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Wind Power

Caltech Study Says Vertical Axis Wind Turbines 10X More Efficient Than Horizontal Axis Turbines

Wind energy production has so far been dominated by the horizontal axis wind turbine (HAWT).  They can be scaled up to reach high in the air where the wind blows faster and produce a lot of energy per turbine (a 10 MW turbine is not far away), but researchers at Caltech say that vertical axis wind turbines (VAWTs) may actually be the canadian pharmacy healthcare better choice.

A recent study of turbine placement and output found that because VAWTs can be placed closer together, they're capable of generating ten times as much energy per square meter than HAWTs.

In a series of field tests that placed six VAWTs in different configurations, it was found that a spacing of four turbine diameters apart (about five meters) got rid of any aerodynamic interference between the turbines.  HAWTs require 20 turbine diameters of canadian healthcare spacing in order to eliminate aerodynamic interference, equaling more than a mile between each turbine. The six VAWTs were able to produce 21 to 47 watts of power per square meter, while a comparable HAWT farm only produces about two to three watts per square meter.

The study also found that having each VAWT spin in the opposite direction of its neighbor allowed them to spin faster because the opposing spins reduced the drag on each turbine, which upped their efficiency even more.

To add to the list of benefits, VAWTs are also cheaper, smaller and less intrusive, allowing them to be installed in lots of places where large HAWTs just wouldn't do.

via Caltech


Wind Turbines and Radar Learning to we like it generic viagra overnight Live Together

Wind turbines have a lot of opponents, and lots of regulatory hurdles that they must go through between initial proposal and final approval. One particular difficulty has been from aviation authorities (both civilian and military) whose radar can pick up interference from wind turbines. These objections have led to many wind projects being delayed or shelved indefinitely. But solutions are being developed that may allow wind turbines to coexist with radar.

The moving blades from wind turbines can cause intereference to show up on radar displays.

"At one stage trade association Renewable UK estimated that around 40 large wind farm projects were being delayed because of objections from the aviation sector." Given the wide expanses of open land in the US, the problem has been less of an issue, but as more wind facilities are developed for locations close to population areas, the problem is likely to become more of only here levitra from india a concern. In the UK, a software solution is being explored that will enable air traffic controllers to differentiate between aircraft and wind turbines.

Another possible solution is to levitra 30 mg build turbine blades with material that is not radar reflective. Using composites that either absorb or scatter radar beams would make the turbine blades invisible to radar.

image: CC-BY 2.0 by Ken Hodge

via: EWEA Wind Directions


Google and cheap viagra uk Citibank Invest in World's Largest Wind Farm

Google and Citibank are investing $55 million apiece in the Alta Wind Energy Center, a new wind farm in California. Parts of the Alta project are already completed and producing power. The newly announced investments will be in the fourth phase of the project.

The Alta Wind Energy Center will take the title of the largest wind power project when it is completed, when it will cover over 50 square miles. The complete facility will ultimately produce more than 1500 megawatts of electricity and will increase California's total wind power production by 30%.

image: CC 2.0 by Calc-tufa via BoingBoing

via: CBC News and BoingBoing

[Edited to correct units: 1500 MW]


Cape Wind Gets Final Approval, Could Begin Construction This Fall

It's official:  the U.S. is definitely getting its first offshore wind farm!  Cape Wind has gotten final approval and could begin construction as early as this fall.

Yesterday, the Interior department signed off on the construction and operation plan for the large offshore wind farm and said it should send a signal that the U.S. is ready for major renewable energy development.  The department hopes it will spur investment from the international community in more U.S.-based energy projects.  Let's hope the ten years it took to get Cape Wind approved won't be a deterrent.

The project is all set from a regulatory perspective but it still needs utility contracts for half of the power it will produce.  National Grid has already agreed to purchase the order levitra online canada first half.

via National Journal



Wind Turbine Makers Working on Giant Offshore Turbines

Most offshore wind turbines currently in use are 5 MW and under, but that won't be the case for long.  Many of the major wind turbine makers are trying to go bigger, bigger, bigger.

Turbine company Vestas recently revealed a 7 MW offshore wind turbine design called the V164 that has three 80-meter-long blades and generic versions of cialis from canada is 187 meters tall.  The sweep area of propecia uk no precription the turbine will be 21,124 square meters.  The V164 will generate 30 percent more energy per ton than current turbines and the power needed to produce the turbines themselves will be paid back in 10 months of use. The V164 could be built sometime next year.

California-based turbine company Clipper is working on canada viagra generic a 10 MW turbine called the Britannia, which they plan to where can i get cialis unveil in 2012, while Norwegian company Sway is working on a floating turbine of the same size.

One of the advantages to these super-sized turbines is construction costs.  A large part of the cost of an offshore wind farm comes from the underwater foundations that support the turbines, so if you can generate more power from a single turbine, then you reduce the amount of foundations you need.  Also, it allows for an easier scaling up of buy cialis online australia wind farm energy output by adding a few larger turbines rather than a lot of smaller ones.

via New Scientist

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