Ron, Crispin, Jim and all,
One stumbling point is the difference between the words Fuel and
Energy. We cook with fuels. We cook with energy. But a piece (1
kg) of wood (fuel) can deliver 16 MJ of energy if burned to ash or it
can deliver (example) 11 MJ of energy PLUS charcoal that represents 5 MJ
of energy.
The piece of wood is totally changed in both cases. But in the second
case, part of that wood has been transformed into charcoal, which is
certainly not wood. Wood consumed is 1 kg. Energy consumed is 11 MJ
(with charcoal left over). Two very different results to be reported.
And then there is the case of one kg of agricultural "refuse" that is 16
MJ if consumed totally, or 11 MJ plus charcoal if pyrolyzed, and in
NEITHER case was there any consumption of wood. Where deforestation is
an issue, stoves that can use (easily use) agricultural refuse need to
be distinguished from the wood burners.
Even when the stove testing is conducted with wood as the standard fuel,
the test RESULTS need to clearly reveal that wood did NOT need to be burned.
In the movies, "No animals were harmed in the production of this film."
For SOME cookstoves, "No wood was burned in the cooking of these meals
(or the conducting of these tests)."
What happens to the charcoal (whether burned or as biochar or otherwise
lost) should not be the issue.
Paul
Paul S. Anderson, PhD aka "Dr TLUD"
Email: [email protected] Skype: paultlud Phone: +1-309-452-7072
Website: www.drtlud.com
On 4/22/2013 6:13 PM, [email protected] wrote:
Crispin, Jim, and List
See few comments below
------------------------------------------------------------------------
*From: *
*To: *"Discussion of biomass cooking stoves"
<[email protected]>
*Sent: *Monday, April 22, 2013 8:47:51 AM
*Subject: *Re: [Stoves] FW: REQUEST for complete sets of raw data
of cookstove tests.
Dear Jim and Anyone watching
I won't have time to dig through the messages on this thread that were
in limbo. If something is really important to someone, ask again.
With regard to the char remaining and the wood that has been burned on
one end (fuel left over from tests) Harold Annegarn and I have a
proposal for how to deal with stoves that can use fuel remaining from
a previous burn. In principle, the test should be started with the
fuel left over from a previous test. In other words a cooking task
that is replicated a number of times in which the fuel left over goes
into the stove for the subsequent task provides an opportunity to
measure (quite accurately) the raw fuel drawn from the pile.
*[RWL1: I suggest that any test has to account for stoves being
used to BOTH cook AND make char*. I don't sense you will concur with
this variation.* Or can you?*
* I believe that forcing the reuse of char in many/most char-making
stoves will not be the way the char will normally be used - and
therefore will give erroneous results.*
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