Blandade nyheter 2009-06-12

Blandade nyheter 2009-06-12

Inläggav KennethE 12 jun 2009 14:59

Wind Turbines Fear For Life: Scientists Say Wind Speeds Slowing Down
In the first study of its kind, two reserachers from the midwest are reporting that they are noticing a slowing of wind speeds in the US, particularly along and east of the Mississippi River, reports the Associated Press. With all of the hype around renewable energy, this isn't good news, ...


Endless sustainable power at the sea floor
"Benthic microbial fuel cell" is propeller-head code for the following very interesting fact: If you bury a metal plate a few centimeters beneath the ocean floor, and elevate a parallel plate a few centimeters above the ocean floor, the potential between them (due to ongoing microbial metabolism in the sediment) is enough to generate useful power. 800mV is a typical figure, but if I understand correctly, the current is directly related to the area of the plates, so the amount of power available by this method is theoretically only limited by the size of the plates you can install. Mark Nielsen is a doctoral candidate at Oregon State University under Dr. Clare Reimers, an expert in the field. This page at the OSU website provides a nice general overview of the concept and of Mark's work in particular.


How-To: Single rotor wind turbine
This instructable documents the process of my single rotor wind turbine. It is built with inspiration from Hugh Piggot and the folks at Otherpower.com. This is my first attempt at building a wind turbine, and I will try to include the mistakes I've made along the way so that other first-time builders can avoid them! Since this entire project has a budget of just about $1000, it is meant to be able to be completed by both newcomers to wind energy as well as those who don't have a lot of money to throw around. I also tried to use as much recycled material as possible, so a large portion of this turbine is made from a junked car and metal that was going to be thrown out by fabricators.
Lättjan är uppfinningarnas moder.
KennethE
 
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