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crofter

Joined: 11 Feb 2007
Posts: 2252

Posted: Tue Dec 29, 15 11:12 am Post subject:

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: 8443
Location: Llyn Peninsular North Wales

Posted: Tue Dec 29, 15 4:46 pm Post subject:

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: 8443
Location: Llyn Peninsular North Wales

Posted: Tue Dec 29, 15 4:52 pm Post subject:

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: 46323
Location: yes

Posted: Thu Dec 31, 15 7:49 pm Post subject:
a bit of an aside but a waterwheel of an appropriate sort and some gears and tings are very reliable

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