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 <[email protected]> wrote: > Crispin, > > On May 29, 2013, at 5:32 AM, Crispin Pemberton-Pigott < > [email protected]> 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"
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