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Shell Shaped Windmills
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Hairyloon



Joined: 20 Nov 2008
Posts: 15215
Location: Today I are mostly being in Yorkshire.
PostPosted: Sat Dec 26, 15 6:07 pm    Post subject: Shell Shaped Windmills  Reply with quote    

Quote:
A super-efficient and completely soundless wind turbine developed by a Dutch company aims to enable every household to generate its own wind energy.

Officially unveiled today, the shell-shaped Liam F1 Urban Wind Turbine offers much better efficiency compared with conventional designs. Its shape, modelled after the perfectly logarithmic spiral of a Nautilus shell, allows the turbine to always position itself at the best angle towards the direction of the wind, achieving efficiency which is about 80 per cent of what is theoretically possible.


http://eandt.theiet.org/news/2014/may/wind-turbine-Liam-urban.cfm

dpack



Joined: 02 Jul 2005
Posts: 35011
Location: yes
PostPosted: Sun Dec 27, 15 5:38 pm    Post subject: Reply with quote    

tidy

propeller types are not ideal

RichardW



Joined: 24 Aug 2006
Posts: 8432
Location: Llyn Peninsular North Wales
PostPosted: Sun Dec 27, 15 9:24 pm    Post subject: Reply with quote    

The urban environment is not suitable for turbines.

Its is too turbulent until you get so high you wont get permission.

Dont confuse turbulence with changes of wind direction.

vegplot



Joined: 19 Apr 2007
Posts: 21298
Location: Ynys Môn
PostPosted: Sun Dec 27, 15 9:26 pm    Post subject: Reply with quote    

An interesting design, which may not be susceptible to turbulence in the same way as bladed turbines are. Testing will tell.

Mistress Rose



Joined: 21 Jul 2011
Posts: 10467

PostPosted: Mon Dec 28, 15 10:01 am    Post subject: Reply with quote    

Looks interesting, and if it can cope with turbulence it may take wind generated power forward a long way.

RichardW



Joined: 24 Aug 2006
Posts: 8432
Location: Llyn Peninsular North Wales
PostPosted: Mon Dec 28, 15 2:22 pm    Post subject: Reply with quote    

Remember the roof mounted turbine that B&Q were selling?

They too promised to work on a roof in an urban area.

Ended up using more energy than they made.

crofter



Joined: 11 Feb 2007
Posts: 2252

PostPosted: Mon Dec 28, 15 4:40 pm    Post subject: Reply with quote    

It is difficult to judge the scale of the photo, but would be interesting to know what size they are. 1.5kw is a useful contribution.

Nick



Joined: 02 Nov 2004
Posts: 33978
Location: Hereford
PostPosted: Mon Dec 28, 15 4:47 pm    Post subject: Reply with quote    

1.5m diameter.

http://dearchimedes.com/pdf/PP_022_final.pdf data comes from this poster.

The original link is eighteen months old. I assume they work, or don't, by now.

crofter



Joined: 11 Feb 2007
Posts: 2252

PostPosted: Mon Dec 28, 15 5:47 pm    Post subject: Reply with quote    

Thanks Nick.

From that same link

Quote:
1.Under 2 m/s condition, even though the generating electric power may be not so sufficient, this Archimedes
spiral wind turbine can produce the electric power


It would be useful to have a figure for the "not so sufficient" power.

found this:

Quote:
at 15 m/s results in 1500W
costs about 3500 euros


15m/s is force 7 (near gale)

Nick



Joined: 02 Nov 2004
Posts: 33978
Location: Hereford
PostPosted: Mon Dec 28, 15 6:20 pm    Post subject: Reply with quote    

If you track back to the home page, there's a ton of links. Might be stuff in there. Clearly, it's manufacturer data which, while often accurate, is almost always an incomplete, biased picture. However, it's there.

Treacodactyl
Downsizer Moderator


Joined: 28 Oct 2004
Posts: 25697
Location: Jumping on the bandwagon of opportunism
PostPosted: Mon Dec 28, 15 6:29 pm    Post subject: Reply with quote    

Nick wrote:
If you track back to the home page, there's a ton of links. Might be stuff in there. Clearly, it's manufacturer data which, while often accurate, is almost always an incomplete, biased picture. However, it's there.


There's a rather skeptical blog post about the claims. I had a bit of a google when HL first posted up the link but couldn't find out much meaningful info apart from the various articles from 2014 that seem to refer to the same press release.

The link in HL's post seems to contains a bit of 'spin', but I like the idea and all the small wind turbines I've seen have been rather noisy and not having something looking like a common wind turbine would be useful.

RichardW



Joined: 24 Aug 2006
Posts: 8432
Location: Llyn Peninsular North Wales
PostPosted: Mon Dec 28, 15 10:18 pm    Post subject: Reply with quote    

crofter wrote:
It is difficult to judge the scale of the photo, but would be interesting to know what size they are. 1.5kw is a useful contribution.


A normal turbine would need to be about 3 to 4m across.

You can only extract X% of the energy out of the wind or the air flow will stall. Then you have to take into account the Betz limit which reduces further the amount converted to elec.

crofter



Joined: 11 Feb 2007
Posts: 2252

PostPosted: Mon Dec 28, 15 11:51 pm    Post subject: Reply with quote    

They claim 80% of Betz' limit on the original link

dpack



Joined: 02 Jul 2005
Posts: 35011
Location: yes
PostPosted: Tue Dec 29, 15 1:26 am    Post subject: Reply with quote    

i wonder if a wet version would work in moving water

Hairyloon



Joined: 20 Nov 2008
Posts: 15215
Location: Today I are mostly being in Yorkshire.
PostPosted: Tue Dec 29, 15 9:28 am    Post subject: Reply with quote    

crofter wrote:
Quote:
1.Under 2 m/s condition, even though the generating electric power may be not so sufficient, this Archimedes
spiral wind turbine can produce the electric power


It would be useful to have a figure for the "not so sufficient" power.

I had read that to be badly translated.

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