Vertical Wind Turbine Design

Mark asks…

hawt wind turbine energy calculation and blades surface effect?

in wind energy calculation there is no effect of the blades area?only swept area?because calculating one example:
3 blades, 2 meters diameter(each blade 1 meters)calculation is p=0.5xair density(cubic meter/kg) x swept area(square meter) x cube of wind speed(meter/s.assuming 10 m/s.)=1500 watts.this means if a 150 kg weight hang on a mill that has 30 cm diameter ,so per turn it would lift it 1meter.it should turn it 60 rpm/min.this means each blades tip must be pushed with around 20 kg power.which is impossible with 10m/s. wind.can anyone explain this including blade surface area and its effect? thank you.

Windmill Farms answers:

Hey Z, there is an effect for all of this, quite obviously. Take the old mills from the turn of the last century, they had 10 or 15 large, flat, wide metal blades, so almost all the swept area had some blade area exposed. These were actually quite inefficient it turns out, a long, slender blade with a high aspect ratio operating at a higher speed works much better. This is why we have the type turbine blades you see today, usually 2 or 3 long skinny blades and the rest of the area is open.

What is missing from your formula is turbine efficiency. The formula you are working with is used to calculate the amount of power available in a column of moving air. What the turbine is able to extract from this moving column of air is a great deal less than this.

Modern turbines today have efficiencies around 20 to 35 %. So let’s say you do your calculation for swept area, speed and air density and determine that 1500 watts are available. A good quality turbine running near its design rpm will only extract about 450 watts. There is a theoretical limit on turbine efficiency, around 59%, called the Betz limit, named after the French engineer that discovered it. You mentioned a VAWT, or vertical axis wind turbine. These type turbines, previously called, “Darrieus,” Rotors have horrible efficiency ratings, usually around 5 ot 8 %. The reason for this is that most of the energy absorbed by the downwind blade is being used to force the upwind blade back into position for the next cycle, so very little is left to produce energy. They are really neat, look more attractive than horizontal turbines, and might be easier to mount, but you can never get any real power out of one. The turbine we have at our home is about the size of a large ceiling fan, 7 foot or so in diameter, yet on a windy night it can produce over 1000 watts. You’ll never get production like that from a similar sized Darrieus rotor, but if you’re building one as an example, or maybe to run a backyard pond pump, it might be fine, just do the math first.

There is some real technical information at the American Wind Energy Associations website you can look into. Specifically, I would look or articles written by Mick Sagrillo, he is considered today to be the modern day guru on wind turbines. He has one article that explains all the misinformation surrounding Darrieus rotors, or VAWT’s, as well as a better explanation of wind power equations and rotor efficiencies. Take care Z, Rudydoo

Maria asks…

How much percentage does a wind turbine use of the wind?

The Implux uses 87% of the wind, but how much does a normal wind turbine use?

Thanks.

Windmill Farms answers:

Hey Rasmus, Brodes is correct here, Betz Law states that no turbine can extract more than 59% of the energy of a moving column of air and convert it to useable torque. The reason for this is once you exceed this figure, the machine actually starts slowing down the column of air, so less and less horsepower is available. There have been years of study on this, don’t listen to people that make claims otherwise.

The Implux is only an experimental plan. Its designer, Varan Sureshan, has never actually built one, but states his design can easily exceed the Betz Law limit because it is vectoring air basically through a funnel that turns the wind to a vertical direction. He also claims that the large his unit is, the more efficient it will become. Makes you wonder how large it has to be to exceed 100% efficiency.

You have another answer from Kelly here, who has been trumpeting about the Hummer Wind Turbine since joining Y Answers. If you’re really curious, try googling Hummer Wind Turbines, and mostly what you get is links to complaint bureaus, lawsuits and warranty complaints. They do not perform beyond the 80% window they claim to either, in fact, they don’t really work at all.

If you want real info on turbines, skip the online forums like this and go to some real sources, I’ll list some below. We’ve been powering our home for 12 years now with the wind and sun and teaching courses in the local schools on the technology. There aren’t any “breakthrough” technologies in this area, the best built turbines today operate at around 28 – 35 % efficiency. Ours clocks in closer to 25%. On a windy night it actually runs the entire home, just barely. It has a 900 watt peak rating and is about 6 feet in diameter, a bit larger than a ceiling fan. The most efficient turbines in the world actually have one blade, and around counterweight on the opposite end of the shaft, and nobody in the US uses them, there are reasons for that too. Check out the sources below, and take care, Rudydoo

Susan asks…

how air turbine works?

Windmill Farms answers:

Energy is used directly by machinery, such as a pump or grinding stones, the machine is usually called a windmill. If the mechanical energy is then converted to electricity, the machine is called a wind generator, wind turbine, wind power unit (WPU), wind energy converter (WEC), or aerogenerator.

This article discusses electric power generation machinery. The Windmill article discusses machines used for grain-grinding, water pumping, etc. The article on wind power describes turbine placement, economics and public concerns. The wind energy section of that article describes the distribution of wind energy over time, and how that affects wind-turbine design. See environmental concerns with electricity generation for discussion of environmental problems with wind-energy production.
Wind machines were used in Persia as early as 200 B.C.[2] This type of machine was introduced into the Roman Empire by 250 A.D. However, the first practical windmills were built in Sistan, Iran, from the 7th century. These were vertical axle windmills, which had long vertical driveshafts with rectangle shaped blades.[3] Made of six to twelve sails covered in reed matting or cloth material, these windmills were used to grind corn and draw up water, and were used in the gristmilling and sugarcane industries.[4]

Mandy asks…

which turbine is best, vertical or horizontal, i wanna design a model to use in a lab?

i’m working on a wind turbine, and we are coming up with design concepts, ie material to use and stuff like that..

Windmill Farms answers:

What are you attempting to model?
Wind drag on a car, plane, boat?
Horizontal
other wise vertical is better, flowrate is more unified across flow area

Nancy asks…

I NEED RECYCLING INVENTION/CREATION IDEAS!!?

I recently began making recycling inventions or creations. for example, i made a rain barrel with a gutter system. and i made a can crusher with a tube that carries the cans to the garbage can… im looking for more ideas like this….. if anyone can maybe supply me with directions on to make a inexpensive and easy to build wind turbine
THANKS

Windmill Farms answers:

Good for you! I love to do the same.

A vertical axis wind turbine (VAWT) is fairly easy to build, but finding good plans is harder than I thought it would be. This site has a couple of videos about it: http://greenterrafirma.com/vawt-designs.html (scroll down to “55 gal VAWT”). I actually have a book with detailed plans somewhere if you want to email me I’ll see if I can find it and make a PDF copy.

Another cool project is a solar cooker. This site is from Solarcooking.org: http://www.solarcooking.org/plans/ and has a ton of different plans. I’ve built a modified version of the heaven’s flame cooker as a project working with kids. We baked cookies in the park in works very well.

A place that’s fairly local to me is Aprovecho environmental research. On their site you can find plans for rocket stoves (high efficiency wood or coal stoves) including the “Institutional barrel stove” made from two 55 gal barrels. I have the plans for that to and have wanted to built it for years. Maybe you’ve inspired me to finally getting around to it, been meaning to build the wind turbine too…

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Does Wind Power Produce Greenhouse Gases

Ken asks…

In order to make 35 kWh in electricity, how much of each greenhouse gas is emitted?

I found this article: http://www.naturvardsverket.se/Documents/publikationer6400/978-91-620-8537-7.pdf

It is about a facility that changes nitrouse oxide into nitrogen and oxygen. The article says, “The facility requires electricity equivalent to 35 kWh per kilogram of destroyed nitrous oxide.”

So, I was just wondering. In order to make 35 kWh in electricity, how much of each greenhouse gas is emitted?
Thanks!

Windmill Farms answers:

It depends upon what process is used to produce the 35kWh of power.
If the power is produced by a hydraulic system such as a dam then there would be no greenhouse gases produced. The same if it is produced by wind or solar power systems, however if produced by a coal fired power plant or a gas fired turbine generator plant then you would have emissions to deal with.

To generate enough electricity to burn a 100 watt light bulb for a year you would produce 5.1# of nitrous oxides from a coal fired power plant.
REF: (http://science.howstuffworks.com/environmental/energy/question481.htm)

100 Watts x 8760 hr/year = 876,000 Whr = 5.1# nitrous oxides = 2.3 kilos x 35000Whr = 80,500Whr

80,500Whr needed/876,000Whr used = 9.2%

So it would take about 9.2% of the electricity produced to get rid of the nitrous oxides with this process.

John asks…

why do we use greenhouse gases?

Windmill Farms answers:

For the most part we don’t USE them – they are unwanted and unwelcome by-products of processes which we use.

For example, the best-known greenhouse gases are carbon dioxide, CO2 and carbon dioxide, CO. Although CO2 does have some uses (eg. In fire extinguishers and carbonated drinks), the main source of CO2 (and CO) is through burning fossil fuels such as coal and petrol to get energy. We don’t burn fossil fuels in order to obtain CO2 and CO and we have relatively little use for them when we do produce them.

This is why an increasing amount of thought is going into developing energy sources which do not produce CO2 and CO, such as solar power, burning hydrogen, wind power and even nuclear power (despite the other risks involved in nuclear energy).

Other greenhouse gases include such chemicals as the refrigerants used in refrigerators and freezers which are being phased out and replaced by non-greenhouse alternatives.

Carol asks…

Is wind energy helpful?

Do u know if it helps our environment?

Windmill Farms answers:

Clean energy does not produce harmful emissions that contribute to air pollution; therefore, wind energy does not contribute to global warming. Carbon dioxide produced by burning of fossil fuels is a main contributor to greenhouse gases.
Wind energy does not produce air or water pollution, or produce toxic wastes. Another benefit of clean energy is reduced health risks, due to less carbon dioxide released into the air when wind generated power replaces electricity for use in households.
Wind energy is an economical alternative energy source for power generation. Fossil fuels are more costly to produce than wind energy. As a clean renewable energy source, wind energy does not produce harmful greenhouse gases or air pollutants. Wind energy costs are less than conventional energy sources. These are just a few of the benefits of using wind energy.

William asks…

homework help?

Explain how wind turbines might reduce the effects of global warming.

Windmill Farms answers:

Wind turbines do not produce greenhouse gases when generating electricity. If the energy was generated by a coal-fired power plant instead of a wind turbine, then that would add more greenhouse gases to the atmosphere. Also wind turbines remove a tiny bit of heat energy from the wind and use it to generate the electricity (wind being a heat-driven phenomenon) but that tiny bit of cooling is probably not measurable.

Charles asks…

conventional and alternate power?

what effect do conventional methods of producing electricity have on the environment? and what effect do alternate methods of producing electricity have on the environment? plz help!

Windmill Farms answers:

CCOnventional methods like coal burning plants to produce electricity produce extreme quantities of carbon dioxide which is a greenhouse gas which causes global warming. Alternate methods like renewable energy wind power plants produce zero greenhouse gases!

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Uses Of Wind Energy In Daily Life

Linda asks…

Solar Power/Energy?

1. How does it work?
2. what is the cost of this energy source? Daily, yearly? individual? home? state? explain please…
3. will it’s cost be low enough for it to be accessible to everyone?
4. will it cost more or less than the energy we have now?
5. how can this source be provided to others?
6. how would it effect transportation?
7. can it work well with other forms of energy?

I just need these questions to be answered. i know it’s a lot, but i’d really appriciate it if you could help.

Windmill Farms answers:

Something you should think of to start with is what are you going to use it for? If it is backup electric power it is the cheapest thing going. It don’t need to be connected to any power line and what if the power goes down. With a solar backup system you still have power when every one else is dark.

Do you buy a car because of cost? No you buy a car because you think you look cool driving it. Or maybe because it might help you pick up a girl friend or something. But not because it is lower cost then a motorcycle to run. Solar is the same way. You get it for what it is useful for not because it is cheaper.

So comparing solar to a new car.. New cars are kewl to drive and looks kewl in your drive way. Well it is cool to have solar panels on your house. Makes you look like your are richer and smarter then everyone else. So why do people buy cars being they are not cheap to have.

1. Too much info to place in yahoo answers. I have written over 60 pages on it on my web site and only touch the edge of what you are asking.

2. Again this question is too vage and would require hundreds of pages to answer. What state. Do you want to know cost by which town? Grid electric is higher priced then solar in some states.

3. When the fuel prices and taxes are placed on the current fuel yes solar power will low enough for everyone to afford because the other would cost more. And a lot of people don’t care because they rent their home and would not want to buy the panels and haul them around from house to house. It will be the home owner who pays for them.

4. I answered this one above but solar energy will be less then buying other types of fuel because the cost of other fuel will go up. The price of solar will go up but not as fast as the other types.

5. You just go buy it if you want it. It is not something that is being hid from the public. I would be happy to sell you all the solar energy you want. What do you want?

6. Solar is not going to effect transportation much at all. You will run your car from hydrogen.

7. Solar, Wind and Hydro electric power is being used together all the time.

You are asking too much in one question to get good answers. Break it up a lot or just do a search on the internet and read everything you find. There is no 3 easy steps to anything in life and solar is a very very large item. There is more to it then just a light shining on a panel and your running you tv on it. It has limits as well.

You are welcome to check my profile and go to the site listed and read all you want. There are links there to take you to other sites for more information if you need more.

Ken asks…

What type of energy do you use? i need as much answers as possible!! and soon!!?

ok, i got for homework to find out what type of energy people use daily, for example, do you use electric energy? solar energy? bio energy? coal energy? you know, in your house, like do you have an old fashioned stove? an electric stove? do you use candles instead of light bulbs?? what do most of you people use as energy? please!! i need a lot of answers!! what type of energy do you use at home?

Windmill Farms answers:

Solar energy.

When I burn gasoline in a car, it’s made from hydrocarbons produced by ancient life through photosynthesis with the sun.

When I use natural gas to heat the home, or electricity from coal, the energy was also stored by ancient life from the sun.

If the electricity is from hydro, it’s from the evaporation of water by the sun to be precipitated at a higher elevation.

If the electricity is from wind power, it’s from the uneven heating of the atmosphere by the sun.

The only sources of energy that are not from the sun are nuclear, geothermal and tidal (tidal is from the rotation of the Earth and the orbit of the moon and actually slows down the Earth’s rotation and the moon’s orbit slightly).

Mary asks…

which is the meaning of life?

Yes, I meant WHAT, sorry

Windmill Farms answers:

Take your pick. Webster’s 1913 Dictionary says:

Life (l[imac]f), n.; pl. {Lives} (l[imac]vz). [AS.
L[imac]f; akin to D. Lijf body, G. Leib body, MHG. L[imac]p
life, body, OHG. L[imac]b life, Icel. L[imac]f, life, body,
Sw. Lif, Dan. Liv, and E. Live, v. [root]119. See {Live}, and
cf. {Alive}.]

1. The state of being which begins with generation, birth, or germination, and ends with death; also, the time during
which this state continues; that state of an animal or
plant in which all or any of its organs are capable of
performing all or any of their functions; — used of all
animal and vegetable organisms.

2. Of human beings: The union of the soul and body; also, the duration of their union; sometimes, the deathless quality or existence of the soul; as, man is a creature having an immortal life.

She shows a body rather than a life. –Shak.

3. (Philos) The potential principle, or force, by which the
organs of animals and plants are started and continued in
the performance of their several and co["o]perative
functions; the vital force, whether regarded as physical
or spiritual.

4. Figuratively: The potential or animating principle, also,
the period of duration, of anything that is conceived of
as resembling a natural organism in structure or
functions; as, the life of a state, a machine, or a book;
authority is the life of government.

5. A certain way or manner of living with respect to
conditions, circumstances, character, conduct, occupation,
etc.; hence, human affairs; also, lives, considered
collectively, as a distinct class or type; as, low life; a
good or evil life; the life of Indians, or of miners.

That which before us lies in daily life. –Milton.

By experience of life abroad in the world. –Ascham.

Lives of great men all remind us We can make our
lives sublime. –Longfellow.

‘T is from high life high characters are drawn.
–Pope

6. Animation; spirit; vivacity; vigor; energy.

No notion of life and fire in fancy and in words.
–Felton.

That gives thy gestures grace and life.
–Wordsworth.

7. That which imparts or excites spirit or vigor; that upon
which enjoyment or success depends; as, he was the life of
the company, or of the enterprise.

8. The living or actual form, person, thing, or state; as, a
picture or a description from the life.

9. A person; a living being, usually a human being; as, many
lives were sacrificed.

10. The system of animal nature; animals in general, or
considered collectively.

Full nature swarms with life. –Thomson.

11. An essential constituent of life, esp. The blood.

The words that I speak unto you . . . They are
life. –John vi. 63.

The warm life came issuing through the wound.
–Pope

12. A history of the acts and events of a life; a biography;
as, Johnson wrote the life of Milton.

13. Enjoyment in the right use of the powers; especially, a
spiritual existence; happiness in the favor of God;
heavenly felicity.

14. Something dear to one as one’s existence; a darling; –
used as a term of endearment.

Maria asks…

what would be life be like with less friction ?!?

plez plez
a paragraph of information plez
can u give me a paragraph of what it would be lyk one morning 2 wake up and find tht there is less friction ????

tht is the proper question !!!
thanks to all the ppl who answer

Windmill Farms answers:

Friction plays an important role in our daily life. Sometimes it is a nuisance if, for example, you want to pull or push a heavy box across the floor. However, think what will happen if there were no friction. You will not be able to use the pen to write notes. The brakes in your car wouldn’t work, etc.
Friction is an extremely important force to meteorology. Not only does friction decrease the wind speed, it also changes the direction of the wind. Two types of friction occur in the atmosphere. One is molecular friction (friction between individual air molecules (called viscosity)) and friction between two surfaces (i.e. Friction between air and land). Since air molecules are free to move about, friction by viscosity is much less significant than friction between two surfaces.
The frictional force causes the wind to slow down about 20% (i.e. A 20-knot surface wind will be slowed to 16 knots). It is at the earth’s surface where the air interface comes in contact with the land / water interface. The air rubbing against the earth’s surface causes friction. Friction is the force that allows your car to stop when you put on the brakes. If there was no friction, the car would just keep moving forward like it was on pure ice. Since the air is forced to slow down, the wind energy is transformed into heat or mechanical energy (primarily mechanical energy in meteorology). An example of friction creating heat energy is rubbing your hands together quickly. You will feel your hands begin to warm up as you quickly rub your hands together back and forth. An example of friction creating mechanical energy is the wind blowing down a billboard sign. When friction forces the wind to slow down, the energy used to slow down the wind is transformed into mechanical energy which (blows tree limbs around, creates ocean waves, blows leaves about, supplies a pressure on objects at the earth’s surface).

Donald asks…

Why do I have basically no energy?

Ok, so i am always sleepy… I am homeschooled, so I sleep around 10 hours.

When I exersize, (sorry for bad spelling, folks) I just become MORE tired
I have not been sick… and I am having enough of my vitamins. So, why? ^^;;
Well, i eat organic foods

Windmill Farms answers:

A deficiency in vitamin B12 will produce symptoms such as fatigue an exhaustion, headaches and migraines, numbness and tingling and prickling sensations in the outer extremities, dizzy spells, fainting and loss of balance, heart palpitations and chest pains,excessive sweating, excessive urination and dry mouth, nausea and vomiting, depression, insomnia and constipation, irritability and moodiness and an inability to think clearly ….Quite scary actually if you don’t realise the vitamin factor.

Vitamin B12 is essential for the effective assimilation of iron, therefore, if you are deficient in B12 you will never assimilate your iron effectively and will be displaying symptoms of iron deficiency anaemia ie ~ dizzy spells, loss of balance, fatigue and exhaustion and fainting.

Eat more foods rich in vitamin B12 ie: organ meats such as lambs fry and kidneys, skimmed milks and cheeses, fish and eggs.

Eat more foods rich in iron ie ~ red meat, clams, dried peaches, farina, egg yolks, oysters, nuts, beans, asparagus, blackstrap molasses is a rich source of iron and oatmeal.

Iron assimilates more effectively when consumed with foods rich in vitamin C ie; citrus fruits such as lemons, limes and oranges, tomatoes and potatoes, leafy green vegies and red and green peppers.

If you are lactose intolerant or vegetarian then it is really important that you supplement your diet with a multi B complex tablet on a daily basis and focus on meat free iron rich sources as i’ve mentioned above.

Things that could be robbing you of your precious B complex of vitamins are :- eating too much protein, alcohol, eating too much tinned food, antiobiotics, antidepressants, penicillin, prednisone and aspirin and otc cold and flu medicines, the oral contraceptive and eoestrogen supplementation.

Also, try to cut back on drinks such as caffeine, tea, sodas and soft drinks as they are all B complex thieves…….. As well as being great at dehydrating you.

Take a multi B complex tablet including all the B’s ie: B1, B2 B3, B5, B6 and B12 as they work best synergistically (together).

The B complex of vitamins is essential for healthy neural, digestive and immune system functioning.

The B complex of vitamins is a water soluble complex and as such our bodies can neither store or produce them. Therefore we need to ingest them on a daily basis or suffer the consequences as you unfortunately are

When you take your daily B complex supplement ensure that you take it with some type of calcium rich food ie: low fat cheese or milk or a calcium supplement as B12 needs calcium to be properly assimilated by the body……….. Ensure you also get enough sunshine (vitamin D) or eat cold water fishes such as tuna, salmon, sardines and whiting as calcium needs enough vitamin D to be effectively absorbed!! These cold water fishes are also a rich source of magnesium (known as the antistress mineral) which is probably another thing you need to focus on as well ~ your stress levels. Quite a handfull of information here …….. Sorry it’s a bit long winded but you need to know all this.

When our bodies are placed under added stress such as sickness, relationship dramas, new job, school studies or just daily life really, the B complex of vitamins are usually the first group to get used up and we therefore need to adjust our intake accordingly.

When you are getting any stress related symptoms or any of the above mentioned symptoms simply take another B tablet. As they are water soluble our bodies will simply excrete any excess in our urine.

Oh, a good way to check if you are anaemic is to pull the bottom lid of your eyelids down and take a look at the skin inside ~ if it is pink or reddish looking that indicates healthy iron levels ~ if it is pasty and white then you are anaemic?

Drink loads of fresh filtered water too as the happiest and healthiest body will always be the most hydrated one.

I sincerely wish you the best of health & vitality buddy?

CHEERS
?

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Wind Energy

Laura asks…

What is the future of Wind energy farms in India?

As in can u tell me the names of all new plans of India regarding wind energy.

Windmill Farms answers:

Wind energy has a tremendous future in India.

The cost factor is a big item in favor of wind energy. The cost of wind energy is very competitive with the cost of electricity genarated with fossil fuels.

Also, India can manufacture its own wind turbines, it does not need to import them. That helps the economy because it is better for the balance of payments.

Also there is a shortage of manufacturing capacity for wind turbines right now. India could manufacture wind turbines for export. This would further boost the economy by bringing in hard currency.

India has excellent wind resources. The majority of electricity could be produced by wind power.

The excess electricity could be used to power electric cars. This is important because priceless treasures such as the Taj Mahal are being damaged by exhaust from fossil fueled carrs and buses and motor scooters.

India could mandate that only electric vehicles will be allowed within 50 or 100 miles of treasures like the Taj Mahal so the are not further damaged by pollution from fossil fueled vehicles.

Ruth asks…

facts about wind energy (10 points.)?

at least 5 will be great, i couldnt find any useful facts.

Windmill Farms answers:

Wind energy facts:
Wind energy is a renewable energy source.
Wind energy is a pollution-free energy source.
Wind energy is mostly used to generate electricity.
Wind energy is mostly used renewable energy source.
Wind energy unlike some thought very economically competitive.
Wind energy is one of the lowest-priced renewable energy sources.
Wind energy is the fastest growing segment of all renewable energy sources.
Wind energy is very exploited in Germany where Germany leads the way with 8750 MW of electrical energy produced from wind energy.
Wind energy basically transformed form of the Sun’s energy.
Wind energy has no fuel expenditures.
Wind energy can relieve fossil fuels shortage.
Wind energy can be very soon the cheapest way to produce energy on the large scale, of course in areas with suitable climate conditions.
Wind energy will surely be important energy source in years to come.
Wind energy could really increase energy diversity and improve the security of energy supply.
Wind energy should be considered as the long-term energy source.
Wind energy good sides are: high working reliability, no fuel costs and no pollution.
Wind energy bad sides are: changeability of wind speed and high construction costs.
Wind energy theory was discovered in 1919 by German physicist Albert Betz and published in his book Wind-Energie.
Wind energy can provide us with cleaner air and much healthier environment.

William asks…

what is wind energy? any info on this?

i need to know a lot about wind energy
what it is:
how it works:
how we use it:
pros/cons of it:

Windmill Farms answers:

Wind energy isn’t really energy from the wind, but its using the wind to generate power using wind turbines and such.
We use it by harnessing the energy and well… Using it. We can use it to power our houses, etc.
One turbine alone can’t produce much energy, but if you have FARMS of them, then it’s not too bad.
Pros and cons?
Its overall a good thing, but some people don’t like them because their upfront cost is expensive. I’ve even read that some people think they cause noise pollution, and that they kill avians.

Robert asks…

How does Wind energy work?EASY 10 POINTS?

Can you Explain to me how Wind energy work?

Windmill Farms answers:

Wind energy has been used for 100′s of years — see the Dutch Windmills.

Basically, it’s easy, hook up a large “Propeller” to a shaft. The Wind spins the Propeller which turns the shaft.

Now the Shaft can be used to convert to energy/rotation into anything… As in the past, a cog that turned another shaft to a grinding wheel to mill wheat or corn or any grain.

But, let’s tak that Shaft and have it connect to a motor — more on this below. The Motor turns, and thus generates an electrical current, which can then be used for Power.

Motor: Most people think a Motor is what makes their car move. Wrong, that is an Engine, which requires a fuel source. A Motor is Electrical. Yes, and Engine can power a Motor for Electricity, as it does in your car — more on the below — but a Motor can also produce Electricity when “Reversed”. So the wind blow, the prop spins the shaft, the motor runs in reverse, and produce Electricity.

Engine to Motor: When you run the Engine, fueled by gasoline, a belt turn the Alternator. This is actually a Motor, that does multiple things, it re-charges your battery, gives you the electricity for gauges, and powers your lights, radio, CD player, etc.

A Motor does not require a fuel source such as Gas. It can be Hand-Cranked to re-charge or power electronics. I can run in both directions, giving output power things, or intake electricity to re-charge things

So, the Wind Energy, a Windmill, uses Wind to turn the blades to spin the shaft to “reverse” the motor (always reverse for such an application), to generate electricity.

You can do this at home. Buy a small motor, hook up a battery and watch it run. Then remove the battery, place the wire to a small light but, and spin the shaft of the motor the other way, and watch the light start to glow.

See? You Well, Given enough Wind and a big enough Motor.

M

Sandra asks…

wind turbines energy source?

How does it work? What devices are used? What are the main energy transformations and transfers that take place? Why is it classed as renewable?
Is this energy source used in australia, and if so, to what extent? Is this energy resource used across the world, if so, to what extent? Which countries are the main ones using it? Is there a reason why some countries are using it and others are not?
What are the main advantages of using this energy resource? Will increased use of this resource help reduce global warming? What health and safety concerns are associated with this energy? What enviomental concerns are associated with this energy resource?
Are wind turbines likely to be a useful and widely used energy source in Australia and across the world in the future? Why?
I’m really curious haha :)

Windmill Farms answers:

Wind power is the conversion of wind energy into a useful form of energy, such as using: wind turbines to make electricity, windmills for mechanical power, windpumps for water pumping or drainage, or sails to propel ships.

A large wind farm may consist of several hundred individual wind turbines which are connected to the electric power transmission network. Offshore wind farms can harness more frequent and powerful winds than are available to land-based installations and have less visual impact on the landscape but construction costs are considerably higher. Small onshore wind facilities are used to provide electricity to isolated locations and utility companies increasingly buy back surplus electricity produced by small domestic wind turbines.[1]

Wind power, as an alternative to fossil fuels, is plentiful, renewable, widely distributed, clean, produces no greenhouse gas emissions during operation and uses little land.[2] Any effects on the environment are generally less problematic than those from other power sources. As of 2011, 83 countries around the world are using wind power on a commercial basis.[3] As of 2010 wind energy production was over 2.5% of worldwide power, growing at more than 25% per annum. The monetary cost per unit of energy produced is similar to the cost for new coal and natural gas installations.[4] Although wind power is a popular form of energy generation, the construction of wind farms is not universally welcomed due to aesthetics.

Although very consistent from year to year, wind power has significant variation over shorter timescales. The intermittency of wind seldom creates problems when used to supply up to 20% of total electricity demand, but as the proportion increases, a need to upgrade the grid, and a lowered ability to supplant conventional production can occur. Power management techniques such as having excess capacity storage, dispatchable backing supplies (usually natural gas), storage such as pumped-storage hydroelectricity, exporting and importing power to neighboring areas or reducing demand when wind production is low, can greatly mitigate these problems.

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Renewable Energy Sources List

Sharon asks…

list of renewable and non renewable energy sources in Austrialia?

Windmill Farms answers:

Pretty much the full list of energy sources are exploited in Australia, except for nuclear power. The energy source for nuclear power, uranium, IS to be found in Australia, so it depends exactly what you are looking for as to whether or not it should be included.

Non-renewable:
Gas
Coal
Oil

Renewable:
Hydro
Biofuels
Wind
Solar
Tidal

Thomas asks…

List three renewable and three nonrenewable energy sources on Cambodia. For each source of energy list four?

advantages and four disadvantages of each.

Windmill Farms answers:

Solar is renewable: expensive equipment
dams and hydro: renewable: expensive start-up; forest destruction
trees are renewable: very slowly; environment destruction.
Tide: renewable: expensive: coastal destruction.

Non-renewable: coal, oil, natural gas, nuclear: all efficient but very destructive of environment and nuclear procuces long-term radioactive waste.

You should really be doing this research in more depth for yourself.

Laura asks…

Name 4 sources of renawable energy ?

Windmill Farms answers:

Renewable energy is that source of energy that does not diminish and gets their replenishment of energies from other natural sources
The various types from where energy can be drawn are; Here are some of the major sources listed below

Solar Thermal Energy
Wind Power
Photovoltaic’s
Wave Power
Hydropower
Biomass
Geothermal Energy
Biogas
Biofuel Technologies
Heat Pumps
Waste Incineration

You can read more from the website below and I belive it will of great help to you

Ruth asks…

Is there any raw data that shows clean energy source % vs?

unclean energy source %? If so, please cite!

thanks!

Windmill Farms answers:

Energy from renewable sources by country.

Http://en.wikipedia.org/wiki/List_of_countries_by_electricity_production_from_renewable_sources

Total energy production by country.
Http://en.wikipedia.org/wiki/Energy_production_by_country

Paul asks…

Which renewable energy source hold the most potential?

I was wondering what the best renewable source was a for our future and wanted some opinions
Please discuss why your answer holds the most potential for our future
Also give for and against reasons:)
Thanks a lot!

Windmill Farms answers:

Wow, this is a great question. There are many renewable energy sources that hold a lot of potential. I’ll list them:
- Wind: This holds massive potential, and we’ve begun to see this already. In fact, if only three of the fifty United States implemented full, large-scale wind power plants, enough energy would be produced to power the entire country. Wind power is also profitable – a good investment, if you have land or know anyone who does.
- Tidal: This is another huge one. For example, the waters around the United Kingdom could be utilized to provide electrical power for the entire nation. There’s a lot more ocean on the planet than land, so the potential for this one is obvious.
- Hydroelectric: This involves damming rivers, and has already been used with great success (see the Hoover Dam in the US and the Three Gorges Dam in China). If more large rivers can be utilized in this way, the electric potential is great.
- Geothermal: This is possibly the biggest, and few people even know it exists. Geysers and other openings in the earth can be tapped into to provide massive amounts of energy. The earth produces this natural energy to provide power to the entire world several times over, and yet this resource remains largely untapped. There are a few successful plants in the 48 lower states and Alaska, but I have a feeling we’ll be seeing more in the future.
- Solar: Many people will say this is the energy source with the most potential. It’s already begun to catch on in big ways, and still holds huge possibilities. Imagine if every building in a large city had solar panels – the potential is obvious.

Alternative energy is a great topic of discussion. Keep bringing it up, and educate yourself further. Remember also that all of these sources could turn a profit – they aren’t only environmentally friendly but economically friendly as well. And ask yourself this: With all this potential, why are we still burning fossil fuels?

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Wind Power For Homes

Donna asks…

How do places with wind and solar energy sustain their power?

Some places rely on solar and wind energy right? To power their homes and such. How do they use energy in the night or when there is no wind? Do they have something that stores the energy like a big battery or something?

I have to “make” a green city and it will use renewable energy source including solar and wind energy. How would I make the wind and solar energy sustainable and not have shortages of power?

Windmill Farms answers:

Small places, like a remote house or an island, might have batteries. A large place, like a city, would be connected to a “Grid”, or electrical energy transmission system. If the wind stopped blowing, deep in the night, they would pull energy off the grid, from a nuclear plant, or coal-burning generation station, or hydroelectric project many miles away. A town on an island might have a large diesel generator.

John asks…

What are some unique environmentally friendly features I could add to a new home?

I am designing an environmentally friendly home. I already have a lot of basic ideas (solar power, daylight harvesting, wind power, water saving fixtures, bamboo floors, soybean insulation, etc). What are some less well known features I could incorporate that would make this house better?

Windmill Farms answers:

Steel roof………under rated totally. About twice the initial cost but you wont be changing shingles , and going to the landfill with them. Plus if the event that the metal has to ever be changed…….recyclable. Also consider harvesting your excess rain water with a underground tank. Use it to water your lawn, plantings for close to nothing. Windows, you can purchase your windows with a low e coating, or you can use the 3-M version and apply it like you would tint film.Keeps radiant heat from penetrating the home. I have used Pex piping, although a plastic product it minimizes repairs in future years plus is quickly repaired. Tankless hot water heaters, you wont be paying for it to heat your water all day long just for your 5 min shower.

Also, when you use your soybean spray foam, consider spraying under the home if its a crawl space construction. Keeps your floor from radiating the cold in the winter time. I like the total envelope method used where the entire house is sprayed, roofline and all. Keeps your attic about the same temp as the house. Which there for, if you store things in, wont be effect by the heat. I personally like using the 2lb spray foam, for it will not allow water to penetrate.

David asks…

If Southern California had windmills during the recent winds there how much electric power do you think would?

have been saved? Enough to power their homes and move out the polluted air now? Your thoughts and comments requested. Should that area invest in wind power?
great, then they should have no problem in clearing out the air pollution and getting electricity to that area again. And, in time with that electricity they could solve the water pollution as well.

Windmill Farms answers:

I used to live in that area. There ARE windmills just North West of the deserts. Somewhere between Barstow and Bakersfield. They are always turning. However, the area I think you are referring to, where “The Santa Ana’s” are whipping up the flames, don’t get a steady supply, BUT, as you pointed out, when they DO get wind, it is an amazing amount. I too think that it would be “eventually” profitable to run windmills all over that area. But, it would bring down the value of the homes, so they will never even consider it. Too many rich white folk with connections.

Nancy asks…

Equipping Home with Wind Generated Power How to Begin?

I am considering equipping a home in West Texas (11 acres of land, plenty of room) with wind powered generators in order to provide electricity to the property. Where does one begin? Can windmills generate enough power to run the home, how is the A/C tied into the home and the feed fro the power company? Any thoughts? Thanks.

Windmill Farms answers:

Check out awea’s website http://www.awea.org/faq/rsdntqa.html.

This shoudl start you in the right place. I know the initial investment for a 10 kw turbine is around $15,000. When you generate more power than you need, the electric company will use it and pay you for it (not nearly as much, though, as you would pay for their electricity). Plan on purchasing batteries to store excess energy as well for times when it’s less windy or plan on still having an electric bill to some extent.

Oftentimes, people employ wind AND solar power systems to back each other up. Usually at least one is going to be generating electricity.

Joseph asks…

When did wind turbines start being used?

Just curious, working on a research paper about wind power and how recently it has become a known valuable resource for green energy.

Windmill Farms answers:

Wind Power is a very good Alternative Energy Source but it does have somewhat limited applications. Mechanical windmills have been around since the late 1800s.

Since the 1860s there have been over 8 million Wind Turbines setup in the US alone. Many of these throughout the mid west where farm families used small Windmills to power their homes. Many of these in the 1920s and 1930s. The AWEA defines Small Wind as any turbines producing 100 kilowatts or less. An average home uses between 800-2,000 kilowatt hours (KWH) of electricity per month. Compared to Solar when you get up to 4-10 KW of wind generation the cost per kWh installed becomes more attractive.

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