Research: High-Altitude Wind Could Increase Global Power Output 100-Fold
September 10, 2012 2:04 PM
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Researchers estimate there's potential for 1,800 TW of wind power
Using advanced computer simulations, researchers at
Lawrence Livermore National Laboratory
Carnegie Mellon University
studied how much power could be feasibly extracted from atmospheric wind and what the effects on climate would be.
Many think that high-altitude wind
could offer dramatic cost savings over ground-based wind by tapping into powerful currents like the jet stream. Indeed the team, led by LLNL researcher
Professor Katherine Marvel
, found that while surface winds could only theoretically yield 400 terawatts of annual power production, high-altitude winds could yield up to 1,800 terawatts.
That's 100-times the current global power consumption of approximately 18 terawatts.
High-altitude winds could be captured by using gas-filled inflatables (or kites) with turbines mounted on them. One factor the team did not look at was price. Price remains an issue for high-altitude wind harvest,
-- the most convenient gas for floaters -- is growing scarce.
The current research focused more on the environmental impact. As wind turbines slow the air travelling over them, as they harvest its mechanical energy, they can have a climate impact. But the team estimates that if they were well distributed, even at 1,800 terawatts, the impact would only be a 0.1 degree Celsius change in temperatures and a 1 percent change in precipitation.
Researchers' models indicate that atmospheric wind harvesting may not have a serious adverse impact on the climate. [Image Source: Nature Climate Change]
This indicates that assuming costs can be worked out, high-altitude wind shouldn't have much of an adverse impact on the global climate. Of course, such models
are prone to error
, so it's best to take the study with a grain of salt.
The work, funded by the Carnegie Institution of Science, is
[abstract] in the peer-reviewed journal
Nature Climate Change
, CMU professor and the paper's senior author, comments [press release], "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."
Nature Climate Change
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RE: Incomplete study not worth mentioning
9/13/2012 6:52:37 PM
Including heating elements within the balloon material was well as the rotors and turbine housing would add a lot of weight and complexity. It would address this potential problem by increasing the likelihood that frequent maintenance would be necessary.
I don't think wind power is conducive to the central power generation and distribution model we currently use. It works better with smaller turbines providing supplemental power rather than being a primary source.
One idea that I was thinking might be worth trying is to use a stirling engine to supplement electricity generation of places that emit high amounts of heat as a by-product, such as a computer data center. Stirling engines work based on a temperature differential, so they could use the heat expelled by the HVAC system and convert some of the heat back into electricity.
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