Eolien : l’avenir se joue en altitude L’un des principaux défauts des éoliennes classiques est leur difficulté à exploiter le vent de manière efficace. Ce dernier est instable à proximité de la terre et relativement peu puissant. Depuis des années, les éoliennes sont de plus en plus grandes afin d’être plus efficaces mais les structures atteignent peu à peu leurs limites. L’idée d’ingénieurs est donc d’aller chercher le vent là où il est potentiellement le plus exploitable : à 400 m d’altitude voire jusqu’à 1.000 m pour certains prototypes. A cette hauteur, le vent souffle à une vitesse comprise entre 100 et 350 km/h et de manière constante. Des premiers prototypes encourageants Concrètement les projets ne sont qu’à leurs débuts. Le deuxième prototype ressemble d’avantage à un ballon géant gonflé à l’hélium et muni d’une turbine. Une énergie disponible partout et moins cher Les avantages des éoliennes volantes sont nombreux. Des risques limités Très vite se posent des questions de sécurité. Arnaud Martin
aquaponics Aquaculture is the symbiotic cultivation of plants and aquatic animals in a re-circulating system. Growing Power uses Tilapia and Yellow Perch to fertilize a variety of crops and herbs using aquaponics. Aquaponics is the method of growing crops and fish together in a re-circulating system. In the Growing Power aquaponics model crops grow vertically on raised beds. Types of fish we grow: Yellow Perch Yellow Perch is a species of perch found in the United States and Canada and is a glacial lakes species. Yellow Perch are also in short supply. What does Perch eat? Tilapia Originally found in Africa, Tilapia has been farmed for more than 2,500 years. What does Tilapia eat? Why do we use compost in our system? We fill our growing pots with a mixture of coir and compost. Interested in learning more?
Google X Acquires Makani Power And Its Airborne Wind Turbines After previously investing in the company, Google has now acquired Makani Power, a green energy startup that is currently building airborne wind turbines. The acquisition was first reported in Brad Stone’s Businessweek story about Google X, and judging from Stone’s story, the team will join Google X. Google invested $10 million in the Alameda, Calif.-based company in 2006 and another $5 million in 2008. As far as we can see, this also marks the first time Google has acquired a company specifically for its Google X skunkworks. Stone reports that Google CEO Larry Page approved the acquisition, but as Google X’s director Astro Teller notes, Page said that X “could have the budget and the people to go do this, but that we had to make sure to crash at least five of the devices in the near future.” The company was founded by Saul Griffith and Don Montague, a former World Cup windsurfer. Here is how TechCrunch columnist Matylda Czarnecka described the project back in 2012:
Google's Makani: From Regulatory To Technical To Wildlife Challenges Clean Power Published on February 19th, 2014 | by Mike Barnard Almost a year ago, Google took a 100% ownership position in Makani, an airborne wind energy company. It had previously held a $15 million position in the company, but after the tragic death of one of its founders, Makani’s future was less certain. Now it has deep pockets in Google X, the division devoted to breakthrough technologies. So, how likely is Makani to disrupt wind generation? Makani’s 20 KW (average output when flying under optimal conditions) working prototype. Close assessment of Makani’s public documentation shows that their approach to airborne wind energy has several serious challenges, some in common with other airborne wind energy approaches, some unique to Makani: It is unlikely that they will be able to put up more than a handful of onshore wind farms given the restrictions, but offshore in tropical and subtropical climates is somewhat more promising. What is the Makani model? But it gets worse for Makani.
Home Energy - KiteGen: A revolution in wind energy generation Volume 34, Issue 3, March 2009, Pages 355–361 6th World Energy System Conference Edited By Gianfranco Chicco and Puica Nitu Advances in Energy Studies 5th workshop on Advances, Innovation and Visions in Energy and Energy-related Environmental and Socio-Economic Issues Edited By Sergio Ulgiati and Mark Brown Abstract Control of tethered airfoils is investigated, in order to devise a new class of wind generators to overcome the main limitations of the present wind technology, based on wind mills. Keywords Emerging control applications; Power systems; Wind energy Copyright © 2008 Elsevier Ltd.
ARCHIVED - CBD-28. Wind on Buildings - IRC - NRC-CNRC Information found on this page has been archived and is for reference, research or recordkeeping purposes. Please visit NRC's new site for the most recent information. Archived Content Information identified as archived on the Web is for reference, research or recordkeeping purposes. It has not been altered or updated after the date of archiving. Web pages that are archived on the Web are not subject to the Government of Canada Web Standards. Please note This publication is a part of a discontinued series and is archived here as an historical reference. Originally published April 1962. W. In the past very simple concepts have frequently been used in estimating live loads for structural design. Wind loads have become particularly significant because of the increasing number of high-rise buildings. Some tall buildings that extend into regions of high wind velocity have swayed excessively in strong winds. Development of Wind Velocity Profile Figure 1. Turbulence in Surface Winds Figure 2. * D.
DIY Underground Greenhouse | Harvesting Your Own Safe, Fresh, Vegetables – Year Round The Benson Institute in Provo, Utah is a nonprofit organization established in 1975 as a division of the College of Biology and Agriculture at Brigham Young University (BYU). Named in honor of Ezra Taft Benson, the U.S. Their Mission: To improve the quality of life of the people of the Earth through improved practices in agriculture and nutrition. Over the past three decades the Benson Institute has developed unique programs teaching village farm families and others in the developing world how to become nutritionally self-sufficient and to greatly improve their economic circumstances. The ripple effect of these programs benefit all citizens of Earth. For instance the Walipini underground greenhouse, first developed more than 20 years ago and deployed in South and Central America. Want to learn how to build your own? And with the never ending recalls of tainted food products, this kind of knowledge is just what we need.