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Renewable Solar Energy: How is Wind Formed - 0 views

renewable-solar-energy.blogspot.com/...how-wind-is-formed.html
shared by dynesbri97 on 13 Mar 12 - No Cached
  • Wind is formed by the indirect effect of the sun on the Earth’s surface. There is a reasonable explanation why is it so. As the sun shines, the Sun heats the Earth's surface; the air near ground level gets hot and rises up. Cold air at higher altitudes replaces it. At nighttime the process is reversed. This is  in principal how is wind formed on Earth.
  • This process of hot air rising and colder air sinking, causes high and low air pressure areas and results in wind formation. The more the pressure changes in an area, the faster the wind speed will be. If two areas are close to each other, pressure difference will cause higher wind speed to be produced compared to areas that are far apart from each other. This is how the wind is formed on Earth and this phenomena is known as vertical wind formation
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Distributed Energy Resources Guide: Fuel Cells - Cost - 3 views

www.energy.ca.gov/...cost.html hydrogen cost
shared by dpurdy on 12 Mar 12 - No Cached
  • Price projections vary among fuel cell developers, but most are targeting costs below $1,500/kW
  • Maintenance costs of a fuel cell are expected to be comparable to that of a microturbine, ranging from $0.005-$0.010/kWh (based on an annual inspection visit to the unit).
  • At the current price, units are only used in high value, "niche" markets where reliability is premium, and in areas where electricity prices are very high and natural gas prices are low.
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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
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Hydrogen Fuel - Energy from reacting hydrogen (H2) with oxygen - 1 views

www.alternative-energy-news.info/...hydrogen-fuel hydrogen fuel cells
shared by bartontri97 on 13 Mar 12 - Cached
    • bartontri97
      bartontri97 on 13 Mar 12
       
      use this pic 
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Hydrogen Basics - Fuel Cells - 1 views

www.fsec.ucf.edu/...fuelcells.htm fuel cell convert
shared by freedenjoh99 on 21 Mar 12 - No Cached
  • A fuel cell converts the chemical energy in hydrogen and oxygen into direct current electrical energy by electrochemical reactions. Fuel cells are devices that convert hydrogen gas directly into low-voltage, direct current electricity. The cell has no moving parts.
  • The process is essentially the reverse of the electrolytic method of splitting water into hydrogen and oxygen. In the fuel cell, the cathode terminal is positively charged and the anode terminal is negatively charged. These electrodes are separated by a membrane. Hydrogen gas is converted into electrons and protons (positive hydrogen ions) at the anode. The protons pass through the membrane to the cathode, leaving behind negatively charged electrons. This creates a flow of direct current electricity between the terminals when connected with an external circuit. This current can power an electric motor placed in this circuit. The hydrogen ions, electrons, and oxygen combine at the cathode to form water, the only byproduct of the process.
  • collignonaut99 on 11 Mar 13
     
    " 13kW PEM fuel cell (Photo: Ballard Power Systems, Inc.) The process is essentially the reverse of the electrolytic method of splitting water into hydrogen and oxygen. In the fuel cell, the cathode terminal is positively charged and the anode terminal is negatively charged. These electrodes are separated by a membrane. Hydrogen gas is converted into electrons and protons (positive hydrogen ions) at the anode. The protons pass through the membrane to the cathode, leaving behind negatively charged electrons. This creates a flow of direct current electricity between the terminals when connected with an external circuit. This current can power an electric motor placed in this circuit. The hydrogen ions, electrons, and oxygen combine at the cathode to form water, the only byproduct of the process"
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File:World energy consumption by type 2006.png - Wikimedia Commons - 3 views

commons.wikimedia.org/...y_consumption_by_type_2006.png current biofuel
shared by filionmar99 on 28 Mar 12 - No Cached
    • dpurdy
      dpurdy on 28 Mar 12
       
      Great graph on energy use in each area.
  • current
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http://www.hydrogen.energy.gov/pdfs/5011_h2_potential_solar_wind.pdf - 2 views

www.hydrogen.energy.gov/...11_h2_potential_solar_wind.pdf hydrogen potential solar
shared by dpurdy on 20 Jan 12 - No Cached
  • anonymous on 05 Oct 13
     
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Hydrogen Fuel Alternative - 1 views

www.alternative-energy-resources.net/hydrogenfuelalternative.html Hydrogen history what
shared by dpurdy on 03 Nov 11 - No Cached
  • Just as solar, hydro and biomass energy has been utilized for thousands of years, hydrogen technology as a fuel source has also been known for over 150 years.
  • Hydrogen is a simple element - an atom with only one proton and one electron. It is 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 is always combined with other elements.
  • Water, for example, is a combination of hydrogen and oxygen. Hydrogen can be separated from hydrocarbons by applying heat, a process known as "reforming" hydrogen.
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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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Energy Resources: Wind power - 0 views

home.clara.net/...wind.htm Wind location what how history
shared by dpurdy on 03 Nov 11 - Cached
  • The Sun heats our atmosphere unevenly, so some patches become warmer than others. These warm patches of air rise, other air blows in to replace them - and we feel a wind blowing. We can use the energy in the wind by building a tall tower, with a large propellor on the top. The wind blows the propellor round, which turns a generator to produce electricity.
  • he best places for wind farms are in coastal areas, at the tops of rounded hills, open plains and gaps in mountains - places where the wind is strong and reliable. Some are offshore.
  • The best places for wind farms are in coastal areas, at the tops of rounded hills, open plains and gaps in mountains - places where the wind is strong and reliable. Some are offshore.
  • ...4 more annotations...
  • Advantages Wind is free, wind farms need no fuel. Produces no waste or greenhouse gases. The land beneath can usually still be used for farming
  • Suitable areas for wind farms are often near the coast, where land is expensive.
  • Can be noisy. Wind generators have a reputation for making a constant, low, "swooshing" noise day and night, which can drive you nuts.
  • Wind power is renewable. Winds will keep on blowing, it makes sense to use them.
  • anonymous on 02 Oct 13
     
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NREL: Learning - Wind Energy Basics - 0 views

www.nrel.gov/...re_wind.html wind uses
shared by dpurdy on 03 Nov 11 - Cached
  • Applications These wind turbines near Lamar, Colorado, are part of the 162-MW Colorado Green Wind Farm. Each turbine produces 1.5 megawatts of electricity. Wind turbines can be used as stand-alone applications, or they can be connected to a utility power grid or even combined with a photovoltaic (solar cell) system. For utility-scale (megawatt-sized) sources of wind energy, a large number of wind turbines are usually built close together to form a wind plant. Several electricity providers today use wind plants to supply power to their customers.
  • anonymous on 02 Oct 13
     
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RenewableUK - Where Does Tidal Energy Come From? - 0 views

www.bwea.com/tides.html what Tide
shared by dpurdy on 03 Nov 11 - No Cached
  • Where Does Tidal Energy Come From? The gravitational force of the Earth stops the ocean from floating off into space, just like everything else. The Moon also has a very weak gravitational effect on the Earth, which is not normally noticable as far as falling teacups are concerned, but the ocean, which can flow around the globe to even out differences, is noticably affected.
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Connecting renewable energy to the grid - 2 views

www.abb.com/...f7a3a6aedc12577c20033dbf5.aspx grid solar wind transported
shared by dpurdy on 03 Nov 11 - No Cached
  • Big cities need large amounts of electricity to function. Often, this is transported from generating sites located in remote areas hundreds or even thousands of kilometers away. The question is how to move as much electricity as possible from renewable generation sites like hydro plants and wind parks without impairing the function of the power networks that need it.
  • One of the challenges of renewable power generation like wind and solar power is that it can be interrupted, and this variability affects the stability of the power produced
  • The "smart grid" will create a power network that is more reliable, flexible, secure and efficient
  • ...1 more annotation...
  • Power grids are facing a major transformation, driven by the need to integrate renewable energy
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World_energy_consumption_by_type_2006.png (763×277) - 4 views

upload.wikimedia.org/...y_consumption_by_type_2006.png world energy consumption fossil current
shared by dpurdy on 07 Nov 11 - No Cached
  • carrowluk99 on 22 Oct 12
     
    about 6.27% of energy is generated by hydrogen fuel cells
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Pun Alert: Geothermal Energy Gains Steam - 1 views

www.triplepundit.com/...-geothermal-energy-gains-steam geothermal current
shared by dpurdy on 07 Nov 11 - No Cached
    • dpurdy
      dpurdy on 07 Nov 11
       
      Graphic of current geothermal capacity
  • anonymous on 05 Oct 13
     
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Geothermal electricity - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/...Geothermal_electricity potential
shared by coonari98 on 07 Nov 11 - No Cached
  • Estimates of the electricity generating potential of geothermal energy vary from 35 to 2,000 GW.[2] Current worldwide installed capacity is 10,715 megawatts (MW), with the largest capacity in the United States (3,086 MW),[3] Philippines, and Indonesia.
  • coonari98 on 22 Oct 12
     
    " Dry steam plant Flash steam plant"
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Geothermal Energy Policy -- Energy Plan USA - 0 views

www.energyplanusa.com/geothermal_energy_plan.htm geothermal potential future
shared by dpurdy on 08 Nov 11 - No Cached
  • According to the government, geothermal has the potential to supply the United States with 20% of our electricity needs.
  • The capital cost of geothermal development is expensive, however; 2/3rds are drilling costs. Yet as we overcome some of these technology challenges and make the process more standardized it is believed that geothermal can supply up to 20% of the United States electricity needs by 2050. But innovation and investment in initial steps need to happen now.
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Solar Training, Solar Photovoltaic Training, Solar Installer Training, Renewable Energy... - 0 views

www.solarenergy.org
shared by gordonaus00 on 20 Sep 13 - Cached
  • APSA) program which will also include a second online course on battery-based PV systems and a 6 day hands-on photovoltaics workshop at the Earth University-La Flor in Liberia, Costa Rica.
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Definition of a Solar Cell - History of Solar Cells - 0 views

inventors.about.com/...solar_cell.htm solar
shared by charlesjos00 on 26 Sep 13 - Cached
  • A solar cell is any device that directly converts the energy in light into electrical energy through the process of photovoltaics. The development of solar cell technology begins with the 1839 research of French physicist Antoine-César Becquerel. Becquerel observed the photovoltaic effect while experimenting with a solid electrode in an electrolyte solution when he saw a voltage develope when light fell upon the electrode.
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Geothermal Basics - Environment - 0 views

geo-energy.org/geo_basics_environment.aspx geothermal pollution
shared by wooddan99 on 26 Sep 13 - No Cached
  • Unlike fossil fuel power plants, no smoke is emitted from geothermal power plants, because no burning takes place; only steam is emitted from geothermal facilities. Emissions of nitrous oxide, hydrogen sulfide, sulfur dioxide, particulate matter, and carbon dioxide are extremely low, especially when compared to fossil fuel emissions. The binary geothermal plant, which currently represents around 15% of all geothermal plant capacity, along with the flash/binary plant, produce nearly zero air emissions. Even dry steam plants, which are considered to have the highest levels of air emissions, are considered environmentally benign compared with fossil fuels. For example, Lake County, California, downwind of The Geysers, has met all federal and state ambient air quality standards for almost 25 years. There are 21 power plants at The Geysers, comprising a significant complex of electric generation facilities, yet even despite this, air quality is excellent. At The Geysers, air quality has even improved as a result of geothermal development because hydrogen sulfide, which would ordinarily be released naturally into the atmosphere by hot springs and fumaroles, instead now passes through an abatement system that reduces hydrogen sulfide emissions by 99.9%. (1) See also Myth #2.
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