Delft professor puts kites high on list for renewable energy

first_imgThe regulatory hurdle, however, to go with all this good news is aerial traffic. In Europe, he said that his team needs special permission since kites fly at heights that could interfere with flight routes. The University of Delft meanwhile is looking to Africa, and its rural electricity needs. Whether from the Netherlands or elsewhere, wind technologies other than turbines are likely to stay in the news, According to a July blog posting from the American Association of Petroleum Geologists, numerous private companies and government labs are working on airborne wind technologies. Makani Power, acquired by Google, has attracted attention in this regard. The company site says the Makani Airborne Wind Turbine is a tethered wing that generates power by flying in large circles where the wind is stronger and more consistent. It eliminates 90 percent of the material used in conventional wind turbines and can access winds at higher altitudes and above deep waters offshore. The company goal is “utility-scale deployment of airborne turbines in offshore wind farms.” As for cost, he said in The Guardian that wind-generated energy goes at eight cents per kilowatt hour but his team’s projections for large-scale production, with kites of several hundred square meters, would set the price at around two cents. ( —The word “kite” at the Delft University of Technology hardly means summertime fun and recreation. Rather, scientists see “kite” as an important airborne wind technology, with advantages lacking in wind turbines. The university’s kite team are encouraged by recent tests in a field near the aerospace engineering department at the university. That is where Roland Schmehl, associate professor, who has a background in computational fluid dynamics, continues to explore kite power. In terms of project scope, such kite trials are dwarfed by impressive wind turbines, but that is just the point. Schmehl believes that conventional turbines only scratch the layer of what can be available in wind as an energy resource, if kite power investigations lead to larger-scale developments. A kite can fly higher and may harness steady winds beyond the limit of conventional turbines. This is how the team describes the process:”The system is operated in periodic pumping cycles, alternating between reel-out and reel-in of the tether. During reel-out, the kite is flying figure-eight maneuvers at high speed (70 to 90 km/h). This creates a high traction force (3.1 kN at 7 m/s wind speed) which is converted into electricity by the drum and the connected 20 kW generator. When reaching the maximum tether length, the kite is de-powered by releasing the rear (steering) lines such that the whole wing rotates and aligns with the apparent wind. Using the drum/generator module as a winch, the kite is now pulled back to the initial position to start the next pumping cycle. De-powering reduces the traction force during reel-in by 80 percent and for this reason the energy consumed during reel-in is only a fraction of the energy generated during reel-out.” Credit: TU Delft Citation: Delft professor puts kites high on list for renewable energy (2013, July 13) retrieved 18 August 2019 from Explore furthercenter_img This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. More information: Guardian © 2013 Energy from the windy heights “The first time I came in contact with this technology in 2009 when I took the position at this university, it was amazing for me to see the prototype system that was built by this group, to see how this 25 square meter kite in action on the airfield would fly 70 to 90 kilometers per hour,” he said. Seeing the force being generated was for him “an amazing experience.” He was convinced then as now that kite technology can make a difference in renewable energy.Wind turbines are not an entirely stable path, whereas intermittent power is not a problem with kites: the higher you go, the more constantly the wind blows. Added advantages to kites are that they cause less environmental impact and with lower costs.A 25 square meter sail can produce enough energy to cover the needs of 40 households, he said, in a report this week in The Guardian. The technology involves the device tethered to a generator unit on the ground. The key in getting it all to work is the automatic control and synchronization of the drum/generator module and the flight dynamics of the kite. There is a traction and a retraction phase, a reel-out and reel-in of the tether. Once the cable has completely unwound it is reeled in again. “We rotate the kite into the wind as we pull it back, so essentially the airstream does part of the work for us,” he added. They need less energy to reel in the cable.last_img read more

6 Enjoy free kids entertainment Ok so the famous

first_img6. Enjoy free kids entertainmentOk, so the famous brace of cafés on Piazza San Marco charge a small fortune for an espresso and the meagrest morsel, but there’s an upside. At night, live music flows from their doors and out on the streets, which (along with the infamous pigeons) is enough to keep the little darlings entertained while you enjoy your meal. Another tip: order a bottle of wine rather than a coffee, you’re paying a steep cover charge anyway so you might as well and the cheapest bottle at Caffé Florian is €24.50. 3. Take a tourVenice can be a bewildering city for a first timer, especially if you’ve got kids in tow. A guided tour is a great way to get acquainted, but choose carefully as you don’t want to end up in a massive group. The Roman Guy specialise in small group tours. Their ‘Venice Discovery’ tour lasts for three hours and includes a private boat trip on the Grand Canal, as well as a walking tour. If your wee ones love boats, then there’s also a visit to one of the last gondola workshops on the itinerary. You might think that, unless your kids have a penchant for Renaissance churches or a passion for classical art, Venice is not the child-friendly city break you’re looking for.But delve beyond the grandeur and Venice can become a giant water park, a playground packed with ice cream and pizza – what kid wouldn’t love that? Venice needn’t be just for adults: check out these nine top tips for enjoying a visit with the kids.1. Make an entranceBlow your children’s minds and swap the dull taxi or bus trip from Venice Marco Polo Airport for a public water bus ride into central Venice. The Alilaguna transfer is much cheaper than a private water taxi and you get the same epic approach with multiple drop off points. 7. Take a traghetto not a gondolaA gondola trip can take a sizeable chunk out of your holiday budget and the kids will probably get bored halfway through. There are still a few of the traghetti left, the dirt cheap gondolas that crisscross the Grand Canal at various points between Santa Lucia and San Marco. Note: you’re expected to stand for the duration of your journey just like the locals, although they tend to go a bit easier on younger passengers. Related8 things to do in Venice on a budgetFrom exploring the famous canals to hitting the beach; find out how to visit Venice and not spend a fortune.Top 8 Budget Places to Eat in VeniceVenice may never be a truly budget destination, even with the great exchange rates at the moment, but we’ve uncovered eight savvy eating options that offer value for money in the Divine Republic. With an ever changing army of tourists who rarely dine in the same place twice and locals…5 flights for under £50With flights to Europe from as little as £35, where are you going next? 8. Grab a gelatoWhat kid doesn’t like ice cream, apart from maybe the lactose intolerant kind? But even then they’ve got the silkiest sorbet to enjoy. So grab an ice cold treat to beat Italian heat, but avoid the shoddy gelato around San Marco and the Rialto. For the real stuff, a great view of the Giudecca Canal and some cooling breezes head to Gelateria Nico. The staff have always got a smile for the kids and the cold stuff is spot on.center_img 9. Hit the beachYou could easily leave Venice without knowing the city has a beach, a pretty big one too! Hop on a _vaporetto _out to Venice Lido to enjoy a dip in the Adriatic Sea, although be prepared to shell out a lot of euros if you want a sun lounger and some shade. Savvy locals catch a vaporetto to Sant’Erasmo, a quiet island with its own little beach and a laidback family friendly vibe.Read more: 10 beautiful secret beaches in EuropeWant more ideas for an Italian getaway? Read these articles:5 most romantic cities in ItalyLooking for holiday romance, or someone where to take your other half? Fall in love with these Italian cities.Italy’s secret cities: 5 off-track townsThink you’ve done Italy? Try one of these alternative destinations.Find flights to VeniceHotels in VeniceSkyscanner is the world’s travel search engine, helping your money go further on flights, hotels and car hire.ReturnOne wayMulti-cityFromAdd nearby airports ToAdd nearby airportsDepart14/08/2019Return21/08/2019Cabin Class & Travellers1 adult, EconomyDirect flights onlySearch flights Map 4. Get value for money on the vaporettiVenice’s famous water buses (the vaporetti) are a great way to get around, but they’re not cheap at €7 a single trip. Save some cash with a one day (€20) two day (€30) three day (€40) or seven day (€60) ACTV pass. Passes can be booked in advance and having one means you never have to join those epic queues. Even more good news for families; children under six years old travel free. 2. Keep a close eye canalsideVenice is a city built on water, hence its nicknames, ‘the Floating City’ of ‘the City of Canals’. This means that, while a fall off the pavement in Rome or Florence could cause a scraped knee, a slip in Venice and you could be leaping into a canal after them! Reins or a baby backpack are handy, as pushchairs can become a bind with hundreds of bridges and countless steps, not to mention the crowds.Read more: 10 best things to do in Venice 5. Find family-friendly restaurantsVenetian restaurants have a bit of a reputation when it comes to surly service, speeding as many tourists through their meal as possible. Head away from the main Santa Lucia to Rialto San Marco drag and things improve. Pizzerias are a great family option; Pizzeria all’ Anfora and Pizzeria Ai Bari are two superb child-friendly, cheap pizzerias south of the Grand Canal, with the former sporting a shady garden.Read more: A taste of Italy – 5 regional food specialitieslast_img read more