[Stoves] Advancement of "better" stoves

[Art Donnelly]

Hi all,
It would be helpful in comparing the merits of biochar producing stoves
with other biomass cooking methods, to remember that a statement such as:
"Holding back carbon from combustion will increase the feedstock demand."
Is completely relative to the comparison being made. Compared to a
rocket-elbow based stove with a good operator: no doubt. Compared to the
baseline of an traditional open cooking fire: not true. I base only this on
the results that Aprovecho produced on the Estufa Finca, using the WBT, the
controlled cooking test we conducted as part of the 2010-2011 : Estufa
Finca-Santos pilot project and several years of observation and surveying
cooks. In a wood to wood comparison we consistently see approx. 40%
savings. In the no one is paying for the type of fuel that does best in the
Estufa Fincas. Even in a fuel rich area like the Talamanca many people are
paying for "stove wood" : cut to length/bundled.
best,


On Wed, May 29, 2013 at 5:39 AM, Jonathan P Gill <jg45 at icloud.com> wrote:

> Crispin,
>
> On May 29, 2013, at 5:32 AM, Crispin Pemberton-Pigott <
> crispinpigott at gmail.com> wrote:
>
>  The viability of cooking while making char pivots on two things: the
> conversion of fuel to char without increasing the raw fuel demand, and the
> rate of positive return on char placed in the soil. The data that addresses
> these issues is of great interest to me.
>
>
> Holding back carbon from combustion will increase the feedstock demand.
>  This is a non issue if the feedstock is free, or, even better, a waste
> stream with a disposal cost that can now be avoided.  Of course an
>  increase in garden productivity, or a sufficient market value for the
> charcoal,  could eliminate any extra cost even if the feedstock has to be
> purchased.  And all this with no credit for sequestering carbon.
>
> In sum, the entire value chain has to be taken into account, not simply a
> few cherry picked data points such as the increase in feedstock required.
>
> Regards,
>
> Jock
>



-- 
Art Donnelly
President SeaChar.Org
US Director, The Farm Stove Project
Proyecto Estufa Finca
<http://email2.globalgiving.org/wf/click?c=1Oy%2FmZbgIyjS5WI580KXwShvfKBcF2eaJvtN7Pi6p7Jl%2FiR4938EMMCBwY%2FuYALeA%2BQYUWN4RpvnxBsBC7e2%2BGIHcONTozBmvsUU5LTL%2FTNk4Q3vxE%2BKdXTV2cxIsFplSPh%2F9nMG3bQMQf4bz9ZK9SHMy46Z8OPLAtMAnPG9SKkPuLCWvofBTLC%2BImqax%2BZTkkF2RvDri5UdgH19NHjHOBj5WMUrS4L62Z2xxUJbBsJdDUOfeifheNFXH546Xm0yul4P2stm%2FTUOJxYnI0nFjXEaYfzxDSc%2FwgqVkR1t0USDHk30%2Fgt9UpDpyzLj37HWtnNQ0q8Jh1gZCkB4Y1Fgbg394gYFkyNqFN4MchxO2Js%3D&rp=wrhiOr2wAxUyDMDlMSqbOkKa0FpPoiCSHffb%2ByfHGClRxIFjEIrUDwAF%2BFD%2BpAPuvam9BDwvSMcadhFv7aFwKoyAXYrFk00%2B92xPIeMHXaTDJ3x0VIj6ZYwjm1win65o&up=YDTqBOjidbCUo%2Far1oAtZjp5ji73zPEvmoO14mevuXzIDUdb6Ac9W13SPOXmzL5NflZkH0HxLp0v4dT9UwEHDV0wSZ1qusv09bIKkUliWs4%3D&u=LHuflw_1TAib_lgCu2JvQw%2Fh0>
"SeaChar.Org...positive tools for carbon negative living"
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20130529/89292594/attachment.html>