Re: 12volt fan application

["Scott Willing" <willing@mb.sympatico.ca>]

An example of what I consider to be a typical computer cooling fan 
has specs such as 12V, 0.16A (i.e. ~2W) at 27CFM and is about 80mm 
square. Is 27CFM useful in a small stove?

What I consider to be a CPU cooling fan (and what I assumed Bruno was 
talking about) is yet smaller (60 x 60mm), as it's designed to sit 
right on the heatsink for the computer processor chip (e.g. Pentium 
etc.) Some people refer to the box that holds the motherboard, power 
supply, disk drives etc. as the "CPU" so there may be some confusion 
there as to what constitutes a "CPU" fan.

I would have expected such fans to be lower in throughput than the 
27CFM model I have sitting on my desk, but a quick glance at the net 
turned up one rated at 36CFM @ 12V.

Perhaps Bruno could share what sort of specs are typical of the 5V 
fans that he knows of.

-=s


On 26 Nov 2002 at 7:57, elk wrote:

> 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
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