ResoSOL: Réseau sol(ID)aire des énergies ! ENERGIES RENOUVELABLES
sol(ID)aires
LE FUTUR DE l'EOLIEN
Tours en "composite" pour éoliennes
    Une information à caractère commercial mais qui montre que pour concurrencer les autres types d'énergie, le prix de l'éolien peut être réduit en diminuant le coût des mâts (surtout pour des turbines de 5 MW...). On pourrait discuter de l'esthétique... (Une autre voie est de diminuer les efforts en "flexibilisant" les pales.)

Giant PYRAmatrix Composite Turbine Towers Cuts Electricity Costs
Wind Energy Replaces Coal Using New Stronger Than Steel Technology;

7/9/2002
    SALT LAKE CITY, Jul 9, 2002 /PRNewswire via COMTEX/ -- PYRAmatrix Structures, Inc. announced receipt of a Department of Energy grant to develop taller and lighter weight wind turbine towers for lower cost electricity generation.
    "PYRAmatrix composite towers are 53% less expensive than steel towers thus reducing the cost of energy up to 20%. This dramatic savings makes the cost of wind energy equal, for the first time, to environmentally dirty non-renewable coal power," said Tracy Livingston, PYRAmatrix CTO. "PYRAmatrix's vastly lighter weight and ease of modular transport and assembly provides cost savings in manufacturing and erecting 1.5 to 5 megawatt (MW) turbine towers."
    Larger capacity turbines approaching 5 MW are needed for greater power production. Steel towers supporting such large units weigh over 1,000,000 pounds. Too large and costly for land transport, these massive towers are thus limited to offshore ocean locations. In contrast, a modular PYRAmatrix tower weighing only 40,000 pounds is easier and more economical to transport and assemble thus allowing land installation near cities where power is needed most.
    Breakthrough PYRAmatrix incorporates the inherent strength of both composites and pyramids. By weaving composite material into lattices of reinforcing pyramids, PYRAmatrix towers are 76% lighter than aluminum, 96% lighter than steel and 25 times stronger than steel. For example, a 47 foot PYRAmatrix tube 18 inches in diameter and weighing just 23 pounds supports almost 8,000 pounds or 350 times its weight. To support the same weight, a steel tube of the same dimensions weighs 1,875 pounds and supports only 4.3 times its weight.
    For enhanced appearance and functionality, towers may be sheathed to provide the tubular appearance of steel. Cold climates may also dictate sheathing to protect technicians climbing inside these 20 stories tall structures.
    PYRAmatrix's design flexibility allows manufacture in virtually any combination of off-the-shelf carbon fibers (including extremely high temperature tolerance fibers), fiberglass, and resin materials. Product sizes range from 3 inches to beyond 20 feet in diameter and in lengths over 300 feet. Cross-sectional configurations include round, oval, tapered, or box beam.
    PYRAmatrix Structures, Inc. has identified additional promising applications where lighter-weight strength is critical including: electric utility transmission towers and distribution poles, radar towers, cell phone/communication towers, construction tilt wall braces, aviation, aerospace, and deep water off shore drilling.
    For further information, please contact Christopher Derrington, CEO of PYRAmatrix Structures, Inc., +1-801-263-4039, chris@pyramatrix.com.
Pour info :
This 47-foot long PYRAmatrix tube weighs just 23 pounds and supports almost 8,000 pounds. To support the same weight, a steel cylinder of the same dimensions would weigh 1,875 pounds. PYRAmatrix is the world's first advanced composite structure configured in a lattice geometry for superior strength. This makes PYRAmatrix the lightest, strongest, most efficient structure available ... 91% lighter than steel and 76% lighter than aluminum. (PRNewsFoto)