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It's Not Easy to Move Electricity Through Salt Water

This might not seem like the most glamorous bit of the energy revolution, but cables are a big frikkin' deal. And though superconductors are pretty sexy, regular old conducting cables can get pretty fancy too. Particularly when they're under 300 to 1000 feet of salt water.

In this video Gavin Harper takes us on a little tour of how complex a wire really can be. First you have two layers of thin bundled steal cables to protect the cable from stresses. Obviously, the ocean can exert a massive amount of we use it mail order cialis mechanical energy, otherwise we wouldn't be building wave power plants at all.

The materials used to house and insulate the wires have to canadian viagra sales be changed as well. Since weight isn't a problem, but water-proofing is, heavy rubber is used to insulate the three copper conductors. Also included in the cable are fiber optic wires for communicating with the power-generating structures, be they tidal turbines, wave generators, or offshore wind turbines.

All-together, what once seemed like a pretty simple idea gets massively complicated. But it's just one more little step we've got to take toward a renewable future.

Filmed at EMEC - the European Marine Energy Centre, Orkney, UK,


Wave-Powered Boat Makes It from Japan to Hawaii

Back in February we talked about the online cialis prescriptions Suntory Mermaid II – a boat that encapsulates a pretty “duh” idea of powering a boat with waves. Well, creator Ken-ichi Horie and the boat have completed their goal journey of getting from Japan to Hawaii – a distance of 4,350 miles. It took nearly four months of going and average of 1.5 knots, but they made it. And set an I-Did-It-First record in the process.

The Suntory mermaid II uses the most advanced wave-power technology, with extra electricity coming from solar panels to run navigation lights. Since it is the most advanced, by virtue of being the only, it’s a great starting point for future wave-powered boats that go – I should hope – a little faster. Horie says the problem to be solved is how to keep the boat's speed up when the generic levitra waves are weak.

Maybe one day we’ll see a race between the Suntory Mermaid II and the Earthrace…and maybe an old-fashioned wind-powered sailboat thrown in for good measure.

Via EnvironmentalGraffiti, YachtPals, Physorg


East Coast Getting Tidal Energy Projects

Two fair-sized tidal energy projects are on their way to the east coast. First up is (ready for this mouthful?) the Edgartown-Nantucket Tidal Energy Plant Water Power Project. The project proposes 50 underwater turbines turned by the ebb and flow of tramadol 15 mg the tide. A 3 mile-long transmission line would carry the electricity generated to land, where it would be sold to local utilities. Edgartown and Nantucket would be the beneficiaries of the 2 MW of peak output.

The second project is planned for Vineyard Sound and it has a slightly more manageable title: The Cape and Islands Tidal Energy Project. This project is looking at clusters of underwater turbines – each with the ability to put out between 1 and 3 MW during peak tide – with up to 150 of these energy generators installed. The proposed turbines are on the scale of what was recently installed off Ireland, which is a 1.2 MW turbine and touted as the generic viagra super active plus world’s largest.

Right now the projects are doing research to see if this kind of output is possible, and if it can be done cheaply enough to make it viable. From what they can tell, the 1.5 meters-per-second average current speed probably won’t hack it to turn the turbines fast enough for them to create enough electricity to make the project worth while. It takes a current speed of about 2 meters-per-second to get that kind of energy generation going. Locals, and EcoGeeks, are eagerly awaiting more test results to find out if these projects could work.

Via CapeCodOnline, MVTimes


Honolulu to Air Condition Buildings with Seawater

A new green project called Honolulu Seawater Air Conditioning (HSWAC) proposes to cool down buildings with seawater, rather than fossil fuel-based air conditioning units, and it is getting some serious green to back it. Private investors have put up nearly $11 M, completing the funding effort for the $152 M project, with about half of the final funding coming from investors from Honolulu. Construction on the project is set to on line pharmacy australia cialis start the first week of January, 2009.

The system will pump cool water, about 45° F, from 1,600 feet below the real cialis ocean waves. The water will travel through the pump system to an onshore station where it will cool fresh water that circulates in a closed loop through customers’ buildings in downtown Honolulu. Once the cold seawater has done its job, it is pumped back into the ocean at a shallower level, going through a diffuser to ensure proper mixing and dilution to the surrounding sea. I’m curious as to the maintenance requirements of this system during and after storms, though apparently the creators know what they’re doing since the VP of Engineering at HSWAC and the President of the project’s management company, Renewable Energy Innovations, LLC, pioneered the system in Sweden and have shown that it works quite well.

I’m also curious as to what fuel is going to be used to power the buy levitra on-line system. Hopefully they’ll take a hint from the newly required solar-powered water heaters and go renewable with the system. Regardless, the savings potential is astounding. Honolulu depends on imported oil and fossil fuels for 90% of its electricity, so to use seawater instead would drop costs by over 20%. Building owners are pretty peppy about this savings, and the project has already committed over half of its 25,000 ton capacity to it's great! viagra buyviagra onlin future customers who have signed on, which even includes the Hawaiian Electric Company’s headquarters. It's a very good sign that there is so much enthusiasm behind the project from businesses and try it soft cialis government.

Via TreeHugger, Renewable Energy World; Photo via lrargerich


Rubber Anaconda Makes Wave Power Cheaper

Shark fins, kelp and whales have already been mimicked for tidal and wind power generation, and now anacondas get their time in the spotlight. Francis Farley, an experimental physicist, teamed up with Rod Rainey of Atkins Oil and Gas to invent a new device that harnesses wave power, but is made of inexpensive materials and is easy to maintain. They have named it the Anaconda because of the snake-like look.

The distensible rubber tube is closed at both ends and filled with water. One end faces the oncoming waves where the wave squeezes it and creates a bulge wave inside the buy canada in cialis tube. Bulge waves head down the tube, with the outside water accompanying it, pushing it along and enter site buy levitra online pharmacy causing the bulge wave to grow. Finally, the bulge wave flows past a turbine where energy is generated and fed to shore through a cable.

While only a prototype has been created so far, the inventors are getting back up from the University of Southampton, where lab experiments and studies will help the Anaconda scale up and become a reality. And by scale up, we mean big-time scale up. A fully grown Anaconda would be nearly 700 feet long and 23 feet in diameter, and would gather power from oceanic depths of female herbal cialis 130 to 330 feet. But the size is equivalent to its output. One unit could produce 1 megawatt. That’s a lot of power from a big snake. And because the goal is to keep it cheap and easy to maintain, the hope is that the cost of electricity from the snake would only be $0.12 per kWh – a competitive price. Still, it will be about 5 years of testing before we see if the Anaconda pans out. See the Anaconda swim here.

Via Treehugger, University of Southampton, GreenCarCongress

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