[Cob] wood stove

[Joseph R Dupont]

What about catalytic convereters in stoves..
Do they help?
I've heard that charcole burned in an upper chamber does the same thing.

On Wed, 25 Aug 2004 17:40:51 -0700 (PDT) "Shannon C. Dealy"
<dealy at deatech.com> writes:
> On Wed, 25 Aug 2004 Raduazo at aol.com wrote:
> 
> [snip]
> >     I am not too sure about that, consider this: Suppose you had 
> a
> > conventional stove with a conventional chimney, except you insert 
> two T-connectors into
> > the chimney at points A and B going up the chimney. Then you 
> insert a line of
> > pipes that goes from point A through a cob bench to point B by 
> hooking in to
> > the two T-s.
> >     You start a fire in the conventional stove and it draws smoke 
> up the
> > chimney going through the A T-connector and the T-connector in the 
> conventional
> > way.
> >     Then once the chimney is drawing well you insert a metal plate 
> between
> > points A and B completely blocking the direct path up the 
> chimney.
> >     Now in order for smoke to flow from A to B it must flow out 
> the A
> > T-connector, through the bench and back into the B T-connector to 
> get up the chimney.
> >     If this was a pot belly stove or one of those stoves where the 
> chimney
> > exits from the top of the stove it would be difficult to make the 
> connections,
> > but if it is a stove where the smoke exits out the back of the 
> stove, I think
> > this would be easily doable.
> > Ed
> 
> Sorry, this won't get around the problem.  The "draw" created by a 
> chimney
> is a function of temperature and chimney height, doing as you 
> suggest will
> get the fire going and the chimney heated up which will create the 
> draw,
> then when you switch over to route the exhaust through the bench, 
> nearly
> all of the heat will be dumped into the bench (or at least that is 
> the
> intent if it is designed correctly), so the temperature of your
> exhaust gases reaching the chimney will immediately drop to possibly 
> under
> 100 degrees F. which will cool the chimney and result in a massive
> reduction in the draw.  The only way to get around this is to make 
> the
>  taller and/or make your bench less efficient at extracting heat
> from the exhaust gases (which kind of defeats the purpose).  The 
> reason
> the bench stove works is that the "chimney" (heat riser) is placed 
> before
> the bench and creates a draw (through the use of a short but very 
> hot heat
> riser/chimney) which is independent of how much heat the bench is 
> able to
> extract.
> 
> Shannon C. Dealy      |               DeaTech Research Inc.
> dealy at deatech.com     |          - Custom Software Development -
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