HAWT%20requirements%20whitepaper%20v1. How significant is bird and bat mortality due to wind turbines? Wind turbines are often criticized for killing birds and bats.
Fights against siting wind turbines in bird migration corridors or in bird habitat are frequent. Highly inflammatory language is used by anti-wind energy advocates such as ‘bird mincer’, ‘bird blender’ and ‘eagle killers’. Outlandish numbers of deaths are often attributed to them. How significant is the mortality of wind turbines upon birds and bats?
Short Answer: Replacing all fossil fuel generation with wind turbines world wide would save tens of million birds lives annually. Long Answer: Overall, wind energy has the least impact on wildlife of any form of energy generation with the possible exception of solar. Every other form of generation has at some point in its lifecycle the possibility of: or Wind energy at worst has only the possibility of: These are the big threats. What about birds specifically? Birds are killed as a result of human impacts in large numbers every year. Here’s a Canadian specific table for perspective. .  FAAfromMakani. Are airborne wind turbines a plausible source of cheap clean energy? One of the interesting things about wind energy is that while the market has spoken loudly and clearly about what makes economic sense for wind generation, every week there’s another news story on wind generation innovations such as relatively ineffective vertical-axis wind turbines that are going to replace horizontal-axis, three-blade wind generators.
An ongoing area of enthusiasm and to date fruitless investment is the area of airborne wind generation. Numerous companies have concepts or designs which are hyped as replacing the roughly 250,000 iconic white, tri-blade towers around the world today. However, there are several fundamental challenges with airborne wind turbines related to flight hazards, safety, technical viability, economic viability, maintenance challenges and winter weather operation that will prevent them from filling any but minor niche roles for the foreseeable future. What is airborne wind energy? 1. 2. Tethers present another class of problems. Loyd1980.pdf. 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 Information found on this page has been archived and is for reference, research or recordkeeping purposes.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. 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? Courtesy Makani 600 KW target design. The technology – Makani – Google. The solution – Makani – Google. Makani – Google. 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. Un potentiel énorme donc, surtout quand on sait que les éoliennes classiques ne sont productives que 20 % du temps.
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 Des risques limités Arnaud Martin.