Dear Paul
I would like to suggest a different way of looking at things.... look at a
stove through the eyes of the customer.
(The "Customer" is the person or Organization that pays the Manufacturer for
the Stove.)
The fundamental question should be: "What does the Customer want?"
Does the Customer want the stove to produce biochar?
Does the Customer want the stove to have the least fuel input to accomplish a
stated task?
Does the Customer want to minimize products of combustion vented into the
living space?
Does the Customer want the stove to provide a space heating benefit for the
stove user?
Does the Customer want a stove that requires extended burn times between
refuelling, and a minimum of attendance?
Does the Customer want a single firing rate throughout the burn, OR, a "Two
Level Firing Rate capability, OR a large range of firing capabilities?
etc....
"Efficiency" is basically a measure of "Resource Input to accomplish a desired
task"
It is not the purpose of "testing" to promote a particular technology or
philosophy, but rather, to measure the effectiveness of accomplishing a given
task of importance to the Customer..
"The Customer is the King." Proper Testing Protocols should allow a Customer to
test a range of stoves, under a variety of circumstances, so that he will be
able to select the stove that best meets his requirements.
Best wishes,
Kevin
----- Original Message -----
From: Paul Anderson
To: Discussion of biomass cooking stoves ; Hugh McLaughlin ; Bob Fairchild ;
[email protected]
Sent: Monday, April 08, 2013 1:50 AM
Subject: [biochar] Understanding FUEL EFFICIENCY vs Energy efficiency
Dear Stovers and Biochar makers,
We are NOT sufficiently emphasizing that TLUDs/char-maker stoves can use
fuel other than stick wood. When burning briquettes and pellets and
cobs and shells (which most other stoves cannot burn very well), we are
NOT burning tree-sourced fuel.
Crispin correctly says that a kg of wood in and pyrolyzed is no longer
wood, and therefore is FUEL used, and that relates to FUEL Efficiency.
TLUDs can consume more wood because they are converting some of that
wood into charcoal. That is different from ENERGY efficiency, which
can allow calculations for the energy in the charcoal that is not used.
Especially in char-making stoves, energy efficiency is better than the
fuel efficiency IF USING WOOD. But if the fuel is not wood, then the
WOOD-FUEL efficiency is 100% (none was burned in the cooking of the
meal), and the ENERGY efficiency might be very good, while the FUEL
efficiency (burning ag residues, dung, etc) might be low in comparison
with other stoves, but no trees were cut or burned.
About the above, there will need to be some education given to the stove
community (including GACC and manufacturers and governments). WHAT fuel
is burned does make a difference if FUEL efficiency is an important
criteria when evaluating stoves.
Just because wood is the traditional fuel used in stove testing does not
mean that stoves that can also burn OTHER biomass should be judged on
the WOOD-FUEL efficiency calculations. For places like Haiti, Rwanda,
and many large zones of numerous large countries, to be able to cook
WITHOUT FOREST DEGRADATION should be a major reason for choosing TLUD
stoves.
Having written about this here does not mean that the message has
reached the decision makers and those who report test results on
cookstoves. And the makers of "stick-wood-burning stoves" are unlikely
to want to tell this message to others.
Because the GACC is about stoves AND FUELS, I hope that proper
recognition can be given in the discussions and decisions about the
stoves that can have 100% avoidance of cutting wood, if that is important.
Paul
--
Paul S. Anderson, PhD aka "Dr TLUD"
Email: [email protected] Skype: paultlud Phone: +1-309-452-7072
Website: www.drtlud.com
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