10 September 2012

Surface And Atmospheric Winds Can Meet All of the World's Energy Demand

Wind power uses the energy of the wind to generate energy. It can be harnessed to produce electricity, power mechanical machines, or used to move vehicles or objects.

One established and still emerging use for wind power is in the production of electricity. Wind farms are set up with hundreds of wind turbines that is connected to an electrical network. These are usually situated in places with frequent and consistent powerful winds. These grid of turbines are then used for commercial or residential power.

Wind farms are also used in conjunction with solar energy to provide power to isolated places that are not connected to an electrical network.

The largest capacity wind turbine is the Enercon E-126 with a rated capacity of 7.58 megawatts (MW). It is 198 meters high (650 ft) and has a diameter of 126 meters (413 ft). In terms of productivity, the most productive wind farm is the one in Rønland wind farm in Denmark. The four turbines in the farm generates 63.2 MW each.

Enough wind to power global energy demand

There is enough energy available in winds to meet all of the world's demand. Atmospheric turbines that convert steadier and faster high-altitude winds into energy could generate even more power than ground- and ocean-based units. New research from Carnegie's Ken Caldeira examines the limits of the amount of power that could be harvested from winds, as well as the effects high-altitude wind power could have on the climate as a whole. Their work is published September 9 by Nature Climate Change.

Led by Kate Marvel of Lawrence Livermore National Laboratory, who began this research at Carnegie, the team used models to quantify the amount of power that could be generated from both surface and atmospheric winds. Surface winds were defined as those that can be accessed by turbines supported by towers on land or rising out of the sea. High-altitude winds were defined as those that can be accessed by technology merging turbines and kites. The study looked only at the geophysical limitations of these techniques, not technical or economic factors.

Video: Wind Power

Turbines create drag, or resistance, which removes momentum from the winds and tends to slow them. As the number of wind turbines increase, the amount of energy that is extracted increases. But at some point, the winds would be slowed so much that adding more turbines will not generate more electricity. This study focused on finding the point at which energy extraction is highest.

Using models, the team was able to determine that more than 400 terrawatts of power could be extracted from surface winds and more than 1,800 terrawatts could be generated by winds extracted throughout the atmosphere.

Today, civilization uses about 18 TW of power. Near-surface winds could provide more than 20 times today's global power demand and wind turbines on kites could potentially capture 100 times the current global power demand.

At maximum levels of power extraction, there would be substantial climate effects to wind harvesting. But the study found that the climate effects of extracting wind energy at the level of current global demand would be small, as long as the turbines were spread out and not clustered in just a few regions. At the level of global energy demand, wind turbines might affect surface temperatures by about 0.1 degree Celsius and affect precipitation by about 1%. Overall, the environmental impacts would not be substantial.

"Looking at the big picture, it is more likely that economic, technological or political factors will determine the growth of wind power around the world, rather than geophysical limitations," Caldeira said.


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