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westkea00

Wave Energy technology produces both clean water and clean energy : TreeHugger - 0 views

www.treehugger.com/...an-water-and-clean-energy.html

shared by westkea00 on 25 Sep 13 - No Cached
  • nstead of generating electricity at sea and sending it to shore, a different kind of wave energy device is in the works in Australia, and it promises to deliver not only emissions-free electricity, but also emissions-free desalinated water.The technology, called CETO after a Greek sea goddess, is being developed by Carnegie Wave Energy Limited, and their upcoming 2MW pilot project near the Perth Wave Energy demo site will be the first wave powered desalination plant in world
westkea00

Pelamis Wave Power - 0 views

www.pelamiswave.com

shared by westkea00 on 25 Sep 13 - Cached
westkea00

Pelamis Wave Power - 0 views

www.pelamiswave.com/pelamis-technology

shared by westkea00 on 25 Sep 13 - No Cached
  • The Pelamis is an offshore wave energy converter that uses the motion of waves to generate electricity.
  • The machine operates in water depths greater than 50m and is typically installed 2-10km from the coast. The machine is rated at 750kW with a target capacity factor of 25-40 per cent, depending on the conditions at the chosen project site. On average one machine will provide sufficient power to meet the annual electricity demand of approximately 500 homes.
  • The Pelamis machine is made up of five tube sections linked by universal joints which allow flexing in two directions. The machine floats semi-submerged on the surface of the water and inherently faces into the direction of the waves. As waves pass down the length of the machine and the sections bend in the water, the movement is converted into electricity via hydraulic power take-off systems housed inside each joint of the machine tubes, and power is transmitted to shore using standard subsea cables and equipment.
westkea00

Wave Power - Energy from ocean surface waves - 1 views

www.alternative-energy-news.info/...wave-power

shared by westkea00 on 08 Mar 13 - No Cached
  • Wave energy is produced when electricity generators are placed on the surface of the ocean
  • Energy output is determined by wave height, wave speed, wavelength, and water density.
  • The energy provided is most often used in desalination plants, power plants and water pumps.
  • ...4 more annotations...
  • The energy provided is most often used in desalination plants, power plants and water pumps.
  • Just like wind mills and wind turbines that generate power and electricity from the wind, scientists are now working to generate power from the sea
  • Wave energy is among the impressive list of renewable energy resources that is being developed in the United States.
  • Ocean wave energy can be captured directly from surface waves. Blowing wind and pressure fluctuations below the surface are the main reasons for causing waves.
  • Noah Buckingham on 08 Mar 13
     
    Controlling factor of electric power.
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.  
westkea00

Voith | Wave power plants - 0 views

www.voith.com/...wave-power-plants-590.html

shared by westkea00 on 25 Sep 13 - No Cached
  • With this technology, sea water turbines do not come into contact with water
  • Instead, a column of air is set in motion which drives the machines. In detail, this works in the following manner: The waves spill into a hollow container which is open to the sea. This compresses and calms the air column in a so-called collector in a similar way to how an air pump works. The power plant "breathes" in and out. The pressure difference is then turned into rotary energy in a so-called Wells turbine (named after its inventor). This is in turn passed to a generator where electricity is produced. This means that the turbine has the air periodically flow through it from both sides, depending on whether the device is "breathing" in or out. Because of the special rotor geometry, there is no need to either periodically change the blade angles or the direction of rotation. If you consider the fact that an average of some 3 million waves break on to the coast every year, it is clear that only this simple turbine design can offer maximum reliability.
westkea00

Wave power: how it works | SmartPlanet - 0 views

www.smartplanet.com/...3769

shared by westkea00 on 25 Sep 13 - No Cached
  • What is wave power? Wave power is renewable energy derived from ocean waves. It is the kinetic energy of wind interacting with water and creating waves
  • Wave energy is generated by the wind
  • The best wave energy environments are along western coastlines because the largest, most consistent winds come from the west,
  • ...7 more annotations...
  • How does wave power work? Most of the energy comes from the rising and falling water level and requires exposure to the waves
  • There might never be a dominant technology for harnessing this power
  • because of the differences in potential wave energy sites throughout the world.
  • all ocean energy resources, including wave power, would combine to create energy 800 times more powerful than wind
  • Currently, wind is our biggest renewable energy source
  • What are the benefits of wave power? Because wave devices tend to be on the surface and don’t have propellers, as tidal power technologies do, some believe they will create less environmental damage than other renewable energy technologies,
  • There are advantages compared to wind in that the devices are smaller and don’t have the visual profile that wind turbines have.”
westkea00

An electrical approach to wave energy conversion - 0 views

www.sciencedirect.com/...S0960148105002120

shared by westkea00 on 25 Sep 13 - No Cached
  • Motions in nature, for example ocean waves, can play a significant role in tomorrow's electricity production, but the constructions require adaptations to its media. Engineers planning hydropower plants have always taken natural conditions, such as fall height, speed of flow, and geometry, as basic design parameters and constraints in the design
  • Extensive simulations of the wave energy concept are presented, along with results from the experimental setup of a multisided permanent magnet linear generator. The prototype is designed through systematic electromagnetic field calculations. The experimental results are used for the verification of measurements in the design process of future full-scale direct wave energy converters. The present paper, describes the energy conversion concept from a system perspective, and also discusses the economical and some environmental considerations for the project.
westkea00

Ocean Wave Energy Power Technology - History - 0 views

clean-future.com/...wave-power

shared by westkea00 on 06 Apr 13 - No Cached
  • Currently, numerous wave power plants (so called wave farms) have been implemented throughout the world. Many different organizations have designed various wave power systems that differ in size, cost, and effectiveness. A wave farm is a collection of wave power systems in order to create mass quantities of power. One example of a wave power plant is the Aguçadoura Wave Farm in Portugal from Pelamis Wave Power Ltd. It is the first wave farm ever established and produces 2.25 megawatts of power. It was completed in 2008. Other wave farms, with other companies involved, have been proposed.
  • Wave energy is about using the energy of ocean waves for producing electrical current. It is a renewable energy resource and often confused with Tidal Power.
  • Wave energy is considered a form of hydropower, although it is the wind blowing over the surface of the ocean causing waves. So in many ways, wave energy is also wind energy - with all the pros and cons.
  • ...3 more annotations...
  • In contrast to tidal power, ocean wave energy plants do not make use of the energy difference between high tide and low tide, but generating energy from continuous wave motion. So, wave energy generation is the conversion of the forces from the motion of waves into usable energy.
  • Wave power generation has been tested over the past century as an alternative energy source to fossil fuels to create electrical power, sea water desalinization, and reservoir pumping. Unfortunately, despite of all examinations and tests, the price for generating energy from ocean waves is still about twice as high as that of wind energy. Companies involved in wave energy generation hope to be able to cut 50% of the costs within the next couple of years.
  • During the 1970's gasoline crisis, wave power was pushed in order to be a good long term energy solution. Later, the energy crisis was resolved yet the leaps and bounds made in the innovation of wave power remained. Though there were not many wave power plants actually implemented, it has proven to be a benefit to modern resolutions with current power crises. Fuel prices are rising exponentially and the greenhouse effect is having potentially disastrous effects on the environment. There has never been more need for alternatives to fossil generated energy.
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
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.
westkea00

Waves - Photography by David Orias | Ecology Global Network - 0 views

www.ecology.com/...waves-david-orias

shared by westkea00 on 25 Sep 13 - No Cached
  • Waves are generated by low pressure weather systems sometimes thousands of miles from where they will break on the shore. Waves are born from high winds pushing the surface of the ocean
westkea00

Pelamis Wave Power - 0 views

www.pelamiswave.com/development-history

shared by westkea00 on 25 Sep 13 - No Cached
  • Since 1998, the Pelamis development programme has covered all aspects of the design from the fundamental concept refinement through to accelerated cycle testing of individual components for reliability.
  • During the first phase of Pelamis development prior to full-scale operations in 2004, extensive numerical modelling and analysis and a range of technology demonstration models at different scales were used to understand survival characteristics in extreme waves and verify the accuracy of our simulations
westkea00

Renewable Energy Sources (4) Wave energy | dnahtigal - 0 views

dnahtigal.wordpress.com/...e-energy-sources-4-wave-energy

shared by westkea00 on 25 Sep 13 - No Cached
  • Waves are caused by the action of winds on the sea. Waves can be many metres in height and contain a great deal of energy. This energy can be harnessed to drive turbines that generate electricity.
  • Wave energy collectors are of two main types. The first type directs waves into man-made channels, where the water passes through a turbine that generates electricity. The second type uses the up and down movement of a wave to push air
  • Wave energy can be harnessed in coastal areas, close to the shore. There has been one such device working on the island of Islay in Scotland since the early 1990s, producing 75kW of electricity.
westkea00

Energy Basics: Wave Energy - 0 views

www.eere.energy.gov/...wave_energy.html

shared by westkea00 on 12 Mar 13 - No Cached
  • Offshore Systems Offshore systems are situated in deep water, typically of more than 131 feet (40 meters). Sophisticated mechanisms—such as the Salter Duck—use the bobbing motion of the waves to power a pump that creates electricity. Other offshore devices use hoses connected to floats that ride the waves. The rise and fall of the float stretches and relaxes the hose, which pressurizes the water, which, in turn, rotates a turbine. Specially built seagoing vessels can also capture the energy of offshore waves. These floating platforms create electricity by funneling waves through internal turbines and then back into the sea. Onshore Systems Built along shorelines, onshore wave power systems extract the energy of breaking waves. Onshore system technologies include: Oscillating Water Columns: Oscillating water columns consist of a partially submerged concrete or steel structure that has an opening to the sea below the waterline. It encloses a column of air above a column of water. As waves enter the air column, they cause the water column to rise and fall. This alternately compresses and depressurizes the air column. As the wave retreats, the air is drawn back through the turbine as a result of the reduced air pressure on the ocean side of the turbine. Tapchans: Tapchans, or tapered channel systems, consist of a tapered channel that feeds into a reservoir constructed on cliffs above sea level. The narrowing of the channel causes the waves to increase in height as they move toward the cliff face. The waves spill over the walls of the channel into the reservoir, and the stored water is then fed through a turbine. Pendulor Devices: Pendulor wave-power devices consist of a rectangular box that is open to the sea at one end. A flap is hinged over the opening, and the action of the waves causes the flap to swing back and forth. The motion powers a hydraulic pump and a generator.
  • Wave energy technologies extract energy directly from surface waves or from pressure fluctuations below the surface. Renewable energy analysts believe there is enough energy in ocean waves to provide up to 2 terawatts of electricity. (A terawatt is equal to a trillion watts.)
westkea00

Advantages and Disadvantages Of Wave Energy - 0 views

www.conserve-energy-future.com/s_Disadvantages_WaveEnergy.php

shared by westkea00 on 25 Sep 13 - No Cached
  • Wave energy is as source of power that comes from the endless march of the waves as they roll into the shore then back out again. Humans harness this power along the coastal regions of the United States, Canada, Scotland, and Australia. Energy that comes from the waves in the ocean sounds like a boundless, harmless supply.
  • Advantages of Wave Energy 1. Renewable: The best thing about wave energy is that it will never run out. There will always be waves crashing upon the shores of nations, near the populated coastal regions. The waves flow back from the shore, but they always return. Unlike fossil fuels, which are running out, in some places in the world, just as quickly as people can discover them. Unlike ethanol, a corn product, waves are not limited by a season. They require no input from man to make their power, and they can always be counted on
  • Also unlike fossil fuels, creating power from waves creates no harmful byproducts such as gas, waste, and pollution. The energy from waves can be taken directly into electricity-producing machinery and used to power generators and power plants nearby. In today’s energy-powered world, a source of clean energy is hard to come by.
  • ...7 more annotations...
  • Another benefit to using this energy is its nearness to places that can use it. Lots of big cities and harbors are next to the ocean and can harness the power of the waves for their use. Coastal cities tend to be well-populated, so lots of people can get use from wave energy plants.
  • A final benefit is that there are a variety of ways to gather it. Current gathering methods range from installed power plant with hydro turbines to seafaring vessels equipped with massive structures that are laid into the sea to gather the wave energy.
  • The biggest advantages of wave power as against most of the other alternative energy sources is that it is easily predictable and can be used to calculate the amount that it can produce. The wave energy is consistent and proves much better than other sources which are dependent on wind or sun exposure.
  • The biggest disadvantage to getting your energy from the waves is location. Only power plants and towns near the ocean will benefit directly from it. Because of its source, wave energy is not a viable power source for everyone. Landlocked nations and cities far from the sea have to find alternate sources of power, so wave energy is not the clean energy solution for everyone.
  • As clean as wave energy is, it still creates hazards for some of the creatures near it. Large machines have to be put near and in the water to gather energy from the waves. These machines disturb the seafloor, change the habitat of near-shore creatures (like crabs and starfish) and create noise that disturbs the sea life around them. There is also a danger of toxic chemicals that are used on wave energy platforms spilling and polluting the water near them.
  • Another downside is that it disturbs commercial and private vessels. Power plants that gather wave energy have to be placed by the coastline to do their job, and they have to be near cities and other populated areas to be of much use to anybody. But these are places that are major thoroughfares for cargo ships, cruise ships, recreational vehicles and beach goers. All of these people and vessels will be disrupted by the installation of a wave energy gathering source. This means that government officials and private companies that want to invest in wave energy sources have to take into account and consider the needs of those they may be disturbing.
  • Wind power is highly dependent on wavelength i.e. wave speed, wave length, wavelength and water density. They require a consistent flow of powerful waves to generate significant amount of wave power. Some areas experience unreliable wave behavior and it becomes unpredictable to forecast accurate wave power and therefore cannot be trusted as reliable energy source.
bishophan00

Where Does Wind Power Come From? - 0 views

www.renewableenergyworld.com/...here-does-wind-power-come-from

wind

shared by bishophan00 on 25 Sep 13 - No Cached
  •  Wind power is an interesting renewable energy source as wind turbines can essentially be placed anywhere geographically where there is ample wind to turn the wind blades.
  • One thing that we haven't written about extensively on the MyEnergySolution.com blog is wind power.  Wind power is an interesting renewable energy source as wind turbines can essentially be placed anywhere geographically where there is ample wind to turn the wind blades.
  • o put this in context, an average U.S. household uses about 10 megawatt-hours (MWh) of electricity each year. One megawatt of installed wind energy from a single large turbine can generate from 2,400 to more than 3,000 MWh annually – enough to power about 250 homes.
bishophan00

Wind Power Information, Wind Power Facts - National Geographic - 1 views

environment.nationalgeographic.com/...wind-power-profile

wind form

shared by bishophan00 on 11 Mar 13 - No Cached
  • Wind is a clean source of renewable energy that produces no air or water pollution.
  • Wind is the movement of air from an area of high pressure to an area of low pressure. In fact, wind exists because the sun unevenly heats the surface of the Earth. As hot air rises, cooler air moves in to fill the void. As long as the sun shines, the wind will blow. And as long as the wind blows, people will harness it to power their lives.
  • The wind spins the blades, which turn a shaft connected to a generator that produces electricity. Other turbines work the same way, but the turbine is on a vertical axis and the blades look like a giant egg beater.
  • ...5 more annotations...
  • At the end of last year, global capacity was more than 70,000 megawatts.
  • And since the wind is free, operational costs are nearly zero once a turbine is erected.
  • Globally, generation more than quadrupled between 2000 and 2006.
  • n the energy-hungry United States, a single megawatt is enough electricity to power about 250 homes.
  • ndustry experts predict that if this pace of growth continues, by 2050 the answer to one third of the world's electricity needs will be found blowing in the wind.
  • barnardnat99 on 11 Mar 13
     
    where wind energy come from
  • conwayjam99 on 13 Mar 13
     
    ". At the end of last year, global capacity was more than 70,000 megawatts. In the energy-hungry United States, a single megawatt is enough electricity to power about 250 homes. "
tvedepai00

Wave Power - 1 views

www.climate-change-guide.com/wave-power.html

wave cost co2 sustainable

shared by tvedepai00 on 12 Mar 13 - No Cached
  • Wave power does not cause any greenhouse gases and is a form of renewable energy as we will simply never run out of waves.Even though equipment represents a considerable financial commitment, the fuel is free of charge and never limited by geopolitical borders. Finally, the damage to the natural environment is considered to be minimal and thus it will help stop climate change.
  • fieldingbry99 on 12 Mar 13
     
    "Wave power does not cause any greenhouse gases and is a form of renewable energy as we will simply never run out of waves. Even though equipment represents a considerable financial commitment, the fuel is free of charge and never limited by geopolitical borders. Finally, the damage to the natural environment is considered to be minimal and thus it will help stop climate change."
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