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Shell Shaped Windmills
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crofter



Joined: 11 Feb 2007
Posts: 2252

PostPosted: Tue Dec 29, 15 11:12 am    Post subject:  Reply with quote    

Hairyloon wrote:
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.


I suppose it can generate *some* power at low windspeeds because it is more efficient than a conventional propeller type turbine. From the graph on the link which Nick posted, for March 2nd 2014, average wind velocity for the day was 2.74m/s & average power 58Wh so "not so sufficient" seems a good enough translation to me!

RichardW



Joined: 24 Aug 2006
Posts: 8432
Location: Llyn Peninsular North Wales
PostPosted: Tue Dec 29, 15 4:46 pm    Post subject: Reply with quote    

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


Even the biggest ones struggle to get to 80% of Betz limit.

RichardW



Joined: 24 Aug 2006
Posts: 8432
Location: Llyn Peninsular North Wales
PostPosted: Tue Dec 29, 15 4:52 pm    Post subject: Reply with quote    

crofter wrote:
From the graph on the link which Nick posted, for March 2nd 2014, average wind velocity for the day was 2.74m/s & average power 58Wh so "not so sufficient" seems a good enough translation to me!



Do you mean 58Wh total generation or that it averaged 58watts for each of the 24 hours it was metered? IE 1.392kWh or 1392Wh.

If the former then its controller prob used more than that over the 24 hours.

If the latter then that is a good production for a 2.74m/s wind speed. Most dont make any power at that speed.

Thats the problem with averages. There could have been no wind all day apart from one hour that pushed the turbine to the limit of its production.

dpack



Joined: 02 Jul 2005
Posts: 34724
Location: yes
PostPosted: Thu Dec 31, 15 7:49 pm    Post subject: Reply with quote    

a bit of an aside but a waterwheel of an appropriate sort and some gears and tings are very reliable

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