Wind Mill
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More Great Information on Wind Mill:
How to Build Wind Generator - Make a Wind Mill
Wind Energy Changed into Free Solar Electricity. The secrets are produced easy on how to build a homemade wind power turbine generator at home. Having a house wind power generator gives you the ability to create pollution free power. The major benefit may be to lower your utility power bills utilize the wind to power your home. Everyone wish to stop paying for their electricity and have learned to convert wind energy inside usable FREE electricity by building your own homemade wind turbine at home with regard to $130. Renewable energy can be an alternative to using relating to the grid power and comes clear of the sun and wind it manually. This renewable energy may be easily converted into household capacity to run your home appliances with homemade wind generators and solar panels. Design your property to run off the grid with this power generated from sunshine and wind. Can be done the Same. Many homeowners just want to make a difference in their lives and wanted to reduce their electricity costs because power is getting too expensive and any savings would be a great help. Commercial sun power panels or power producing wind turbines are very expensive which only leaves the homeowner with the alternative to build their own. The generator blades are the main part of your turbine and be made two different ways. They can be constructed from either wood or from stainless steel. You'll want your guide to provide the pros and cons of both so you can price the material and buy what fits in your allowance. Easy to read Instructions With Diagrams and Video You want an instruction guide that is readable and isn't filled with a whole lot of jargon and technical info. You need an readable, easy to understand, guide with both video tutorials and detailed diagrams to make your building go better. Local Information Your guide should explain how to locate wind patterns specific for your area. The higher you go with the base and that tower, the stronger the winds are, and the more power you will create. You guide should be useful for finding that information. Over the last few years, interest has really been aroused in developing a wind turbine. People have discovered the reality that it is not a ridiculous concept to produce electricity at home using alternative methods, other than the methods that are now used. With more and more energy being used on a daily basis along with increased power costs, people are being allowed to remain with huge energy bills to cover. An alternative way to stop paying those bills is always to build a wind turbine and make your own personal. There are dozens of off the shelf wind mill generators available to buy yet a top quality one will cost around $3000. Why not build your though instead of purchasing one? This is undoubtedly the easiest method to generate free electricity for the least expense. What you should study from all this is that will wind energy turbines are great for the planet and is a very effective solution. A modern homemade turbine is really efficient, making it a really exciting power source money. Any person who chooses to build a homemade wind turbine will get an endless supply of energy that requires nearly no maintenance whatsoever.
What factors affect the efficiency of a wind mill/wind turbine? What is the physics related to it?
What physics is related to it (secondary school - to early university level physics)? Also, how would a basic wind turbine be constructed and how would you go about testing the factors that affect the efficiency?
Efficiency (the ratio of actual power out to theoretical power out) is not the primary design goal for a windmill or turbine. The real goal is minimizing total cost per unit energy.
Efficiency is a factor, but initial cost, ease of maintenance, suitability to the context, etc. are all more important. (Just as with gasoline and diesel engines).
Thus, it is clear that theoretical efficiency goes up with the number of blades, but going from 1 blade to 2 increases efficiency by only 6%. Going from 2 to 3 blades increases efficiency by 3%.
http://en.wikipedia.org/wiki/Wind_turbine_design#Blade_count
Going from 2 blades to 3 blades might pay, but while 4 blades would be a little bit more efficient, the gain just isn't worth the costs. Similarly, a 3_D helical turbine can be more efficient that a planar turbine, but would be much too hard and expensive to build.
For another example, Darrieus wind turbines are never as efficient as propellor type turbines, but are still considered practical for power generation:
http://en.wikipedia.org/wiki/Darrieus_wind_turbine
For one thing, they never have to rotate to face the wind; and their electronics can all be at ground level for ease of access:
http://en.wikipedia.org/wiki/Vertical-axis_wind_turbine
That's even more true of Savonius turbines:
http://en.wikipedia.org/wiki/Savonius_wind_turbine#Use
A subtle point is determining which "theoretical power" to count. In general, the higher you go the faster the wind and power goes up as the cube of the velocity.
http://en.wikipedia.org/wiki/Betz%27_law
So when you consider a vertical propellor, do you use the wind velocity at the axis? at the top tip? (In theory, you have to do an integral, but that assumes you know the distribution of wind speeds.)
And what do you do about storms? When the winds are too fast, the turbine cuts back on generating power, but what speed is "too much"? Do you design the turbine to handle 90% of the wind or 99% of the wind? You may get twice as much total energy out of the 99% turbine (because the 9% of the time that it is working while the other isn't, the wind is fast and has lots of energy) but the costs are much greater.
(BTW, recent analysis suggests that the best possible planar (simple propellor-type) turbine can only come away with 30% of the energy in the wind that goes through it.)
http://www.math.le.ac.uk/people/ag153/homepage/Gorlov2001.pdf
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