12volt fan application

["elk" <elk@wananchi.com>]

Paul S. Anderson writes:

> I have used several types of forced air.  A computer fan is NOT sufficient
> in my opinion.  It can impact an established fire, but is not sufficient
> when significant air is needed to get the fire going well.

Paul- I beg to disagree....  the 12 V. fan used on your average PC power
supply has more than enough power to get a 12-inch dia. charcoal-fired jiko
up to cooking speed in 10% of the usual time. I attached one such  fan
mounted in an open-ended tin can to the side of a jiko under the ceramic
insert & the results are impressive indeed & would certainly be suitable for
any enclosed woodfuel stove- providing you can avoid direct heat & melting
plastic......

elk


--------------------------
Elsen L. Karstad
elk@wananchi.com
www.chardust.com
Nairobi Kenya



----- Original Message -----
From: "Paul S. Anderson" <psanders@ilstu.edu>
To: <willing@mb.sympatico.ca>; "stoves" <stoves@crest.org>
Sent: Tuesday, November 26, 2002 6:30 AM
Subject: Re:<12volt fan was Re: 40 W thermoelectric power


> Scott and Bruno,
>
> I have used several types of forced air.  A computer fan is NOT sufficient
> in my opinion.  It can impact an established fire, but is not sufficient
> when significant air is needed to get the fire going well.
>
> An electric hair dryer has plenty (even too much) power, but too much is
> better than not enough.
>
> Paul
>
> At 11:12 AM 11/25/02 -0600, Scott Willing wrote:
> >Thanks Bruno.
> >
> >I assumed something larger than a CPU fan would be required, but that
> >shows how much I know. I'm just an electronics techie with an
> >interest in stoves, but no expertise whatsoever. :-)
> >
> >Cheers,
> >-=s
> >
> >
> >On 23 Nov 2002 at 3:45, Bruno M. wrote:
> >
> > > Hi Stovers,
> > > The less-than-12v fans are not rare you know,
> > > every computer-fan supplier has them for
> > > CPU-cooling, in 12 and 5 Volt.
> > > I just picked 1of many examples by a Google search:
> > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > http://www.apower.com.tw/p02.htm
> > > type nr: FS0205LB
> > > size 25x25x10 mm
> > > rated voltage: 5 Volt                      rated current: 0.07A
> > > rated power 0.40W                      max speed 6,000 r.p.m.
> > > max airflow :0.85 cfm  [ 24 liter/min ]
> > > max air pressure 0.08 in. H2O      noise level 22 dBA
> > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > So you see, you can get them standard really smal.
> > >
> > > Greets
> > > Bruno Meersman
> > >
> > > P.S. I have, in the meanwhile, some more info on that aircrete stuff
> > > from Ytong, if you are still interested I'll post it here.
> > > ================================== At 17:35 Friday 22/11/2002, Scott
> > > Willing wrote: >Tom, > >This is encouraging. The Hi-Z thermopiles have
> > > a basic output voltage >of 3.3V; I thought at least two would have to
> > > be stacked to run a >typical 12V fan and I've only found one source of
> > > <12V fans. (In my >experience a 12V brushless DC fan will run at 6V,
> > > but not much less.) >Do you know the fan make/model? >I think there's
> > > general agreement that a few watts for a fan should >be lots. I don't
> > > know where this 40W figure came from. > >-=s
> > > >===================================== >On 21 Nov 2002 at 16:07, Tom
> > > Reed wrote: > > > Dear Peter and All: > > Our WoodGas Cookstove
> > > (Campstove in the U.S.) uses a 1.5 V battery > > which lasts 3 hours
> > > on high and 6 on  low, small fan and consumes 0.75 > > W.  It makes
> > > ALL the difference in combustion. > > >...cut...
> > >
> > > - ~~~~~~~~~~~<\^/>~~~~~~~~~~~~ --
> > >      To reply : mailto:brunom1@yucom.be
> > >
> > >
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> Paul S. Anderson, Ph.D.,  Fulbright Prof. to Mozambique 8/99 - 7/00
> Rotary University Teacher Grantee to Mozambique >10 mo of 2001-2003
> Dept of Geography - Geology (Box 4400), Illinois State University
> Normal, IL  61790-4400   Voice:  309-438-7360;  FAX:  309-438-5310
> E-mail: psanders@ilstu.edu - Internet items: www.ilstu.edu/~psanders
>
>
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> >
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> Elsen L. Karstad, elk@wananchi.com www.chardust.com
>
> Other Biomass Stoves Events and Information:
> http://www.crest.org/articles/static/1/1010424940_7.html Bioenergy
> http://www.crest.org/articles/static/1/1011975339_7.html Gasification
> http://www.crest.org/articles/static/1/1011975672_7.html Carbon
>
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Stoves List Archives and Website:
http://www.crest.org/discussion/stoves/200209/
http://crest.org/discussiongroups/resources/stoves/
>
Stoves List Moderators:
Ron Larson, ronallarson@qwest.net
Elsen L. Karstad, elk@wananchi.com www.chardust.com

Other Biomass Stoves Events and Information:
http://www.crest.org/articles/static/1/1010424940_7.html Bioenergy
http://www.crest.org/articles/static/1/1011975339_7.html Gasification
http://www.crest.org/articles/static/1/1011975672_7.html Carbon

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