World's Largest Wind Turbine Will Be Taller Than Empire State Building
When it comes to the latest wind turbine technologies, size matters. A group of six institutions and universities is designing an offshore wind turbine that will stand 500 meters in height. That's taller than the Eiffel Tower and the Empire State Building.
The research team, led by researchers at the University of Virginia, believes that its wind turbine concept will produce 50 megawatts of peak power, or about 10 times more powerful than conventional wind turbines.
"Our mission is to conceptualize, design and demonstrate morphing technologies for 50-megawatt wind turbines that can reduce offshore levelized cost of energy by as much as 50 percent by 2025," they state.
A typical wind turbine stands around 70 meters tall with blades about 50 meters long. But the team's Segmented Ultralight Morphing Rotor dwarfs the field with rotor blades that are 200 meters long, or as long as two football fields.
"We call it the extreme scale," aerospace engineer and University of Virginia professor Eric Loth told Digital Trends. "There's nothing like it." The project is funded by the U.S. Department of Energy's Advanced Research Projects Agency.
Digital Trends reports the blades will face downward and can be assembled in small segments, making it easier to manufacture, transport and put together on site.
Loth added that the blades will also be adjustable, meaning they can fan out during peak wind conditions and contract if weather conditions are damaging.
"Like a flower, the petals are spread out, and we reach out and grab as much wind as we can," he said.
As Loth explained to Scientific American, these mega turbines will be more cost-effective than existing turbines because wind blows stronger and more steadily at greater altitudes, allowing you to "capture more energy." Furthermore, the long blades catch the wind more efficiently.
The team wants the massive structures to stand at least 80 kilometers offshore, where winds are usually to stronger and is far enough away to avoid the path of migratory birds.
The turbine's design was inspired by palm trees, whose trunks bend with the wind.
"Palm trees are really tall but very lightweight structurally, and if the wind blows hard, the trunk can bend," Loth said. "We're trying to use the same concept—to design our wind turbines to have some flexibility, to bend and adapt to the flow."
According to Scientific American, the prototype has yet to be tested. The researchers are currently designing the turbine's structure and control system and will build a mini-model this summer that stands about two meters in diameter. They plan to test a larger turbine with 20-meter-long blades in Colorado next summer.
By Harry Kretchmer
By 2030, almost a third of all the energy consumed in the European Union must come from renewable sources, according to binding targets agreed in 2018. Sweden is helping lead the way.
Sweden is a world leader in renewable energy consumption. Swedish Institute/World Bank
Naturally Warm<p>54% of Sweden's power comes from renewables, and is helped by its geography. With plenty of moving water and 63% forest cover, it's no surprise the <a href="https://sweden.se/nature/energy-use-in-sweden/#" target="_blank">two largest renewable power sources</a> are hydropower and biomass. And that biomass is helping support a local energy boom.</p><p>Heating is a key use of energy in a cold country like Sweden. In recent decades, as fuel oil taxes have increased, the country's power companies have turned to renewables, like biomass, to fuel local 'district heating' plants.</p><p>In Sweden these trace their <a href="https://www.sciencedirect.com/science/article/pii/S0360544217304140#fig3" target="_blank">origins back to 1948</a>, when a power station's excess heat was first used to heat nearby buildings: steam is <a href="https://www.sciencedirect.com/topics/engineering/district-heating-system" target="_blank">forced along a network of pipes</a> to wherever it's needed. Today, there are around 500 district heating systems across the country, from major cities to small villages, providing heat to homes and businesses.</p><p>District heating used to be fueled mainly from the <a href="https://www.sciencedirect.com/science/article/pii/S0360544217304140" target="_blank">by-products of power plants</a>, waste-to-energy plants and industrial processes. These days, however, Sweden is bringing more renewable sources into the mix. And as a result of competition, this localized form of power is now the country's<a href="https://www.sciencedirect.com/science/article/pii/S0360544217304140#fig3" target="_blank" rel="noopener noreferrer"> home-heating market leader.</a></p>
Sweden is using smart grids to turn buildings into energy producers. Huang et al/Elsevier
Energy ‘Prosumers’<p>But Sweden doesn't stop at village-level heating solutions. Its new breed of energy-generation takes hyper-local to the next level.</p><p>One example is in the city of Ludivika where 1970s flats <a href="https://www.buildup.eu/sites/default/files/content/transforming-a-residential-building-cluster-into-electricity-prosumers-in-sweden.pdf" target="_blank">have recently been retrofitted with the latest smart energy technology</a>.</p><p>48 family apartments spread across 3 buildings have been given photovoltaic solar panels, thermal energy storage and heat pump systems. A micro energy grid connects it all, and helps charge electric cars overnight.</p><p>The result is a cluster of 'prosumer' buildings, producing rather than consuming enough power for 77% of residents' needs. With <a href="http://www.diva-portal.org/smash/get/diva2:1232060/FULLTEXT01.pdf" target="_blank" rel="noopener noreferrer">high levels of smart meter usage</a>, it's a model that looks set to spread across Sweden.</p>
<div id="d7bf9" class="rm-shortcode" data-rm-shortcode-id="8757b138d5570bec9d6aad18074a429a"><blockquote class="twitter-tweet twitter-custom-tweet" data-twitter-tweet-id="1273556364263071744" data-partner="rebelmouse"><div style="margin:1em 0">Read more about Western Harbour and book a visit: https://t.co/ujSmVs9rNK 🏡🌳🌊 https://t.co/C5PuPziqIM</div> — Smart City Sweden (@Smart City Sweden)<a href="https://twitter.com/SmartCitySweden/statuses/1273556364263071744">1592474473.0</a></blockquote></div>
Scaling Up<p>A recent development by E.ON in Hyllie, a district on the outskirts of Malmö, southern Sweden, <a href="https://www.eonenergy.com/blog/2019/February/sweden-smart-city" target="_blank">has scaled up the smart grid principle</a>. Energy generation comes from local wind, solar, biomass and waste sources.</p><p>Smart grids then balance the power, react to the weather, deploying extra power when it's colder or putting excess into battery storage when it's warm. The system is not only more efficient, but bills have fallen.</p><p>Smart energy developments like those in Hyllie, Ludivika, and renewable-driven district heating, offer a radical alternative to the centralized energy systems many countries rely on today.</p><p>The EU's leaders have a challenge: how to generate 32% of energy from renewables by 2030. Sweden offers a vision of how technology and local solutions can turn a goal into a reality.</p>
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