Windpower Exchange

Comment

Comment by Allen Williston on August 25, 2010 at 12:04pm

Concerning the Hydraulic pump windmill: All manner of power conversion (from wind to mechanical to electrical) has a certain amount of inefficiency. By converting the mechanical (rotating blades) to hydraulic, transporting that hydraulic power, converting the hydraulic power to mechanical (hydraulic motor) and then to electricity adds a number of areas where you would have inefficiency losses.

However... one of the largest limitations for wind power is that it is not always available when the utility needs it. By using a large enough accumulator, electricity could be generated nearly on an as-needed basis. This could make the concept more valuable than the cost of having the additional energy losses. Further, the turbine would be allowed to operated at any time - in any wind speed condition (as far as it is safe for the turbine components) - and build up pressure in the accumulator.

This concept is one that we, too, are researching, but my current focus is on getting the first 125kW turbine built. A portion of it should be up by November.

Comment by James on August 25, 2010 at 4:23am

Hi, great article! I found some Free Open Access books and articles on this subject on this website: www.sciyo.com. Hope you'll like it

Comment by Andrew Feliks on July 31, 2010 at 5:26pm

This is hydraulic pump of widmil

Manner of utilization is next my proposal instead of mechanical transmission
in producing windmills electric current :Hallf Rotete Pump
Main principle of operation on following drawing and has enclosed animation
Solution has many advantages from haf rotate pump. Expensive
substitute is first most important and noisy, emergency transmission
of mechanical windmill .
It is presented next advantage on former drawing
for one dynamo driven manner of connection
of whole farm of windmill hydraulic engine serious too.
This way, we save several most expensive elements of windmills,
treating such farm windmill as integrity .( Complex design)

Regards Andrew

Comment by Djordje Dragojlovic on May 13, 2010 at 1:58am

This concept does seem interesting, but i can't help to wonder ...

"...One major advantage of not having blades is reduced maintenance costs. For instance, the turbines can be mounted on towers or poles, while generator equipment can be located at the tower base, eliminating the need for climbing the tower for routine maintenance..."

Woldnt you loose power due to friction and other parasite effects while transfering energy from the turbine shaft to the generator? If they ment that turbine and the generator are still on the same shaft, what about mechanical propertis of the shaft (there will be a lot of torsion)?

The power of the wind is proportional to the force produced and the wind speed, and the force is proportional to the cross section normal to the wind flow. Just how large is this device? Does it have an effective surface to produce 10kW?

I also think that the concept is interesting, it seems that you can "capture" more wind like this than with the standard bladed turbine. If i find more info of devices like this one i will sure post them here.

Comment by Michelle Broyles on May 7, 2010 at 8:57pm

http://www.physorg.com/news192426996.html

hmmm interesting.

Comment by A on May 7, 2010 at 3:40pm

The wind blew me here

Comment by Allen Williston on April 14, 2010 at 12:42pm

Interesting concept - that wind sail/turbine. I wonder what happens at high wind speeds. Is the sail able to "slough off" some of the wind to keep from being damaged?

Comment by Marshall Matheson on April 14, 2010 at 11:57am

Windpower Engineering Recognizes Innovators & Leaders http://bit.ly/asRbij

Comment by Douglas DeCandia on March 8, 2010 at 12:11pm

Hey Willian Ashe,
One of the wind-modifying techniques I have seen is a big-*ss funnel that was mounted in a natural, high-velocity, wind channel.
http://www.google.com/imgres?imgurl=http://static.dezeen.com/uploads/2007/11/wind_dam_in_situ_ready_sq.jpg&imgrefurl=http://www.dezeen.com/2007/11/06/wind-dam-by-chetwood-associates/&h=450&w=450&sz=75&tbnid=kcy_mkyb9EeXiM:&tbnh=127&tbnw=127&prev=/images%3Fq%3Dwind%2Bfunnel&hl=en&usg=__LIufgwl3hmFbtJ9CiNx975mzsAY=&ei=DleVS6bTL4vgtgOOiKH8Aw&sa=X&oi=image_result&resnum=2&ct=image&ved=0CA4Q9QEwAQ
This is not a new idea, though, and I am curious if this is the concept you are planning to build on. If not, could you tell me more about your idea of airflow modification? What kind of scale are we talking about? Materials?
I mean... a possible concept would be to double-duty a hydro dam. To mod the face of a hydro-electric dam to produce hydro electricity as well as wind generation. The dam valley is generally well sutited as an effective wind duct while the flat faces of the dam could serve as a wind-catcher. Slap a few v-gens on the surface of the dam, set a bunch of turbines facing downward... wind power. An unsophisticated suggestion, but is something of this scale what you are considering?

Comment by S Raghavan on March 4, 2010 at 7:25pm

I am working on a idea of small wind turbines (1Kw to 15Kw)- which can be installed on rooftops of multistory buildings. I am also working on design of wind turbine system which can work in wind speeds ranging from 5 KM/h to 10 KW/h. As soon as possible, I will upload pictures of my design.

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