THE ADVANTAGESThe advantages of the technology with vertical wind turbines Eliwind
It’s been confirmed by extensive literature and experimental data that the vertical axis option has many advantages versus the traditional horizontal axis: higher efficiency transformation, omnidirectional, its ability to use turbulent winds etc.
The additional vertical axis superiority of ELIWIND * versus horizontal axis turbines is due to the terraced effect of Darrieus latest generation, furthermore it exploits even the most turbulent winds and swirling with sudden changes of direction, this thanks to the adoption of blades made in 3 profiles, that are attached at the highest elongation ratio that can delay the stal,l even for incidence angles of 90 °, in any case guaranteeing low induced drag and therefore allowing the wind machine to work with low lambda (lambda is also referred to as TSRs -Tip Speed ratio)
This unique shape of ELIWIND * shovel further enhances the ability of mutual interference between positive wind rotors placed in close proximity, allowing greater installation density of wind rotors on the same area as already experienced by the California Institute of Technology.
Less handling of lambda ELIWIND shovel * than the Darrieus (about TSR = 1.2 for ELIWIND * against TSR = 2.3 Darrieus) ensures excellent self starter modus even at very low wind speed rotor (eg. 1.5-2, 0m \ s) but above all the power is delivered at low rpm with high torque, in practice it halves the peripheral speed of the blades.
This considerable reduction of the peripheral speed of the blades drastically reduces the specific bending stresses induced by the centrifugal forces (1 \ 4 compared to Darrieus) allowing a more simple and linear construction of the blade (pultruded profiles at low cost), the blades are mounted on compact supports made of traditional non-profiled tubular carpentry.
The construction system of ELIWIND * is therefore much more scalable, it optimizes and reduces the costs of the process of industrial production, assembly and installation on the wind farm site.
There is also a further factor in favor of the ELIWIND solution *, it is the strong reduction of the peripheral speed with lower number of revolutions and lower specific effort, this means that the maximum number of cycles of dynamic stress (fatigue efforts) is much higher than any other wind rotor with a vertical axis of the same diameter, thus bringing the operational life of the ELIWIND * machines to more than 50 years without performing any maintenance.
In conclusion, the ELIWIND * wind rotors currently represent a cutting-edge technological solution both in terms of fluid machines and on the management and industrial production on a large scale.