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: [email protected]
> To: [email protected]
> 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" <[email protected]>
> To: "'Discussion of biomass cooking stoves'"
> <[email protected]>
> Subject: Re: [Stoves] advice for chimney wood stove for rural Burkina
> Faso
> Message-ID: <[email protected]>
> 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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