BuildaWindMill.net

Alright, we cannot drill, we cannot have nuclear power.

I wish I could take a leak into my car and make it run, but the technology is not there right now.
How long before we can make semi-trucks and airplanes that can run on renewable energy?

I’ve seen these vehicles with 30 batteries on them, but they can hold no more than a suitcase (if they have a trunk at all) and the waste from the batteries is more toxic than gasoline emissions. By they way, they cannot run at freeway speeds.

Most experts I’ve read are reluctant to even give a time table, since less than 1% of our total energy now comes from renewables. Richard Heinberg, author of "The Party’s Over," has this to say:

“An analysis of the current energy alternatives is not reassuring. Solar and wind are renewable, but we now get less than one percent of our national energy budget from them; rapid growth will be necessary if they are to replace even a significant fraction of the energy shortfall from post-peak oil. Nuclear power is dogged by the unsolved problem of radioactive waste disposal. Hydrogen is not an energy source at all, but an energy carrier: it takes more energy to produce a given quantity of hydrogen than the hydrogen itself will yield. Moreover, nearly all commercially produced hydrogen now comes from natural gas–whose production will peak only a few years after oil begins its historic decline.”

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I want to work on renewable energy specifically building science and renewable energy stores like sell solar VP.solar thermal,hydro,batteries,pumps,etc… but in building science I have to install those products so what should I study,which career fit better?

electrical, cuz you would build them and i think that would be more fun to discover them then install them.

I want to make a small windmill that produces lots of energy at high wind speeds.

Here is a link to one;
http://www.fastonline.org/CD3WD_40/JF/JF_OTHER/SMALL/Pico%20turbine%20plan10B.pdf

Another similar one.
Nice photos also.
http://www.fieldlines.com/story/2009/4/4/214533/4539

This is interesting.
http://www.windstuffnow.com/main/alt_from_scratch.htm

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as far as i know, a windmill can only contain a generator, which converts mechanical energy to electrical energy. And the definition of motor is a device that converts electrical energy to mechanical energy.

As one answer said, to get the blades started turning.

You can also use a motor to turn the tower to face the wind.

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*It can also mean the kind of renewable energy that is most seriously being developed.

Solar and wind, both are easy to tap into and bountiful. Read more on this topic at the Pacific Crest Transformers website. I’m sure it will be very educative.

I need to find a graph or date showing how much renewable energy the states of Australia uses, for example Darwin – 38%

Please help, been looking for ages

Hi Dear,
Fossil fuel products dominate Australian energy consumption and this will remain the situation for the foreseeable future. Australia’s dependence on fossil fuels is heightened by the fact that electricity is largely produced in coal-fired power stations; approximately 84% of electricity for Australian homes and industry comes from coal and 12% from renewables, mainly hydroelectricity.

No. Your washing machine AC motor does not act as a generator. You can however use a car alternator and batteries for storage. Connect this to an inverter for AC power. I helped a friend build one to provide power in a large shed/ workshop.

what’s your opinion regarding this,.?

I think its a great idea especially in rural areas where there is wide open space for wind to move.If it was done then the price would get cheaper as more homes were built using this Technology. I do believe in the future and we may as well start now we will be doing some things different were it is feasible to do so and so we should.That way easing the burden of an very aging system and giving benefits of the new technology to the next generation of home owners.Its out there we should be using it.Then we will certainly need people trained to fix whatever breaks as something surely will.A grand idea all around.

1. The power P delivered by a windmill whose blades sweep in a circle of diameter D by a wind of speed v is proportional to the square of the diameter and the cube of the wind speed. This dependence on diameter and wind speed is expected in the case of 100%-efficient energy transfer from the wind to the mill. Show that for 100%-efficient energy transfer the power of the windmill is given by P=(pi/8)*ρ*D^2v^3 .
(Hint: First calculate the kinetic energy of a cylinder of air of density ρ moving with speed v, then determine the rate at which this energy is transferred to the windmill.)

The answer is pretty much embedded in the question and the hint.
KE(cyl) = mv^2/2 = ρ*Vol*v^2/2 = ρ*πD^2/4*L*v^2/2
Power = dKE(cyl)/dt = ρ*dVol/dt*v^2/2 = ρ*πD^2/4*v*v^2/2 = π/8*ρ*D^2*v^3.