Dutch company launches new-generation urban wind turbines

Dutch company launches new-generation urban wind turbines

Could a new generation of wind turbines on residential rooftops be on the way? Saying no might be easy when imagining blade noise, if nothing else. The idea of wind turbines for generating energy in households may draw several arguments against the idea. One may argue the yield from current-generation turbines would be too low, along with having to put up with the noisy blades. A group based in Rotterdam which describes itself as an "R&D" company "built on the re-invented formulas, drawings and principles of Archimedes" is out to change minds. On Tuesday, the company, also called The Archimedes, unveiled its Liam F1 Urban Wind Turbine. The Liam, according to the company, ushers in a "totally new generation of wind turbines for domestic use."

The company said that the turbine easily fits on the roof of a house just as would solar panels. The Liam F1 generates an average of 1,500 kilowatt-hour of at a wind-speed of 5m/s, which resembles half of the power consumption of a common household. In combination with solar-panels on the roof, a household could be totally self-supporting for its own energy needs. The Archimedes CEO Richard Ruijtenbeek said, "when there is wind you use the energy produced by the wind turbine; when the sun is shining you use the solar cells to produce the energy."

Because of its design, the Liam addresses limitations of efficiency and noise. The inventor, Marinus Mieremet, company CTO, created a type of turbine that is virtually soundless. The Liam is based on "the laws of nature and the theoretics of the Greek mathematician Archimedes." The form of the Liam is a Nautilus shell. The Liam automatically like a pennant goes for the optimal position of the wind, pointing into the wind for maximum yield. According to Mieremet the yield is 80 percent of the maximum that is theoretically feasible.

Explaining the design, according to the company, "Most today's require that a difference in pressure between the front and the rear side of the rotor blades be maintained in order to be effective. However, this difference in pressure also has a negative effect called 'drag'. Our turbine rotor captures the kinetic energy of the wind due to its speed, and, by reversing the wind and reducing it to almost zero Beaufort converts it into mechanical energy. By doing this the wind speed's effect (in kinetic energy) on the rotor is maximized and 'lift' is obtained by the wind's acceleration over the rotor plane."

The Archimedes started in 2006, founded by Mieremet and Ruijtenbeek. The announcement on Tuesday also noted that the company has started developing relatively small turbines for use on boats, on lampposts and in water.

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More information: The Archimedes: dearchimedes.com/

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May 28, 2014
This is an excellent idea to tap into the urban wind generation market and the rotor design seems smart. I suppose they can get some sales in using the pole mounted system but they need to start planning for average rooftop installation. Also it would be interesting to see if they can scale up the system with having multiple units in a small area.

May 28, 2014
Windmill 2.0

I've seen a demonstration, though I live in a predominantly windy (and rainy ⌐⌐ ) country, I'm doubting the 5Kw/h output...it's quite a lot for such a small device.

May 28, 2014
Yo, Perception, ya buy one, got skin-in-the-game, or just another tout? Where's Don Quixote and his modern squire Sancho PONZI when we need him? The dragon Ignorance will never be defeated, and as entropy will swallow the Universe.

I guess I do have skin-in-the-game as you put it as I've got designs on paper for urban wind power generation of my own and I see the potential of this product. The UK doesn't get much sun as you know but yes I think we could put the wind to work.

May 28, 2014
Anybody else remember the similar "windmill on a stick" toy?

May 28, 2014
'...1,500 kilowatt-hour of energy at a wind-speed of 5m/s'

Agreed, it does seem like a typo on the energy figure.
1.5kWhr at 5m/s seems more plausible than 1.5MWhr.

For comparison the Bonus 1.3MW Combistall machine (http://www.wind-e...3-mw62/) needs a 62m blade diameter to produce that amount of power and won't start doing it till the wind hits 15m/s.

May 28, 2014
This embodies a standard deceptive practice for wind turbines -- trumpeting performance at unusual wind speeds. In Boston, direct rooftop measurement on a large building with clear space all around shows an average of around 3 m/s (even though the wind map suggests something a lot higher). If their turbine provides half of household energy needs at 5 m/s, then at 3 m/s the expected energy is (3/5)^3 of that, less than 1/8 of household needs. And it might not even 'cut in' at 3 m/s.

When my students and I looked at providing more than half of a home's needs with an average windspeed of 3 m/s, we needed a rotor diameter of 27 ft. If these innovators want to provide the energy for a home, they need a size approaching that, because of the general principle that the power/area of a given wind speed must be captured by a large enough area.

May 28, 2014
The Liam F1 generates an average of 1,500 kilowatt-hour of energy at a wind-speed of 5m/s, which resembles half of the power consumption of a common household.

In what? A week, a month, a year?

Wind follows roughly a Rayleigh distribution when free of obstructions, so the average windspeed on a given day or similiar short interval, when the long term average is 5 m/s, is 50% likely to be less than about 4.3 m/s.

Wind speeds of less than 4.3 m/s represent on average 3% of the total available power from 0 to 12 m/s where the windmills typically furl out to protect themselves, so on your typical day, you have about half the chance of getting "nothing", and the probability of getting a whole week of these lulls is about 1/128 which means it should happen about three times a year.

So better stock up on batteries.

May 28, 2014
Correction: the probability of going a week with less than 4.3 m/s is 0.4 in a year, not three times a year. Forgot that there isn't but 52 weeks in a year to start with.

However, the probability of going 5 days in a row without appreciable power from the windmill is 1:32 or 2.28 times a year.

Of course this is no problem if you intend to outsource your power balancing to the nearest coal burning facility.

May 28, 2014
The design supports high efficiency at low air-speeds, but it looks vulnerable to a gale (25+ m/s). It will need to be carefully balanced. It looks more to me like a DaVinci Airscrew rather than a device of Archimedes' design.

May 28, 2014
Looks like it should be doing something more exotic than just spinning in the wind, like emitting n rays or something. Steampunk microflux phlogiston engine.

May 28, 2014
I've lived with several designs of windmills, and this one is a con. Power (in KW, not kwh) is dependent on windspeed, and area swept. This design is too small, non-furling (power generated is the cube of windspeed) and expensive to make.

May 29, 2014
As Eikka noted,
"...The Liam F1 generates an average of 1,500 kilowatt-hour of energy at a wind-speed of 5m/s, which resembles half of the power consumption of a common household..."
...is meaningless since it does not give any reference to the time at that windspeed required to generate 1500 kwhr.

May 30, 2014
There's the problem with using a comma in place of a period. The turbine puts out 1.5 kw of energy at 5 m/s, not 1,500 kws.
These look quite suitable to include in a solar-optimal Net-Zero Energy or Passive House of the kind I would like to build next. I should be able to get it- the house- to run off less than 2 kws. (I've seen some that run off a 300 watt solar panel...

The spiral turbine will likely be less of a disturbance to the goats and chickens up on the living roof.... :-)

May 30, 2014
Essentially ornamental.

May 31, 2014
Power: The spec sheet on the company web site says 508 Watts in 10 m/sec wind, and tops out at 1.5 kW at 15 m/s wind.

Energy: Energy is power times time, so clearly either the 1500 kWh should be kW, or a time period is missing. Let's figure out which:

From the spec sheets in a 5 m/s wind it should produce ~125W, which is four orders of magnitude less than 1500 kW (and 12x less even than 1500 W), so it looks like a time period is missing.

At 5 m/s it would take 1.5 kWh/.125 kW = 12,000 hours to generate 1.5 kWh, or a bit over a year.

However at an AVERAGE wind speed of 5 m/s the energy would be a bit higher because the gain in higher wind exceeds the reduction in lower wind. The yearly total should be a bit higher than 24 Hours/day * 365 days/year * 0.125 kW = 1095 kWh/year.

So the average of 1500 kWh at 5 m/s wind is probably a corruption of 1500 kWh PER YEAR in a location where the wind AVERAGES 5 m/s.

May 31, 2014
Power: The spec sheet on the company web site says 508 Watts in 10 m/sec wind, and tops out at 1.5 kW at 15 m/s wind.

Thanks for finding the spec sheet. A rule of thumb estimate is that power is proportional to the cube of wind speed. So given the 10 m/s power, in a 5 m/s wind power should be 508/(2^3) = 64 W

This is not going to put much dent in a household's power budget. (And the situation is even bleaker if wind speed is 3.33 m/s, expect about 20 W.)

Now look at the problem financially: a yearly energy budget of 4000 kWh costs about $800. If you make about 1/8 of your needs with a wind turbine, you are saving $100 per year. If the turbine costs any more than $1000 to purchase and mount, it will probably wear out before it pays itself back.

My students designed a 30-ft diameter turbine to sell for $3000 and pay itself back in about 5 years, when average wind speed is 3 m/s. But to survive high wind speeds it has to auto-furl.

May 31, 2014
7000 various sizes sold in 14 countries and counting. Wow. Really impressive guys. For a new device. Just wonderful.


Jun 01, 2014
I don't think the average roof could support this thing .One big enough to generate enough power to significantly reduce it's owner's electric bill would be too heavy to be safely supported on a typical home. In that case,you would be looking at an expensive tower.

Jun 01, 2014
@bikengr - the power does indeed go with the cube of the wind speed, which is what thought I did. But I see that I only divided by 2 twice instead of three times, so you are correct that it should be about 64 Watts at 5 m/s.

Thank you for catching my careless mistake!

Jun 02, 2014
More unquestioned hype. When is phys.org going to apply a bit of editorial skepticism, rather than simply trumpeting every press release that comes along?

Previous commenters have nailed it. It's a wee little energy harvest, no doubt with a payback period that will make even rubes choke. Add in the cost of electrical equipment required to integrate it into household current and it's a total nonstarter.

But of course advertising can sell anything. Anything at all, particularly if news media asks no hard questions.

Jun 02, 2014
Why not install it on a few buildings and see how it works out? Usingthis on a massive scale should be monitored closely, as cities have a need to exchange air. If the air flow is slowed significantly then this could lead to increased smog/particle concentrations.

Jun 02, 2014
The name of the game should be the cost of the installed device compared to the average amout of electriciity it can generate. Size and efficiency are not significant. Thus the above suggestion of the child's windmill based on a square sheet of paper (having 4 blades attaced at the center) is probably the best kind of practical solution that is based on this principle, because it can be cheaply made at the largest size to suit the tower height on which it is to be fixed. That means that this archemedial screw design is a fine looking device, very efficient and interesting to observe but it will not be able to compete in cost with the idea of a simple modified flat sheet with curved blades as envisaged from using the children's toy.

Jun 03, 2014
The unit actually produces 1500 Wh (not kWh) and at a cost of 3.999 EUR.


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