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106-507: In 2016, the wind turbine manufacture business unit of Spanish conglomerate Acciona , Acciona Windpower , merged with those of Nordex to form Nordex Group . As of 2013, the third generation of Nordex wind turbines included two platforms, rated at 2.4 and 3.3 MW. In Europe, Africa and North America Nordex manufactures and sells the Gamma series, a product family comprising the N90/2500,

212-604: A duchy in 1156, and was made an Archduchy in 1453. Being the heartland of the Habsburg monarchy since the late 13th century, Austria was a major imperial power in Central Europe for centuries and from the 16th century, Vienna was also serving as the Holy Roman Empire's administrative capital. Before the dissolution of the empire two years later, in 1804, Austria established its own empire , which became

318-459: A great power and one of the largest states in Europe. The empire's defeat in wars and the loss of territories in the 1860s paved the way for the establishment of Austria-Hungary in 1867. After the assassination of Archduke Franz Ferdinand in 1914, Emperor Franz Joseph declared war on Serbia , which ultimately escalated into World War I . The empire's defeat and subsequent collapse led to

424-402: A blade length up to 80 meters (260 ft). Designs with 10 to 12 MW were in preparation in 2018, and a "15 MW+" prototype with three 118-metre (387 ft) blades is planned to be constructed in 2022. The average hub height of horizontal axis wind turbines is 90 meters. Vertical-axis wind turbines (or VAWTs) have the main rotor shaft arranged vertically. One advantage of this arrangement

530-423: A decade of Allied occupation , the country regained its sovereignty and declared its perpetual neutrality in 1955. Austria is a federal parliamentary republic and representative democracy with a popularly elected president as head of state and a chancellor as head of government and chief executive. Austria has the 13th highest nominal GDP per capita with high standards of living. The country has been

636-530: A full replacement by carbon fiber would save 80% of weight but increase costs by 150%, while a 30% replacement would save 50% of weight and increase costs by 90%. Hybrid reinforcement materials include E-glass/carbon, E-glass/aramid. The current longest blade by LM Wind Power is made of carbon/glass hybrid composites. More research is needed about the optimal composition of materials. Austria – in Europe  (green & dark grey) – in

742-441: 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

848-412: A greater friction moment and thus a lower power coefficient. The air velocity is the major contributor to the turbine efficiency. This is the reason for the importance of choosing the right location. The wind velocity will be high near the shore because of the temperature difference between the land and the ocean. Another option is to place turbines on mountain ridges. The higher the wind turbine will be,

954-474: A lower blade speed ratio, which lowers blade bending stresses. Straight, V, or curved blades may be used. 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

1060-800: A member of the United Nations since 1955 and of the European Union since 1995. It hosts the Organization for Security and Co-operation in Europe (OSCE) and the Organization of the Petroleum Exporting Countries (OPEC) and is a founding member of the Organisation for Economic Co-operation and Development (OECD) and Interpol . It also signed the Schengen Agreement in 1995, and adopted

1166-581: A problem with their national identity and prompted the Social Democratic Leader Otto Bauer to state that it was "the conflict between our Austrian and German character". The Austro-Hungarian Empire caused ethnic tension between the German Austrians and the other ethnic groups. Many Austrians, especially those involved with the pan-German movements, desired a reinforcement of an ethnic German identity and hoped that

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1272-720: A referendum which confirmed the union with Germany in April 1938. Parliamentary elections were held in Germany (including recently annexed Austria) on 10 April 1938. They were the final elections to the Reichstag during Nazi rule, and they took the form of a single-question referendum asking whether voters approved of a single Nazi-party list for the 813-member Reichstag, as well as the recent annexation of Austria (the Anschluss ). Jews, Roma and Sinti were not allowed to vote. Turnout in

1378-521: A result, ruling Austria-Hungary became increasingly difficult in an age of emerging nationalist movements, requiring considerable reliance on an expanded secret police. Yet, the government of Austria tried its best to be accommodating in some respects: for example, the Reichsgesetzblatt , publishing the laws and ordinances of Cisleithania , was issued in eight languages; and all national groups were entitled to schools in their own language and to

1484-584: A series of batteries . The batteries powered various electrical tools and lamps, as well as a threshing machine. Friedländer's windmill and its accessories were prominently installed at the north entrance to the main exhibition hall (" Rotunde ") in the Vienna Prater . In July 1887, Scottish academic James Blyth installed a battery-charging machine to light his holiday home in Marykirk , Scotland. Some months later, American inventor Charles F. Brush

1590-417: A stable environment. Different materials have varying effects on the efficiency of wind turbines. In an Ege University experiment, three wind turbines, each with three blades with a diameter of one meter, were constructed with blades made of different materials: A glass and glass/carbon epoxy , glass/carbon, and glass/polyester. When tested, the results showed that the materials with higher overall masses had

1696-676: A vehement opponent of the Nazis, the last Crown Prince of Austria-Hungary, an honorary citizen of hundreds of places in Austria and partly envisaged by Schuschnigg as a monarchical option, was in Belgium at the time. He spoke out against the Anschluss and was then wanted by the Nazi regime and his property would have been expropriated and he would have been shot immediately if he were caught. In 1938,

1802-510: A year, henceforth every emperor of the Holy Roman Empire was a Habsburg, with only one exception. The Habsburgs began also to accumulate territory far from the hereditary lands. In 1477, Archduke Maximilian , only son of Emperor Frederick III , married the heiress Maria of Burgundy , thus acquiring most of the Netherlands for the family. In 1496, his son Philip the Fair married Joanna

1908-593: Is a Latinisation of the German name and was first recorded in the 12th century. At the time, the Danube basin of Austria ( Upper and Lower Austria ) was the easternmost extent of Bavaria. The area that is now Austria was settled in pre-Roman times by various Celtic tribes, having been the core of the Hallstatt culture by the 6th century BC . The city of Hallstatt , in fact, has the oldest archaeological evidence of

2014-419: Is a major drawback. Vertical turbine designs have much lower efficiency than standard horizontal designs. 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

2120-484: Is an integral part of the German reich" (Article 2). The Treaty of Saint Germain and the Treaty of Versailles explicitly forbade union between Austria and Germany. The treaties also forced German-Austria to rename itself as "Republic of Austria" which consequently led to the first Austrian Republic . Over three million German-speaking Austrians found themselves living outside the new Austrian Republic as minorities in

2226-431: 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: "Eggbeater" turbines, or Darrieus turbines, were named after

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2332-623: 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 turbine blades contain up to 75% glass by weight. This increases the stiffness, tensile and compression strength. A promising composite material is glass fiber with modified compositions like S-glass, R-glass etc. Other glass fibers developed by Owens Corning are ECRGLAS, Advantex and WindStrand. Carbon fiber has more tensile strength, higher stiffness and lower density than glass fiber. An ideal candidate for these properties

2438-553: Is now Austria's National Day , a public holiday. The status of Tyrol was a lingering problem between Austria and Italy . To this day, there are 20 different squares in Austrian cities called "Südtiroler Platz" (South Tyrolean Square) in memory of the supposed loss of the Austrian territories. Terrorist acts by the South Tyrolean independence movement have been documented in the 1950s and 1960s. A great degree of autonomy

2544-574: Is often used as a rooftop wind turbine and has even been adapted for ships . Airborne wind turbines consist of wings or a small aircraft tethered to the ground. They are useful for reaching faster winds above which traditional turbines can operate. There are prototypes in operation in east Africa. These are offshore wind turbines that are supported by a floating platform. By having them float, they are able to be installed in deeper water allowing more of them. This also allows them to be further out of sight from land and therefore less public concern about

2650-520: 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

2756-448: Is the spar cap, a structural element of a blade that experiences high tensile loading. A 100-metre (330 ft) glass fiber blade could weigh up to 50 tonnes (110,000 lb), while using carbon fiber in the spar saves 20% to 30% weight, about 15 tonnes (33,000 lb). Instead of making wind turbine blade reinforcements from pure glass or pure carbon, hybrid designs trade weight for cost. For example, for an 8-metre (26 ft) blade,

2862-601: The Austrofascists imposed a new constitution ("Maiverfassung") which cemented Dollfuss's power, but on 25 July he was assassinated in an Austrian Nazi coup attempt . His successor Kurt Schuschnigg acknowledged the fact that Austria was a "German state" and he also believed that Austrians were "better Germans" but he wished that Austria would remain independent. He announced a referendum on 9 March 1938, to be held on 13 March, concerning Austria's independence from Germany. On 12 March 1938, Austrian Nazis took over

2968-965: The Battle of Königgrätz , Austria had to leave the German Confederation and no longer took part in German politics. After the defeated Hungarian Revolution of 1848 , the Austro-Hungarian Compromise of 1867 , the Ausgleich , provided for a dual sovereignty, the Austrian Empire and the Kingdom of Hungary , under Franz Joseph I . The Austrian-Hungarian rule of this diverse empire included various groups, including Germans , Hungarians , Croats, Czechs, Poles , Rusyns , Serbs, Slovaks, Slovenes, and Ukrainians, as well as large Italian and Romanian communities. As

3074-761: The Empire of Austria was founded. From 1792 to 1801, the Austrians had suffered 754,700 casualties. In 1814, Austria was part of the Allied forces that invaded France and brought to an end the Napoleonic Wars . It emerged from the Congress of Vienna in 1815 as one of the continent's four dominant powers and a recognised great power . The same year, the German Confederation ( Deutscher Bund )

3180-648: The European Union  (green)  –  [ Legend ] Austria , formally the Republic of Austria , is a landlocked country in Central Europe , lying in the Eastern Alps . It is a federation of nine states , one of which is the capital, Vienna , the most populous city and state. Austria is bordered by Germany to the northwest, the Czech Republic to the north, Slovakia to

3286-527: The Federal Constitutional Law of 1920, which had been terminated by dictator Dollfuss on 1 May 1934, was declared valid again. The total number of Austrian military deaths from 1939 to 1945 was 260,000. The total number of Jewish Austrian Holocaust victims was 65,000. About 140,000 Jewish Austrians had fled from the country in 1938–39. Thousands of Austrians had taken part in serious Nazi crimes (hundreds of thousands of people died in

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3392-471: The Franks , conquered the area in 788, encouraged colonisation, and introduced Christianity. As part of Eastern Francia , the core areas that now encompass Austria were bequeathed to the house of Babenberg . The area was known as the marchia Orientalis and was given to Leopold of Babenberg in 976. The first record showing the name Austria is from 996, where it is written as Ostarrîchi , referring to

3498-645: The German Empire of 1848 , the crown of the newly formed empire was offered to the Prussian King Friedrich Wilhelm IV . In 1864, Austria and Prussia fought together against Denmark and secured the independence from Denmark of the duchies of Schleswig and Holstein . As they could not agree on how the two duchies should be administered, though, they fought the Austro-Prussian War in 1866. Defeated by Prussia in

3604-671: The House of Habsburg . Charles VI was willing to offer concrete advantages in territory and authority in exchange for recognition of the Pragmatic Sanction of 1713 . Therefore, his daughter Maria Theresa was recognized as his heir. With the rise of Prussia , the Austria–Prussia rivalry began in Germany. Austria participated, together with Prussia and Russia, in the first and the third of the three Partitions of Poland in 1772 and 1795 respectively. From that time, Austria became

3710-554: The Long War of 1593 to 1606. The Turks made incursions into Styria nearly 20 times, of which some are cited as "burning, pillaging, and taking thousands of slaves". In late September 1529, Suleiman the Magnificent launched the first siege of Vienna , which unsuccessfully ended, according to Ottoman historians, with the snowfalls of an early beginning winter. During the long reign of Leopold I, Holy Roman Emperor following

3816-832: The Mauthausen-Gusen concentration camp alone), a fact which was officially acknowledged by Chancellor Franz Vranitzky in 1992. Allied-occupied Austria was after World War II divided into military occupation zones. Austria was governed by the Allied Commission for Austria . As stipulated in the Moscow Declaration of 1943 a subtle difference was seen in the treatment of Austria by the Allies. The Austrian government, consisting of Social Democrats, Conservatives, and Communists resided in Vienna , which

3922-677: The Romans in the late 1st century BC. Christianization in the region began in the 4th and 5th centuries, during the late Roman period , followed by the arrival of numerous Germanic tribes during the Migration Period . Austria, as a unified state, emerged from the remnants of the Eastern and Hungarian March at the end of the first millennium , first as a frontier march of the Holy Roman Empire , it then developed into

4028-538: The euro currency in 1999. The native name for Austria, Österreich , derives from the Old High German Ostarrîchi , which meant "eastern realm" and which first appeared in the "Ostarrîchi document" of 996. This word is probably a translation of Medieval Latin Marchia orientalis into a local (Bavarian) dialect. Austria was a prefecture of Bavaria created in 976. The word "Austria"

4134-428: The "lowest relative greenhouse gas emissions, the least water consumption demands and the most favorable social impacts" compared to photovoltaic , hydro , geothermal , coal and gas energy sources. Smaller wind turbines are used for applications such as battery charging and remote devices such as traffic warning signs. Larger turbines can contribute to a domestic power supply while selling unused power back to

4240-501: The 11th and 12th centuries; 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

4346-564: 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

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4452-650: The Americans, planned for the supposed "Alpine Fortress Operation" of a national redoubt, that was largely to have taken place on Austrian soil in the mountains of the Eastern Alps . However, it never materialised because of the rapid collapse of the Reich. Karl Renner and Adolf Schärf (Socialist Party of Austria [Social Democrats and Revolutionary Socialists]), Leopold Kunschak (Austria's People's Party [former Christian Social People's Party]), and Johann Koplenig (Communist Party of Austria) declared Austria's secession from

4558-521: 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 alter the aerodynamic profile and essentially reduce 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

4664-623: The Celts in Europe. The Celtic Kingdom of Noricum that included most of modern Austria and parts of modern Slovenia was conquered by the Roman Empire in 16 BC and made a province called Noricum which lasted until the year of 476. The regions of today's Austria which were not located within the province of Noricum were divided between the Roman provinces of Pannonia , which encompassed parts of eastern Austria, and Raetia , which encompassed

4770-470: 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

4876-446: The German Austrians from Germany, many Austrian pan-Germans idolised him and wore blue cornflowers, known to be the favourite flower of German Emperor William I , in their buttonholes, along with cockades in the German national colours (black, red, and yellow), although they were both temporarily banned in Austrian schools, as a way to show discontent towards the multi-ethnic empire. Austria's exclusion from Germany caused many Austrians

4982-561: The Mad , the heiress of Castile and Aragon , thus acquiring Spain and its Italian, African, Asian , and New World appendages for the Habsburgs. In 1526, following the Battle of Mohács , Bohemia and the part of Hungary not occupied by the Ottomans came under Austrian rule. Ottoman expansion into Hungary led to frequent conflicts between the two empires, particularly evident in

5088-525: The N100/2500 and the N117/2400. The N90/2500 is a turbine being developed for strong winds. The N100/2500 consists of two versions, Highspeed and Lowspeed, the first one for rather windy locations, the second for medium wind conditions. The N117/2400 was designed especially for low-wind regions (IEC 3). The hub height of the 2.4-2.5 MW windturbines reaches from 65 meters for the N90/2500 to 141 meters for

5194-812: The N117 being slightly upgraded to withstand the higher wind speeds in IEC wind class 2a. Both turbines are equipped with a three-stage gearbox and a doubly fed asynchronous generator. Wind turbine A wind turbine is a device that converts the kinetic energy of wind into electrical energy . As of 2020 , hundreds of thousands of large turbines , in installations known as wind farms , were generating over 650 gigawatts of power, with 60 GW added each year. Wind turbines are an increasingly important source of intermittent renewable energy , and are used in many countries to lower energy costs and reduce reliance on fossil fuels . One study claimed that, as of 2009, wind had

5300-518: The Nazis renamed Austria the " Ostmark ", a name which it had until 1942, when it was renamed the "Alpine and Danubian Gaue" (Alpen-und Donau-Reichsgaue). Though Austrians made up only 8% of the population of the Third Reich, some of the most prominent Nazis were native Austrians, including Adolf Hitler , Ernst Kaltenbrunner , Arthur Seyss-Inquart , Franz Stangl , Alois Brunner , Friedrich Rainer , and Odilo Globocnik , as were over 13% of

5406-550: The Provisional National Assembly for German Austria ( Provisorische Nationalversammlung für Deutschösterreich ). On 30 October the assembly founded the Republic of German-Austria by appointing a government, called Staatsrat . This new government was invited by the Emperor to take part in the decision on the planned armistice with Italy but refrained from this business. This left the responsibility for

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5512-676: The Social Democrats and the Conservatives, had paramilitary armies; the Social Democrats' Republikanischer Schutzbund was now declared illegal, but was still operative as the 12–15 February 1934 Austrian Civil War broke out. In February 1934, several members of the Schutzbund were executed, the Social Democratic party was outlawed, and many of its members were imprisoned or emigrated. On 1 May 1934,

5618-520: The Third Reich by the Declaration of Independence on 27 April 1945 and set up a provisional government in Vienna under state Chancellor Renner the same day, with the approval of the victorious Red Army and backed by Joseph Stalin . (The date is officially named the birthday of the second republic.) At the end of April, most of western and southern Austria were still under Nazi rule. On 1 May 1945,

5724-414: The United States from 5 kilowatts (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, use of wind turbines in rural areas was declining as the distribution system extended to those areas. A forerunner of modern horizontal-axis wind generators was in service at Yalta , USSR, in 1931. This

5830-443: The air arrives at the turbine. The maximum theoretical power output of a wind machine is thus 16 ⁄ 27 times the rate at which kinetic energy of the air arrives at 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

5936-436: The areas of present-day Vorarlberg and Tyrol . Present-day Petronell- Carnuntum in eastern Austria was an important army camp turned capital city in what became known as the Pannonia Superior . Carnuntum was home to 50,000 people for nearly 400 years. After the fall of the Roman Empire , the area was first invaded by the Germanic Rugii which made this region part of their " Rugiland ". In 487, most of modern Austria

6042-427: The birthplace of classical music and played host to different composers including Joseph Haydn , Wolfgang Amadeus Mozart , Ludwig van Beethoven , and Franz Schubert . Austria later became engaged in a war with Revolutionary France , which was highly unsuccessful in the beginning, with successive defeats at the hands of Napoleon Bonaparte , meaning the end of the old Holy Roman Empire in 1806. Two years earlier,

6148-430: 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

6254-469: The blades snapped off. 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 . In the early 1970s, however, anti-nuclear protests in Denmark spurred artisan mechanics to develop microturbines of 22 kW despite declines in the industry. Organizing owners into associations and co-operatives led to

6360-414: The blades upwind of the tower ( i.e.   blades facing the incoming wind) produce the overwhelming majority of wind power 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

6466-682: The currency, and improve Austria's general economic condition. The loan meant that Austria passed from an independent state to the control exercised by the League of Nations. In 1925, the Austrian schilling was introduced, replacing the Krone at a rate of 10,000:1. Later, it was nicknamed the "Alpine dollar" due to its stability. From 1925 to 1929 the economy enjoyed a short high before nearly crashing after Black Tuesday . The First Austrian Republic lasted until 1933, when Chancellor Engelbert Dollfuss , using what he called "self-switch-off of Parliament" , established an autocratic regime tending towards Italian fascism . The two big parties at this time,

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6572-458: The election was officially 99.5%, with 98.9% voting "yes". In the case of Austria, Adolf Hitler's native soil, 99.71% of an electorate of 4,484,475 officially went to the ballots, with a positive tally of 99.73 percent. Although most Austrians favored the Anschluss , in certain parts of Austria, the German soldiers were not always welcomed with flowers and joy, especially in Vienna, which had Austria's largest Jewish population. Nevertheless, despite

6678-496: The empire would collapse, which would allow an annexation of Austria by Germany . A lot of Austrian pan-German nationalists protested passionately against minister-president Kasimir Count Badeni 's language decree of 1897, which made German and Czech co-official languages in Bohemia and required new government officials to be fluent in both languages. This meant in practice that the civil service would almost exclusively hire Czechs because most middle-class Czechs spoke German but not

6784-495: The end of the war, on 3 November 1918, solely to the emperor and his government. On 11 November, the emperor, advised by ministers of the old and the new governments, declared he would not take part in state business any more; on 12 November, German-Austria, by law, declared itself to be a democratic republic and part of the new German republic. The constitution, renaming the Staatsrat as Bundesregierung (federal government) and Nationalversammlung as Nationalrat (national council)

6890-414: The energy converted to electrical energy. Since outgoing wind will still possess some kinetic energy, there must be a maximum proportion of the input energy that is available to be converted to electrical energy. Accordingly, Betz's law gives the maximal achievable extraction of wind power by a wind turbine, known as Betz's coefficient, as 16 ⁄ 27 (59.3%) of the rate at which the kinetic energy of

6996-453: The factors affecting the final price of wind power. Further inefficiencies, such as gearbox , 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 as the cube of wind speed, further reducing theoretical efficiency. In 2001, commercial utility-connected turbines delivered 75% to 80% of

7102-998: The generator, is 15.24 meters (50.0 ft) and weighs around 300 tons. 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 equipment. 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. Generally, efficiency increases along with turbine blade lengths. The blades must be stiff, strong, durable, light and resistant to fatigue. Materials with these properties include composites such as polyester and epoxy, while glass fiber and carbon fiber have been used for

7208-442: The government, while German troops occupied the country, which prevented Schuschnigg's referendum from taking place. On 13 March 1938, the Anschluss ( lit.   ' joining ' or ' connection ' ) of Austria was officially declared. Two days later, Austrian-born Adolf Hitler announced what he called the "reunification" of his home country with the "rest of the German Reich " on Vienna's Heldenplatz . He established

7314-426: The hands of Rudolph I of Germany in 1278. Thereafter, until World War I, Austria's history was largely that of its ruling dynasty, the Habsburgs . In the 14th and 15th centuries, the Habsburgs began to accumulate other provinces in the vicinity of the Duchy of Austria. In 1438, Duke Albert V of Austria was chosen as the successor to his father-in-law, Emperor Sigismund . Although Albert himself only reigned for

7420-411: The higher the wind velocity on average. A windbreak can also increase the wind velocity near the turbine. 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. Household-size vertical designs produce less power and are less common. Large three-bladed horizontal-axis wind turbines (HAWT) with

7526-706: 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. It has been argued that expanding the use of wind power will lead to increasing geopolitical competition over critical materials for wind turbines, such as rare earth elements neodymium , praseodymium , and dysprosium . However, this perspective has been critically dismissed for failing to relay how most wind turbines do not use permanent magnets and for underestimating

7632-700: The low wind version of the N117/2400. In 2013 Nordex launched the Delta-Class-Series, entering series production in January 2014 with prototypes installed in mid-2013. There will be two new types of turbines, the N100/3300 strong-wind turbine and the N117/3000, which is designed for medium-wind sites. Both turbines feature the rotorblades already used in the Gamma-Series, with the rotorblades of

7738-556: The members of the SS and 40% of the staff at the Nazi extermination camps . In the Reichsgau , besides the main camp KZ-Mauthausen , there were numerous sub-camps in all provinces where Jews and other prisoners were killed, tortured and exploited. At this time, because the territory was outside the operational radius of Allied aircraft, the armaments industry was greatly expanded through the forced labor of concentration camp prisoners, this

7844-589: The newly formed or enlarged states of Czechoslovakia , Yugoslavia , Hungary , and Italy. These included the provinces of South Tyrol , and German Bohemia . The status of German Bohemia and Sudetenland later played a role in World War II. The border between Austria and the Kingdom of Yugoslavia was settled with the Carinthian Plebiscite in October 1920 and allocated the major part of

7950-523: The northeast, Hungary to the east, Slovenia and Italy to the south, and Switzerland and Liechtenstein to the west. The landlocked country occupies an area of 83,879 km (32,386 sq mi) and has a population of around 9 million. The area of today's Austria has been inhabited since at least the Paleolithic period . Around 400 BC, it was inhabited by the Celts and then annexed by

8056-562: The other half saw a production decrease of 1.2% per year. In general, more stable and constant weather conditions (most notably wind speed) result in an average of 15% greater efficiency than that of a wind turbine in unstable weather conditions, thus allowing up to a 7% increase in wind speed under stable conditions. This is due to a faster recovery wake and greater flow entrainment that occur in conditions of higher atmospheric stability. However, wind turbine wakes have been found to recover faster under unstable atmospheric conditions as opposed to

8162-846: The other way around. The support of ultramontane Catholic politicians and clergy for this reform triggered the launch of the Away from Rome movement, which was initiated by supporters of Schönerer and called on "German" Christians to leave the Roman Catholic Church. As the Second Constitutional Era began in the Ottoman Empire , Austria-Hungary took the opportunity to annex Bosnia and Herzegovina in 1908. The assassination of Archduke Franz Ferdinand in Sarajevo in 1914 by Bosnian Serb Gavrilo Princip

8268-439: The power of economic incentives for the expanded production of these minerals. 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

8374-452: The predominantly German-speaking South Tyrol . The desire for the annexation of Austria to Germany was a popular opinion shared by all social circles in both Austria and Germany. On 12 November, German-Austria was declared a republic, and named Social Democrat Karl Renner as provisional chancellor. On the same day it drafted a provisional constitution that stated that "German-Austria is a democratic republic" (Article 1) and "German-Austria

8480-524: The proclamation of the Republic of German-Austria in 1918 and the First Austrian Republic in 1919. During the interwar period , anti-parliamentarian sentiments culminated in the formation of an Austrofascist dictatorship under Engelbert Dollfuss in 1934. A year before the outbreak of World War II , Austria was annexed into Nazi Germany by Adolf Hitler , and it became a sub-national division . After its liberation in 1945 and

8586-559: The propaganda and the manipulation and rigging which surrounded the ballot box result, there was massive genuine support for Hitler for fulfilling the Anschluss , since many Germans from both Austria and Germany saw it as completing the long overdue unification of all Germans into one state. On 13 March 1938, Austria was annexed by the Third Reich and ceased to exist as an independent country (the Anschluss ). The Aryanisation of

8692-469: 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". There is also the pseudo direct drive mechanism, which has some advantages over the permanent magnet direct drive mechanism. Most horizontal axis turbines have their rotors upwind of

8798-435: The reinforcing. Construction may involve manual layup or injection molding. Retrofitting existing turbines with larger blades reduces the task and risks of redesign. As of 2021, the longest blade was 115.5 m (379 ft), producing 15 MW. Blades usually last around 20 years, the typical lifespan of a wind turbine. Materials commonly used in wind turbine blades are described below. The stiffness of composites

8904-436: The rotor. Solidity is measured by the blade area divided by the rotor area. 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

9010-587: The successful defence of Vienna against the Turks in 1683, under the command of the King of Poland John III Sobieski , the Great Turkish War resulted in most of Hungary being controlled by Austria. This arrangement was formalized in the Treaty of Karlowitz in 1699. Charles VI, Holy Roman Emperor relinquished many of the gains the empire made in the previous years. He enjoyed the imminent extinction of

9116-420: The 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, downwind blades can also be designed to bend more than upwind ones, which reduces their swept area and thus their wind resistance, mitigating risk during gales. Despite these advantages, upwind designs are preferred, because the pulsing change in loading from

9222-684: The territory of the Babenberg March. In 1156, the Privilegium Minus elevated Austria to the status of a duchy. In 1192, the Babenbergs also acquired the Duchy of Styria . With the death of Frederick II in 1246, the line of the Babenbergs was extinguished. As a result, Ottokar II of Bohemia effectively assumed control of the duchies of Austria, Styria, and Carinthia . His reign came to an end with his defeat at Dürnkrut at

9328-592: The territory of the former Austro-Hungarian Crownland of Carinthia to Austria. This set the border on the Karavanke mountain range, with many Slovenes remaining in Austria. After the war, inflation began to devalue the Krone, which was still Austria's currency. In the autumn of 1922, Austria was granted an international loan supervised by the League of Nations . The purpose of the loan was to avert bankruptcy, stabilise

9434-433: The use of their mother tongue at state offices. Many Austrians of all different social circles such as Georg Ritter von Schönerer promoted strong pan-Germanism in the hope of reinforcing an ethnic German identity and the annexation of Austria to Germany. Some Austrians such as Karl Lueger also used pan-Germanism as a form of populism to further their own political goals. Although Bismarck's policies excluded Austria and

9540-490: The utility supplier via the electrical grid . Wind turbines are manufactured in a wide range of sizes, with either horizontal or vertical axes, though horizontal is most common. The windwheel of Hero of Alexandria (10–70 CE) marks one of the first recorded instances of wind powering a machine. However, the first known practical wind power plants were built in Sistan , an Eastern province of Persia (now Iran), from

9646-554: The visual appeal. Wind turbine design is a careful balance of cost, energy output, and fatigue life. Wind turbines convert wind energy to electrical energy for distribution. Conventional horizontal axis turbines can be divided into three components: 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) measures about 80 meters (260 ft) in diameter. The nacelle , which contains

9752-792: The wealth of Jewish Austrians started immediately in mid-March, with a so-called "wild" (i.e. extra-legal) phase, but it was soon structured legally and bureaucratically so the assets which Jewish citizens possessed could be stripped from them. At that time, Adolf Eichmann , who grew up in Austria, was transferred to Vienna and ordered to persecute the Jews. During the November pogrom in 1938 ("Reichskristallnacht"), Jews and Jewish institutions such as synagogues were subjected to violent attacks in Vienna, Klagenfurt, Linz, Graz, Salzburg, Innsbruck and several cities in Lower Austria. Otto von Habsburg ,

9858-514: 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

9964-406: 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. Conservation of mass requires that the mass of air entering and exiting a turbine must be equal. Likewise, the conservation of energy requires the energy given to the turbine from incoming wind to be equal to that of the combination of the energy in the outgoing wind and

10070-471: 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 about five years before one of

10176-858: Was able to build the first automatically operated wind turbine after consulting local University professors and his colleagues Jacob S. Gibbs and Brinsley Coleberd and successfully getting the blueprints peer-reviewed for electricity production. 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. 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 megawatts (MW). The largest machines were on 24-metre (79 ft) towers with four-bladed 23-metre (75 ft) diameter rotors. By 1908, there were 72 wind-driven electric generators operating in

10282-420: Was able to send the Allies information about armaments factories where V-1 flying bombs , V-2 rockets , Tiger tanks , and aircraft ( Messerschmitt Bf 109 , Messerschmitt Me 163 Komet , etc.) were manufactured, information which was important to the success of Operation Crossbow and Operation Hydra , both of which were preliminary missions before the launch of Operation Overlord . This resistance group, which

10388-719: Was conquered by Odoacer , a barbarian soldier and statesman from the Middle Danube , which incorporated most of today's Austria in his Kingdom of Italy . By 493, it was conquered by the Germanic Ostrogoths which created their own kingdom, the Ostrogothic Kingdom . Following the Kingdom's fall the area was invaded by the Alemanni , Baiuvarii , Slavs , and Avars . Charlemagne , King of

10494-580: Was especially the case with regard to the manufacture of fighter planes, tanks and missiles. Most of the resistance groups were soon crushed by the Gestapo . While the plans of the group around Karl Burian to blow up the Gestapo's headquarters in Vienna were uncovered, the important group around the later executed priest Heinrich Maier managed to contact the Allies . This so-called Maier-Messner group

10600-459: Was founded under the presidency of Austria. Because of unsolved social, political, and national conflicts, the German lands were shaken by the 1848 revolutions aiming to create a unified Germany. The various different possibilities for a united Germany were: a Greater Germany , or a Greater Austria or just the German Confederation without Austria at all. As Austria was not willing to relinquish its German-speaking territories to what would become

10706-559: Was in contact with the American secret service ( OSS ), soon provided information about mass executions and concentration camps such as Auschwitz . The group's aim was to cause Nazi Germany to lose the war as quickly as possible and re-establish an independent Austria. Vienna fell on 13 April 1945, during the Soviet Vienna offensive , just before the total collapse of the Third Reich. The invading Allied powers, in particular

10812-579: Was installed by the Austrian Josef Friedländer at the Vienna International Electrical Exhibition in 1883. It was a Halladay windmill for driving a dynamo . Friedländer's 6.6 m (22 ft) diameter Halladay "wind motor" was supplied by U.S. Wind Engine & Pump Co. of Batavia , Illinois . The 3.7 kW (5 hp) windmill drove a dynamo at ground level that fed electricity into

10918-536: Was passed on 10 November 1920. The Treaty of Saint-Germain of 1919 (for Hungary the Treaty of Trianon of 1920) confirmed and consolidated the new order of Central Europe which to a great extent had been established in November 1918, creating new states and altering others. The German-speaking parts of Austria which had been part of Austria-Hungary were reduced to a rump state named the Republic of German-Austria (German: Republik Deutschösterreich ), though excluding

11024-596: Was responsible for directing the nationalized industries under the directorship of Minister Peter Krauland (party ÖVP). On 15 May 1955, after talks which lasted for years and were influenced by the Cold War Austria regained full independence by concluding the Austrian State Treaty with the allies of World War II. On 26 October 1955, all occupation troops had left and Austria declared its permanent neutrality by an act of parliament. This day

11130-599: Was surrounded by the Soviet zone. This Austrian government was recognised by the allies of World War II in October 1945 despite concerns that Karl Renner could be Stalin's puppet. On 26 July 1946 the Austrian Parliament passed its first nationalization law and approximately 70 mining and manufacturing companies were seized by the Austrian state. The Ministry of Property Protection and Economic Planning ( Ministerium für Vermögenssicherung und Wirtschaftsplanung )

11236-606: Was used by leading Austrian politicians and generals to persuade the emperor to declare war on Serbia, thereby risking and prompting the outbreak of World War I, which eventually led to the dissolution of the Austro-Hungarian Empire. Over one million Austro-Hungarian soldiers died in World War I. On 21 October 1918, the elected German members of the Reichsrat (parliament of Imperial Austria) met in Vienna as

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