Vertical Wind Turbine Design

Robert asks…

I want Complete details for construction of variable pitch vawt ?

Vawt=Vertical Axis Wind Turbine

Windmill Farms answers:

Google search box:
[vertical axis wind turbine ] Resulting Google page:
Click this link:

http://www.google.com/search?hl=en&q=vertical+axis+wind+turbine&rlz=1R2GGLL_en&aq=7&oq=vertical+

Next stop in search:

http://www.ecobusinesslinks.com/vertical_axis_wind_turbines.htm

In first yellow box, third item from left:
How 2 Build Wind Turbine?
Don’t Buy a Wind Turbine Until You See This “Shocking” Review :

http://www.how2buildwindturbines.com/reviews2.php?apid=A1H

Scroll down to: <> and click it.

Http://www.how2buildwindturbines.com/reviews2.php?apid=A1H

I looked over the entire page, wind generators, yes but no details on a VAWT. Interesting,you might get some ideas.

At this site, you can purchase a book they did not give a price:

http://www.homemadeenergy.org/?hop=lutlut

Another search on [vertical axis wind turbines ]

http://search.yahoo.com/search;_ylt=ApZSB9AeOg4APz959In2.g8bFt0A?p=vertical+axis+wind+turbines&fr=ft-shop&ei=UTF-8

It appears that wherever I go, given the search
[vertical axis wind turbines ], only propeller styles come up.

A Wikipedia search, lots of math:
When you arrive at Wikipedia, notice all the colored / highlited / items. There are several on each line that you
can click on. Each will take you to places in the land of OZ.

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

At the bottom of this Wikipedia page.
[Unconventional wind turbines ]

http://en.wikipedia.org/wiki/Unconventional_wind_turbines

Interesting concepts.

I will look some more, and come back with or without results.
In the mean time, enjoy these sites.
When doing searches, try moving your search words around
like [ turbines, vertical axis ] Doing this can bring up other choices.

Did search on Google [ plans for vertical axis wind turbine ]

http://www.google.com/search?hl=en&q=plans+for+vertical+axis+wind+turbine&btnG=Google+Search&rlz=1R2GGLL_en&aq=f&oq=plans+for+

Found plans for one made out of a water bottle:

http://www.re-energy.ca/pdf/wind-turbine.pdf

Ideas at least.

Went here:

http://greenterrafirma.com/vawt-designs.html

Down near page bottom,Link to VAWT blade design.

Http://www.windstuffnow.com/main/lenz2_turbine.htm

I think, this what your are looking for. Good pictures and detailed blade design.

Done now, feel free to email me with any other questions.

Hope this was some help.
Wingman

Ruth asks…

How do you measure wind speed?

how do you measure wind speed mathmatically
(without any devices)

Windmill Farms answers:

The simplest type of anemometer is the cup-anemometer, invented (1846) by Dr.John Thomas Romney. One particular good thing about the cup anemometer is its simplicity. But if you use without electronic data logging equipment it isn’t very good at leaving a record of the actual speed at any particular moment, and so it can leave very brief events unrecorded. Unfortunately, when Dr. Robinson first designed his anemometer, he stated that no matter what the size of the cups or the length of the arms, the cups always moved with one-third of the speed of the wind. This result was apparently confirmed by some early independent experiments, but it is very far from the truth. It was later discovered that the actual relationship between the speed of the wind and that of the cups depends very largely on the dimensions of the cups and arms, and may have almost any value between two and a little over three. This had the result that wind speeds published in many official 19th century publications were often in error by nearly 60%.
Hot-wire anemometers use a very fine wire (on the order of several micrometers) heated up to some temperature above the ambient. Flow past the wire has a cooling effect on the wire. As the electrical resistance of most metals (tungsten is a popular choice for hot-wires) is dependent upon the temperature of the metal, a relationship can be obtained between the resistance of the wire and the flow velocity.

Several ways of implementing this exist, and hotwires can be further classified as CCA (Constant-Current Anemometer), CVA (Constant-Voltage Anemometer) and CTA (Constant-Temperature Anemometer). The voltage output from these anemometers is thus the result of some sort of circuit within the device trying to maintain the specific variable (Current, Voltage or Temperature) constant.

Additionally, PWM (Pulse-Width Modulated) anemometers are also used, wherein the velocity is inferred by the time length of a repeating pulse of current that brings the wire up to a specified resistance and then stops until a threshold “floor” is reached, at which time the pulse is sent again.

Hot-wire anemometers, while extremely delicate, have extremely high frequency-response and fine spatial resolution compared to other measurement methods, and as such are almost universally employed for the detailed study of turbulent flows, or any flow in which rapid velocity fluctuations are of interest.

Laser Doppler anemometers use a laser beam that is split and sent out of the anemometer. The backscatter of the laser beam off of air molecules is directed into a detector where the relative velocity between the laser in the anemomter and the backscattered radiation is compared to determine the volocity of the air molecules

Sonic anemometers use sound waves (ultrasonic) to measure wind speed and direction. They are capable of measuring wind velocity in the X (east-west), Y (north-south), and Z (up-down) directions. The spatial resolution is given by the path length between transducers, which is typically 10 to 20 cm. Sonic anemometers can take measurements with very fine temporal resolution, 20 Hz or better, which make them well suited for turbulence measurements. The lack of moving parts makes them appealing to automated weather stations. Their main disadvantage lie in the distortion of the flow itself by the structure supporting the six transducers. This distortion has to be determined by a comprehensive 3D investigation in a wind tunnel in order to obtain accurate wind measurements. Use of such anemometers is likely to increase in the future, both for meteorological stations and for e.g. For wind turbine control systems.

The other forms of mechanical velocity anemometer may be described as belonging to the windmill type. In the Robinson anemometer the axis of rotation is vertical, but with this subdivision the axis of rotation must be parallel to the direction of the wind and therefore horizontal. Furthermore, since the wind varies in direction and the axis has to follow its changes, a wind vane or some other contrivance to fulfill the same purpose must be employed. An aerovane combines a propeller and a tail on the same axis to obtain accurate and precise wind speed and direction measurements from the same instrument. In cases where the direction of the air motion is always the same, as in the ventilating shafts of mines and buildings for instance, wind vanes, known as air meters are employed, and give most satisfactory results.

William asks…

How can windmills or wind systems be put to use in individual homes to save energy and money?

Windmill Farms answers:

There are several small scale household modals. Most still use conventional horizontal axis turbines however there’s a company in the Netherlands that makes the TURBY a small vertical axis micro turbine that is designed for roof tops. Its very efficient small and light and quiet. Its rated for 2.5kw at 14m/s wind speed. They sell for 12k euros however I saw one demoed a while back and stole the design and built some myself. If your good with tools you can build it for under a grand. I’m in the process of putting 3 on my shop roof with possibly 3 more in the spring.

Carol asks…

how to make an working on windmill?

Windmill Farms answers:

Here is a website to make a homemade vertical Axis wind turbine:

http://greenterrafirma.com/vawt-designs.html

From there there is a link to go here:

http://greenterrafirma.com/diy-vawt.html

This a complete set of plans:

http://www.fastonline.org/CD3WD_40/JF/JF_OTHER/SMALL/Pico%20turbine%20plan10B.pdf

Great links here:

http://www.homemade-wind-generator.com/

A 17 foot Wind Turbine:

http://www.otherpower.com/new17page1.shtml

Homemade Wind Generator for Your Home:

http://www.otherpower.com/new17page1.shtml

Wingman

Maria asks…

What are some advantages and disadvanteges of using a horizontal and a verticle windmill?

Windmill Farms answers:

I guess you’re thinking about the types used for wind power. (I know a little about the other types, but I’d be going on forever if I included them to)

Horizontal (axis) machines need to be turned to face the wind to produce power (wind can sometimes be arranged to turn the vanes, or machine can be turned out of the wind to slow/stop it)

horizontal machines need to either transmit mechanical shaft power to the ground via a large heavy gearbox/shaft, or mount a heavy alternator at/near the vanes’ axis of rotation (This increase the stress on the upright support, and hinders maintenance. You also need something like slip rings to allow the electric power down)

Good to see that others have heard of the vertical windmill (I recon that they’re probably a better starting point for for wind power!)

The simplest vertical wind-turbine are much like those spinning signs you sometimes get near garages(?) on roads. They work in a similar way to a Cup anemometers, and don’t need to be turned to face the wind. ( I’d recon many modern anemometers are probably small sub watt wind-turbines)

There’s little need for complex gearboxes/shafts/slip rings, as the alternator is fixed on/with respect to the ground
Think the main problem is it’s much more difficult to stop them from overspending in high winds. (how fast do the spinning signs go round when it;’s windy). They can be stopped from being powered by the wind, by have a shutter to cut of the wind, but that adds complexity

There’s also the problem of the vertical shaft bending in the winds load (supposed to be less of a problem for a horizontal shaft windmill) Also vertical windmills are problem less efficient. They should however be far cheep to design build, not needing long slender aerodynamically shaped blades. (I wonder if they produce the same kind of noise) I also wonder if they’d be a much problems for birds.

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Is Wind Power Green Essays

Helen asks…

Help me with my environmental science essay please?

Can someone describe one advantage to each of the four alternative energy types. 1. Geothermal energy 2. Solar energy 3. Wind energy 4. Hydroelecric power.
which alternative energy type shows the most promise? Explain your opinion.

Windmill Farms answers:

Solar Energy.. As long as sun exist we can generate the solar energy. Today solar energy is used for many purposes because of its advantages. Human civilizations have attempted to harness the power of the sun’s immense energy for thousands of years. In the modern world there are many technological options that allow us to capture the sun’s energy and convert it into usable electricity in our homes. Solar energy is a renewable energy source meaning that it can be continuously recycled and reused.
Solar Energy Facts

1. Solar energy will save you money. Solar energy harnessed from photovoltaic (PV) solar panels is free. There is an initial cost to purchase and install the solar system, but after that there is no cost to the user.

2. There are government based incentive programs available that will cover up to half the cost of your solar energy system. These incentive programs and tax credits will help lower the costs of your investment and make it a more viable option for you as a consumer.

3. Solar power is a reliable energy option. Solar energy panel systems are made well and provide reliable and continuous power. This is due to the fact that they can store the energy more efficiently and there are backup battery systems.

4. Another one of the solar energy advantages is that it is a renewable energy source. This simply means that it won’t run out. Non-renewable energy sources such as fossil fuels are consumed, converted into energy and then they are gone.

5. Solar power is an environmentally friendly green energy source. This means that it is a clean energy source that does not contaminate the environment.

6. Solar energy is self-reliant and self-running. Once a solar panel system is up and running there is virtually no maintenance required. You simply enjoy the benefits.

Linda asks…

Can you check my Ielts essay please?

One day the world’s oil and gas reserves will run out.
The search for alternative energy sources like wind power, solar power, burning waste and water power are causing as much environmental damage as the oil and nuclear power sources they are intended to replace.
How far do you agree with latter statement?
What opssible benefits do the alternative energy sources bring? OR What damage do they cause?

The main sources of energy like oil and gas are over consumed all over the world leading to the hazard of being exhausted. Using alternative energy such as wind power, solar, burning waste or water power instead seems to be a suitable replacement in recent years.

There is no evidence to say that these natural energy reserves could be a danger to environment as much as the oil and nuclear power soures. The benefits they brought are much huger than their drawback. It could be said that using these alternative powers is economical and clean because the sources are exploited from the nature itself. The mutual quality of these green powers is that they are able to revive and long-lasting.

Nowsaday, several wind power and water power factories are constructed to provide electrcity to towns, cities and countries over the world. Factories ran by these infinite energy occupy less areas than nuclear factories do. Nuclear energy factories are usually located far from the residental areas while the wind and water power ones can be operated in the same terrutory with other buildings. More over, the rate of poisonous dross, fuels and carbon dioxide from running process of these factories is reduced because there are no chemical reaction or substances that involve in. In spite of depending on weather condition, the solar power can also be easily installed to produce a huge source of free electricity.
To conclude, alternative green sources of power gradually replace oil, gas and nuclear energy due to their safety to environment and human being.

Is the content ok?do i make some mistakes in word choice? may i lose points for this disagreement in my essay because i’ve read a band 8 essay in which they think the statement in the assignment is true :-?
WHICH BAND DO I GET FOR THIS ESSAY?

Windmill Farms answers:

Line 6, ‘What possible….
Iine 11, ‘….nuclear power sources…
‘The benefits they brought are much huger than their drawback.’?
Line 16, ‘… Countries all over the world.’ Factories run …less area…nuclear power stations. Nuclear power stations are usually …wind and water power generators…same locality as other buildings.
….these power generators is reduced… Reactions or substances involved.
…human beings.

Hope that helps.

Michael asks…

I need three reasons! Help?

I’m writing a persuasive essay on GREEN ENERGY and i need an argument to argue back against for my rebuttal. thank you

What argument would you have against…
1. Using electric cars and receiving tax write offs
2. using solar laminates and small scale wind turbines to produce a house hold energy
3. using green energy instead of fossil fuels because they will run out and are hard to harvest

Windmill Farms answers:

Argument against electric cars: Some theories suggest that the construction of hybrid cars actually has a higher Co2 footprint than other small compact cars, and in return, doesnt have as good green credentials as they claim. Also, they still need petrol, so why not just use compact cars that are achieving the same if not better CO2 emissions and fuel usage compared to other hybrid cars?
With regards to the tax right off, it may be unfair to slap on a tax right off for electric cars as many of these cars are still expensive, and poorer members of society will not be able to recieve these benefits, as they may have to settle for second hand, more polluting cars, whilst more affluent people, who can afford new cars, will benefit, rather than the poorer. This tax right off will also encourage more car use, whilst public transport usage may decrease due to more road users. This will increase car production, therefor increasing carbon emissions in construction, and people are less likely to car share or use public transport which is probably more efficient, as many people will be using a high capacity vehicle.

Solar laminates and wind turbines: turbines are usually loud and are a hazard to birds. This may cause a detremental effect on the ecosystem, as noise can affect wildlife breeding habits, and obviously, blades cause a hazard to flying birds. Also, these systems are expensive, and may not be feasable to everyone. They can also be considered as “sight pollution” or eyesores, spreading a NIMBY attitude (not in my back yard – a term used to describe attitudes of people who do not like certain projects near them, but may not mind them overall if located elsewhere).

Green energy: So far, fossil fuels are more efficient at producing vast amounts of electricity. Think of how many wind turbines or solar panels or biomass plants etc are needed to produce the same amount of electricity as a coal fired plant, or gas plant etc. Powering the country on green power will either leave a power defecit, as there is not enough renewable enrgy plants to power countries yet, and if you need to build more renewable plants, this has a knock on effect to tax payers, coughing up more money to build new things, and also needs alot of space, and prior planning as to not affect wildlife etc, as already mentioned with the wind turbines.

By the way, these are not my opinions, i have just said them to give you counter arguments. I actually think those schemes are pretty good….
Hope this helps.

Lizzie asks…

My essay is bout environment issues but the title ” Save the World” would be used A lot. Any ideas?

Does any body have any ideas? I would like my title to be more of an attention-getter than a common title.

Windmill Farms answers:

Going Green
Solar Window Heaters
Geothermal Power
Heat Pump
Wind Mills
Recycling
Buying Green, etc

Maria asks…

what is clean energy?

so i have a geography assignment due soon and i need to write an essay on 3 different strategies to tackle climate change, each strategy needs to have 500 or more words. One of the strategies i have chosen is clean energy, i am having lots of trouble getting information about it and finding out what it is.
If you can help me please do, it would me much appreciated.

Thanks :)

Windmill Farms answers:

Energy that produces no pollution or waste, and CO2 counts as pollution, so Solar power, Wind energy, Geothermal, and I believe, hydroelectric.

But unless she specifically states it has to have 0 pollution, you could also use the subject of conservation, limiting our power usage and in doing so lowering pollution, and hybrid vehicles, which encourage green energy, without the issues that come with depending upon electric batteries.

-Increasing Mpg for vehicles lowers pollution.

-Encouraging hybrids lowers pollution.

-”sequestering” coal plants lowers pollution.

-Using Solar/Geothermal/Wind/Hydroelectric power lowers pollution.

-Increasing efficiency with almost anything that uses electricity or fuel lowers pollution, also saves you money.

-A good “transition” fuel source is natural gas, it’s not good for the environment, but it’s far preferable to coal.

-Using more public transports like bus lanes, trains, monorails, ect. And making them more accessible, will lower pollution, due to less vehicles on the road pumping out that CO2.

-Switching all our light sources to LED or florescent, would save us money, electricity, and as a result, could close up to 70-80 coal plants total.

-Nuclear power while not waste free, provides practically no CO2, being a great alternative source of energy to those coal plants.

-A new national power grid, or even regional one, can save lots of electricity in transportation, and make “intermittent” sources of energy safer. (intermittent energy means energy sources that depend on things beyond our control, like solar depending on it not being a cloudy day, and wind depending on well, the wind blowing).

-Lower bumper heights, this will encourage more drivers to seek smaller more energy efficient cars, they can always use adjustable hydraulics for heavier loads.

-Encourage smaller and lighter cars, they save energy.

-Invest into research of new energies to keep making them more efficient.

-Quit using so much water and power to keep fields with green grass, artificial grass is far cheaper, and far better for the overall environment, then pumping millions of gallons of water a year, and it’s still plenty safe.

-Switch to variable speed pumps, it saves massive amounts of electricity.

-Net Zero homes operate without any CO2 at all! They aren’t completely practical yet, but they’re a great idea, and may impress your teacher.

======================================================

-Switch to “green energy” where you can, solar/wind/geothermal/hydroelectric and use a smart grid so they’re safe.

-Use sources like nuclear and natural gas to help with the transition.

-And heighten efficiency and use better sources in the meantime, it’s a great idea to switch to green energy, but it takes time and research, in the meantime we need to stretch what we currently have, and limit the damage to the best of our ability.

There are many more ways, and if you research a few of the ones I mentioned you can get a lot more “beef” or words, out of it.

Feel free to use some of these, or none, it’s a lot to read after all.

Hope this helped, have a good one!

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Uses Of Wind Energy Today

James asks…

wind energy?? help? ?

where can i find the info to answer these questions? :

thoroughly describe all the ways wind energy is used today. who uses it the most (what country or people)?

What percentage of total US. energy comes from this source?

i need the site.

thank youu

<3

Windmill Farms answers:

Http://www1.eere.energy.gov/windandhydro/wind_technologies.html

Lisa asks…

what is wind energy,how is wind energy produced,and where are the best locations for wind farms?

Windmill Farms answers:

Wind Energy-creates electricity,renewable energy source, works whether or not it is sunny

WIND ENERGY- Like old fashioned windmills, today’s wind machines (also called wind turbines) use blades to collect the wind’s kinetic energy. The wind flows over the blades creating lift, like the effect on airplane wings, which causes them to turn. The blades are connected to a drive shaft that turns an electric generator to produce electricity

WIND FARMS- Good sites for wind plants are the tops of smooth, rounded hills, open plains or shorelines, and mountain gaps that produce wind funneling.

Paul asks…

thoughts on solar energy?

doing a research paper so can i have your thoughts

Windmill Farms answers:

Hey Wisconsin, let me see if I can help. If you invest properly in solar power today and take advantage of any grants and tax incentives, even if your electric rates do not go up as they are forecast too, you will get your money back over time, well within the lifetime of the equipment, and sooner if there is a rate increase in the future. There are also enviromental benefits. At one time there was an argument that a solar panel will never produce as much power as was used to manufacture it. First of all, this is not correct. The, “Embodied Energy,” in a solar panel is earned back in 2 – 6 years, depending on the type panel, where the raw materials were shipped from, and how it was installed and used in the end. Most panels are warrantied to last at least 25 years, and most last much longer than that. But the argument is not important anyway. We have been living with electricity for over a century now, so it isn’t going away anytime soon. The question is, “What is the best way to produce it?” If you build a panel, and put it along side a similar sized natural gas fired turbine generator for example, which earns back its embodied energy sooner? The answer is the gas turbine never does, because once you build it, ship it and install it, you now have to feed it natural gas for the rest of its life, so it keeps on digging itself a deeper and deeper embodied energy hole that it can never crawl out of. At least the panel has a chance to get even environmentally. So manufacturing and using solar panels in the end releases less pollution into our environment.

There are also mechanical and political benefits. We all know after the oil embargo of 1973, and the gulf war what it means for our country to rely on foreign oil. Wouldn’t it be nice if we only shipped in 20% of our energy instead of 60% the next time something like that happens? Our home has been powered by the wind and sun for years now, but we still remain connected to the electric grid. Last year alone there were two power failures in our county that lasted about a half day each. In both cases, we were not aware of them because our solar array kept on feeding the house. It’s difficult to put a price tag on something like that. Did you know that there are over 100,000 homes and businesses in the United States alone that use some level of solar power to operate their electrical devices, that’s good news.

Beyond the mechanical, political and environmental benefits however, lies a less obvious benefit, the social benefit. Right now we pump oil out of the ground, and mine for coal. The process of getting those materials to market involves shipping, military escorts and other activities that use up a good portion of that energy as well as putting lives at risk. Jobs in alternative power are higher tech than jobs in coal mining, oil drilling and shipping, and there are more of them. Using more alternative power would require us to put more people to work, and increase our education base because the work involved requires certain skills. I would personally like to take all those people out of the coal mines, send them to school and put them to work building solar panels. Nobody would have to die again in one of those dark holes in the ground trying to find food for our hungry power plants. They could work on a factory floor where they would not be exposed to coal dust, radon and other toxins and dangers. Most of our solar and wind resources are spread pretty evenly over the middle half of our globe, so everyone has access. This puts people in Bogota on a more equal footing with people in Boca Raton by giving them access to electricity, heat and clean water, and the education to use the solar, wind and biomass resources that provide those things. Oil, coal and natural gas is generally piled up in a few places, such as Russia and the Middle East. This gives those countries and the richer governments that rule them more horse power in bargaining for the other resources of our planet. These are the things that wars are made of.

There are other reasons, but I think you get the picture. For us, renewable energy has become something of a hobby It will probably never save us any real money, utility power in most places is really very inexpensive, but it’s a little like growing your own tomatoes. It’s usually cheaper to buy them at the grocery, but lots of people go to the work and expense to maintain a garden instead. We just grow electrons in ours. If you really want to learn more about the subject, there are some great sources to look into, I will list some below. Good luck, and take care, Rudydoo

Robert asks…

Homemade VAWT Wind Turbine?

I am making a VAWT out of scrap for my senior project. I am going to use it to power a well that uses 240 KWH per year and runs at 230 V. It will be about 15ft in the air. My question lies in converting the mechanical energy to power. Should i use a car alternator, a dc generator, or a permanent magnet generator? Also, I am planing on connecting the generator right up to some car batteries and those up to the well; can I do that and if so, how should I wire it and how many 12v car batteries do i need.
Specs: Air scoops will extend out about 5 ft in each direction. Average wind speed is about 7.5 mph.
Also, how should i mount it on a 15ft telephone pole (once i have planted the pole in the ground)

Windmill Farms answers:

Hi Matt, just looking over your numbers here, I have to ask, why are you planning on using a VAWT for this project? Vertical turbines, even the finest engineered ones, are horribly inefficient. They generally run in the 5 to 8 % range for commercially manufactured ones, and much less for home scrap built models. A good quality horizontal turbine is in the 25 to 35 % range. This is the primary reason all the wind farms being built today use this type. The reason for this is that most of the energy developed by the downwind air scoop is used pushing the upwind scoop back into position, so very little is left over to run a well pump, or anything else.

You pump uses 240 KWH per year, or about .65 (650 watt hours) per day. At that rate, assuming you stored your wind turbines power in a battery, it would have to develope at least 40 watts continuously (24/7) to keep up with the demand. Factor in the calm periods and losses with the inverter and battery charging, and you’ll need at least a 100 watt unit to do the job. Looking at the formula for wind power at the American Wind Energy Associations website, and accounting for the low performance of the VAWT, and you end up with scoops the size of a school bus to reach the swept area that is needed to do this. At least with a horizontal unit, you can get by with 1/7th the swept area, but you’ll still need at least 5 square feet of total swept blade area at the correct RPM range to make your needed 100 watts on a breezy day.

What I’m getting at is that I don’t think you’ve taken a good hard look at the numbers here. Even if you could pull off the turbine, you need battery storage, which is strictly DC, and a large inverter, maybe 2400 watts, which is expensive and can’t be built from scrap.

A wind turbine for a senior project is a great idea, but you will have much better luck if you can tone down the load and move it to the DC side of the system. Instead of the well pump, how about LED lighting. You can buy 12 volt strips, or make your own with parts from a supplier like Marlin P Jones to save money. Or use a small inexpensive inverter, like a 400 watt unit from the auto parts store to run Christmas type LED light strings, they only use 2 watts per string. There are lots of possibilities, you just need to add up what you are trying to do a bit more accurately. Using scrap parts to make the VAWT to run the 230 AC pump is like moving 400 tons of gravel with a Ford Pinto. It is possible, but extremely difficult.

We live in a solar and wind powered home right now, our turbine is a commercially available unit from Southwest Windpower, rated at 900 watts, and can barely run our small 1100 square foot home on a real windy night. There are some great sources below where you can learn more about the technology, which is really the point of the senior project, to learn a great deal about something. You still have plenty of time to get into it. If you decide to build a turbine, here is what I would suggest. Look into 24 volt electric scooter motors, they are permanent magent, ball bearing movements and run at lower RPM’s than other units. Car alternators are terribly ineffecient with bushings instead of bearings and pulleys instead of gear cogs. At 24 volts, it would be easy for a 100 watt motor to charge a 12 volt battery bank. Solar panels designed for this operate at 18 volts, and they work fine too. I would use a load controller instead of a charge controller, which will let the wind turbine produce whatever it can, but take any excess and drain it off in a small array of incandescent light bulbs to keep the batteries from over charging. Then use your 12 volt battery power for something small but interesting, like a 12 volt fan, CD player and some LED lights. We run classes in the 5th grade doing this all the time, the kids love it. You can make your own turbine blades from wood, or old box fan blades perhaps. Good luck Matt, learn what you can, and take care, Rudydoo

George asks…

important project for school today….wind power?

ok i need to know why wind power is important to reduce global warming

Windmill Farms answers:

Wind power is important because it is a renewable resource and doesn’t cause any pollution. Wind power creates clean energy that doesn’t harm or take from the earth. Huge windmills are used to capture this energy, the wind turns the mill, and that creates a form of energy that is clean and hurts nothing and no one.
This is important to reduce global warming, because by using wind power instead of oil (one example) there is less pollution harming the ozone layer and therefore, less global warming taking place.

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Wind Energy Advantages And Disadvantages

Nancy asks…

what are the advantages and disadvantages of wind, fossil fuel and oil energy?

I need some advantages and disadvantages for wind, fossil fuel and oil energy.

Windmill Farms answers:

Oil is fossil fuel. Fossil fuel produces energy at a very high rate per investment ($$). And produces energy on demand (which is preferable as energy in grids is produced and consumed simultaneously rather than stored in giant batteries.

Wind is clean, but very expensive to set up, it’s seasonal, and the rate of energy production cannot be controlled.

Carol asks…

What are wind fuel cells?

Is their origin solar/ non-solar?
Advantages/disadvantages
Energy transfers involved (mechanical, chemical, kinetic, nuclear)
How sustainable is it?

Windmill Farms answers:

Wind fuel cells are when the energy from a wind turbine is used to electrolyse water to produce hydrogen and oxygen which are then stored to produce electricity through fuel cells when needed. The advantage is that you only have to increase storage to store more energy so it’s less expensive than batteries. The downside is that you lose energy with the electrolysis, you lose energy in compressing or liquefying the hydrogen and hydrogen has a very low volumetric energy density, a gallon of gasoline has more hydrogen than a gallon of liquid hydrogen. When Sandia Labs researched better ways of producing hydrogen from water, they realized it was just as efficient to produce hydrocarbon fuels from CO2 and H2O. People like hydrogen for the “hydrogen economy” and it’s a favourite of students and teachers but synthetic gasoline and diesel would be as effective and require less changes to our infrastructure.

The energy from the wind is from the uneven heating of the atmosphere so it is a form of indirect solar energy. The energy transfer is mechanical to electric to chemical and then back to electric when needed.

As this is only storage of a renewable energy source, this is sustainable but there are better options.

Robert asks…

What are advantages/ disadvantages of wind energy?

doing a project and i need 3 advantanges and 3 disadvantages of wind energy!

Windmill Farms answers:

Wiind power has a number of advantages and provides an inexpensive, self-reliant method of generating electricity with relatively little maintenance.

However, there are some disadvantages with regard to birds, thunderstorms, and the appearance of turbines. It is not always windy, so a combination of solar and/or hydroelectric with wind power can provide a more consistent supply of renewable energy.

ADVANTAGES

1. The use of wind turbines does not generate pollution or radioactive waste like most other forms of electricity generation do. Their construction and installation has less environmental impact as well.

2. Wind power may be used to provide electricity to individual homes or other facilities on a self-reliant basis, with no need for fuel or other materials to be supplied. If a natural disaster severs power lines, residents with windmills will not lose their supply of electricity.

3. Wind can also generate power for large numbers of people, using larger turbines connected to an electrical grid. This allows individuals to take advantage of some of their benefits without personally owning or maintaining the equipment.

4. Another one of its advantages is that this type of power generation does not consume any non-renewable resources, like coal, natural gas, or oil. Thus, it won’t contribute to their eventual depletion, nor does it promote environmental harm brought about by obtaining these resources.

DISADVANTAGES

1. Some people consider the turbines to have an undesirable appearance, especially when there are very tall units and/or large groups of them. The same could be said for coal or nuclear power plants, but these are concentrated into a smaller number of facilities.

2. Another of the disadvantages is that they can be damaged in thunderstorms, partially because of their tall, thin shape. The website of the National Lightning Safety Institute indicates that most damage to wind turbines is caused by lightening. This is more of a problem in warmer parts of the world, where they are frequent.

3. The blades of wind turbines can hit birds who attempt to fly between them. However, it should be kept in mind that birds are also affected by the disadvantages of other power generation methods, especially pollution.

4. Some turbines produce noise; according to a white paper issued by the University of Massachusetts at Amherst Renewable Energy Research Laboratory, noise varies from one turbine to the next, and is more likely to be problematic when the wind speed is low.

Hope this will give you some ideas in regards to your project. Good luck!

Betty asks…

Why is solar energy a renewable resource and also some advantages and disadvantages of using solar energy?

Please tell me some disadvantages and advantages of using solar energy. I also need to know why it is a renewable resource. Can you also tell me how much of of solar energy is left and how long it will last. Thank you so much. [Tell me some websites to vist about this information]

Windmill Farms answers:

First, its all a guess but the sun will continue to shine for about another 2-4 billion years. So for all practical purposes, its eternal.
Solar energy depends on sunshine, one disadvantage is cloudy, overcast, rainy, snow etc. Days. No sunshine, no real energy. Another difficulty is converting solar energy, solar panels generate direct current (DC) and this has to be converted to AC current to run appliances, etc. In your house. In order to store solar energy, batteries are required, so the DC current from the solar panels can charge the batteries, and then the DC current must be converted to AC.
Solar panels are not cheap but the price is coming down. They also don’t last forever and can be damaged by hail, etc.
The good news is, solar energy is clean, not pollution except for the manufacture of the panels and for the moment, sunshine is still free.

I came accross a new, proven and tested home made wind power system and solar power system which eliminates our electricity bills. It was written by a Renewable energy enthusiasts Michael Harvey the diy called Earth4energy. You can get your copy to save energy and help environment while eliminating your power bills. Get it from here: http://homemadeenergyreviews.blogspot.com/

Ken asks…

What are advantages/ disadvantages of wind energy? (10 points for the best answer:)?

i couldnt find any thing helpful, if you can give me a link that would be great, or just write it out , it would be better, its for this project at least 5 adventages/disadventages, thanks.

Windmill Farms answers:

Noura, 5 advantages and 5 disadvantages of wind energy;

Pros
1. It’s renewable (won’t run out)
2. It’s free
3. Generation produces no pollution
4. Wind generation technolgy is getting cheaper every year.
5. Most states give subsidies making it even cheaper!

Cons
1. No wind = no energy
2. Relatively low output compared to other types of electricity generation.
3. Some people don’t like the visual look of the turbines.
4. Some birds fly into them getting killed.
5. Setting up a wind farm involves a large initial investment.

More detailed description in the link below.

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Renewable Energy

Jenny asks…

Non renewable and renewable energy…?

Why is non renewable bad and why is renewable better?
Please have a big and long answer that makes sense.

Windmill Farms answers:

Renewable energy is a fuel source that naturally recreates itself, or can be artificially recreated as fast as it is used up. Fire wood is an example. Trees grow fast enough that you can cut and burn them for fuel forever, if you don’t need too much heat. If you don’t cut too many, they grow back as fast as you cut them.

Non renewable energy is a fuel that does not recreate itself or cannot be made artificially as fast as it is used up. Coal is an example. Coal does not grow. It is dug out of the ground and when it is all dug up, no more gets made. Eventually, in hundreds of years, all the coal in the world will have been dug up and burned and then there will be none left.

Petroleum (oil) is another non renewable fuel. But there are ways to make artificial fuels similar to oil, such as bio diesel or ethanol that can replace petroleum. But just like with trees for firewood, where you can only grow so many trees a year, they can only make so much ethanol and bio diesel a year, and it isn’t nearly enough. People and companies are working very hard to find ways to make more and make it faster and cheaper, but so far we cannot keep up with how much the world wants to use, and we are still using up the limited world supply of oil in the ground.

Laura asks…

what are renewable energy?

Windmill Farms answers:

Renewable energy is one that can be used again and again without exhausting the resource; wind energy, wave energy, tidal energy, Solar energy, geothermal energy, biomass (if planned), hydroelectric.

You could also include biogas (produced from landfill sites).

This is a good document telling you how much we use renewables…
Http://www.ren21.net/globalstatusreport/download/RE_GSR_2006_Update.pdf

Charles asks…

what is renewable energy?

hi can you please tell me…thankyou

Windmill Farms answers:

Renewable energy is a source of energy that can never be exhausted.

We can obtain renewable energy from the sun (solar energy), from the water (hydropower), from the wind (wind turbines), from hot dry rocks, magma, hot water springs (geothermal) and even from firewood, animal manure, crop residues and waste (Biomass).

Renewable energy sources can be replenished in a short period of time

David asks…

Why should we have renewable energy sources?

I am writing an essay and I need the answer to this question I want to write about it but I want to know the reason why we need renewable energy sources so I can state it in my essay.

Windmill Farms answers:

Renewable energy are the demand of this age. In past, energy were derived from burning of wood and other biomass sources. And then from coal, natural gas and petroleum products. But as these source of energy unlike wood and biomass products require hundreds and thousands of year to produce, they cannot be replenished and their source is getting depleted at faster rate with rise in population. Thus, energy crisis in future can be predicted even when the world is getting more and more energy dependent if we continue to rely only on the these sources of energy.

Another point is, not every country has got crude oil and coal reserves. Their economy is dependent on other countries as their energy cost can be huge which the other country can manipulate, much like middle east controlling oil – supply and prices which went above $140 per barrel (as of now is above $ 40/barrel). This makes a country less dependent on other country for their energy demand if they can use renewable energy available in their country. Energy from biomass is available everywhere, so is the solar energy(less in high latitude), In the region of higher altitude, wind energy can be harnessed, and energy can be harnessed from ocean, river and other water (larger) bodies and from earth (called Geothermal energy).

Another very important advantage is they are clean source of energy. They don’t cause air pollution either while producing energy from them (like energy from coal) or using them (like using gasoline). With the rise of issue of global warming and cutting out green house gas emission, it becomes more and more increasing important to use them instead of more polluting sources of energy.

Daniel asks…

What are RECs,Renewable Energy Certificates?

We produce green energy and we will get RECs for each 1000 kWh of elec. produced. What are RECs and what are they worth in us dollars?

Windmill Farms answers:

Renewable Energy Certificates (RECs), also known as Green tags, Renewable Energy Credits, Renewable Electricity Certificates, or Tradable Renewable Certificates (TRCs), are tradable, non-tangible energy commodities in the United States that represent proof that 1 megawatt-hour (MWh) of electricity was generated from an eligible renewable energy resource (renewable electricity). Solar Renewable Energy Certificates (SRECs) are RECs that are specifically generated by solar energy.

These certificates can be sold and traded or bartered, and the owner of the REC can claim to have purchased renewable energy. According to the U.S. Department of Energy’s Green Power Network, RECs represent the environmental attributes of the power produced from renewable energy projects and are sold separate from commodity electricity.

In states that have a REC program, a green energy provider (such as a wind farm) is credited with one REC for every 1,000 kWh or 1 MWh of electricity it produces (for reference, an average residential customer consumes about 800 kWh in a month). A certifying agency gives each REC a unique identification number to make sure it doesn’t get double-counted. The green energy is then fed into the electrical grid (by mandate), and the accompanying REC can then be sold on the open market.

Rices depend on many factors, such as the vintage year the RECs were generated, location of the facility, whether there is a tight supply/demand situation, whether the REC is used for RPS compliance, even the type of power created. Solar renewable energy certificates or SRECs, for example, tend to be more valuable in the 16 states that have set aside a portion of the RPS specifically for solar energy. This differentiation is intended to promote diversity in the renewable energy mix which in an undifferentiated, competitive REC market, favors the economics and scale achieved by wind farms. Current spot prices for SRECs in most states with solar portfolio standards can be viewed at SRECTrade. For example, prices in July, 2010 ranged from $255/SREC in Delaware to as high as $665/SREC in New Jersey.

For more:
http://en.wikipedia.org/wiki/Renewable_Energy_Certificates

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