Australia seems to be turning green. Last week they announced that they are making a massive solar power plant and now they’re making using wind to generate electricity. The wind farm will be the biggest one in the southern atmosphere.
“The wind farm would have the capacity to generate enough power for almost 190,000 homes every year, Victoria state planning minister Rob Hulls said of the 55 square kilometre (22 square mile) project to be built at Macarthur in the state’s west.”
Researchers at MIT have found a way to get wind turbines out of shallow water. Currently wind turbines in the ocean can only handle a depth of about 15 meters or less. Which means that people living on the shore have their view obstructed by them. This new wind turbine structure from MIT will allow turbines to be located far away from shore.
Paul D. Sclavounos, a professor of mechanical engineering and naval architecture, has spent decades designing and analyzing large floating structures for deep-sea oil and gas exploration. Observing the wind-farm controversies, he thought, “Wait a minute. Why can’t we simply take those windmills and put them on floaters and move them farther offshore, where there’s plenty of space and lots of wind?”
In 2004, he and his MIT colleagues teamed up with wind-turbine experts from the National Renewable Energy Laboratory (NREL) to integrate a wind turbine with a floater. Their design calls for a tension leg platform (TLP), a system in which long steel cables, or “tethers,” connect the corners of the platform to a concrete-block or other mooring system on the ocean floor. The platform and turbine are thus supported not by an expensive tower but by buoyancy. “And you don’t pay anything to be buoyant,” said Sclavounos.
According to their analyses, the floater-mounted turbines could work in water depths ranging from 30 to 200 meters. In the Northeast, for example, they could be 50 to 150 kilometers from shore. And the turbine atop each platform could be big–an economic advantage in the wind-farm business. The MIT-NREL design assumes a 5.0 megawatt (MW) experimental turbine now being developed by industry. (Onshore units are 1.5 MW, conventional offshore units, 3.6 MW.)
The tethers allow the floating platforms to move from side to side but not up and down–a remarkably stable arrangement. According to computer simulations, in hurricane conditions the floating platforms–each about 30 meters in diameter–would shift by one to two meters, and the bottom of the turbine blades would remain well above the peak of even the highest wave. The researchers are hoping to reduce the sideways motion still further by installing specially designed dampers similar to those used to steady the sway of skyscrapers during high winds and earthquakes.
It looks like the more things change the more they stay the same. A German company, SkySails, is going to start selling a new style of sail to help large freighters move through the ocean faster.
“SkySails’ system consists of an enormous towing kite and navigation software that can map the best route between two points for maximum wind efficiency. In development for more than four years, the system costs from roughly $380,000 to $3.2 million, depending on the size of the ship it’s pulling. SkySails claims it will save one third of fuel costs.”
The renewable energy sector is attracting a lot of investment recently, which is great to hear. This is good news because the forces of capitalism are working in favour of our environment. Here’s some great examples of all this renewed interest in renewable energy.
Great new technological development in solar power:
“CA-based Nanosolar had raised $100 million to finance a new solar-cell factory based on an inexpensive process, similar to that used to print newspapers, and that it will make enough cells to produce 430 megawatts of power annually, is just one sign that new types of solar power are emerging as a viable alternative energy source.”
Wind power is generating interest:
“The report says wind power is the world’s fastest-growing energy source with an average annual growth rate of 29 percent over the last ten years. In contrast, over the same time period, coal use has grown by 2.5 percent per year, nuclear power by 1.8 percent, natural gas by 2.5 percent, and oil by 1.7 percent. ”
There is more evidence that switching from non-renwable energy to renewable energy will help create jobs:
Tackling the green challenge can create Welsh jobs
2006 is looking to be a great year for improved energy technologies.