OK. I get the point … the idea behind it was for a heat exhaust system. like the ones the wind blows around or your roof. so the wind would provide some power also. the exhaust fan below would also help move the fan.
on non windy days yes eventually the power would run out but as soon as the wind started again you would have renewed power.
what do you think?
3. September 2010 at 1:54 pm
No. You can use a wind generator to power a fan, but the fan will not produce enough wind to drive the generator. What you describe is known as a perpetual motion machine
http://en.wikipedia.org/wiki/Perpetual_motion
3. September 2010 at 1:54 pm
no. this is because not all the energy from the fan will turn the wind generator. energy is lost. the energy input to the generator will always be greater than the output of the generator.
did that make sense?
3. September 2010 at 1:54 pm
Yes of course.
It will go for a while. (short while)
Hey nothing lasts forever, not even the solar system
The translation of your question
Can I make a perpetual movement?
This has been going on for a while, a long, long while.
In my books there is nothing impossible, there are only thing that are not realizable.
That usually is because we don’t have the resources. Mostly intellectual, meaning we don’t know how.
A hundred years ago, people were saying it was impossible to go to the moon!
Hope this properly answers your question
3. September 2010 at 1:54 pm
When you do work you lose energy..the Conservation of Energy law will eventually reduce input/output to zero….Sorry …but you can build a wind generator that will put out more energy than you use and sell the extra to the power company and buy a trip to the Alps where you won’t need a fan…:) If you get enough you can take me with you…Right? well have a good one….From the E
3. September 2010 at 1:54 pm
No the some of the force is lost.
3. September 2010 at 1:54 pm
Focus on capturing the wind energy and storing it in a usable form.
Now the big problem is storing that energy long-term and getting bigger energy density capacity.
3. September 2010 at 1:54 pm
All of the previous answers are correct or make useful points but I suspect that you are asking a slightly different question to the one that has been answered.
The air in a normal building gets hot and rises. If a hole is cut in the roof and an air-turbine is installed in the hole, it will be driven by the rising hot air. The turbine could drive a small alternator — the operative word is "small".
3. September 2010 at 1:54 pm
Any energy you stored while the wind was blowing would take away from the amount of energy that you had for moving the hot air you want moved in the first place.
As others have mentioned, you cannot build a perpetual motion machine, so it is not possible to have a wind generator (turbine) providing power to the exhaust fan, which provides wind for the wind generator.
Assuming the heat you want removed is from sunshine, a better solution is to combine solar power and an exhaust fan.