For a 1.5-MW turbine, typical blades should measure 110 ft to 124 ft (34m to 38m) in length, weigh 11,500 lb/5,216 kg and cost roughly $100,000 to $125,000 each. Rated at 3.0 MW, a turbine’s blades are about 155 ft/47m in length, weigh about 27,000 lb/12,474 kg and are valued at roughly $250,000 to $300,000 each.Jun 1, 2008
There are several disadvantages of heavier wind turbine blades, one being they are substantial pieces of mechanical materials and can have lengths of up to 180 feet. … Wind turbine blades that are heavy in structure and weight are more expensive to manufacture and assemble.
An average blade repair (offshore) can cost up to $30 000 (for onshore blades, it can be two times less) and a new blade costs, on average, about $200 000.
One of the most common turbines, the GE 1.5-megawatt model, has 116-foot blades on a 212-foot tower, while the Vestas V90 has 148-foot blades on a 262-foot tower. The GE 1.5-megawatt model weighs in at more than 164 tons; the tower alone weighs about 71 tons. The total weight of the Vestas V90 is about 267 tons.
The blades may range from as small as 4 feet to as long as 50 feet and be mounted on a metal lattice tower up to 165 feet (50 meters) tall. When one of the blades is sticking straight up, these turbines can average 120-200 feet in height.
A typical slab foundation for a 1 MW turbine would be approximately 15 m diameter and 1.5 – 3.5 m deep. Turbines in the 1 to 2 MW range typically use 130 to 240 m3 of concrete for the foundation.
In the United States, the direct land use for wind turbines comes in at three-quarters of an acre per megawatt of rated capacity. That is, a 2-megawatt wind turbine would require 1.5 acres of land.
|Working Wind Speed||3-25m/s (6.72-56 mph)|
|MAX.Design Wind Speed||50m/s (112mph)|
|Tower Height||8m(26.24ft)higher available|
The blades of the wind turbines are 120 feet long so that the total height from the ground to the tip of the blade is more than 380 feet, approximately the height of a 32-story building.
At a 33% capacity factor, that average turbine would generate over 402,000 kWh per month – enough for over 460 average U.S. homes. To put it another way, the average wind turbine generates enough energy in 94 minutes to power an average U.S. home for one month.
The answer, according to the American Wind Energy Association, is that it takes somewhere in the range of 200 to 230 tons of steel to make a single wind turbine.
Check the Oil
Gearboxes on the generally smaller-sized turbines installed in the mid-1980s hold about 10 gallons of oil or less. Newer, larger machines might hold as much as 60 gallons.
Windtechs must lift heavy equipment, parts, and tools, some of which weigh in excess of 50 pounds. Troubleshooting skills. Windtechs must diagnose and repair problems.
For a 5-megawatt turbine, the steel alone averages 150 metric tons for the reinforced concrete foundations, 250 metric tons for the rotor hubs and nacelles (which house the gearbox and generator), and 500 metric tons for the towers.
In general, foundations are usually simple concrete blocks called footings that are placed under building walls and columns, or in the case of wind turbines, beneath the tower. … Wind turbines are most often mounted on towers that can be 80 meters (260 feet) or more in height.
Wind lease terms vary quite a bit, but general rules of thumb are: $4,000 to $8,000 per turbine, $3,000 to $4,000 per megawatt of capacity, or 2-4% of gross revenues.
How Much Will a Wind Farm Lease Pay Me? On average, rental payments for the placement of a single wind turbine lease can pay landowners up to $8,000 per year. Thus, wind farming can quickly become quite valuable, especially for larger locations that can host several hundred wind turbines.
Each of the landowners whose fields either host turbines or who are near enough to receive a “good neighbor” payment, can earn $3,000 to $7,000 yearly for the small area – about the size of a two-car garage – each turbine takes up.
Large-scale turbines typically rotate at 20 rpm, while domestic sized turbines tend to revolve at roughly 400 rpm. In most large-scale turbines, the low speed shaft is connected to a gearbox. The gearbox increases the rotational speed of the shaft, up to 1200-1800 rpm.
“There are lots of different parts of the wind turbine that need to be lubricated, using lubrications from greases to gearbox fluids to hydraulic oils.” Keeping a wind turbine’s gearbox properly lubricated is important in extending the life of a wind turbine, Rushton said.
Moreover, given the limited levels of EMF measured around the wind farm, human exposure to EMF from wind turbines is negligible in comparison to common household exposures.
A modern blade is often designed to taper from root to tip. This gives a good starting torque from the wide part while reducing drag at the faster moving tip. … The blades extract power from the wind, thereby slowing it, and this slow wind behind the turbine causes the wind in front of the turbine to spill around it.
|Annual average energy production:||2,450KWH (in average 5m/s wind speed)|
|working wind speed:||3-25m/s (6.7-55.9 mph)|
|Initial wind speed:||2.5m/s (5.6 mph)|
|System size||Indicative system cost||Approx. yearly system output*|
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