Wind Power Generator

Sharon asks…

Energy conservation as it relates to windmills?

Rows of wind-powered generators are used in various windy locations to generate electric power. Does the power generated affect the speed of the wind? Would locations behind the windmills be windier if the windmills weren’t there? Discuss this in terms of energy conservation.

Windmill Farms answers:

Do you mean energy conservation, or the conservation of energy?

The first wind turbine will extract power from the moving air stream, and since energy is conserved (neither created or destroyed), the downstream air will have less energy. The energy of the moving air mass is proportional to the velocity, therefore velocity (aka air speed) will decrease.

The power available from a horizontal axis mill (they look like airplane propellers) is:

Power in watts = (1/2) x (air density) x (swept area) x (wind velocity) cubed. Sorry, it isn’t easy to type formulas in these boxes.

Air density is 1.23 kg/m3 at sea level
swept are in square meters
wind velocity in meters per second

The theoretical limit to efficiency (called the Betz limit) is 59.26%. Real world generators will extract less energy than this. You could use this for the sake of example, and then work backwards to see how much slower the wind immediately behind the first would be. The energy in front of the mill = the energy extracted by the mill + the energy behind the mill.

Have fun with the math.

Sandy asks…

What can I do with 2kw wind power generator?

How many of these wind power generators to power a house?
Generates 2kw per

Windmill Farms answers:

Typical house has a load demand of at least 12 kW.

So you would need at least 6 wind-powered generators
to meet this average power demand.

George asks…

What are the right batteries for a wind generator and where can i find them?

I am looking into building my own wind generator but i cant find the right batteries. Any help would be useful.

Windmill Farms answers:

I think you are looking for deep cycle batteries, the same kind that are used with solar collectors.

Try some of these sites…

Edit – to answer the question “Why not car batteries?” … The difference between a deep-cycle and car battery is that deep-cycle batteries contain solid lead and withstand “deep-cycling” (losing up to 80% charge) better than automotive batteries, which have a different construction. Car batteries are designed to give you more “starting” power and stay up above 50% charge. Deep-cycling a car battery can result in a quicker breakdown of the core, thus increasing cost in the long-run.

Maria asks…

My portable power generator starts up, but does not maintain a running state?

I fire up my old portable gas powered generator and it starts up, but then within several seconds it will wind down until it turns off. If i hold the start button it stays on. Any help regarding what is wrong, and how to troubleshoot this would be appreciated. Thanks!

Windmill Farms answers:

Dirty carburetor.

Mary asks…

How do you build a nuclear power generator?

Ok I was just wondering…can you build a nuclear power generator like the one that was shown on iCarly (but a legal on, not an illegal one lol), and if so, how would you go about it?

It would be cool to cut down on the electricity bill with one of those things lol.

Windmill Farms answers:

You wouldn’t be allowed to build a nuclear power station at your house.

However, there are plenty of other ways to generate your own energy like micro hydro (water), Wind, solar and burning things. What you chose depends on what resources you have i.e. You’ll need a fast flowing river or some sort of water level height difference (like a dam) for hydro, a forest that you own/ are allowed to cut trees from for burning things.

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