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smithkai143

Kinetic energy - Wikipedia, the free encyclopedia - 0 views

  • The kinetic energy of an object is the energy which it possesses due to its motion.[1] It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body in decelerating from its current speed to a state of rest.
dpurdy

Photovoltaic power station - Wikipedia, the free encyclopedia - 0 views

  • A photovoltaic power station, also known as a solar park, is a large-scale photovoltaic system designed for the supply of merchant power into the electricity grid. They are differentiated from most building-mounted and other decentralised solar power applications because they supply power at the utility level, rather than to a local user or users. They are sometimes also referred to as solar farms or solar ranches, especially when sited in agricultural areas.
  • Most stations are sited within a few kilometres of a suitable grid connection point. This network needs to be capable of absorbing the output of the solar park when operating at its maximum capacity. The project developer will normally have to absorb the cost of providing powerlines to this point and making the connection; in addition often to any costs associated with upgrading the grid, so it can accommodate the output from the plant.
  • Income is therefore affected not only by the reliability of equipment within the plant, but also by the availability of the grid network to which it is exporting
dpurdy

BBC News - Wilburton giant solar farm connected to National Grid - 0 views

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    Video shows farm connected to grid. This shows the type of infrastructure that will need to be installed. 
dpurdy

Solar Electricity and how it works - Photovoltaic Systems and Components, Grid-Connecte... - 0 views

  • A valuable feature of photovoltaic systems is the ability to connect with the existing power grid which allows owners to sell excessive electricity back to the utility with a plan known as (5) Net Metering. At times when you are not using all of the electricity produced by your system, your meter will spin backwards selling the electricity back to the (6) utility power grid at retail rate.
  • (1) Solar Electric or PV modules convert sunlight to electricity. The PV modules generate DC electricity - or direct current - sending it to the inverter. (2) The inverter transforms the DC power into AC electricity for ordinary household needs. (3) Existing electrical panel distributes solar electricity and utility power to (4) loads (appliances). For systems with a battery backup (optional), the inverter also regulates the charge of batteries. The electricity stored in the batteries can be used at night or during blackouts.
    • dpurdy
       
      Great video showing solar cell (photovoltaic) in action.
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    Solar is not always connected to grid. Sometimes there are batteries, otherwise your system is connected to grid to share excess electricity.
dpurdy

Connecting renewable energy to the grid - 2 views

  • 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
dpurdy

MIT's artificial leaf is ten times more efficient than the real thing (Wired UK) - 0 views

  • The device is an advanced solar cell, no bigger than a typical playing card, which is left floating in a pool of water. Then, much like a natural leaf, it uses sunlight to split the water into its two core components, oxygen and hydrogen, which are stored in a fuel cell to be used when producing electricity.
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    This is an amazing breakthrough in developing hydrogen.
dpurdy

Hydrogen fuel - Wikipedia, the free encyclopedia - 0 views

  • Because pure hydrogen does not occur naturally, it takes energy to manufacture it. There are different ways to manufacture it, such as, electrolysis and steam-methane reforming process.
  • In electrolysis, electricity is run through water to separate the hydrogen and oxygen atoms. This method can be used by using wind, solar, geothermal, hydro, fossil fuels, biomass, and many other resources.
  • The more natural methods of making electricity (wind, solar, hydro, geothermal, biomass), rather than fossil fuels, would be better used as to continue the environment-friendly process of the fuel. Obtaining hydrogen from this process is being studied as a viable way to produce it domestically at a low cost. Steam-methane reforming process extracts the hydrogen from methane. However, this reaction causes a side production of carbon dioxide and carbon monoxide which are greenhouse gases and contribute to global warming.
ballardeth99

HowStuffWorks "Underwater Turbine Electricity Production" - 0 views

  • This produces the electricity that is carried by cable to shore.
  • Once it's plugged into an electrical grid, the electricity can be distributed [
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    "cable to shore. "
logansar99

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

  • 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.
smithree98

Fuel Cell Advantages and Disadvantages - 1 views

  • Conceptually, replacing the current oil-based infrastructure with hydrogen would cost billions, maybe trillions, of dollars. Although abundant in the universe, hydrogen is fairly rare in our atmosphere, meaning that it has to be extracted (for example through electrolysis, as explained above) and currently, the process is cost prohibitive and inefficient. Its production at energy plants creates excessive carbon dioxide. When it burns, a hydrogen flame is virtually invisible; coupled with the gas’s propensity for escaping, in small amounts, almost any tank, there are concerns about explosions. On the plus side, hydrogen is so light it typically is dispersed in the air very quickly. On-board storage is a major issue; a hydrogen tank would currently be too large for a car. It is a very flammable gas (think of the Hindenburg), which further adds to the on-board storage problems.
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    advantages and disadvantages of hydrogen fuel cells
giumarraant99

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

  • 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

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

  • 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.
logansar99

Ocean Energy - 0 views

  • The visual impact of a wave energy conversion facility depends on the type of device as well as its distance from shore
logansar99

EIA Renewable Energy-" Renewable Energy Consumption and Electricity Preliminary 2006 St... - 1 views

    • logansar99
       
      Wave energy isn't on this chart, so it's mainly experimental.
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    There is a graphic that shows we don't use much wave energy it's mainly experimental.
logansar99

Wave Energy - 2 views

  • northwestern coasts of the United States.
  • Positive or negative impacts on marine habitat (depending on the nature of additional submerged surfaces, above-water platforms, and changes in the seafloor);
  • Toxic releases from leaks or accidental spills of liquids used in those systems with working hydraulic fluids;
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  • Visual and noise impacts (device-specific, with considerable variability in visible freeboard height and noise generation above and below the water surface)
  • Conflict with other sea space users, such as commercial shipping and recreational boating;
  • Wave power varies considerably in different parts of the world, and wave energy can't be harnessed effectively everywhere
carrowluk99

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

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    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

  • 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

  • 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.
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    "The term photon (meaning "visible-light particle")"
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