camelot-forum.co.uk

https://www.surfertoday.com/environment ... nd-turbine

No "spinnin blades-o-doom".. I like the look of this, the simple material / assembly & the potential for micro turbines that may actually deliver, would be keen to short mount one & see what it can catch. & trickle charge over our windiest fen months.

I’d dearly love it to work.

But just like the hundreds of designs that came before it, it won’t.

Stinsy wrote: ↑Mon Dec 05, 2022 6:18 am I’d dearly love it to work.

But just like the hundreds of designs that came before it, it won’t.

New to wind turbines, why do you think it will not work?

It is more BS. 1500kW per year at 5m/s? Even if the largest one quoted (1.5m ) extracted 100% of the energy from the wind 24 hours a day, 365 days of the year at 5m/s it would only get to just under 1200kWh in the year. They are quoting that for the smaller "domestic" one which if it extracted 100% would generate under 0.3kWh per annum.
On a good site they may just do 50% of that figure but sat on top of a roof in turbulent air ??????? No chance.

Do the math, no more chance of working than the mad idea of VAWT around lamp posts by the road.

If you see any "new" design for a wind generating device do a quick calculation to check their numbers.

Energy in the wind, i.e. the maximum that can be generated is given by the formula. P =1/2*p*A*V³

Where P is power in Watts
p is density of air. 1.23kg/m³
A is swept area of the blades or screw or whatever
V is wind speed. (cubed)

NikoV6 wrote: ↑Mon Dec 05, 2022 7:58 am

Stinsy wrote: ↑Mon Dec 05, 2022 6:18 am I’d dearly love it to work.

But just like the hundreds of designs that came before it, it won’t.

New to wind turbines, why do you think it will not work?

See my post above on how to calculate how much "power" there is in the wind.

Wind turbines/generators need to be in clear air, free from turbulence. It has been proven time and again that mounting one on the roof of a house, or any building, just does not work. Too much turbulence caused by the wind hitting the roof. The attached pic shows the flow over a nice clean building (different angles of roof) - remember in these pics the wind is constant from one direction, just imaging the turbulent chaos around a roof mounted turbine in real world conditions when the wind hits the gable end or comes from any other angle. The pics also show why most roof tiles "lost" in high winds are actually "sucked" off the roof due to the lower pressure on the downwind side!





I ran a very good small wind turbine for around 6 years. Had 1.8m diameter blades, rated at 1kW out put. It was mounted on a 9m high pole well away from any buildings or other obstructions. We are in a windy area right by the channel coast. In its best year it generated 1100kWh. It regularly peaked at 1.5kW in 40MPH winds but only for very short periods.

NikoV6 wrote: ↑Mon Dec 05, 2022 7:58 am

Stinsy wrote: ↑Mon Dec 05, 2022 6:18 am I’d dearly love it to work.

But just like the hundreds of designs that came before it, it won’t.

New to wind turbines, why do you think it will not work?

There have been literally hundreds of "chocolate teapot" micro wind turbines marketed and none of them deliver any significant power. Wouldn't it be great if you could strap something onto your house that delivered a few hundred Watts every time the wind was blowing? Particularly as the wind blows at night and in winter when solar isn't producing. Unfortunately the physics simply isn't there. For a wind turbine to work it needs to be in "lamina flow" windstreams, this requires the turbine to be very tall and very far from trees/buildings. If you have a decent patch of land and live in a suitable part of Scotland or The Fens then you could indeed power your house with a wind turbine. But it won't be one strapped to your house.

The same as those solar panels for charging your phone. To generate the 10-20W required to charge a phone you need a panel A4-A3 sized, that is perfectly orientated in bright sunshine. If a panel is only just bigger than a phone, not perfectly oriented, or it is cloudy, that panel won't do shit (You can buy a battery that'll power your phone for a week for less than £20).

There is other stuff too that cannot possibly work due to limitations of the universe, but seems to come up time and again. I'm pretty sure many of them are scams designed to relieve investors of their hard-earned...

Stinsy wrote: ↑Mon Dec 05, 2022 8:59 am There is other stuff too that cannot possibly work due to limitations of the universe, but seems to come up time and again. I'm pretty sure many of them are scams designed to relieve investors of their hard-earned...

I am certain that most if not ALL are scams designed to relieve "investors" of their cash. A problem that could be easily solved if people would do a tiny bit of research, a few fag packet calculations or ask a few questions of the right people before parting with their money.

Compressed air powered cars are another perennial "idea". Many have been promised but again they come up against those pesky laws of physics

Maybe not as scientific as Marshman’s posts, but we installed a weather vane in the lee of the house, on the garage - it’s just at house roof soffit height, about 10m from the house.

Detached house in the middle of a relatively large plot on top of a valley side, you would think pretty clean air. Prevailing wind SW, house faces S.

The weather vane is remarkable to watch - when the clouds are scudding across in a single direction, the weather vane is often hunting to find the wind direction, sometimes ending up totally opposite to the cloud direction.

Sure this indicates the turbulence caused by the house/roof.

Another, is watching how leaves gather in places you think the wind wouldn’t get - again, probably caused by eddies and turbulence in the wind flow.

Complex

Even less scientific from me,

When you have been on a renewable forum for about 10 years you will have witnessed more than enough evidence to know that these things are all a scam.

There was a great video a while back, I'll try and find it but it might have been in the other place. The video was made by some wind turbine engineers and talks about the physics and shows designs going back decades that simply don't work and show that dodgy people copy old designs that don't work and present them to investors as the next great breakthrough.

Maybeeee I should get involved in Turnip Design.

Many years ago I installed a weather vane with a Pussy Cat on one end chasing a small mouse on the other end.
The Pussy cat being bigger than the mouse means the mouse points into the wind. Lots of people have commented about it over the years.
Quite a few did not notice the North / East / South / West display indicators were welded in Random positions on the vane.
If any one wants to send Money by post. I can get involved in Turnip Design.