vertical axis wind (and solar) turbine [RE-wrenches]

[Randy Sadewic]

Hi Wrenches,
I just returned from Japan where I saw a new funky wind generator.  I
asked about the performance specs and got an interesting graph that
shows the operating efficiencies and rotational speeds for different
small turbine designs.  It is the first document I have seen that makes
a comparison.  

If anyone has an interest in getting this let me know offline and pls
give feedback to all about the results since I am not an expert in this
field.

I have translated the key data but not the formulas.  This one page is
part of a 40 page document prepared by the solar wind association in
Japan.

Randy

Randy Sadewic
randy at positiveenergysolar.com
NABCEP Certified PV Installer
Positive Energy, Inc.
Phone 505 424-1112
Fax     505 424-1113
 
Enjoy the Sun!
 

-----Original Message-----
From: Matt Tritt [mailto:solarone at charter.net] 
Sent: Thursday, December 07, 2006 3:31 PM
To: RE-wrenches at topica.com
Subject: Re: vertical axis wind (and solar) turbine [RE-wrenches]



"Viable" and "vertical-axis wind turbine" would seem to be at opposite 
poles. At least where electrical energy is the plan, VAWT's have not 
shown any fundamental advantage > HAWT designs, are usually very large 
and costly (or else they don't really do much of anything) compared to 
HAWT's of the same expected output rating, and are generally marketed 
with much hype and illusory claims of performance advantages. There are 
many similar types currently being advertised, none of which (to the 
best of my knowledge) have enough merit to choose them over a 
"conventional" horizontal-axis machine.

There are a lot of companies emerging from the woodpile lately that 
claim to have "noiseless, vibration-free, roof-mounted, urban design" 
VAWT's, but most of them are just re-hashed designs from years ago that 
didn't make it. With all the current hoop-de-doo about alternative 
energy, you can be sure that this is a trend that will continue for some

time - or until the scamsters are exposed to the light of day.

On the other hand, it would be interesting to see the frequency output 
from the rotating PV cells; one can only imagine. :-)

Matt T

Tom Elliot, Guffey Energy Works wrote:

>Yikes,
>
>Here's the money quote "Solar cells are cooled by the rotation, thus 
>generating more electricity".  Wow.
>
>So there aren't any viable vertical axis turbines yet?  (I'm not a wind
guy)
>
>Tom
>
>
>----- Original Message ----- 
>From: "Jim Duncan" <ntrei at earthlink.net>
>To: <RE-wrenches at topica.com>
>Sent: Monday, December 04, 2006 5:41 PM
>Subject: RE: vertical axis wind (and solar) turbine [RE-wrenches]
>
>
>
>
>Tom Elliot wrote:
>  
>
>>Does anyone have any information on this?
>>
>>http://www.quietrevolution.co.uk/index.htm
>>
>>Tom
>>
>>    
>>
>Heck that's nothing. Check out this one.
>http://www.bluenergyusa.com/
>
>Jim Duncan
>North Texas Renewable Energy Inc
>Fort Worth, Texas
>
>
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[Non-text portions of this message have been removed]


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