Wind Energy Conversion System

Michael asks…

Bergey wind solar hybrid?

There is a Bergey 1.2 kW hybrid system that provides upto 200 Kilowatt-hours per month.

I’m wondering how much this will power? We have a 46″ LCD tv that we will be using 2 to 3 hours a day. A dektop computer that will be used 4 to 5 hours a day. A well pump. A half dozen lights in the evening. Possably a small refridgerator.

Would a system like this be enough?

Windmill Farms answers:

No, not likely.
You will need twice that.

To get a better idea of your monthly power consumption, use a couple of Energy Calculators.
Each is a little different but they should give you something to work with.

Remember the 200 kWh per month is a maximum not a guarantee of production.
There will also be some losses in energy storage for use at night and DC to AC power conversion.
This means to use standard AC powered equipment (fridge, tv, pumps,.computer) there will need to be an inverter with battery (or grid tied) backup.

Laura asks…

how wind turbine convert mechanical energy to electrical energy?

I have a motor @ home that runs all day long, so I wanted to create a system just like a wind turbine that will be somehow connected to this motor and rotated by the same motor, then converting free energy for my house. Get it? Do you guys think it is worth it? And whom should I go to to get this turbine designed the right way? It’s a strong motor, so how much power do you think I can get from this turbine? please help

Windmill Farms answers:

It probably isn’t worth it. But it depends on how much wind you have in your area and how steady it is. If you are asking for a windmill that will run a motor that needs 24 hr/day power, you will need a windmill that is about 400% larger then that motor to save enough power to run thru slow wind times and conversion losses.

Windmills are more worthwhile the bigger they are. The tower costs more than the windmill ,usually, so you better get the biggest windmill possible to utilize that investment. I think it is better to size your windmill for the LOWEST wind speeds in your area and get the biggest rotor possible (20 ft or more). The trade off is the windmill won’ handle wind speeds over 30 mph or so, so you need to swivel the windmill out of the windstream at higher speeds so it isn’t destroyed. But the nice thing is even with low winds like 8 mph or so, you still will get power and it tends to be more likely to get all day.

You have lots of reading and learning a head of you:

Sharon asks…

How is energy from a wind turbine transferred to the national grid ?

Isn’t the current DC ?

Windmill Farms answers:

Answer #3 was sort of right. You are correct, because of the variances in speed, those generators tend to be DC machines. From the wind turbine the “juice” is fed to inverters that can be phase controlled as well. The DC, after conversion to true sine wave AC, and phase locked to the grid system, and it’s voltage adjusted for the feed point where it will be added in, is switched into the grid system at that point. Best use, unless you have millions to invest in wind turbines and the hardware to go with it, is to use the power at your home, yourself.

Donald asks…

Anybody know anything about the US HYDROGEN ENERGY SYSTEM?

ummm starting byyyy what it is and such? ;)
or just give me some links to follow to understand what it is.
oh oh, how’s it different from what we have now?
of course it exists, else I wouldn’t be asking silly.

Windmill Farms answers:

A “hydrogen energy system” as you call it would be a conversion from gasoline and other fossil fuels to hydrogen gas. People tend to dub this the “hydrogen economy” where most of our energy would be derived from cleanly burning hydrogen to produce electricity. It is different from our current state of energy consumption because our vehicles would supposedly be free of harmful emissions.

Below is a link to a Popular Science article. I have yet to see a more concise set of reasons why the hydrogen economy will never pan out. Hydrogen is simply a means of transporting energy much like electricity. One has to find a way to produce hydrogen from other fuels such as oil, coal, natural gas, nuclear, solar, etc.

Another link that I find both informative and entertaining to read is the Tesla Motors website. Tesla motors is one of a few small car companies that are racing to develop an electric vehicle with great range and performance. I believe THIS is the revolution in automobiles that world has been waiting for. Electric power is cheaply available nearly everywhere across the globe. If we could plug our vehicles into the grid, we could easily take advantage of renewable resources such as solar panels or wind generators. Furthermore, electric motors are FAR more efficient than even the most efficient of internal combustion engines.

So, those are my opinions on hydrogen (it won’t be widely accepted, we should go with electricity). Take them for what you will.

William asks…

How much wind power is left over after going thru a wind turbine?

So would 59% of the energy taken from the wind be anoff to turn the wind turbine w/o wind? Be able to turn the rotor at the same speed the wind was when it produced the 59%? or would it take more like 80%
Ok, so lets say the wind coming in is at 100% wind speed to turn the rotor and get the 59% of energy out of the wind. What is the wind speed % that is leaving the other side of the turbine? 41%? or would it be less from friction and other “energy loss”? anyone know what the exact % left should be?

Windmill Farms answers:

Modern large wind turbines are able to extract a maximum of about 30% of the incident wind energy at rated speed.

This information is taken from the Cp (coefficient of performance) tables provided by the wind turbine manufacturers for use in detailed system models of their turbines.

While the theoretical maximum may be much higher, there are many factors taken into account by the wind turbine engineers when choosing how to design a turbine.

For instance, if a turbine is rated for 1 MW of continuous power output at 15 m/s wind, with a 30% wind energy conversion efficiency, it will ‘spill’ extra wind above this level or shutdown altogether. This is simply because operating the equipment (turbine blades, hub, gearbox, generator, electrical interconnection, and the tower) beyond its design limits can shorten its operating life, sometimes catastrophically.

After passing through the turbine swept area, the wind will retain approximately 89% of its original speed. This is calculated by using (1-efficiency)^(1/3).

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