Less is more for more cost-efficient wind farms


posted by sooyup

No comments



* 01.jpg (18 KB. 530x298 - viewed 4 times.)


While there are increasing numbers of large wind farms being built around the 
world, many of these projects are underperforming and not producing as much 
power as expected. New research suggests the reason could be that the wind 
urbines are being placed too close together. The researchers say that spreading
 the turbines out will result in a more cost-efficient wind farms and they’ve come
 up with a formula through which the optimal spacing for a large array of turbines 
can be obtained.

The newest wind farms, be they on or offshore, typically use turbines with 
rotor diameters of around 300 feet (91 m), which are typically spaced about 
seven rotor diameters apart. Charles Meneveau, a fluid mechanicsand turbulence
 expert at Johns Hopkins University, working with Johan Meyers, an assistant 
professor at Katholieke Universiteit Leuven in Belgium, conducted research 
that indicates placing the wind turbines more than twice as far apart as current 
layouts – 15 rotor diameters apart – results in more cost-efficient power 
generation.

Meneveau says that earlier computational models for large wind farms – those consisting of hundreds or even thousands of turbines – were based on simply 
adding up what happens in the wakes of single wind turbines. However, his new 
spacing model takes into account the interaction of arrays of turbines with the
 entire atmospheric wind flow.

The researchers claim that the energy generated in a large wind farm has less
 to do with horizontal winds and is more dependent on the strong winds that 
the turbulence created by the tall turbines pulls down from higher up in the 
atmosphere. Using high-performance computer simulations and wind tunnel experiments, they determined that in the correct spacing, the turbines alter
 the landscape in a way that creates turbulence, which stirs up the air and helps
 draw more powerful kinetic energy from higher altitudes.

The study by Meneveau and Meyers was presented recently at a 
meeting of the American Physical Society Division of Fluid Dynamics. 
However,
 Meneveau says further research is needed to learn how varying temperatures 
can
 affect the generation of power on large turbines. He has applied for continued 
funding to conduct such studies

Leave a Reply

Related Posts Plugin for WordPress, Blogger...