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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.
nassiveradom00

HowStuffWorks "How Geothermal Energy Works" - 0 views

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

shared by nassiveradom00 on 23 Sep 13 - No Cached
  • t's called geothermal energy -- from the Greek words geo, or "earth," and therme, meaning "heat."
  • The core, about 4,000 miles (6,437 kilometers) beneath the surface, can reach temperatures of 7,600 degrees Fahrenheit
  • (4,204 degrees Celsius).
  • ...2 more annotations...
  • Part of that heat is left over from the Earth's formation, about 4 billion years ago. The rest comes from the constant decay of radioactive isotopes inside the Earth.
  • ometimes that water escapes through cracks in the Earth to form pools of hot water (hot springs) or bursts of hot water and steam (geysers). The rest of the heated water remains in pools under the Earth's surface, called geothermal reservoirs.
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".
thibodeaueth00

Wave & Tidal Energy | Market | BioPower Systems - 0 views

www.biopowersystems.com/market.html

wave sustainable

shared by thibodeaueth00 on 23 Sep 13 - No Cached
  • The growth of the waves depends on the strength of the wind, its duration, and the open ocean distance (fetch) over which it blows
  • Ocean waves are created by surface winds.
rascoekat00

BBC News - UK tidal power has huge potential, say scientists - 0 views

www.bbc.co.uk/...science-environment-20983645

renewable tidal energy UK

shared by rascoekat00 on 23 Sep 13 - No Cached
  • Despite high costs, experts say tidal power is more reliable than wind.
  • The UK is underestimating the amount of electricity that could be generated from tidal sources, new research says.
  • rascoekat00 on 23 Sep 13
     
    Despite high costs, experts say tidal power is more reliable than wind.
aaronschr00

U.S. Takes Global Lead in Wind Energy Production | LiveScience - 1 views

www.livescience.com/ad-wind-energy-production.html

wind current

shared by aaronschr00 on 23 Sep 13 - No Cached
  • During the first half of 2008, the United States, for the first time, generated more wind energy electricity than Germany, despite the fact that the smaller European country still has more turbines than we do. Germany has enough turbines to collect about 22,000 to 23,000 megawatts of power, while the United States has a capacity of about 18,000 megawatts,
gaworeckilog99

First production hydrogen fuel cell cars hit the market, from Hyundai | ExtremeTech - 0 views

www.extremetech.com/...rs-hit-the-market-from-hyundai

fuel cell pollution

shared by gaworeckilog99 on 23 Sep 13 - No Cached
  • rather than burning hydrogen in place of gasoline as BMW has done with its internal combustion hydrogen cars. Either way, the only emission is water vapor.
kirkpatrickcon99

Articles about Solar Energy - Los Angeles Times - 0 views

articles.latimes.com/...solar-energy

cost sustainable current solar

shared by kirkpatrickcon99 on 23 Sep 13 - No Cached
  • with $25 million set aside for low-income customers. An additional $100.8 million will be used to swap out water heaters powered by electricity.
  • NATIONALHawaii sets 'breakthrough' framework for new solar power
pondalb98

How is wind energy converted into electrical energy - 0 views

wiki.answers.com/...nverted_into_electrical_energy

convert

shared by pondalb98 on 12 Mar 13 - No Cached
  • pondalb98 on 12 Mar 13
     
    the steps that convert your energy source into electricity
dpurdy

HowStuffWorks "How Fuel Cells Work" - 1 views

auto.howstuffworks.com/...fuel-cell1.htm

hydrogen future potential uses history

shared by dpurdy on 26 Oct 12 - Cached
  • The fuel cell will compete with many other energy­ conversion devices, including the gas turbine in your city's power plant, the gasoline engine in your car and the battery in your laptop. Combustion engines like the turbine and the gasoline engine burn fuels and use the pressure created by the expansion of the gases to do mechanical work. Batteries convert chemical energy back into electrical energy when needed. Fuel cells should do both tasks more efficiently.
  • Sir William Grove invented the first fuel cell in 1839. Grove knew that water could be split into hydrogen and oxygen by sending an electric current through it (a process called electrolysis). He hypothesized that by reversing the procedure you could produce electricity and water. He created a primitive fuel cell and called it a gas voltaic battery. After experimenting with his new invention, Grove proved his hypothesis. Fifty years later, scientists Ludwig Mond and Charles Langer coined the term fuel cell while attempting to build a practical model to produce electricity.
  • carrowluk99 on 26 Oct 12
     
    " Combustion engines like the turbine and the gasoline engine burn fuels and use the pressure created by the expansion of the gases to do mechanical work. Batteries convert chemical energy back into electrical energy when needed. Fuel cells should do both tasks more efficiently."
giumarraant99

NREL: Hydrogen and Fuel Cells Research - Renewable Electrolysis - 0 views

www.nrel.gov/...renew_electrolysis.html

use renewable sustainable hydrogen

shared by giumarraant99 on 24 Oct 12 - No Cached
  • Renewable electrolysis is a process that uses renewable electricity to produce hydrogen by passing an electrical current through water. Renewable energy sources such as photovoltaics, wind, biomass, hydropower, and geothermal can provide clean, sustainable electricity for our nation
  • Wind turbines can be used to produce hydrogen through a process called renewable electrolysis.
logansar99

BBC NEWS | Technology | Wave farms show energy potential - 1 views

news.bbc.co.uk/...6410839.stm

wave future change current

shared by logansar99 on 24 Oct 12 - Cached
  • Ocean waves carry tremendous power, and could, in theory at least, provide much of the world's electricity.
  • "What gives us tremendous hope with this technology is that our opening costs are substantially below where wind power started 20, 25 years ago."
  • Wind power has reduced its cost by 80% since, as the technology has been deployed and optimised, he says.
  • ...3 more annotations...
  • Ms Pontes says wave energy could someday supply 20% of Portugal's power.
  • "That's equal to about six-and-a-half percent of our total capacity in the United States, equal to all the dams that we have in the US right now."
  • The European Union has proposed a commitment to generate 20% of its energy from renewable sources by the year 2020.
logansar99

EERE News: DOE Reports Show Major Potential for Wave and Tidal Energy Production Near U... - 0 views

apps1.eere.energy.gov/...pa_id=664

wave potential

shared by logansar99 on 24 Oct 12 - No Cached
  • The United States uses about 4,000 terawatt hours (TWh) of electricity per year. DOE estimates that the maximum theoretical electric generation that could be produced from waves and tidal currents is approximately 1,420 TWh per year, approximately one-third of the nation's total annual electricity usage.
  • calculate the maximum kinetic energy available from waves and tides off U.S. coasts that could be used for future energy production, and which represent largely untapped opportunities for renewable energy development in the United States.
  • The West Coast, including Alaska and Hawaii, has especially high potential for wave energy development, while significant opportunities for wave energy also exist along the East Coast. Additionally, parts of both the West and East Coasts have strong tides that could be tapped to produce energy.
carrowluk99

Group items matching "hydrogen potential" in title, tags, annotations or url - qmstech2... - 0 views

groups.diigo.com/...search

fuel cells potential

shared by carrowluk99 on 24 Oct 12 - No Cached
  • carrowluk99 on 24 Oct 12
     
    if we fix our problems with price and how we make it hydrogen, we have the potential to generate all of our electrical need using fuel cells 
filionmar99

Group items matching "change future" in title, tags, annotations or url - qmstech2 | Di... - 0 views

groups.diigo.com/...search

biofuel future change

shared by filionmar99 on 24 Oct 12 - No Cached
  • We are working to produce biofuels that are low cost, low carbon, sustainable and able to fulfil the world’s transportation fuel needs on a large scale without compromising food production
espercla98

What is photon? - Definition from WhatIs.com - 1 views

whatis.techtarget.com/...photon

solar what form

shared by espercla98 on 24 Oct 12 - No Cached
  • Modern physicists have demonstrated that the energy in any electromagnetic field is made up of discrete packets. The term photon (meaning "visible-light particle") has been coined for these energy packets.
  • espercla98 on 24 Oct 12
     
    "The term photon (meaning "visible-light particle")"
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