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Saturday, January 5, 2019

Mind-blindness

From Wikipedia, the free encyclopedia

Mind-blindness is a concept of a cognitive divergence where an individual is unable to attribute mental states to others. As a result of this kind of social and empathetic cognitive phenomenon, the individual is incapable in putting themselves "into someone else's shoes" and cannot conceptualize, understand or predict knowledge, thoughts and beliefs, emotions, feelings and desires, behaviour, actions and intentions of another person. Such an ability to develop a mental awareness of what is in the other minds is known as the theory of mind (ToM),autistic. In addition to autism, ToM and mind-blindness research has recently been extended to other fields such as schizophrenia, dementia, bipolar disorders, antisocial personality disorders as well as normal aging.

Relevance and causes

Theory of mind

Mind-blindness is a state where the ToM has not been developed, or has been lost in an individual. According to the theory, ToM is implicit in neurotypical individuals. This enables one to make automatic interpretations of events taking into consideration the mental states of people, their desires and beliefs. Simon Baron-Cohen described how an individual lacking a ToM would perceive the world in a confusing and frightening manner, leading to a withdrawal from society.

An alternative approach to the social impairment observed in mind-blindness focuses on emotion of subjects. Based on empirical evidence, Uta Frith concluded that the processing of complex cognitive emotions is impaired compared to simpler emotions. In addition, attachment does not seem to fail in the early childhood of autistics. This suggests that emotion is a component of social cognition that is separable from mentalizing.

Lombardo and Cohen updated the theory and pinpointed some additional factors that play an important part in ToM of autistic people. They highlighted that the middle cingulate cortex which is outside the traditional mentalizing region was underactive in autistic patients, while the rest of ToM activation was normal. This region was important in deciding how much to invest in a person and hence required mentalization.

Biological basis

Neural correlates of the ToM point towards three regions of the brains. The anterior paracingulate cortex (Brodmann), is considered at the key region of mentalizing. It is located anterior corpus callosum and the anterior cingulate cortex. This cortex is associated with the medial frontal cortex where activation is associated with the mentalization of states. The cells of the ACC develops at the age of 4 months suggesting that the manifestations of mind-blindness may occur around this time.

In addition to the anterior paracingulate cortex is the superior temporal sulcus and the temporal poles that are involved with the ToM and its nature. However, these areas are not uniquely associated with mentalization. They aid in the activation of the regions that are associated with the ToM. The superior temporal sulcus is involved in the processing of behavioural information while the temporal poles are involved in the retrieval of personal experiences. These are considered important regions for the activation of the ToM regions and are associated with the mind-blindness. The temporal poles provide personal experiences for mentalization such as facial recognition, emotional memory and familiar voices. In patients suffering from semantic dementia, the temporal regions of these patients undergo atrophy and lead to certain deficits which can cause mind-blindness.

Superior temporal sulcus
 
The amygdala and the orbitofrontal cortex also are a part of the ToM. It is in involved in the interpretation of behaviour which plays an important role in social cognition and therefore contributes to the theory of the mind. It is suspected that the damage to the orbitofrontal cortex brings upon subtle impairments, but not a total loss of the ToM that would to mind-blindness. Some studies have shown that the orbitofrontal cortex is not directly associated with the theory of the mind or mind-blindness. However, a study by Stone and colleagues were able to show impaired ToM on mentalization tasks.

Since the frontal lobe is associated with executive function, researchers theorize that the frontal lobe plays an important role in ToM and its associated nature. It has also been suggested that the executive function and the theory of mind share the same regions. Despite the fact that ToM and mind-blindness can explain executive function deficits, it is argued that autism is not identified with the failure of the executive function.

Lesion studies show that when lesions are imposed to the medial frontal lobe, performance on mentalization tasks is reduced, similar to typical mind-blindness cases. Patients that experienced frontal lobe injuries due to severe head trauma showed signs of mind blindness, as a result of a lost ToM. However, it is still debated whether the inactivation of the medial frontal lobe is involved in mind-blindness.

Frith and Frith proposed that a neural network that comprised the medial prefrontal cortex, the anterior cingulate cortex and the STS, is crucial for the normal functioning of ToM and self monitoring. This so formed dorsal system is crucial for social cognition. Disruption of this neural network leads to mind-blindness in schizophrenic individuals.

Another clue towards a possible explanation of mind-blindness in autistics was done by Castelli and colleagues. They were able to show that the connectivity between occipital and the temporo-parietal regions were weaker in the autistic group than the control group. The under activation of this network may inhibit the interactive influences between regions that process higher and lower perceptual items.

Relationship to diagnostic criteria

Relationship to autism

Mind-blindness is usually associated with autistic people. Lower performance on the mentalization tasks were the first screening task used to diagnose the autism, with a good prediction level.

Cohen proposed the mind-blindness theory of autism as "deficits in the normal process of empathising". He described empathising to include the ToM, mind reading and taking an intentional stance. According to this view empathising includes the ability to attribute mental states and to react in an appropriate emotional manner which is appropriate to another's mental state. More deficits tend to occur in reference to one's own mental states compared to the other's mental states. It has been proposed that autistic people undergo a specific developmental delay in the area of metarepresentational development. The delay facilitates mind-blindness.

There is some evidence that suggests that certain patients develop a rudimentary ToM and do not suffer from complete lack of ToM causing mind-blindness. A study by Bowler concluded that mind-blindness and social impairment is not as straightforward as previously thought. It showed that a complete possession of ToM was not enough to protect from social impairments in autistic people. Conversely the absence or impairment of the ToM that leads to mind-blindness does not lead to social impairments.

The social and cognitive differences seen in autistic people are often attributed due to mind blindness. Abnormal behaviour of autistic children are perceived to include a lack of reciprocity. Some cases in which mind-blindness manifests includes the child being totally withdrawn from social settings as well as not being able to make eye contact while in other cases the individual may attempt to interact with other people. However, global asocial behaviors is not the rule in autism. Cohen described the cognitive/mind-blindness effects in autistic people as a "triad of deficits". The triad consists of deficits in social, communication and imagination of others' minds.

Ozonoff and colleagues were able to discriminate between autistic people diagnosed with Asperger's syndrome and other autistic people by their ability to solve ToM tasks. It is due to those diagnosed with AS seem more neurotypical in development early on in childhood. The siblings of individuals diagnosed with AS were shown to have a lesser variant of ToM deficits. This shows that the cognitive deficits that affect the ToM play central role in the phenotype expressed in AS diagnosed.

Relationship to schizophrenia

People with schizophrenia also show deficits associated with mind-blindness. However, there is an ongoing debate as to whether individuals with schizophrenia have an impaired ToM leading to mind-blindness or display an exaggerated ToM. Unlike autism, schizophrenia is a late onset condition. It is speculated that this difference in the condition may account for differences seen in the ToM abilities. Brain lesion studies show that there are differences seen in the laterality of brain that account for mind-blindness. It is unknown whether the ToM in schizophrenia deteriorates in the affected person as the condition progresses.

The cognitive impairment linked to mind-blindness is best explained by a modular theory; the domain specific capabilities that account for mindreading and mentalization are lost in schizophrenia. Furthermore, Frith has predicted that the extent of mind-blindness depends on whether the objective/behavioural or subjective symptoms of ToM abilities prevail. Patients with the behavioural symptoms perform the poorest in ToM tasks, similar to autistic subjects, while patients displaying subjective/experiential symptoms have a ToM. However, these patients are impaired in using contextual information to infer what these mental states are.

Criticism

The mind-blindness theory helps to explain the impairment in the social development of individuals as well as the impairment in the communication skills of autistics. However one of the most important limitations of this theory is that it is unable to explain the highly repetitive behaviours which is a characteristic trait attributed to autistic people. This triad is explained through the process of systemising. The theory also did not account for the motor problems and the superior rote memory skills that were associated with autism. These aspects along with the highly repetitive behaviours formed the triad of strengths. Simon Baron-Cohen himself has acknowledged that the theory, while adept at explaining the communications difficulties experienced by autistic people, fails to explain such patients' penchants for narrowly defined interests, an important step to proper diagnosis. Furthermore, mind-blindness seems decidedly non-unique to autistic people, since conditions ranging from schizophrenia to various narcissistic personality disorders and/or anti-social personality disorders all exhibit mind-blindness to some degree.

Another issue associated with the mind-blindness theory is that researchers are unable to predict whether the social deficits are a primary or secondary result of mind-blindness. In addition, Klin and his fellow researchers highlighted another limitation that was that the mind-blindness theory failed to delineate whether the ToM deficits are a generalised deficit or a specific discrete of a mechanism. Stuart Shanker also argued in favour of Klin's argument, that a major part of the mind-blindness theory depicts the ToM as an autonomous cognitive capacity compared to being part of a more general ability for reflective thinking and empathy.

A boy with autism, obsessively stacking cans.
 
Other researchers have pointed out the inherent flaws of assuming autistic traits develops from a "theory of mind" deficit, pointing out that this presupposes autistic traits derives from a single, core insufficiency within the brain. This contrasts, they say, with the very same researchers' description of autism as a "puzzle", which implies a far more diverse range of causes than a single, unifying theory.

Many have also pointed out that Mind-blindness wrongly categorizes autism as a problem to be fixed, rather than a condition to be accommodated. This assumes an inherent lack of intelligence in autistic people, which ignores the nuanced view of intelligence (as in varying types of intelligence) that has been observed in cognitive research.

The drawbacks in the Mind-blindness theory of autistic people paved way for the E-S theory which helps to explain the observations seen in these individuals. The E-S theory accounts for both the triad of deficits which is the loss of empathising and the triad of strengths is related to hyper systemisation of certain behaviours. The theory also helps to explain the exaggerated male spectrum termed as the extreme male behavior.

Wind turbine

From Wikipedia, the free encyclopedia

Thorntonbank Wind Farm, using 5 MW turbines REpower 5M in the North Sea off the coast of Belgium.
 
A wind turbine, or alternatively referred to as a wind energy converter, is a device that converts the wind's kinetic energy into electrical energy

Wind turbines are manufactured in a wide range of vertical and horizontal axis. The smallest turbines are used for applications such as battery charging for auxiliary power for boats or caravans or to power traffic warning signs. Slightly larger turbines can be used for making contributions to a domestic power supply while selling unused power back to the utility supplier via the electrical grid. Arrays of large turbines, known as wind farms, are becoming an increasingly important source of intermittent renewable energy and are used by many countries as part of a strategy to reduce their reliance on fossil fuels. One assessment claimed that, as of 2009, wind had the "lowest relative greenhouse gas emissions, the least water consumption demands and... the most favourable social impacts" compared to photovoltaic, hydro, geothermal, coal and gas.

History

James Blyth's electricity-generating wind turbine, photographed in 1891
 
The windwheel of Hero of Alexandria (10 AD – 70 AD) marks one of the first recorded instances of wind powering a machine in history. However, the first known practical wind power plants were built in Sistan, an Eastern province of Persia (now Iran), from the 7th century. These "Panemone" were vertical axle windmills, which had long vertical drive shafts with rectangular blades. Made of six to twelve sails covered in reed matting or cloth material, these windmills were used to grind grain or draw up water, and were used in the gristmilling and sugarcane industries.

Wind power first appeared in Europe during the Middle Ages. The first historical records of their use in England date to the 11th or 12th centuries and there are reports of German crusaders taking their windmill-making skills to Syria around 1190. By the 14th century, Dutch windmills were in use to drain areas of the Rhine delta. Advanced wind turbines were described by Croatian inventor Fausto Veranzio. In his book Machinae Novae (1595) he described vertical axis wind turbines with curved or V-shaped blades. 

The first electricity-generating wind turbine was a battery charging machine installed in July 1887 by Scottish academic James Blyth to light his holiday home in Marykirk, Scotland. Some months later American inventor Charles F. Brush was able to build the first automatically operated wind turbine after consulting local University professors and colleagues Jacob S. Gibbs and Brinsley Coleberd and successfully getting the blueprints peer-reviewed for electricity production in Cleveland, Ohio. Although Blyth's turbine was considered uneconomical in the United Kingdom, electricity generation by wind turbines was more cost effective in countries with widely scattered populations.

The first automatically operated wind turbine, built in Cleveland in 1887 by Charles F. Brush. It was 60 feet (18 m) tall, weighed 4 tons (3.6 metric tonnes) and powered a 12 kW generator.
 
In Denmark by 1900, there were about 2500 windmills for mechanical loads such as pumps and mills, producing an estimated combined peak power of about 30 (MW). The largest machines were on 24-meter (79 ft) towers with four-bladed 23-meter (75 ft) diameter rotors. By 1908 there were 72 wind-driven electric generators operating in the United States from 5 kW to 25 kW. Around the time of World War I, American windmill makers were producing 100,000 farm windmills each year, mostly for water-pumping.

By the 1930s, wind generators for electricity were common on farms, mostly in the United States where distribution systems had not yet been installed. In this period, high-tensile steel was cheap, and the generators were placed atop prefabricated open steel lattice towers.

A forerunner of modern horizontal-axis wind generators was in service at Yalta, USSR in 1931. This was a 100 kW generator on a 30-meter (98 ft) tower, connected to the local 6.3 kV distribution system. It was reported to have an annual capacity factor of 32 percent, not much different from current wind machines.

In the autumn of 1941, the first megawatt-class wind turbine was synchronized to a utility grid in Vermont. The Smith-Putnam wind turbine only ran for 1,100 hours before suffering a critical failure. The unit was not repaired, because of a shortage of materials during the war. 

The first utility grid-connected wind turbine to operate in the UK was built by John Brown & Company in 1951 in the Orkney Islands.

Despite these diverse developments, developments in fossil fuel systems almost entirely eliminated any wind turbine systems larger than supermicro size. In the early 1970s, however, anti-nuclear protests in Denmark spurred artisan mechanics to develop microturbines of 22 kW. Organizing owners into associations and co-operatives lead to the lobbying of the government and utilities and provided incentives for larger turbines throughout the 1980s and later. Local activists in Germany, nascent turbine manufacturers in Spain, and large investors in the United States in the early 1990s then lobbied for policies that stimulated the industry in those countries.

Resources

Wind Power Density (WPD) is a quantitative measure of wind energy available at any location. It is the mean annual power available per square meter of swept area of a turbine, and is calculated for different heights above ground. Calculation of wind power density includes the effect of wind velocity and air density.

Wind turbines are classified by the wind speed they are designed for, from class I to class III, with A to C referring to the turbulence intensity of the wind. 

Class Avg Wind Speed (m/s) Turbulence
IA 10 16%
IB 10 14%
IC 10 12%
IIA 8.5 16%
IIB 8.5 14%
IIC 8.5 12%
IIIA 7.5 16%
IIIB 7.5 14%
IIIC 7.5 12%

Efficiency

Conservation of mass requires that the amount of air entering and exiting a turbine must be equal. Accordingly, Betz's law gives the maximal achievable extraction of wind power by a wind turbine as 16/27 (59.3%) of the total kinetic energy of the air flowing through the turbine.

The maximum theoretical power output of a wind machine is thus 16/27 times the kinetic energy of the air passing through the effective disk area of the machine. If the effective area of the disk is A, and the wind velocity v, the maximum theoretical power output P is:
,
where ρ is the air density

Wind-to-rotor efficiency (including rotor blade friction and drag) are among the factors impacting the final price of wind power. Further inefficiencies, such as gearbox losses, generator and converter losses, reduce the power delivered by a wind turbine. To protect components from undue wear, extracted power is held constant above the rated operating speed as theoretical power increases at the cube of wind speed, further reducing theoretical efficiency. In 2001, commercial utility-connected turbines deliver 75% to 80% of the Betz limit of power extractable from the wind, at rated operating speed.

Efficiency can decrease slightly over time, one of the main reasons being dust and insect carcasses on the blades which alters the aerodynamic profile and essentially reduces the lift to drag ratio of the airfoil. Analysis of 3128 wind turbines older than 10 years in Denmark showed that half of the turbines had no decrease, while the other half saw a production decrease of 1.2% per year. Ice accretion on turbine blades has also been found to greatly reduce the efficiency of wind turbines, which is a common challenge in cold climates where in-cloud icing and freezing rain events occur. Vertical turbine designs have much lower efficiency than standard horizontal designs.

Types

The three primary types: VAWT Savonius, HAWT towered; VAWT Darrieus as they appear in operation
 
Wind turbines can rotate about either a horizontal or a vertical axis, the former being both older and more common. They can also include blades, or be bladeless. Vertical designs produce less power and are less common.

Horizontal axis

Components of a horizontal axis wind turbine (gearbox, rotor shaft and brake assembly) being lifted into position
 
A turbine blade convoy passing through Edenfield, England
 
Offshore Horizontal Axis Wind Turbines (HAWTs) at Scroby Sands Wind Farm, England
 
Onshore Horizontal Axis Wind Turbines in Zhangjiakou, China
 
Large three-bladed horizontal-axis wind turbines (HAWT), with the blades upwind of the tower produce the overwhelming majority of windpower in the world today. These turbines have the main rotor shaft and electrical generator at the top of a tower, and must be pointed into the wind. Small turbines are pointed by a simple wind vane, while large turbines generally use a wind sensor coupled with a yaw system. Most have a gearbox, which turns the slow rotation of the blades into a quicker rotation that is more suitable to drive an electrical generator. Some turbines use a different type of generator suited to slower rotational speed input. These don't need a gearbox, and are called direct-drive, meaning they couple the rotor directly to the generator with no gearbox in between. While permanent magnet direct-drive generators can be more costly due to the rare earth materials required, these gearless turbines are sometimes preferred over gearbox generators because they "eliminate the gear-speed increaser, which is susceptible to significant accumulated fatigue torque loading, related reliability issues, and maintenance costs."

One Energy in Findlay, OH assembles one of their permanent magnet direct-drive wind turbines.
The rotor of a gearless wind turbine being set. This particular turbine was prefabricated in Germany, before being shipped to the U.S. for assembly.
 
Most horizontal axis turbines have their rotors upwind of its supporting tower. Downwind machines have been built, because they don't need an additional mechanism for keeping them in line with the wind. In high winds, the blades can also be allowed to bend which reduces their swept area and thus their wind resistance. Despite these advantages, upwind designs are preferred, because the change in loading from the wind as each blade passes behind the supporting tower can cause damage to the turbine. 

Turbines used in wind farms for commercial production of electric power are usually three-bladed. These have low torque ripple, which contributes to good reliability. The blades are usually colored white for daytime visibility by aircraft and range in length from 20 to 80 meters (66 to 262 ft). The size and height of turbines increase year by year. Offshore wind turbines are built up to 8(MW) today and have a blade length up to 80 meters (260 ft). Usual tubular steel towers of multi megawatt turbines have a height of 70 m to 120 m and in extremes up to 160 m.

Vertical axis

A vertical axis Twisted Savonius type turbine.
 
Vertical-axis wind turbines (or VAWTs) have the main rotor shaft arranged vertically. One advantage of this arrangement is that the turbine does not need to be pointed into the wind to be effective, which is an advantage on a site where the wind direction is highly variable. It is also an advantage when the turbine is integrated into a building because it is inherently less steerable. Also, the generator and gearbox can be placed near the ground, using a direct drive from the rotor assembly to the ground-based gearbox, improving accessibility for maintenance. However, these designs produce much less energy averaged over time, which is a major drawback.

The key disadvantages include the relatively low rotational speed with the consequential higher torque and hence higher cost of the drive train, the inherently lower power coefficient, the 360-degree rotation of the aerofoil within the wind flow during each cycle and hence the highly dynamic loading on the blade, the pulsating torque generated by some rotor designs on the drive train, and the difficulty of modelling the wind flow accurately and hence the challenges of analysing and designing the rotor prior to fabricating a prototype.

When a turbine is mounted on a rooftop the building generally redirects wind over the roof and this can double the wind speed at the turbine. If the height of a rooftop mounted turbine tower is approximately 50% of the building height it is near the optimum for maximum wind energy and minimum wind turbulence. While wind speeds within the built environment are generally much lower than at exposed rural sites, noise may be a concern and an existing structure may not adequately resist the additional stress. 

Subtypes of the vertical axis design include:

Darrieus wind turbine

"Eggbeater" turbines, or Darrieus turbines, were named after the French inventor, Georges Darrieus. They have good efficiency, but produce large torque ripple and cyclical stress on the tower, which contributes to poor reliability. They also generally require some external power source, or an additional Savonius rotor to start turning, because the starting torque is very low. The torque ripple is reduced by using three or more blades which results in greater solidity of the rotor. Solidity is measured by blade area divided by the rotor area. Newer Darrieus type turbines are not held up by guy-wires but have an external superstructure connected to the top bearing.

Giromill

A subtype of Darrieus turbine with straight, as opposed to curved, blades. The cycloturbine variety has variable pitch to reduce the torque pulsation and is self-starting. The advantages of variable pitch are: high starting torque; a wide, relatively flat torque curve; a higher coefficient of performance; more efficient operation in turbulent winds; and a lower blade speed ratio which lowers blade bending stresses. Straight, V, or curved blades may be used.

Savonius wind turbine

These are drag-type devices with two (or more) scoops that are used in anemometers, Flettner vents (commonly seen on bus and van roofs), and in some high-reliability low-efficiency power turbines. They are always self-starting if there are at least three scoops. 

Twisted Savonius is a modified savonius, with long helical scoops to provide smooth torque. This is often used as a rooftop windturbine and has even been adapted for ships.

Parallel

The parallel turbine is similar to the crossflow fan or centrifugal fan. It uses the ground effect. Vertical axis turbines of this type have been tried for many years: a unit producing 10 kW was built by Israeli wind pioneer Bruce Brill in the 1980s.

Unconventional types

Counter rotating wind turbine
 
Highway wind turbine

Design and construction

Components of a horizontal-axis wind turbine
 
Inside view of a wind turbine tower, showing the tendon cables.
 
Wind turbine design is a careful balance of cost, energy output, and fatigue life. These factors are balanced using a range of computer modelling techniques.

Components

Wind turbines convert wind energy to electrical energy for distribution. Conventional horizontal axis turbines can be divided into three components:
  • The rotor, which is approximately 20% of the wind turbine cost, includes the blades for converting wind energy to low speed rotational energy.
  • The generator, which is approximately 34% of the wind turbine cost, includes the electrical generator, the control electronics, and most likely a gear box (e.g. planetary gear box), adjustable-speed drive or continuously variable transmission component for converting the low-speed incoming rotation to high-speed rotation suitable for generating electricity.
  • The surrounding structure, which is approximately 15% of the wind turbine cost, includes the tower and rotor yaw mechanism.
Nacelle of a wind turbine
 
A 1.5 (MW) wind turbine of a type frequently seen in the United States has a tower 80 meters (260 ft) high. The rotor assembly (blades and hub) weighs 22,000 kilograms (48,000 lb). The nacelle, which contains the generator, weighs 52,000 kilograms (115,000 lb). The concrete base for the tower is constructed using 26,000 kilograms (58,000 lb) reinforcing steel and contains 190 cubic meters (250 cu yd) of concrete. The base is 15 meters (50 ft) in diameter and 2.4 meters (8 ft) thick near the center.

Turbine monitoring and diagnostics

Due to data transmission problems, structural health monitoring of wind turbines is usually performed using several accelerometers and strain gages attached to the nacelle to monitor the gearbox and equipments. Currently, digital image correlation and stereophotogrammetry are used to measure dynamics of wind turbine blades. These methods usually measure displacement and strain to identify location of defects. Dynamic characteristics of non-rotating wind turbines have been measured using digital image correlation and photogrammetry. Three dimensional point tracking has also been used to measure rotating dynamics of wind turbines.

Materials and recent developments

Materials that are typically used for the rotor blades in wind turbines are composites, as they tend to have a high stiffness, high strength, high fatigue resistance, and low weight. Typical resins used for these composites include polyester and epoxy, while glass and carbon fibers have been used for the reinforcing material. Construction may use manual layup techniques or composite resin injection molding. As the price of glass fibers is only about one tenth the price of carbon fiber, glass fiber is still dominant.

New designs

As competition in the wind market increases, companies are seeking ways to draw greater efficiency from their designs. One of the predominant ways wind turbines have gained performance is by increasing rotor diameters, and thus blade length. Retrofitting current turbines with larger blades mitigates the need and risks associated with a system-level redesign. As the size of the blade increases, its tendency to deflect also increases. Thus, from a materials perspective, the stiffness-to-weight is of major importance. As the blades need to function over a 100 million load cycles over a period of 20–25 years, the fatigue life of the blade materials is also of utmost importance. By incorporating carbon fiber into parts of existing blade systems, manufacturers may increase the length of the blades without increasing their overall weight. For instance, the spar cap, a structural element of a turbine blade, commonly experiences high tensile loading, making it an ideal candidate to utilize the enhanced tensile properties of carbon fiber in comparison to glass fiber. Higher stiffness and lower density translates to thinner, lighter blades offering equivalent performance. In a 10 (MW) turbine—which will become more common in offshore systems by 2021—blades may reach over 100 m in length and weigh up to 50 metric tons when fabricated out of glass fiber. A switch to carbon fiber in the structural spar of the blade yields weight savings of 20 to 30 percent, or approximately 15 metric tons.

Materials for blades

Some of the most common materials which are being used for turbine blades now and will be in the future are summarized below:

Glass and carbon fibers

The stiffness of composites is determined by the stiffness of fibers and their volume content. Typically, E-glass fibers are used as main reinforcement in the composites. Typically, the glass/epoxy composites for wind blades contain up to 75 weight % glass. This increases the stiffness, tensile and compression strength. A promising source of the composite materials in the future is glass fibers with modified compositions like S-glass, R-glass etc. Some other special glasses developed by Owens Corning are ECRGLAS, Advantex and most recently WindStrand glass fibers. 

Hybrid reinforcements

These include E-glass/carbon, E-glass/aramid and they present an exciting alternative to pure glass or carbon reinforcements. that the full replacement would lead to 80% weight savings, and cost increase by 150%, while a partial (30%) replacement would lead to only 90% cost increase and 50% weight reduction for 8 m turbine. The world currently longest wind turbine rotor blade, the 88.4 m long blade from LM Wind Power is made of carbon/glass hybrid composites. However, additional investigations are required for the optimal composition of the materials 

Nano-engineered polymers and composites

Additions of small amount (0.5 weight %) of nanoreinforcement (carbon nanotubes or nanoclay in the polymer matrix of composites, fiber sizing or interlaminar layers can allow to increase the fatigue resistance, shear or compressive strength as well as fracture toughness of the composites by 30–80%. Research has also shown that the incorporation of small amount of carbon nanotubes/CNT can increase the lifetime up to 1500%.

Costs

While the material cost is significantly lower for all-glass fiber blades than for hybrid glass/carbon fiber blades, there is a potential for tremendous savings in manufacturing costs when labor price is considered. Utilizing carbon fiber enables for simpler designs that use less raw material. The chief manufacturing process in blade fabrication is the layering of plies. By reducing the number of layers of plies, as is enabled by thinner blade design, the cost of labor may be decreased, and in some cases, equate to the cost of labor for glass fiber blades.

Other materials

Materials for wind turbine parts other than the rotor blades (including the rotor hub, gearbox, frame, and tower) are largely composed of steel. Modern turbines use a couple of tons of copper for generators, cables, and such. Smaller wind turbines have begun incorporating more aluminum based alloys into these components in an effort to make the turbines lighter and more efficient, and may continue to be used increasingly if fatigue and strength properties can be improved. Prestressed concrete has been increasingly used for the material of the tower, but still requires much reinforcing steel to meet the strength requirement of the turbine. Additionally, step-up gearboxes are being increasingly replaced with variable speed generators, increasing the demand for magnetic materials in wind turbines. In particular, this would require an increased supply of the rare earth metal neodymium.

Recycling

Interest in recycling blades varies in different markets and depends on the waste legislation and local economics. A challenge in recycling blades is related to the composite material, which is made of a thermosetting matrix and glass fibers or a combination of glass and carbon fibers. Thermosetting matrix cannot be remolded to form new composites. So the options are either to reuse the blade and the composite material elements as they are found in the blade or to transform the composite material into a new source of material. In Germany, wind turbine blades are commercially recycled as part of an alternative fuel mix for a cement factory.

Supply

A study of the material consumption trends and requirements for wind energy in Europe found that bigger turbines have a higher consumption of precious metals but lower material input per kW generated. The current material consumption and stock was compared to input materials for various onshore system sizes. In all EU countries the estimates for 2020 exceeded and doubled the values consumed in 2009. These countries would need to expand their resources to be able to meet the estimated demand for 2020. For example, currently the EU has 3% of world supply of fluorspar and it requires 14% by 2020. Globally, the main exporting countries are South Africa, Mexico and China. This is similar with other critical and valuable materials required for energy systems such as magnesium, silver and indium. In addition, the levels of recycling of these materials is very low and focusing on that could alleviate issues with supply in the future. It is important to note that since most of these valuable materials are also used in other emerging technologies, like LEDs, PVs and LCDs, it is projected that demand for them will continue to increase.

A report by the United States Geological Survey estimated the projected materials requirement in order to fulfill the US commitment to supplying 20% of its electricity from wind power by 2030. They did not address requirements for small turbines or offshore turbines since those were not widely deployed in 2008, when the study was created. They found that there are increases in common materials such as cast iron, steel and concrete that represent 2–3% of the material consumption in 2008. Between 110,000 and 115,000 metric tons of fiber glass would be required annually, equivalent to 14% of consumption in 2008. They did not see a high increase in demand for rare metals compared to available supply, however rare metals that are also being used for other technologies such as batteries which are increasing its global demand need to be taken into account. Land, whbich might not be considered a material, is an important resource in deploying wind technologies. Reaching the 2030 goal would require 50,000 square kilometers of onshore land area and 11,000 square kilometers of offshore. This is not considered a problem in the US due to its vast area and the ability to use land for farming and grazing. A greater limitation for the technology would be the variability and transmission infrastructure to areas of higher demand.

Permanent magnets for wind turbine generators contain rare earth metals such as Nd, Pr, Tb, and Dy. Systems that use magnetic direct drive turbines require higher amounts of rare metals. Therefore, an increase in wind production would increase the demand for these resources. It is estimated that the additional demand for Nd in 2035 may be 4,000 to 18,000 tons and Dy could see an increase of 200 to 1200 tons. These values represent a quarter to half of current production levels. However, since technologies are developing rapidly, driven by supply and price of materials these estimated levels are extremely uncertain.

Reliance on rare earth minerals for components has risked expense and price volatility as China has been main producer of rare earth minerals (96% in 2009) and had been reducing its export quotas of these materials. In recent years, however, other producers have increased production of rare earth minerals and China has removed its reduced export quota on rare earths leading to an increased supply and decreased cost of rare earth minerals, increasing the viability of the implementation of variable speed generators in wind turbines on a large scale.

Due to increased technology and wide implementation, the global glass fiber market might reach US$17.4 billion by 2024, compared to US$8.5 billion in 2014. Since it is the most widely used material for reinforcement in composites around the globe, the expansion of end use applications such as construction, transportation and wind turbines has fueled its popularity. Asia Pacific held the major share of the global market in 2014 with more than 45% volume share. However China is currently the largest producer. The industry receives subsidies from the Chinese government allowing them to export it cheaper to the US and Europe. However, due to the higher demand in the near future some price wars have started to developed to implement anti dumping strategies such as tariffs on Chinese glass fiber.

Wind turbines on public display

The Nordex N50 wind turbine and visitor centre of Lamma Winds in Hong Kong, China
 
A few localities have exploited the attention-getting nature of wind turbines by placing them on public display, either with visitor centers around their bases, or with viewing areas farther away. The wind turbines are generally of conventional horizontal-axis, three-bladed design, and generate power to feed electrical grids, but they also serve the unconventional roles of technology demonstration, public relations, and education.

Small wind turbines

A small Quietrevolution QR5 Gorlov type vertical axis wind turbine in Bristol, England. Measuring 3 m in diameter and 5 m high, it has a nameplate rating of 6.5 kW to the grid.
 
Small wind turbines may be used for a variety of applications including on- or off-grid residences, telecom towers, offshore platforms, rural schools and clinics, remote monitoring and other purposes that require energy where there is no electric grid, or where the grid is unstable. Small wind turbines may be as small as a fifty-watt generator for boat or caravan use. Hybrid solar and wind powered units are increasingly being used for traffic signage, particularly in rural locations, as they avoid the need to lay long cables from the nearest mains connection point. The U.S. Department of Energy's National Renewable Energy Laboratory (NREL) defines small wind turbines as those smaller than or equal to 100 kilowatts. Small units often have direct drive generators, direct current output, aeroelastic blades, lifetime bearings and use a vane to point into the wind.

Larger, more costly turbines generally have geared power trains, alternating current output, flaps and are actively pointed into the wind. Direct drive generators and aeroelastic blades for large wind turbines are being researched.

Wind turbine spacing

On most horizontal wind turbine farms, a spacing of about 6–10 times the rotor diameter is often upheld. However, for large wind farms distances of about 15 rotor diameters should be more economical, taking into account typical wind turbine and land costs. This conclusion has been reached by research conducted by Charles Meneveau of the Johns Hopkins University, and Johan Meyers of Leuven University in Belgium, based on computer simulations that take into account the detailed interactions among wind turbines (wakes) as well as with the entire turbulent atmospheric boundary layer. 

Recent research by John Dabiri of Caltech suggests that vertical wind turbines may be placed much more closely together so long as an alternating pattern of rotation is created allowing blades of neighbouring turbines to move in the same direction as they approach one another.

Operability

Maintenance

Wind turbines need regular maintenance to stay reliable and available, in the best case turbines are available to generate energy 98% of the time.

Modern turbines usually have a small onboard crane for hoisting maintenance tools and minor components. However, large heavy components like generator, gearbox, blades and so on are rarely replaced and a heavy lift external crane is needed in those cases. If the turbine has a difficult access road, a containerized crane can be lifted up by the internal crane to provide heavier lifting.

Repowering

Installation of new wind turbines can be controversial. An alternative is repowering, where existing wind turbines are replaced with bigger, more powerful ones, sometimes in smaller numbers while keeping or increasing capacity.

Demolition

Older turbines were in some early cases not required to be removed when reaching the end of their life. Some still stand, waiting to be recycled or repowered.

A demolition industry develops to recycle offshore turbines at a cost of DKK 2–4 million per (MW), to be guaranteed by the owner.

Comparison with fossil-fuel turbines

Advantages

Wind turbines are generally inexpensive. They will produce electricity at between two and six cents per kilowatt hour, which is one of the lowest-priced renewable energy sources. And as technology needed for wind turbines continues to improve, the prices will decrease as well. In addition, there is no competitive market for wind energy, as it does not cost money to get ahold of wind. The main cost of wind turbines are the installation process. The average cost is between $48,000 and $65,000 to install. However, the energy harvested from the turbine will offset the installation cost, as well as provide virtually free energy for years after.

Wind turbines provide a clean energy source, emitting no greenhouse gases and no waste product. Over 1,500 tons of carbon dioxide per year can be eliminated by using a one megawatt turbine instead of one megawatt of energy from a fossil fuel. Being environmentally friendly and green is a large advantage of wind turbines.

Disadvantages

Wind turbines can be very large, reaching over 140 metres (460 ft) tall and with blades 55 metres (60 yd) long, and people have often complained about their visual impact. 

Environmental impact of wind power includes effect on wildlife, but can be mitigated if proper monitoring and mitigation strategies are implemented. Thousands of birds, including rare species, have been killed by the blades of wind turbines, though wind turbines contribute relatively insignificantly to anthropogenic avian mortality. For every bird killed by a wind turbine in the US, nearly 500,000 are killed by each of feral cats and buildings. In comparison, conventional coal fired generators contribute significantly more to bird mortality, by incineration when caught in updrafts of smoke stacks and by poisoning with emissions byproducts (including particulates and heavy metals downwind of flue gases). Further, marine life is affected by water intakes of steam turbine cooling towers (heat exchangers) for nuclear and fossil fuel generators, by coal dust deposits in marine ecosystems (e.g. damaging Australia's Great Barrier Reef) and by water acidification from combustion monoxides. 

Energy harnessed by wind turbines is intermittent, and is not a "dispatchable" source of power; its availability is based on whether the wind is blowing, not whether electricity is needed. Turbines can be placed on ridges or bluffs to maximize the access of wind they have, but this also limits the locations where they can be placed. In this way, wind energy is not a particularly reliable source of energy. However, it can form part of the energy mix, which also includes power from other sources. Notably, the relative available output from wind and solar sources is often inversely proportional (balancing)[citation needed]. Technology is also being developed to store excess energy, which can then make up for any deficits in supplies.

Records

Fuhrländer Wind Turbine Laasow, in Brandenburg, Germany, among the world's tallest wind turbines
 
Éole, the largest vertical axis wind turbine, in Cap-Chat, Quebec, Canada
Largest capacity conventional drive
The Vestas V164 has a rated capacity of 8 MW, later upgraded to 9.5 MW. The wind turbine has an overall height of 220 m (722 ft), a diameter of 164 m (538 ft), is for offshore use, and is the world's largest-capacity wind turbine since its introduction in 2014. The conventional drive train consist of a main gearbox and a medium speed PM generator. Prototype installed in 2014 at the National Test Center Denmark nearby Østerild. Series production began end of 2015.
Largest capacity direct drive
The Enercon E-126 with 7.58 MW and 127 m rotor diameter is the largest direct drive turbine. However, the turbine is the world's most powerful onshore-only wind turbine. The turbine has parted rotor blades with 2 sections for transport. The E-126 was later overtaken by the Siemens SWT-8.0-167-DD (DD being the acronym for "direct drive"), which is the most powerful offshore-only wind turbine.
Largest vertical-axis
Le Nordais wind farm in Cap-Chat, Quebec has a vertical axis wind turbine (VAWT) named Éole, which is the world's largest at 110 m. It has a nameplate capacity of 3.8 MW.
Largest 1-bladed turbine
The largest single-bladed wind turbine design to be put into complete operation is the MBB Messerschmitt Monopteros M50, with a total power output of no less than 640kW at full capacity. As far as the number of units is concerned, only three ever have been installed at an actual wind park, of which all went to the Jade Wind Park [de]
Largest 2-bladed turbine
The biggest 2-bladed turbine is built by Mingyang Wind Power in 2013. It is a SCD6.5MW offshore downwind turbine, designed by aerodyn Energiesysteme.
Largest swept area
The turbine with the largest swept area is the Samsung S7.0–171, with a diameter of 171 m, giving a total sweep of 22966 m2.
Tallest
A Nordex 3.3 MW was installed in July 2016. It has a total height of 230m, and a hub height of 164m on 100m concrete tower bottom with steel tubes on top (hybrid tower).
 
Vestas V164 was the tallest wind turbine, standing in Østerild, Denmark, 220 meters tall, constructed in 2014. It has a steel tube tower.
Highest tower
Fuhrländer installed a 2.5 MW turbine on a 160m lattice tower in 2003 (see Fuhrländer Wind Turbine Laasow and Nowy Tomyśl Wind Turbines).
Most rotors
Lagerwey has build Four-in-One, a multi rotor wind turbine with one tower and four rotors near Maasvlakte.[citation needed] In April 2016, Vestas installed a 900 kW four rotor test wind turbine at Risø, made from 4 recycled 225 kW V29 turbines.
Most productive
Four turbines at Rønland Offshore Wind Farm in Denmark share the record for the most productive wind turbines, with each having generated 63.2 GWh by June 2010.
Highest-situated
Since 2013 the world's highest-situated wind turbine was made and installed by WindAid and is located at the base of the Pastoruri Glacier in Peru at 4,877 meters (16,001 ft) above sea level. The site uses the WindAid 2.5 kW wind generator to supply power to a small rural community of micro entrepreneurs who cater to the tourists who come to the Pastoruri glacier.
Largest floating wind turbine
The world's largest—and also the first operational deep-water large-capacityfloating wind turbine is the 2.3 MW Hywind currently operating 10 kilometers (6.2 mi) offshore in 220-meter-deep water, southwest of Karmøy, Norway. The turbine began operating in September 2009 and utilizes a Siemens 2.3 MW turbine.

Gene

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