Archive for Downsizer For an ethical approach to consumption
 


       Downsizer Forum Index -> Energy Efficiency and Construction/Major Projects
Hairyloon

Shell Shaped Windmills

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

tidy Cool

propeller types are not ideal
RichardW

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

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

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

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

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

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

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

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. Smile
Treacodactyl

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. Smile


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

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

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

i wonder if a wet version would work in moving water Hairyloon

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.
crofter

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

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

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

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

a bit of an aside but a waterwheel of an appropriate sort and some gears and tings are very reliable
       Downsizer Forum Index -> Energy Efficiency and Construction/Major Projects
Page 1 of 1
Home Home Home Home Home