[Stoves] Grates and chimneys

Wed Feb 8 06:55:42 CST 2012

Dear Roger and Bridget,
There's really no reason to be offended. Your video shows a great deal 
of winsomeness and demonstrates a beautiful little stove. I hope you can 
recognize that it's not really priced for the rural Indian market.

A couple of observations occur to me. First, there seems to be some 
confusion about heat transfer in your presentation. I hope that I 
calculate correctly that the maximum heat output is something around 
8.8kW. The typical electrical stove-top heating field where I live, will 
on one of the cooking positions have a _significantly_ lower heat output 
than your stove; therefore, it is quite appropriate to turn the stove 
way down in order to cook. That, however, this is true, says something 
about this feature. What it says to me, and I may be quite wrong, but 
throw it into the discussion round as a thoroughly neutral observation 
is the following: Excess air conditions, which may be completely 
appropriate for the primary ignition --> steady state phases of a 
fueling/ignition/burning-cycle, explain why the stove top is not so hot 
for cooking when the air intake is set on max. I think it also at least 
_likely_ that under some conditions the max-air setting may also be 
detrimental to the exhaust air quality. My assumption in stating this is 
that it is likely that the incoming excess air is lowering the temps in 
the secondary burn area of the stove thus making for suboptimal 
completion of gas reactions.

Secondly, since it isn't transparent for me what the heat value of your 
fuel actually is, I can't calculate what the heat output of the stove 
into the room is for the time of 6-10 hours at the low setting. I think 
that value would be quite helpful for someone thinking about purchasing 
such a stove for the intended boat, trailer or portable home (yurt or 
whatever) situation. The respective flue temps would also be helpful for 
such a calculation and consideration.

Thanks for the video.

regards,
ronald von momentansonnigbayern

On 08.02.2012 08:37, Fireside Hearth wrote:
> Dear Xavier,
>
>        I should be offended, but alas, I will send you a video link 
> instead........yes our stove has a chimney!
>
> http://www.youtube.com/watch?feature=player_detailpage&v=vkz6gKLayvc 
> <http://www.youtube.com/watch?feature=player_detailpage&v=vkz6gKLayvc>
>
>    Roger and Bridget Lehet.
>
> > From: xvr.brandao at gmail.com
> > To: stoves at lists.bioenergylists.org
> > Date: Tue, 7 Feb 2012 23:59:35 +0100
> > Subject: [Stoves] Grates and chimneys
> >
> > " It is unfortunate that people produce stoves that have chimneys, 
> but are
> > not actually clean-burning."
> > Do we actually have chimney stoves that do not clog up after few
> > months/years? Even the cleanest stoves? Is it a good idea to build 
> chimney
> > stoves at all?
> >
> > "Your grate price is good! I think we should be jealous! It would be so
> > nice to be able to get good parts in cast iron."
> > Hell yes, I can make 1 dollar iron grates, but I wish we could make 
> 1 dollar
> > cast iron grates in Benin. In fact, cast iron is very rare in Benin 
> (West
> > Africa? Africa?). When Africa will have the industrial production 
> capacities
> > of Asia, things will change!
> >
> >
> >
> > -----Original Message-----
> >
> > Message: 4
> > Date: Tue, 7 Feb 2012 00:14:57 -0500
> > From: "Crispin Pemberton-Pigott" <crispinpigott at gmail.com>
> > To: "'Discussion of biomass cooking stoves'"
> > <stoves at lists.bioenergylists.org>
> > Subject: Re: [Stoves] advice for chimney wood stove for rural Burkina
> > Faso
> > Message-ID: <015301cce557$70642af0$512c80d0$@gmail.com>
> > Content-Type: text/plain; charset="us-ascii"
> >
> > Dear AD
> >
> >
> >
> > Your story is not very unusual. It is unfortunate that people 
> produce stoves
> > that have chimneys, but are not actually clean-burning. My point is that
> > just because one produces a chimney stove is no excuse not to use that
> > additional expense to create the draft needed to completely burn the 
> fuel.
> > Astonishing really.
> >
> >
> >
> > I wonder if there is too much emphasis on 'clean indoor air' without 
> enough
> > emphasis on 'not needing to worry about clean indoor air' in the first
> > place.
> >
> >
> >
> > That level of deposition is depressing. I heard about a stove being 
> produced
> > in the tea country high in Kenya which is used for space heating and
> > cooking, According to the designer the 3 inch chimney would clog 
> after three
> > months. That is ridiculous! What kind of crummy combustion is that?
> >
> >
> >
> > A chimney is as good as a fan - especially 3.5 metres. Fan stoves are
> > supposed to be really clean or you have not done a good job. Shoving bad
> > combustion outside does not solve much. The situation in Ulaanbaatar is
> > exactly like that. No one has a stove without a chimney. The air 
> outside is
> > so polluted that it is contaminating the air drawn into the homes. 
> So the
> > chimney solved nothing - the problem is the stove.
> >
> >
> >
> > Your grate price is good! I think we should be jealous! It would be 
> so nice
> > to be able to get good parts in cast iron.
> >
> >
> >
> > Thanks
> >
> > Crispin
> >
> >
> >
> >
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> >
>
>
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