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Wind Power
Wind power is derived from the conversion of wind energy to become a useful form of energy to propel ships, make electricity or pump water. Wind is a renewable source of energy that is widely available and produces no harmful emission during operation.
2,489 Questions
How many acres are needed for a wind turbine?
Wind turbines use one or two acres each, with plenty of room between them to avoid air turbulence that can impede airflow.
Why is wind energy controversial?
Wind energy can harm migrating birds.
They are also considered an 'eye sore' on the landscape.
When you consider how much energy went into the manufacture of the turbines, against how much energy they produce, it appears they have a larger 'carbon footprint' than is first thought.
Why Cooling System in Wind Turbine?
Today's power generation, conversion, and distribution require effective cooling. As heat loads continue to increase, manufacturers of wind turbines are turning to liquid cooling to remove high watt density heat loads. Cold plates, heat exchangers, and ambient cooling systems are a few of the cooling technologies used for liquid cooling in power applications.
Power generation requires cooling techniques due to the vast amount of heat that is emitted in the production and transmission of power. The energy transformers used in the wind turbines depend on climatic conditions which affect the performance of the transformers.
wind current!
What is the use of a turbine in refrigeration?
It is used as a compressor. It has the same advantages over a piston compressor as a gas turbine engine has over a piston engine. i.e. no valves, much lower part count and much greater efficiency.
How much would it cost on average to build a wind power plant?
This is not really possible to estimate as unlike coal, hydroelectric, and nuclear power plants which are single large facilities, wind and solar power facilities are incremental distributed facilities involving many separate small units distributed over a large area that can be built slowly over many years and brought on line individually producing usable power as soon as each such tiny unit is finished.
What landforms produce winds in Switzerland?
The mountains and valleys in Switzerland produce wind patterns. These patterns can vary drastically within a few miles because of the mountains because of their heights. It is basically the same with any high mountains anywhere, except Switzerland is enclosed.
How are engineers using wind turbines in the modern world Some fud be a hero and tell is?
The main use for a wind turbine is to drive a geared alternator mounted at the hub of the rotor. The blades rotate at some speed around 29 rpm, and that is stepped up in a gearbox to drive the generator at a more normal speed for an electric generator. The output power is fed to the local distribution grid, at 33 kV for the smaller wind farms or 132 V for the larger ones.
What effect does generating more hydroelectricity have on the use of wind turbines and wave power?
If more hydroelectricity is generated as an energy source, wind turbines and wave power will be used less. If these sources are used less, this could cause job loses and other detrimental effects.
Describe how a simple generator produces electric energy?
A copper wire coil is rotated at speed in a magnetic field, to cause electrons to move. This is the electric current. The stronger the magnets and/or thicker the copper coil, the more current is produced
Because work is being done by a rotating motor. The stalled motor still wants to work, but cannot. The incoming energy is turned to heat.
In-depth Answer:
As a motor slow down under a load its current draw increases. At stall (locked, jammed, etc) the current is maximum for the motor. At this point the motor ceases to be a motor and can be thought of as a resistor in the circuit. As the current flows through the windings they heat up and eventually the insulation fails. This, in turn, causes shorting/arcing between the coils.
Under normal operation the current is low enough not to cause this effect.
Most electric motors have a fan cooling system built into their housings to prevent overheat while running. Also, thermal cut offs are sometimes placed in the coils. These cut power if the temperature exceeds a certain limit.
Is air saturated or unsaturated at sea level?
There is not enough information to determine this. Just being at sea level does not cause the air to have a specific saturation (humidity).
How much oil does a wind turbine consume?
approximately 500 gallons each that must be regularly changed.
A modern day term is "Motor homes"
Answer urban term for a large multi passenger van or wagon, usually from the '50s. also used today for wind powered, 3 wheeled racing/recreational vessels used on dry lakes and open areas.
Where did Charles F. Brush create the first turbine?
In Cleveland, Ohio. check out this site http://www.windpower.org/en/pictures/brush.htm.
Are wind farms worth building?
This remains a very heated debate among promoters of green technologies.
Advantages:
1. Provides energy which is renewable.
2. Producing electricity doesn't let out carbon emissions (unlike coal) or waste (unlike nuclear power plants)
3. Remote areas can use it for electricity, as before they had no access to power plants.
Disadvantages:
1. It relies on strong winds. This means at times it could produce no electricity, and it can only built in some areas, not everywhere.
2. A wind turbine can only supply energy for around 475 households, not enough to power a city
3. They produce a lot of noise, adding to noise pollution in normally soundless areas.
Edit:
They take up hundreds of square miles of land that could otherwise be used fro things like growing food and developing communities. And though it may be hard to tell from pictures, windmills are simply HUGE, making them extremely expensive to manufacture and especially transport.
However, as stated above, once all the windmills are set up, the farm becomes and invaluable source of zero-emission, completely clean energy. Also, the land the farm is built on may not be farm-able or fir for development, meaning that land is being put to its best use, not wasted.
Some say the benefits far outweigh the difficulties, and others claim the opposite, but all things have pros and cons, and wind farms are no exception. I'm sorry I can't give you a direct answer, but then again, no one can! I hope i was able to help you!
Second Edit:
(This question should probably be closed and a discussion made for it.)
Response to Edit number 1. ^
For the "windmills are simply HUGE" part of your argument, there are variants in the size of windmills, since farms usually only use a few small ones as they are only providing electricity for themselves. BUT, if the electricity from wind farms is being used for cities or big towns, then yes, the wind farms can be "HUGE".
How does wind energy not use fossil fuels?
Wind is a natural phenomenon caused by large volumes of air moving as they are heated and cooled by the sun. It doesn't require any fuel to be burnt at all, as all energy comes form the sun.
Actually wind ends up consuming a great deal of fossil fuel. The volume is ignored though to make wind seem green. Wind is a variable source of energy and our demand requires a constant source. As a result fossil fuel plants run behind wind systems and supply power during weaker wind moments. Only the wind power is considered and the idling plant is ignored in terms of CO2 output. This makes wind a very dirt power source. They typically produce about 5 to 8% of what is claimed they produce. A wind system that is claimed can power "up to 100 homes" typically can do less then 10.
How does a level wind mechanism work on an industrial winch?
how does A levels help you in the future? how does A levels help you in the future?
How do you build a model windmill for a garden?
To be able to build a wind turbine generator (or windmill generator as its sometimes referred) you will need to obtain a good guide.
The guide should include, but not limited to-
- Step by step video instructions
- Plans explained in simple to follow English
- Diagrams with captions
- Information on components
- Details of considerations before beginning and calculations used to determine size and suitability etc
- Links to government and other governing bodies regarding grants/subsidies/tax relief
- Contact information should you need any further assistance
All this and much more can be found at the following page
http://www.squidoo.com/DIY-WINDMILL-ELECTRICITY-HOW-TO-MAKE-A-WINDMILL-GENERATOR
Thousands of people have used this guide and are now generating their own DIY windmill electricity, saving them $100's on their energy bills.
P.S. For a limited time there is also a bonus guide on DIY solar panels.
2 guides in 1 -
DIY WINDMILL ELECTRICITY, HOW TO BUILD A WINDMILL GENERATOR
DIY SOLAR PANELS, HOW TO BUILD A SOLAR PANEL
What is the cost to convert a home to solar power?
The initial cost of solar power varies widely. It depends on how much electricity you use, how much Sun your home gets, and rebates in your area. Generally a typical home solar power system is about $30,000 after state and federal incentives. The system will pay for itself in about 10 years and last for 25-30 years. A solar power system connects to the electric meter so a homeowner uses electricity the same as they always have.
Answer
Solar energy can be perceived as an expensive option. However with advancing technologies and demand, prices are lowering rapidly and the long term savings are not to be ignored. Many local governments are also offering incentives for those who choose to go solar. This can alter the estimated cost and is a huge advantage.
The overall cost will vary depending on the size of your home, how much electricity you wish to use, the solar system you select and the amount of sunshine you receive.
For the average family, a solar power system will cost in the range of $12,000 to $26,000 before discounts. For more Information, see related links.
Answer from a customer:
I installed a system that is a wind / solar panel combination. The cost of this self installed system was about $24,000 after the rebates from the Government. I also installed high efficiency lights and any savings devices I could. I live in Wisconsin, so we see a tad less light then some areas, but then we do not have the heat issues that absolutely kill solar output performance. The system delivers enough power to light two 100 watt bulbs and a television for about three hours a day. Payback on the system is about 90 years unless I have any further problems. Two thunderstorms have taken $5K in inverters out so far in the first three years of operation. Getting on to my roof to shovel the panels is not worth the $0.23 a day in power I receive. I would never waste this money for such a poor operating system again. Solar never pays for itself.
Answer:
The cost of solar various depending on your need, for residential you can be spending as little as $30 a month or as much as a thousand+ a month. This is a vary big gap, being as such you can pay after rebates and federal tax as little as 5 grand for a system or as much as 300 grand depending on the size of the system to your needs. The big issue here is the payback, the average system pay back is about 7~ years, with a + or - or 3 depending on your local electric companies pay structure. Along with this solar panes are generally warrantied up to 25 years, but you can expect to see production from these panels 40+ years down the road. Average panel degrading at about .25% - .5% of a year. Inverters will need to be replaced about once every 15 years. As an example of a price if you're paying around $200 in southern California a month for electricity, you're looking at a system to offset to pay around 35 to 40 grand.
Why short pitch winding is used?
In AC electrical machines, to produce a rotating magnetic field, distributed winding is used at stator pheripheri. These windings are of two types, single-layer and double-layer. In a double-layer diamond winding, the slot is divided into an upper and a lower part, and there is one coil side in each half slot. The coil side at the bottom of the slot belongs to the bottom layer of the slot, and the coil side adjacent to the air gap belongs to the upper layer.
A double-layer diamond winding is constructed like the single-layer winding. There are two zone rings, the outer illustrating the bottom layer and the inner the upper layer. The distribution of zones does not have to be identical in the upper and bottom layers. The zone distribution can be shifted by a multiple of the slot pitch. A single zone shift equals a single slot pitch. By comparing the width of the coil with the coil span of the winding, we can see that the coil is now one slot pitch narrower; the coil is said to be short pitched. Because of short pitching, the coil end has become shorter, and the copper consumption is thus reduced. On the other hand, the flux linking the coil decreases somewhat because of short pitching, and therefore the number of coil turns at the same voltage has to be higher than for a full-pitch winding. The short pitching of the coil end is of more significance than the increased number of coil turns, and as a result the consumption of coil material
decreases.
Short pitching also influences the harmonics content of the flux density of the air gap. A correctly short-pitched winding produces a more sinusoidal current linkage distribution than a full-pitch winding. In a salient-pole synchronous generator, where the flux density distribution is basically governed by the shape of pole shoes, a short-pitch winding produces a more sinusoidal pole voltage than a full-pitch winding.
How much energy do wind turbines create?
Two 5MW offshore wind turbines were built on the DEWI-OCC test field in Cuxhaven, Germany in December 2006.
A:Typically a wind turbine will produce between 5 and 8% of what they are rated for on average. Thus a 5 MWh plant should be able to produce 100,000 KWh each hour they are running. Most currently built systems are rated for 1 MWh in the United States so they typically will produce about 20,000 KWh of actual power. Wind systems are rated for average winds of 28 mph. If the average wind is 14 mph, they produce 10% of rated. If wind goes over 31 mph they produce no power and can consume energy to slow the blades. Feathering of blades does asist on reducing these issues, but doesn't eliminate them. A:A wind turbine in optimal winds generates its plate capacity. For example, a typical 3 MW wind turbine will generate 3 MW of electricity. An outdated but still moderately useful rule-of-thumb was that a megawatt would power a thousand homes; consumption is higher now so it's a little less than that, but still, a single 3 megawatt wind turbine will provide power in optimal winds to power close to 3000 homes.Winds vary, however. A typical jurisdiction will see 30% on average of the plate capacity over the course of a year. Some jurisdictions, such as north-eastern Brazil, have excellent winds and see capacity factors of 50%. Wind turbines are very economically viable at 30% capacity factors and become more profitable at higher factors.
Except in very low or very high winds, wind turbines will usually be generating some electricity. They aren't just on or off.
These factors are taken into account by grid managers when planning and managing new generation, new transmission and operating the grid.
Most industrial wind turbines do take about their faceplate capacity from the grid for a few minutes at startup to get the rotors moving. This is trivial in comparison to hours, days or even weeks of continuous generation. In addition, as one wind turbine in a farm comes on line, it provides power to the very local grid to be used by the other wind turbines; the wind farm will typically boot itself up with significantly less than the number of wind turbines times the faceplate capacity from other sources.
A:Every wind turbine has a range of wind speeds, typically 30 to 55 mph, in which it will produce at its rated, or maximum, capacity. If the wind is in the ideal range for a 1.5-MW wind turbine, it will produce power at the rate of 1.5 MW, its rated, or maximum, capacity.At slower wind speeds, however, the production falls off dramatically. Industry estimates project an annual output of 30-40%, but real-world experience shows that annual outputs of 15-30% of capacity are typical.
What causes static electricity?
How does static electricity work?
1. Static electricity is the result of an imbalance between negative and positive charges in an object. These charges can build up on the surface of an object until they find a way to be released or discharged. One way to discharge them is through a circuit. The rubbing of certain materials against one another can transfer negative charges, or electrons. For example, if you rub your shoe on the carpet, your body collects extra electrons. The electrons cling to your body until they can be released. As you reach and touch your pet (dog or cat) you get a shock. It is only the extra electrons being released from you to your unsuspecting pet.
How does my hair stick up?2. As you remove your hat, electrons are transferred from hat to hair, creating that interesting hairdo! Remember, objects with the same charge repel each other. Because they have the same charge, your hair will stand on end. Your hairs are simply trying to get as far away from each other as possible! How does a balloon stick to the wall?3. When you rub a balloon against your clothes and it sticks to the wall, you are adding a extra of electrons (negative charges) to the surface of the balloon. The wall is now more positively charged than the balloon. As the two come in contact, the balloon will stick because of the rule that opposites attract (positive to negative).