Brian P. asks:
> Why not design the
>turbine to survive in an unloaded state up to 120 mph? This is the kind I
>would buy for my own use! Maybe this is the kind Hugh would build for his
>own use?
>Hugh Responds:
>That would be nice! The Proven is the only one I know which can do this.
>But you will need passive pitch control, which is neither easy to build,
>nor is it free from wear and tear.
Hugh,
You missed one company! All Bergey Windpower Company turbines are designed
to operate in an unloaded state and do so automatically as a function of
charge regulation. They will survive in 120mph winds, loaded or not.
Hi Brian, I am not trying to sound impossible here, but unless you can think of some way to overcome the drawbacks that I see (and will mention), it might be...
Michael Klemen
makbek@...
Sep 1, 1999 12:22 am
Michael is correct in that most low cost rotating cup anemometers have a time constant. The time constant (distance constant in the met. field) is 10 feet (3m)...
David Blittersdorf
davidb@...
Sep 1, 1999 1:10 am
... However it will probably give better advance warning of a gust than simply looking at the turbine rpm. Provided Brian has a foolproof, automatic, ...
hugh piggott
hugh.piggott@...
Sep 1, 1999 3:55 am
Brian, I also think an anometer would be too unprecise to control stalling. We use a voltage reading relay (frequency reading can also be used). In strong...
Claus Nybroe
windmission@...
Sep 1, 1999 5:54 am
If you are going to allow a measured variable to be used in an emergency control situation then wouldn't the voltage / Current / frequency rise be determined...
Clarke, Rob
ClarkeR@...
Sep 1, 1999 1:15 pm
... I'd like to make it very clear that this is not an emergency system, that is the whole point. He has to have a very good emergency shut down (preferrably...
hugh piggott
hugh.piggott@...
Sep 1, 1999 2:33 pm
This discussion on "control" maybe should be referred to as protection strategies. To me, the protection features of a turbine should be integral to the...
Brent Peterson
bcpeters@...
Sep 2, 1999 1:39 am
... That would be nice! The Proven is the only one I know which can do this. But you will need passive pitch control, which is neither easy to build, nor is...
hugh piggott
hugh.piggott@...
Sep 2, 1999 3:21 am
Eric eggelston wrote ... From: Tom Gray <tomgray@...> To: awea-wind-home@egroups.com <awea-wind-home@egroups.com> Date: 01 September 1999 14:45 Subject:...
pbrian@...
Sep 2, 1999 10:17 am
... Hugh, You missed one company! All Bergey Windpower Company turbines are designed to operate in an unloaded state and do so automatically as a function of ...
Spwilke@...
Sep 2, 1999 2:16 pm
At 10:18 AM 9/2/99 -0400, Spwilke@... wrote: [...] All Bergey Windpower Company turbines are designed ... I daresay this is one reason Bergey machines have...
Alan Muller
amuller@...
Sep 2, 1999 11:22 pm
... Sorry, I forgot. That's one thing which has puzzled me about BWC turbines. What is the speed control actually, is it the variable blade pitch, or is it...
hugh piggott
hugh.piggott@...
Sep 2, 1999 4:52 pm
The machines do run faster unloaded, but not excessively so (unloaded TSR of around 11). Furling slows the blades and protects the turbines in winds above...
Spwilke@...
Sep 3, 1999 1:46 pm
pgip-@... wrote: Steve, Good to have you on board. You could add that the speed up of the rotor unloaded, while not excessive, is easily audible. I can...
pgipe@...
Sep 3, 1999 1:55 pm
... wow simple arithmetic tells me that the blade tips can reach 11 x 30 = 330 rpm. That sounds noisy to me. I would prefer to use a dump load. ... Thanks....
hugh piggott
hugh.piggott@...
Sep 15, 1999 8:18 am
... Any wind turbine can run unloaded, but with some it is more advisable than others. The proven is slightly noisier unloaded but the speed only increases by...
hugh piggott
hugh.piggott@...
Sep 20, 1999 7:35 am
... I'm afraid you'd be wrong on that Hugh. Our turbines only speed up slightly if unloaded. Mike Bergey Bergey Windpower Co....
Mike Bergey
mbergey@...
Sep 20, 1999 4:07 pm
let's start from the beginning... ... Steve Wilke of Bergey Windpower wrote ... Paul Gipe and maybe hugh wrote <something about noise, I can't remember what> ...
hugh piggott
hugh.piggott@...
Sep 20, 1999 9:03 pm
... Give or take a slight. TSR's are typically in the 7 - 8.5 range. ... There are two categories: 1) "for a while" and 2) essentially forever. Our products...
Mike Bergey
mbergey@...
Sep 21, 1999 12:39 am
Mike ... OK, thanks for making that distinction. And sorry if I appeared to slight your turbine. BWC wind turbines are legendary. I know of one Excel which ...
hugh piggott
hugh.piggott@...
Sep 21, 1999 7:07 am
... Well, why don't you advertise all of the reasons why we would want to buy a Bergey? Until Steve told us they can run unloaded, I don't belive I knew that....
Michael Klemen
makbek@...
Sep 21, 1999 5:44 pm
Mike, As someone contemplating purchasing a Bergey Excel, I'd appreciate your comments on the noise when you were observing the governing. At my site, we will...
Ron Rosenfeld
ronrosenfeld@...
Sep 21, 1999 6:14 pm
Ron, I have a Bergey 10kw Excel 180' from the back of my house on a 80' tilt-up tower. We just went through the remains of Hurricane Floyd here in Vermont last...
David Blittersdorf
davidb@...
Sep 21, 1999 9:43 pm
Hi Ron, I'll be passing by the Excel again this weekend on my way out to my brother's place. I'll bring my notebook PC, and hopefully I can get you a...
Michael Klemen
makbek@...
Sep 22, 1999 4:16 am
Mike, A WAV file would be great! My wife and I found one that was virtually inaudible at 200 ft, but the windspeed was only about 11-12 mph. One of the siting...
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