A new prototype wind turbine, 30 years in the making, and designed for flat-pack shipping and easy assembly, has been erected at Keele University in the UK.
Like other vertical axis turbines, the prototype, designed by McCamley, is particularly well-suited to the gusting winds of inner cities, though the company is quick to point out the design is also suitable for rural installations. The turbine is able to begin rotating during light breezes as modest as 1.8 m/s (4 mph) in speed.
McCamley says the design can be adapted to capacities between 1 and 24 kW, though larger sizes have yet to be realized. The present target is to develop a 12-kW model within the next six months. There are plans afoot to eventually scale the design to turbines of over 1 MW in capacity.
The low starting speeds mean that turbines can be mounted on building rooftops without the need of an additional mast, and McCamley claims the multi-leg design of the turbine reduces the stresses placed on the building's structure. Combined with the turbine's lightweight design, McCamley suggests the need for structure reinforcement can be reduced or negated.
Source: Keele University, McCamley
U.R.
And what do you do you do when there's no wind? Woopdedoo
The number of birds killed by windmills is greatly exaggerated by the green fascists who voodoo up numbers by at the time of highest bird population count the scavengers and dead birds invent a number of dead birds that would have been eaten if the scavengers ate nothing but windmill killed birds, and then adding actual dead birds to theoretical dead bird and take that number and extrapolate for the number of birds killed in a year without accounting for the lowered bird population for the rest of the year. The life of windmill blades is shortened by bird strikes (this includes bats as well) so to prevent loosing an entire turbine when a blade fails they have sensors that count bird strikes and the actual count is at least an order of magnitude less than the "official numbers"
The real problem with windmills is that the output is subject to constant variation and the wind doesn't always blow when convenient. I have always thought that windmills should generate highly storable energy such as compressed air or lifted water and generate the electricity on demand.
I haven't read any research about using big windmills to pump water up a hill to make hydro power when it comes down and I'm too lazy to do the maths myself. Likewise they can compress air or just lifting a heavy weight. In those cases you could recover the potential energy added at a rate that more or less equalizes the average output of the windmill thus giving a steady power output. Maybe those storage techniques are inefficient enough to not bother with?
Any other than these 2-5blde units can't be eff, cosy efective because of basic physics that works againsat Vertical WT's.
Noise on any good WT is less than wind noise and other problems have easy fixes. A good 2kw 14' dia 2kw unit can supply an eff home in many places with the power it needs for 50 yrs. YMMV.