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leonardsar99

How long has solar power been around? - Fort Smith Alternative Energy | Examiner.com - 0 views

www.examiner.com/...ng-has-solar-power-been-around

solar history

shared by leonardsar99 on 11 Mar 13 - No Cached
  • Using the sun's power has been around as early as the 7th century B.C. when people were using it to build fires. It is hypothesized that in 2nd century B.C. Archimedes used the reflective surfaces of bronze shields to burn ships invading Syracuse. However, it was not until 1973 when the Greek navy actually experimented with the notion and successfully burned a wooden ship at 50 meters. Sunrooms were common in houses and public buildings in the 6th century A.D. These were so common that "sun rights" were given to individuals. Swiss scientist Horace de Saussure was credited with building the world’s first solar collector in 1767. For a more descriptive timeline, this timeline lists the milestones in the historical development of solar technology from the 7th century B.C. up to today.
  • Using the sun's power has been around as early as the 7th century B.C. when people were using it to build fires. It is hypothesized that in 2nd century B.C. Archimedes used the reflective surfaces of bronze shields to burn ships invading Syracuse. However, it was not until 1973 when the Greek navy actually experimented with the notion and successfully burned a wooden ship at 50 meters. Sunrooms were common in houses and public buildings in the 6th century A.D. These were so common that "sun rights" were given to individuals. Swiss scientist Horace de Saussure was credited with building the world’s first solar collector in 1767. For a more descriptive timeline, this timeline lists the milestones in the historical development of solar technology from the 7th century B.C. up to today.
  • whalenkil98 on 11 Mar 13
     
    how long has solar energy been around?
barnardnat99

Energy Report: U.S. Wind Energy Production and Manufacturing Surges, Supporting Jobs an... - 0 views

www.doe.gov/...ing-surges-supporting-jobs-and

shared by barnardnat99 on 22 Mar 13 - No Cached
  • The report finds that in 2011, roughly 6,800 megawatts (MW) of new wind power capacity was added to the U.S. grid, a 31 percent increase from 2010 installations.  The United States’ wind power capacity reached 47,000 MW by the end of 2011 and has since grown to 50,000 MW, enough electricity to power 13 million homes annually or as many as in Nevada, Colorado, Wisconsin, Virginia, Alabama, and Connecticut combined. The country’s cumulative installed wind energy capacity grew 16 percent from 2010, and has increased more than18-fold since 2000.  The report also finds that six states now meet more than 10 percent of their total electricity needs with wind power.
dpurdy

HowStuffWorks "Mechanics of Hand-powered Generators" - 1 views

electronics.howstuffworks.com/...hand-powered-generators1.htm

fossil fuels convert

shared by dpurdy on 19 Mar 13 - No Cached
  • A generator is basically an electric motor working in reverse.
  • By spinning a coil of wire around a magnet, he found that he could create a steady current. Thus, he could convert energy used to spin the coil into electrical energy.
  • This principle powers generators that run on gasoline or diesel fuel, as well as the massive turbines in modern power plants, where the coils are turned by falling water or steam generated by burning coal or igniting nuclear reactions.
  • dpurdy on 19 Mar 13
     
    How a generator works
dpurdy

Wave Energy: an Overview (Oxfordshire Climate Exchange) - 1 views

climatex.org/...wave-energy-overview

wave potential future how form history

shared by dpurdy on 30 Oct 12 - No Cached
  • Waves are generated by winds blowing over the ocean surface.  Wave energy is effectively a stored and concentrated form of solar energy since the winds that produce them are caused by pressure differences in the atmosphere caused by the sun's differential heating of the earth's surface. Waves can efficiently transport energy for thousands of miles and retain their energy long after the winds that first created them have died down, which makes waves one of the most concentrated and consistent sources of renewable energy. 
  • Globally, the potential use of wave power is, unsurprisingly, limited to areas of the world where there are waves. On a global scale, this is dictated by global wind patterns, with the result that waves are more prevalent in the mid-latitudes (40-60(N/S), than nearer the equator where the lack of ocean wind is referred to as the 'doldrums'.  Interestingly, this potential for wave power contrasts with that of solar power, which is more effective in lower latitudes
    • dpurdy
      dpurdy on 30 Oct 12
       
      Location of wave power.
  • ...5 more annotations...
  • it is widely anticipated that other types of renewable resources, including wave energy, will need to be developed in order to meet more challenging targets beyond 2020. 
  • As with most renewable energy sources, wave devices have no emissions during generation but the energy associated with the construction of the device does have small associated emissions.
    • dpurdy
      dpurdy on 30 Oct 12
       
      What do we need to do in the future to make this work.
  • it is essential that the current demonstration schemes are successful, to reassure future investors. The most important objective is to deploy full-size demonstration schemes in order to gain greater confidence in the most developed technologies (as in the EU's Atlas project). 
  • it will be necessary to significantly improve the network connections to the electricity suppliers.
westkea00

Wave Power - 1 views

www.thinkglobalgreen.org/WAVEPOWER.html

shared by westkea00 on 30 Oct 12 - No Cached
  • The World Energy Council has estimated that approximately 2 terawatts (2 million megawatts), about double current world electricity production, could be produced from the oceans via wave power.
  • Wave energy is generally considered to be the most concentrated and least variable form of renewable energy. It is the high power density of wave energy that suggests it has the capacity to become the lowest cost renewable energy source.
  • Wave energy is a renewable, zero emission source of power
stanglebre99

Wind power - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/...Wind_power

wind history

shared by stanglebre99 on 22 Oct 12 - Cached
  • Sailboats and sailing ships have been using wind power for thousands of years, and architects have used wind-driven natural ventilation in buildings since similarly ancient times. The use of wind to provide mechanical power came somewhat later in antiquity. The windwheel of the Greek engineer Heron of Alexandria in the 1st century AD is the earliest known instance of using a wind-driven wheel to power a machine.[15][16].
sokolkyl00

Sustainable energy - Wikipedia, the free encyclopedia - 1 views

en.wikipedia.org/...Sustainable_energy

shared by sokolkyl00 on 22 Oct 12 - Cached
  • Sustainable energy is the sustainable provision of energy that meets the needs of the present without compromising the ability of future generations to meet their needs.
  • Sustainable energy is the sustainable provision of energy that meets the needs of the present without compromising the ability of future generations to meet their needs.
  • Sustainable energy is the sustainable provision of energy that meets the needs of the present without compromising the ability of future generations to meet their needs. Technologies that promote sustainable energy include renewable energy sources, such as hydroelectricity, solar energy, wind energy, wave power, geothermal energy, and tidal power, and also technologies designed to improve energy efficiency.
  • ...1 more annotation...
  • At this rate, many experts believe that solar energy is not efficient enough to be economically sustainable given the cost to produce the panels themselves.
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.
haguedav98

Geothermal Basics - Power Plant Costs - 1 views

geo-energy.org/geo_basics_plant_cost.aspx

geothermal power plant cost solar wind

shared by haguedav98 on 26 Oct 12 - No Cached
  • According to studies, an economically competitive geothermal power plant can cost as low as $3400 per kilowatt installed.
  • While the cost of a new geothermal power plant is higher than that of a comparable natural gas facility,
  • in the long run the two are similar over time. This is because natural gas construction costs account for only one third of the total price of the facility, while the cost of the fuel at a natural gas facility represents two thirds of the cost
dpurdy

http://ec.europa.eu/research/energy/pdf/hlg_vision_report_en.pdf - 1 views

ec.europa.eu/...hlg_vision_report_en.pdf

hydrogen uses future co2

shared by dpurdy on 26 Oct 12 - No Cached
    • slentzkel99
      slentzkel99 on 26 Oct 12
       
      Report on hydrogen economy potential 
  • dpurdy on 26 Oct 12
     
    Challenges Producing hydrogen in the large quantities necessary for the transport and stationary power markets could become a barrier to progress beyond the initial demonstration phase.  Uses: Fuel cells will be used in a wide range of products, ranging from very small fuel cells in portable devices such as mobile phones and laptops, through mobile applications like cars, delivery vehicles, buses and ships, to heat and power generators in stationary applications in the domestic and industrial sector. Future energy systems will also include improved conventional energy converters running on hydrogen (e.g. internal combustion engines, Stirling engines, and turbines) as well as other energy carriers (e.g. direct heat and electricity from renewable energy, and bio-fuels for transport). 
potterzac97

Solar vehicle - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/...Solar-charged_vehicle

potential solar

shared by potterzac97 on 15 Mar 12 - No Cached
  • Power density: Power from a solar array is limited by the size of the vehicle and area that can be exposed to sunlight. While energy can be accumulated in batteries to lower peak demand on the array and provide operation in sunless conditions, the battery adds weight and cost to the vehicle. The power limit can be mitigated by use of conventional electric cars supplied by solar (or other) power, recharging from the electrical grid.
efana1

Wind Power News - The New York Times - 0 views

topics.nytimes.com/...index.html

wind disadvantages advantages

shared by efana1 on 13 Mar 12 - Cached
  • It is popular because it is abundant and provides many communities with a clean, local source of electricity
  • wind power could account for 20 percent of the nation’s electricity supply by 2030
  • two main problems. First, the wind does not blow all the time, so there must be backup power plants
  • ...1 more annotation...
  • second problem with wind is that it sometimes blows the hardest in remote plains, far from cities that need the energy
dpurdy

How Much Solar Energy Can We Harvest? - 2 views

home.iprimus.com.au/...solen.html

solar potential future

shared by dpurdy on 20 Jan 12 - No Cached
  • The sun delivers about 7000 times more energy than we currently consume globally. However, we cannot cover the whole surface of the Earth with solar energy collectors. How much of this energy can we collect? Will it be enough to replace fossil fuels?
  • Our global consumption of electricity in 2005 was 15,182 TWh/y (see The Little Green Handbook). However, 9,541 TWh/y of electricity was produced by fossil fuels and 2,555 TWh/y by nuclear power, or the total 12,096 TWh/y. Assuming the lowest solar potential and the lowest efficiency of solar cells we can calculate that we could produce 35 times more electricity than produced by fossil fuels and nuclear power. The additional advantage is that solar power is clean and last practically forever.
  • Even if we used only 1% of unused land area we could produce nearly 4 times more electricity than we produce using fossil fuels and nuclear power.
  • anonymous on 05 Oct 13
     
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knightoli99

What Is Geothermal Energy? - 1 views

www.alternative-energy-resources.net/whatisgeothermalenergy.html

geothermal

shared by knightoli99 on 03 Nov 11 - No Cached
  • What is geothermal energy? Simply put, it is energy from the Earth. Geo refers to the solid part of the Earth and thermal refers to heat energy. Anywhere the Earth's surface is in close proximity to magma or volcanic activity under or near the Earth's surface, we can harness the energy.
  • knightoli99 on 15 Mar 13
     
    "What is geothermal energy? Simply put, it is energy from the Earth. Geo refers to the solid part of the Earth and thermal refers to heat energy. Anywhere the Earth's surface is in close proximity to magma or volcanic activity under or near the Earth's surface, we can harness the energy. According to the Department of Energy,"Geothermal energy technologies use the heat of the earth for direct-use applications, geothermal heat pumps, and electrical power production. Resources of geothermal energy range from the shallow ground to hot water and hot rock found a few miles beneath the Earth's surface and down even deeper to the extremely high temperatures of molten rock called magma. Three power plant technologies are being used to convert hydrothermal fluids to electricity. The type of conversion used depends on whether the fluid is steam or water and its temperature."
dpurdy

Wind Program: Advantages and Challenges of Wind Energy - 1 views

www1.eere.energy.gov/...wind_ad.html

Wind pollution future challenges

shared by dpurdy on 03 Nov 11 - No Cached
  • Challenges Wind power must compete with conventional generation sources on a cost basis. Depending on how energetic a wind site is, the wind farm may or may not be cost competitive. Even though the cost of wind power has decreased dramatically in the past 10 years, the technology requires a higher initial investment than fossil-fueled generators. Good wind sites are often located in remote locations, far from cities where the electricity is needed. Transmission lines must be built to bring the electricity from the wind farm to the city. Wind resource development may compete with other uses for the land and those alternative uses may be more highly valued than electricity generation. Although wind power plants have relatively little impact on the environment compared to other conventional power plants, there is some concern over the noise produced by the rotor blades, aesthetic (visual) impacts, and sometimes birds have been killed by flying into the rotors. Most of these problems have been resolved or greatly reduced through technological development or by properly siting wind plants.
  • anonymous on 02 Oct 13
     
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dpurdy

EIA Energy Kids - Hydropower - 1 views

www.eia.gov/...energy.cfm

what how location

shared by dpurdy on 03 Nov 11 - No Cached
  • Tides are caused by the gravitational pull of the moon and sun, and the rotation of the Earth. Near shore, water levels can vary up to 40 feet due to tides. Dam of the Tidal Power Plant on the Estuary of the Rance River, Bretagne, France Source: Stock photography (copyrighted) Tidal power is more predictable than wind energy and solar power. A large enough tidal range — 10 feet — is needed to produce tidal energy economically.
  • The United States has no tidal plants and only a few sites where tidal energy could be produced economically. France, England, Canada, and Russia have much more potential to use this type of energy.
  • Tidal turbines are basically wind turbines in the water that can be located anywhere there is strong tidal flow. Because water is about 800 times denser than air, tidal turbines have to be much sturdier than wind turbines. Tidal turbines are heavier and more expensive to build but capture more energy.
  • ...2 more annotations...
  • Waves are caused by the wind blowing over the surface of the ocean. There is tremendous energy in the ocean waves. It's estimated that the total potential off the coasts of the United States is 252 billion kilowatthours a year, about 6% of the United States' electricity consumption in 2010. The west coasts of the United States and Europe and the coasts of Japan and New Zealand are good sites for harnessing wave energy.
  • Many more ways to capture wave energy are currently under development. Some of these devices being developed are placed underwater, anchored to the ocean floor, while others ride on top of the waves. The world's first commercial wave farm using one such technology opened in 2008 at the Aguçadora Wave Park in Portugal.
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dpurdy

PowerPedia:Solar Energy - PESWiki - 2 views

peswiki.com/...PowerPedia:Solar_Energy

solar pollution location grid

shared by dpurdy on 03 Nov 11 - No Cached
  • Solar power is pollution free during use. Production end wastes and emissions are manageable using existing pollution controls.
  • In situations where connection to the electricity grid is difficult, costly, or impossible (such as island communities, areas not served by a power grid, illuminated roadside signs, and ocean-going vessels) harvesting solar power is often an economically competitive alternative to energy from traditional source
  • Intermittency: It is not available at night and is reduced when there is cloud cover, decreasing the reliability of peak output performance or requiring a means of energy storage.
  • ...1 more annotation...
  • Locations at high latitudes or with frequent substantial cloud cover offer reduced potential for solar power use.
  • anonymous on 02 Oct 13
     
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charlesjos00

How Solar Works in 4 Steps « Energy4Home - 0 views

blogs.constellation.com/...how-solar-works-in-4-steps

solar steps convert

shared by charlesjos00 on 27 Sep 13 - No Cached
  • 1) Individual silicon based (most commonly) cells called photovoltaics (PV) make up the modern day solar panel. These PV cell clusters perform the task of converting incoming sunlight directly into electricity. 2) Wires attached to the panels transport the converted electricity to a piece of equipment called an inverter. The job of the inverter is to convert the solar generated Direct Current (DC) electricity into the type of power your home can use, which is called Alternating Current (AC). 3) After the electricity travels through the inverter, the AC electricity is then transported via wire to your breaker panel to meet your home’s electric demands. 4) The process doesn’t end there, though. There are times when your panels will generate more power than you consume and times when you aren’t generating enough electricity (night times and periods of low light). When your panels are not generating enough solar electricity, you will continue to get power from your local utility. However, when you’re generating a surplus of solar electricity, that excess clean energy will be “net metered” to your local utility grid and you may earn a credit on your power bill for that net metered electricity.
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.
kurishkri00

About Wind Energy - 0 views

www.masscec.com/...wind-energy

wind form

shared by kurishkri00 on 23 Sep 13 - No Cached
  • kurishkri00 on 23 Sep 13
     
    Wind turbines harness wind energy to produce electricity that can be used to power homes and businesses across the Commonwealth. Wind power systems range from small turbines that power a single home or business to large, multi-turbine wind farms that feed into the grid and generate enough electricity to power thousands of Massachusetts homes.
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