In the wind turbine business there are basically two types of turbines to choose from, vertical axis wind turbines and horizontal axis wind turbines. They both have their advantages and disadvantages and the purpose of this article is to help you choose the right system for your application.
Horizontal axis wind turbine dominate the majority of the wind industry. Horizontal axis means the rotating axis of the wind turbine is horizontal, or parallel with the ground. In big wind application, horizontal axis wind turbines are almost all you will ever see. However, in small wind and residential wind applications, vertical axis turbines have their place. The advantage of horizontal wind is that it is able to produce more electricity from a given amount of wind. So if you are trying to produce as much wind as possible at all times, horizontal axis is likely the choice for you. The disadvantage of horizontal axis however is that it is generally heavier and it does not produce well in turbulent winds.
I am convinced the oil industry pushes so hard on horizontal turbines because vertical will cut deep into their greasy pockets. The spend a fortune keeping them out of the market because if we begin using them, they will lose 100 times their fortunes.
I don''t understand why vertical turbines are not more common. Because it generates some more power.The only reason the would not be more common is because it needs more material’s. Or it needs gas, coal or anything like that.
I don’t understand why vertical turbines are not more common. They appear to be way more efficient than horizontal turbines. There are now horizontal turbines with no moving parts where the blades just resonate in order to produce energy.
We have a Conifer ‘Totem Pole’ in the garden of our residential area house. Basically a tree we had topped and all braches gut off now with vine type flowers covering it. It is approx 25 ft+ tall and I am thinking of puing a small wind generator on top of it, but can’t decide which axis. VA seems favourite as the roofs appear to be causing more turbulent than stable air flow. Open to suggestions?
I remember seeing vertical axis turbines where the generator is on the ground and curved sails run vertically like an egg beater. They turned continuously with winds under five mph, from any direction, since the vertical sails were wrapped in a gradual spiral, with six sails per turbine. I saw them outside Livermore Labs back in 1995. What, did propeller manufacturers push to get their propellers used instead of better designs?
Good information which enables to choose proper type of air turbine to produce electric power more efficiently. It helps me to design moni air turbines.
Windmills do work, wind turbines produce electricity. If you’re planning on putting a windmill on a roof, it might not do you much good. As for the design, it sounds completely doable
I am thinking of making a rotor for Vertical axis wind mill which will appear just like the rotor of an exhaust fan. It will be made odAcrylic sheets and vanes may be of FRP or Acrylic. If it works I hope it may be suitable to mount on almost every building roof top. Has any one tried it? Is it practcable?A.M.Oke E
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Horizontal wind turbines dominate the landscape, but did you know that there arevertical wind turbinesas well? You don''t see them as often, because they aren''t usedon an industrial scale like horizontal turbines. Still, vertical turbines do have their advantages, which we will go into more depth in this article. But what exactly separates horizontal and vertical wind turbines?
In short, what truly classifies horizontal and vertical turbines is their orientation relative to the wind. Horizontal turbines spin on an axis that is parallel to the direction of the wind, while vertical turbines are oriented perpendicular to the direction of the wind.
Horizontal access wind turbines, or HAWTs, are what you think of when you think of a wind turbine. They make up the majority of industrial-sized turbines and can be identified by their propeller-like design.horizontal turbines are the most efficient type of turbine, hence their use in large-scale wind farms.
blades are made of composite materialswhich are, unfortunately,difficult to recycle. The wind strikes the blades and creates a pressure differential which turns the rotor and generates electricity. The generator and gearbox are located right behind the rotor in the nacelle. The rotor plane must maintain a 180-degree angle with the wind direction to maintain maximum efficiency, and so HAWTs are equipped with a wind vane and yaw system which keep the turbine facing the right direction.
Vertical access wind turbines, or VAWTs, are identifiable by their eggbeater-like design as they rotate around a vertical shaft. Like horizontal turbines, they have a gearbox and generator, though they are located at ground level at the base of the turbine. Although horizontal turbines have become the norm (the very first recorded windmill was actually a vertical turbine), vertical turbines are more commonly used on a smaller scale than HAWTs, usuallyused to provide supplemental power to residential buildings, homes, or boats. Though there are a few VAWTs that are used for industrial-scale wind power, they are few and far between. Vertical turbines are omnidirectional and can generate power no matter which way the wind is blowing.
There are two types of VAWTs;Darrieus and Savonius turbines. An easy way to remember the difference is that Darrieus turbines are lift-type turbines, while Savonius turbines are drag-type turbines. While the two may look similar, they''re actually very different in the way they operate and generate electricity. (You might even suggest that the most modern innovations in wind energy –bladeless turbines– are also VAWTs.)
Darrieus turbines use lift to generate electricity. Like HAWTs, they have blades shaped like aerofoils. The blades of a Darrieus turbine are connected to a central shaft that rotates in response to the wind. Some Darrieus turbines have curved blades which connect at the top and bottom of the shaft, while others have straight blades which connect at the center. Some even have a double-helix design, where the blades curve around the central shaft.
Darrieus turbines are usually used on a small scale, like on rooftops or parking lots to generate supplemental electricity. Some are used on an industrial scale, though they''re not the preferred design as they aren''t as efficient and suffer from structural instabilities at large sizes. Large Darrieus turbines usually need guy wires to maintain stability, meaning thatthey take up more space than is optimal. The largest Darrieus turbine is rated at 4 MW ''s located in Quebec and is affectionately named Éole.
Savonius turbines are similar in appearance to Darrieus turbines, but they use drag to generate electricity instead of lift. They can be identified by their use of scoops instead of blades, which are attached to a central shaft. Using drag to provide power is much less efficient, but the Savonius turbine does have plenty of practical uses.
Savonius turbines are cheap and easy to maintain, and are often used for low energy applications in remote locations. Deep ocean buoys, communications towers, or water pumps might all use a Savonius turbine for power. Their reliability and simplicity also make them useful as anemometers. Horizontal turbines typically use small Savonius turbines as anemometers to measure wind speed, which are typically attached to the top of the nacelle.
Read also: Assessment of Onshore and Offshore Windpower
While the differences between horizontal and vertical turbines may seem obvious to some, they vary in more than just looks. The contrasts between the two make for huge functional differences and decide where and how each turbine can be used.
Horizontal turbines are more suited to capture sustained high-quality winds. They''re placed high up onlarge towersto capture the stronger wind at higher altitudes. Since they have to rotate to face the breeze, horizontal turbines don''t do well in gusty winds with variable wind directions. Vertical turbines, on the other hand, are omnidirectional,so they are more efficient than HAWTs when it comes to gusty weather where the wind blows from all directions.That makes them well equipped to generate power in urban areas, where buildings and tall structures create variable wind patterns.
Horizontal and vertical turbines also differ in where the mechanical parts are places on the turbine. Horizontal turbines keep all of their working parts high up on the top of the tower. This makes maintenance more difficult as workers have to scale the tower to address mechanical issues. The working parts of a vertical turbine are all stored at the base, close to the ground, making repairs easier and less hazardous.
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