[Stoves] (no subject) (K McLean)

[K McLean]

Christa, you and Crispin both suggested charcoal displacement as the reason
for the efficiency improvement.  This is a simple explanation that
justifies the use of rocks and a second grate in the mbaula.

Do you think there may be other factors involved, too?  In the Zambian
mbaula testing, efficiency was improved 41%.  The charcoal displacement was
not close to 41%.  I'll try to think of other tests that allow for charcoal
displacement.


On Wed, Oct 30, 2019 at 3:18 PM Christa Roth (bioenergylist) <
stoves at foodandfuel.info> wrote:

> Ron,  you keep repeating: *We have no idea yet on why simple rocks and
> extra grates are doing so much.   (Anyone have an idea why?  My next
> message more on that)*
> And I have provided an answer to that numerous time and sent the link to
> the AProvcho article on the importance of the initial load:
> You can save an enormous amount of charcoal if you limit the amount that
> people load into a stove. The Zambian brazier is completely overpowered as
> people load it to the brim. Adding a grate and filling the existing volume
> with stones prevents that people can land the same amount of charcoal as
> the stones displace the charcoal.
> Same as putting a brick in the tank for the toilet flush saves water, as
> it fills part of the volume.
>
> I did testing on the Zambian brazier today (it was loaded with 900 g of
> charcoal as people tend to fill it up) , and we cooked the same meal with
> less than half the charcoal on any of the other stoves where we only loaded
> with an initial 310-350 g of charcoal
>
> That is my answer
> Christa
>
> Am 30.10.2019 um 19:13 schrieb Ronal Larson <rongretlarson at comcast.net>:
>
> Bernhard and list,  cc Kevin
>
> 1.  Kevin responded to your increasing CO comment (below) - saying CO not
> yet measured.   (This following Kevin’s message re adding rocks and an
> extra grate to the Zambian  (char-burning) “Mbaula” - giving maybe 40% fuel
> saving.
> 2.  I guess that the reverse is likely: less CO.   My reason is the
> horrible production of CO - which drives down efficiency.  Kevin’s
> efficiency is going up - not down
>
> 3.  This is mainly to hope that we can find someone (in nGermany?) to make
> the measurement.  Important because Kevin is achieving a huge tree-saving
> result at almost no cost.
>
> 4.  We have no idea yet on why simple rocks and extra grates are doing so
> much.   (Anyone have an idea why?  My next message more on that)
>
> Ron
>
> Ps - Thanks for all you have done for solar cookers (I own one of your 1
> meter parabolic designs).  Your BABAMOTO stove (see below) looks quite
> interesting.  I was happier to read your piece on char-*making* stoves at:
>
> https://vignette.wikia.nocookie.net/solarcooking/images/b/b6/Gasifier_Stoves%2C_Bernhard_Muller%2C_3-21-16.pdf/revision/latest?cb=20160322185245
> <https://vignette.wikia.nocookie.net/solarcooking/images/b/b6/Gasifier_Stoves,_Bernhard_Muller,_3-21-16.pdf/revision/latest?cb=20160322185245>
>
>
>
> On Oct 27, 2019, at 11:19 AM, Bernhard Müller <bs_mueller at gmx.net wrote:
>
> Kevin,
> the way I understand this system is to obtain efficiency for the price of
> more CO production.
> Bernhard S. Müller
> Mühlstr. 26
> 65760 Eschborn
> bs_mueller at gmx.net
> https://www.babamoto.org
> https://www.afrishiners.solar
>
>
>
>
>
> Am 27.10.2019 um 18:00 schrieb stoves-request at lists.bioenergylists.org:
>
> (no subject) (K McLean)
>
>
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