solar or wind energy. Its efficiency is around 80%. 6)  Although cost of construction of tidal power is high but maintenance costs are relatively low. 7)  Tidal Energy doesn’t require any kind of fuel to run. 8)  The life of tidal energy power plant is very long. 9)  The energy density of tidal energy is relatively higher than other renewable energy sources.
  • Disadvantages of Tidal Energy 1)  Cost of construction of tidal power plant is high. 2)  There are very few ideal locations for construction of plant and they too are localized to coastal regions only. 3)  Intensity of sea waves is unpredictable and there can be damage to power generation units. 4)  Influences aquatic life adversely and can disrupt migration of fish. 5)  The actual generation is for a short period of time. The tides only happen twice a day so electricity can be produced only for that time. 6)  Frozen sea, low or weak tides, straight shorelines, low tidal rise or fall are some of the obstructions. 7)  This technology is still not cost effective and more technological advancements are required to make it commercially viable. 8)  Usually the places where tidal energy is produced are far away from the places where it is consumed. This transmission is expensive and difficult. Tidal Energy is thus a clean source of energy and doesn’t require much land or other resources as in harnessing energy from other sources. However, the energy generated is not much as high and low tides occur only twice a day and continuous energy production is not possible.
  • crandallmad00 on 30 Sep 13
     
    Lets now discuss the advantages and
dpurdy

Wind Energy and the Environment - Energy Explained, Your Guide To Understanding Energy ... - 0 views

www.eia.gov/...index.cfm

wind pollution

shared by dpurdy on 11 Nov 12 - No Cached
  • They may also reduce the amount of electricity generated from fossil fuels and therefore reduce the amount of air pollution, carbon dioxide emissions, and water use of fossil fuel power plants.
  • Modern wind turbines are very large machines, and some people do not like their visual impact on the landscape. A few wind turbines have caught on fire, and some have leaked lubricating fluids, though this is relatively rare. Some people do not like the sound that wind turbine blades make. Some types of wind turbines and wind projects cause bird and bat deaths. These deaths may contribute to declines in species that are also being affected by other human-related impacts. Many birds are killed from collisions with vehicles and buildings, by house cats and hunters, and by pesticides. Their natural habitats may be altered or destroyed by human development and by the changes in the climate that most scientists believe are caused by greenhouse gases emissions from human activities (which wind energy use can help reduce).
  • Making the metals and other materials in wind turbines and the concrete for their foundations requires the use of energy, which may be from fossil fuels.
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.
jack wells

Wind power - sustainable power generation from wind farms across the globe - 0 views

www.bp.com/sectiongenericarticle.do

Wind sustainable

shared by jack wells on 11 Mar 13 - No Cached
  • Wind power is safe, clean and increasingly affordable – with the potential for production on a much larger scale.Government support is crucial in ensuring the expansion of wind power. We believe such support should be transitional and limited. In the US, there is continuing uncertainty over the renewal of the production tax credit, which provides incentives to invest in wind energy. We are working with other wind energy suppliers to make an effective case for wind energy generation and the renewal of the production tax credit.Wind farms can provide large volumes of electricity (sometimes at a lower cost than conventional power generation)
  • Wind power is safe, clean and increasingly affordable – with the potential for production on a much larger scale.Government support is crucial in ensuring the expansion of wind power. We believe such support should be transitional and limited. In the US, there is continuing uncertainty over the renewal of the production tax credit, which provides incentives to invest in wind energy. We are working with other wind energy suppliers to make an effective case for wind energy generation and the renewal of the production tax credit.Wind farms can provide large volumes of electricity (sometimes at a lower cost than conventional power generation) Wind energy and the environment While wind farms can be an attractive alternative energy offering, they can also stir debate. During the planning stage for each new wind farm we assess the potential social and environmental impacts.The impact on wildlife and habitat The impact of wind farms on local residentsNoise from wind turbinesShadow flicker Interference with communications signalsWe then take steps to manage any negative impacts through engineering design changes, technology and other elements.
  • Wind power is safe, clean and increasingly affordable – with the potential for production on a much larger scale.Government support is crucial in ensuring the expansion of wind power. We believe such support should be transitional and limited. In the US, there is continuing uncertainty over the renewal of the production tax credit, which provides incentives to invest in wind energy. We are working with other wind energy suppliers to make an effective case for wind energy generation and the renewal of the production tax credit.
dpurdy

Energy Report - Hydrogen - 1 views

www.window.state.tx.us/...h2.php

Fuel Cell history

shared by dpurdy on 15 Mar 12 - No Cached
  • Hydrogen is colorless, odorless, tasteless and non-toxic. It is a gas at temperatures above -423° F and is highly diffuse, having a density approximately 14 times less than that of air. Because it is buoyant and diffusive, hydrogen dissipates quickly in open areas and can move through small spaces, which makes it difficult to store. Hydrogen is flammable over a broad range of gas concentration (from 4 to 74 percent), although its lower flammability limit – that is, the lowest temperature and pressure at which it will combust – is higher than those for some common fuels such as gasoline, propane or diesel.1 Hydrogen has been described as “the fuel of the future.” On Earth, hydrogen is found in combination with other elements such as carbon (hydrocarbons), oxygen (water) and nitrogen (ammonia). Although hydrogen may sometimes be used as a fuel, it is most often used as an energy carrier, such as electricity, and not an energy source. To make hydrogen a usable, stand-alone fuel, it must be separated from these other elements by chemical, thermal or electrochemical processes.
  • History British scientist Henry Cavendish identified hydrogen as a distinct element in 1766. Subsequent experiments by British and French scientists resulted in the first flight of a hydrogen balloon and the discovery that applying electricity to water can produce hydrogen and oxygen.
  • In the 1960s, NASA space capsules used hydrogen fuel cells for onboard electric power, heat and water.
  • ...1 more annotation...
  • The U.S. Department of Energy (DOE) does not maintain comprehensive statistics in this area, but the various demonstration projects suggest that there are some hundreds of hydrogen fuel cell vehicles on the road in the U.S.
  • dpurdy on 15 Mar 12
     
    On Earth, hydrogen is found in combination with other elements such as carbon (hydrocarbons), oxygen (water) and nitrogen (ammonia). Although hydrogen may sometimes be used as a fuel, it is most often used as an energy carrier, such as electricity, and not an energy source. To make hydrogen a usable, stand-alone fuel, it must be separated from these other elements by chemical, thermal or electrochemical processes.
rutaspe99

Hydrogen Power and Fuel Cells - Renewable Energy World - 3 views

www.renewableenergyworld.com/...hydrogen

fuel cell

shared by rutaspe99 on 19 Mar 12 - Cached
  • Hydrogen Energy Hydrogen is the simplest element. An atom of hydrogen consists of only one proton and one electron. It's also the most plentiful element in the universe. Despite its simplicity and abundance, hydrogen doesn't occur naturally as a gas on the Earth - it's always combined with other elements. Water, for example, is a combination of hydrogen and oxygen (H2O).
  • Hydrogen Energy Hydrogen is the simplest element. An atom of hydrogen consists of only one proton and one electron. It's also the most plentiful element in the universe. Despite its simplicity and abundance, hydrogen doesn't occur naturally as a gas on the Earth - it's always combined with other elements. Water, for example, is a combination of hydrogen and oxygen (H2O). Hy
  • Hydrogen is also found in many organic compounds, notably the hydrocarbons that make up many of our fuels, such as gasoline, natural gas, methanol, and propane.
  • slentzkel99 on 22 Oct 12
     
    Hydrogen is also found in many organic compounds, notably the hydrocarbons that make up many of our fuels, such as gasoline, natural gas, methanol, and propane.
  • rutaspe99 on 12 Mar 13
     
    A fuel cell combines hydrogen and oxygen to produce electricity, heat, and water. 
dpurdy

The Hidden Cost of Fossil Fuels | Union of Concerned Scientists - 2 views

www.ucsusa.org/...the-hidden-cost-of-fossil.html

Fossil fuels pollution

shared by dpurdy on 19 Mar 12 - Cached
  • Fossil fuels—coal, oil, and natural gas—are America's primary source of energy, accounting for 85 percent of current US fuel use.
  • Many of the environmental problems our country faces today result from our fossil fuel dependence. These impacts include global warming, air quality deterioration, oil spills, and acid rain.
  • Over the last 150 years, burning fossil fuels has resulted in more than a 25 percent increase in the amount of carbon dioxide in our atmosphere.
  • ...8 more annotations...
  • limate scientists predict that if carbon dioxide levels continue to increase, the planet will become warmer in the next century.
  • Several important pollutants are produced by fossil fuel combustion: carbon monoxide, nitrogen oxides, sulfur oxides, and hydrocarbons. In addition, total suspended particulates contribute to air pollution, and nitrogen oxides and hydrocarbons can combine in the atmosphere to form tropospheric ozone, the major constituent of smog.
  • Finally, fossil fuel use also produces particulates, including dust, soot, smoke, and other suspended matter, which are respiratory irritants.
  • Oil spills, for example, leave waterways and their surrounding shores uninhabitable for some time.
  • Production, transportation, and use of oil can cause water pollution.
  • Sulfur oxides are produced by the oxidization of the available sulfur in a fuel. Utilities that use coal to generate electricity produce two-thirds of the nation's sulfur dioxide emissions. Nitrogen oxides and sulfur oxides are important constituents of acid rain
  • Hydrocarbons are emitted from human-made sources such as auto and truck exhaust, evaporation of gasoline and solvents, and petroleum refining.
  • Two oxides of nitrogen--nitrogen dioxide and nitric oxide--are formed in combustion. Nitrogen oxides appear as yellowish-brown clouds over many city skylines
  • dpurdy on 19 Mar 12
     
    The article we read in class. Use the summary we wrote or refer to this.
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.
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.
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.  
greenhan99

How is Biofuel Made - 0 views

www.agrabiofuels.com/howisbiofuelmade.html

biofuel convert

shared by greenhan99 on 08 Mar 13 - No Cached
  • Where does the first phase for biofuel production begin? The sun takes credit for the very first step in this process. The sun helps to grow crops and plants, which are then eventually used to produce biofuel. Biofuel is actually derived from biomass, which can come from gas, solid and liquid states.
  • These crops that are specifically grown to be used to produce biofuels are referred to as feedstocks. These feedstocks are the raw and unprocessed form that the bio fuel is derived from. Among the more common types of feedstocks and crops that are used for the production of biofuels are corn, sugar crops, and forests. In addition, even some of the byproducts of materials such as those that come from wood can be used in this process. These special byproducts are often converted to the liquid forms of biofuels, which include methanol and ethanol. With the ability to use these byproducts, production methods have gotten a lot less expensive since there is much less waste involved.
  • In addition, there are also certain natural oils that are also used to help produce this special type of fuel. For example, oil palm, soybean and algae are surprisingly capable of being burned directly in certain types of furnaces and engines and can also be blended with certain types of fuels or petroleum based fuels for a more powerful blended mixture.
  • ...2 more annotations...
  • Where does the first phase for biofuel production begin? The sun takes credit for the very first step in this process. The sun helps to grow crops and plants, which are then eventually used to produce biofuel. Biofuel is actually derived from biomass, which can come from gas, solid and liquid states.
  • Another means of producing biofuel that has proven to be especially efficient and cost effective is the conversion of vegetable oil to a burnable fuel that can be used with most types of engines.
sopranodan99

Wave & Tidal Energy Technology | Renewable Northwest Project - 0 views

www.rnp.org/...wave-tidal-energy-technology

wave current

shared by sopranodan99 on 22 Oct 12 - No Cached
  • Potential
  • Wave energy resources are best between 30º and 60º latitude in both hemispheres, and the potential tends to be the greatest on western coasts
  • While no commercial wave or tidal projects have yet been developed in the United States, several projects are planned for the near future, including projects in the Northwest
  • ...7 more annotations...
  • ‘Pelamis’ wave energy conversion devices and generates a combined 2.25 MW of electricity. OPD plans to expand the facility to produce 22.5 MW in 2007
  • The United States receives 2,100 terawatt-hours of incident wave energy along its coastlines each year, and tapping just one quarter of this potential could produce as much energy as the entire U.S. hydropower system.
  • Total Annual U.S. Incident Wave Energy 2,110 terrawatt-hours
  • The United States receives 2,100 terawatt-hours of incident wave energy along its coastlines each year, and tapping just one quarter of this potential could produce as much energy as the entire U.S. hydropower system
  • In addition to its abundant solar, wind and geothermal resources, the Pacific Northwest is also uniquely situated to capture the renewable energy of the ocean. Special buoys, turbines, and other technologies can capture the power of waves and tides and convert it into clean, pollution-free electricity. Like other renewable resources, both wave and tidal energy are variable in nature. Waves are produced by winds blowing across the surface of the ocean. However, because waves travel across the ocean, their arrival time at the wave power facility may be more predictable than wind. In contrast, tidal energy, which is driven by the gravitational pull of the moon and sun, is predictable centuries in advance.
  • The United States receives 2,100 terawatt-hours of incident wave energy along its coastlines each year, and tapping just one quarter of this potential could produce as much energy as the entire U.S. hydropower system
  • The Unit
  • mchughkon99 on 15 Mar 13
     
    the amount of 1/4 of energy around the coasts could be equal to the amount energy produced by hydropower
Connor Wiggins

HowStuffWorks "How Fuel Cells Work" - 0 views

auto.howstuffworks.com/...fuel-cell.htm

fuel cell sustainable

shared by Connor Wiggins on 15 Mar 12 - Cached
  • This initiative, supported by legislation in the Energy Policy Act of 2005 (EPACT 2005) and the Advanced Energy Initiative of 2006, aims to develop hydrogen, fuel cell and infrastructure technologies to make fuel-cell vehicles practical and cost-effective by 2020
  • Why are governments, private businesses and academic institutions collaborating to develop and produce them? Fuel cells generate electrical power quietly and efficiently, without pollution. Unlike power
  • that use fossil fuels, the by-products from an operating fuel cell are heat and water
  • ...5 more annotations...
  • With a fuel cell, chemicals constantly flow into the cell so it never goes dead -- as long as there is a flow of chemicals into the cell, the electricity flows out of the cell. Most fuel cells in use today use hydrogen and oxygen as the chemicals.
  • If you want to be technical about it, a fuel cell is an electrochemical energy conversion device. A fuel cell converts the chemicals hydrogen and oxygen into water, and in the process it produces electricity.
  • polymer electrolyte membrane fuel cells (PEMFC)
  • United States has dedicated more than one billion dollars to fuel cell research and development so far.So what exactly is a fuel cell,
  • With a fuel cell, chemicals constantly flow into the cell so it never goes dead -- as long as there is a flow of chemicals into the cell, the electricity flows out of the cell. Most fuel cells in use today use hydrogen and oxygen as the chemicals.
  • ricciardellinick on 08 Mar 13
     
    "In 2003, President Bush announced a program called the Hydrogen Fuel Initiative (HFI) during his State of the Union Address."
  • Connor Wiggins on 11 Mar 13
     
    It shows how its sustainable 
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
     
    Stay Online on the worldwide web on the worldwide web on the world wide web online on the world wide web online roulette from Modern contemporary modern sydney, Fun and Free! Now you is able of doing Real "www.funlivecasino.com.au" Stay Online on the worldwide web on the worldwide web on the world wide web online on the world wide web online roulette for Fun in Modern contemporary modern sydney on a product new web page, FunLiveCasino.com.au. Using the newest on the worldwide web working technology, Fun Stay Gambling house allows you be a factor of a genuine action occurring on a genuine desk in a genuine betting house, all approved on Live! You can see other real gamers in the betting house betting on the same outcomes you do providing you greatest believe in in the outcomes as they are not designed 'just for you a, like other action being affected by products such as 'live studios' or pc designed actions. Its awesome to think when your really in the betting house that you might be on digicam, and individuals on the worldwide web might be watching! The long run is scary! Believe one day soon this will be the only way individuals would bet on the worldwide web because the worldwide web is complete of fraudsters, you have to be extremely cautious, and why would you perform Online Online on the worldwide web on the worldwide web on the world wide web online on the world wide web online roulette any other way except from a Real Gambling house you can assess out, see, pay interest to and trust! Amazingly this web page is definitely 100 % 100 % 100 % 100 % 100 % 100 % 100 % free and has no determining upon up process, no junk, no pc bunny rabbit bunny rabbit rabbit mouse mouse clicks and no stress. Just Immediate Fun "www.funlivecasino.com.au" 100 % 100 % 100 % 100 % 100 % 100 % 100 % free Stay Roulette! Give it a try, its value verifying out! "www.funlivecasino.com.au" Australia's Online Fun Stay Casino! Backlink designed from http://fiverr.c
  • anonymous on 28 Sep 13
     
    Stay Online on the worldwide web on the worldwide web on the world wide web online on the world wide web online roulette from Modern contemporary modern sydney, Fun and Free! Now you is able of doing Real "www.funlivecasino.com.au" Stay Online on the worldwide web on the worldwide web on the world wide web online on the world wide web online roulette for Fun in Modern contemporary modern sydney on a product new web page, FunLiveCasino.com.au. Using the newest on the worldwide web working technology, Fun Stay Gambling house allows you be a factor of a genuine action occurring on a genuine desk in a genuine betting house, all approved on Live! You can see other real gamers in the betting house betting on the same outcomes you do providing you greatest believe in in the outcomes as they are not designed 'just for you a, like other action being affected by products such as 'live studios' or pc designed actions. Its awesome to think when your really in the betting house that you might be on digicam, and individuals on the worldwide web might be watching! The long run is scary! Believe one day soon this will be the only way individuals would bet on the worldwide web because the worldwide web is complete of fraudsters, you have to be extremely cautious, and why would you perform Online Online on the worldwide web on the worldwide web on the world wide web online on the world wide web online roulette any other way except from a Real Gambling house you can assess out, see, pay interest to and trust! Amazingly this web page is definitely 100 % 100 % 100 % 100 % 100 % 100 % 100 % free and has no determining upon up process, no junk, no pc bunny rabbit bunny rabbit rabbit mouse mouse clicks and no stress. Just Immediate Fun "www.funlivecasino.com.au" 100 % 100 % 100 % 100 % 100 % 100 % 100 % free Stay Roulette! Give it a try, its value verifying out! "www.funlivecasino.com.au" Australia's Online Fun Stay Casino! Backlink designed from http://fiverr.c
lefebvrekat99

BIOFUELS: What are they? How can they be used as an energy source (either on-...(Q&A) - 0 views

energyexperts.org/...ResourceDetail.aspx

biodiesel biofuels biofuel form

shared by lefebvrekat99 on 12 Mar 13 - No Cached
  • ofuels can be derived from almost any type of "biomass," a broad term that refers to living or recently alive biological material. Because biomass is produced on a short time scale, it is considered a renewable resource. I will describe types of biofuels—ethanol, biodiesel, syngas, bio-hydrogen, biogas, and solid biofuel—and their use. I'll also identify the crops and wastes being used to produce biofuels, and some issues surrounding biofuel production. How are biofuels being used? Biofuels are already used to supply a small fraction of our energy needs, with significant opportunities to expand their use as infrastructure is developed. In addition to ethanol and biodiesel for transportation, biofuels are currently used for power production, heating and cooling of buildings, and the thermal needs of industry. Biomass is today the largest non-hydroelectric renewable source for electricity produced in the U.S. Most of this is produced in pulp and paper mills, which often generate electricity by burning wood chips, bark, or the sludges and "liquors" that are byproducts of the paper-making process. At the same time, they recover waste heat from electricity generation to meet the thermal needs of the mill. This highly efficient combination is referred to as combined heat and power (CHP) or cogeneration. The electricity generated may be used onsite and/or supplied to the local utility for distribution to the public.
dylan purner

Energy Basics: Photovoltaics - 1 views

www.eere.energy.gov/...photovoltaics.html

solar history

shared by dylan purner on 08 Mar 13 - No Cached
  • First used in about 1890, "photovoltaic" has two parts: photo, derived from the Greek word for light, and volt, relating to electricity pioneer Alessandro Volta. And this is what photovoltaic materials and devices do—they convert light energy into electrical energy, as French physicist Edmond Becquerel discovered as early as 1839.
  • kenyonlau99 on 08 Mar 13
     
    "First used in about 1890, "photovoltaic" has two parts: photo, derived from the Greek word for light, and volt, relating to electricity pioneer Alessandro Volta. And this is what photovoltaic materials and devices do-they convert light energy into electrical energy, as French physicist Edmond Becquerel discovered as early as 1839. Becquerel discovered the process of using sunlight to produce an electric current in a solid material. But it took more than another century to truly understand this process. Scientists eventually learned that the photoelectric or photovoltaic effect caused certain materials to convert light energy into electrical energy at the atomic level. PV systems are already an important part of our daily lives. Simple PV systems provide power for small consumer items such as calculators and wristwatches. More complicated systems provide power for communications satellites, water pumps, and the lights, appliances, and machines in some homes and workplaces. Many road and traffic signs also are now powered by PV. In many cases, PV power is the least expensive form of electricity for these tasks."
rascoekat00

Energy Basics: Tidal Energy - 1 views

www.eere.energy.gov/...tidal_energy.html

tidal current

shared by rascoekat00 on 08 Mar 13 - No Cached
  • Tidal turbines look like wind turbines. They are arrayed underwater in rows, as in some wind farms. The turbines function best where coastal currents run between 3.6 and 4.9 knots (4 and 5.5 mph). In currents of that speed, a 49.2-foot (15-meter) diameter tidal turbine can generate as much energy as a 197-foot (60-meter) diameter wind turbine. Ideal locations for tidal turbine farms are close to shore in water 65.5–98.5 feet (20–30 meters) deep
  • In currents of that speed, a 49.2-foot (15-meter) diameter tidal turbine can generate as much energy as a 197-foot (60-meter) diameter wind turbine. Ideal locations for tidal turbine farms are close to shore in water 65.5–98.5 feet (20–30 meters) deep.
  • A barrage or dam is typically used to convert tidal energy into electricity by forcing water through turbines, which activate a generato
  • ...3 more annotations...
  • Some of the oldest ocean energy technologies use tidal power. All coastal areas experience two high tides and two low tides over a period of slightly more than 24 hours. For those tidal differences to be harnessed into electricity, the difference between high and low tides must be more than 16 feet (or at least 5 meters). However, there are only about 40 sites on Earth with tidal ranges of this magnitude.
  • Tidal Turbines Tidal turbines look like wind turbines. They are arrayed underwater in rows, as in some wind farms. The turbines function best where coastal currents run between 3.6 and 4.9 knots (4 and 5.5 mph). In currents of that speed, a 49.2-foot (15-meter) diameter tidal turbine can generate as much energy as a 197-foot (60-meter) diameter wind turbine. Ideal locations for tidal turbine farms are close to shore in water 65.5–98.5 feet (20–30 meters) deep.
  • Currently, there are no tidal power plants in the United States, but conditions are good for tidal power generation in the Pacific Northwest and the Atlantic Northeast regions.
  • albrechtjen99 on 08 Mar 13
     
    "Tidal Turbines Tidal turbines look like wind turbines. They are arrayed underwater in rows, as in some wind farms. The turbines function best where coastal currents run between 3.6 and 4.9 knots (4 and 5.5 mph). In currents of that speed, a 49.2-foot (15-meter) diameter tidal turbine can generate as much energy as a 197-foot (60-meter) diameter wind turbine. Ideal locations for tidal turbine farms are close to shore in water 65.5-98.5 feet (20-30 meters) deep."
  • kramerjac99 on 11 Mar 13
     
    where its used
  • butlerlei98 on 12 Mar 13
     
    "Some of the oldest ocean energy technologies use tidal power. All coastal areas experience two high tides and two low tides over a period of slightly more than 24 hours. For those tidal differences to be harnessed into electricity, the difference between high and low tides must be more than 16 feet (or at least 5 meters). However, there are only about 40 sites on Earth with tidal ranges of this magnitude."
dylan purner

Solar Photovoltaics | Solar Energy - 0 views

www.premierpower.com/...how_solar_works.php

solar form

shared by dylan purner on 08 Mar 13 - No Cached
  • What are photovoltaics? The word comes from “photo” (light) and “voltaic” (energy produced by a chemical reaction). Photovoltaic technology refers to the conversion of light into energy at the atomic level. Certain materials, such as silicon, cadmium, and selenium, have the ability to absorb light photons and release electrons. Solar photovoltaic technology harnesses these freed electrons and uses their electric current as DC electricity (NASA 2002). Fully powered by the sun, solar photovoltaics are a free, clean, and renewable source of energy that can be used independently of or in conjunction with conventional grid energy. Unlike solar thermal systems, solar energy panels require little maintenance, necessitate no moving parts, and last for 30-40 years.
  • kenyonlau99 on 08 Mar 13
     
    " Photovoltaics: The Science Behind Solar Energy           What are photovoltaics? The word comes from "photo" (light) and "voltaic" (energy produced by a chemical reaction). Photovoltaic technology refers to the conversion of light into energy at the atomic level. Certain materials, such as silicon, cadmium, and selenium, have the ability to absorb light photons and release electrons. Solar photovoltaic technology harnesses these freed electrons and uses their electric current as DC electricity (NASA 2002). Fully powered by the sun, solar photovoltaics are a free, clean, and renewable source of energy that can be used independently of or in conjunction with conventional grid energy."
deepat00

HowStuffWorks "How Does Geothermal Compare to Other Energy Sources? " - 0 views

science.howstuffworks.com/...geothermal-energy2.htm

geothermal fossil fuels

shared by deepat00 on 11 Mar 13 - No Cached
  • Because the energy is generated right near the plant, it saves on processing and transportation costs compared to other types of fuel.
  • The initial costs of geothermal energy are high -- wells can cost $1 to $4 million each to drill, and installation of a home geothermal pump system can run as much as $30,000
  • However, a home geothermal energy pump can cut energy bills by 30 to 40 percent and will pay for itself within 5 to 10 years
  • ...3 more annotations...
  • Geothermal energy is considered renewable because the heat is continually replaced. The water that is removed is put right back into the ground after its heat is used.
  • The initial costs of geothermal energy are high -- wells can cost $1 to $4 million each to drill, and installation of a home geothermal pump system can run as much as $30,000 [sources: REPP, Consumer Energy Center]. However, a home geothermal energy pump can cut energy bills by 30 to 40 percent and will pay for itself within 5 to 10 years [source: Consumer Energy Center].
  • about 2,700 megawatts of which is produced in the United States (the equivalent of burning 60 million barrels of oil each year)
  • vanierfel98 on 11 Mar 13
     
    Not having to pay for transportation can lower the overall cost of geothermal energy.
  • 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
« First ‹ Previous 41 - 60 of 554 Next › Last »
Showing 20▼ items per page