This is G o o g l e's cache of http://csf.colorado.edu/mail/pfvs/2000/msg02923.html as retrieved on 20 Apr 2004 10:58:03 GMT.
G o o g l e's cache is the snapshot that we took of the page as we crawled the web.
The page may have changed since that time. Click here for the current page without highlighting.
This cached page may reference images which are no longer available. Click here for the cached text only.
To link to or bookmark this page, use the following url: http://www.google.com/search?q=cache:3dw9KSwsN88J:csf.colorado.edu/mail/pfvs/2000/msg02923.html++%22David+MacClement%22+site:csf.colorado.edu&hl=en
Google is not affiliated with the authors of this page nor responsible for its content. |
| These search terms have been highlighted: | david | macclement |
|
|
[pf] Blades travelling much faster than the wind.
< < <
Date > > >
|
< < <
Thread > > >
[pf] Blades travelling much faster than the wind.
by David MacClement
16 February 2000 02:19 UTC
Date: Tue, 15 Feb 2000 19:45:30 +0000
From: Hugh Piggott <hugh.piggott@enterprise.net>
Subject: [a-w-h] only a small percentage of the available wind
At 07:38 15/02/00 -0800, Robin Walsh wrote:
> the blades of a large wind turbine
>only occupy a small percentage of the total rotational field at any
>instant and thus draw off only a small percentage of the available wind
>energy. Is there a physical principle here that I am missing ?
It is important to understand that the amount of wind energy which you can
convert is limited to about 60% of the total energy flowing through the
turbine swept area. To catch even this much you have to let some wind flow
through the turbine.
Blades which travel fast in relation to the windspeed can be thin and few,
and yet catch all the power there is to catch.
Hugh
Scoraig, Scotland.
http://homepages.enterprise.net/hugh0piggott/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Date: Tue, 15 Feb 2000 23:22:17 +0000
From: Jim Barr <-.-.-@Barnfield.ac.uk>
Subject: [a-w-h] Re: only a small percentage of the available wind
Hugh Piggott writes:
>Blades which travel fast in relation to the windspeed can be thin and few,
>and yet catch all the power there is to catch.
May I please be the first to point out...
.... that the above lines are poetry
thanks Hugh
Jim Barr
http://www.wandana.demon.co.uk
------------------------------------------------------------------------
You have received this message because you are a subscriber to the American
Wind Energy Association's Home Energy Systems list. To view previous
messages from the list, ... go to:
http://www.egroups.com/list/awea-wind-home
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
sent on by David.
(David MacClement) davd@ihug.co.nz
www.geocities.com/Athens/Delphi/3142/Pg1-AD11.html
or better: http://www.emucities.com.au/member/davd/
****************************************************
_____________________________________________________________
Who will win the Oscars? Spout off on our Entertainment list!
http://www.topica.com/lists/showbiztalk
< < <
Date > > >
|
< < <
Thread > > >
|
Home