[Stoves] Stove Matrix version 2
Robert Fairchild
solarbobky at yahoo.com
Mon Apr 8 06:01:22 CDT 2013
All,
Here it is as an attachment.
Bob
--- On Mon, 4/8/13, Paul Anderson <psanders at ilstu.edu> wrote:
From: Paul Anderson <psanders at ilstu.edu>
Subject: Re: [Stoves] [biochar] Understanding FUEL EFFICIENCY vs Energy efficiency
To: "Discussion of biomass cooking stoves" <stoves at lists.bioenergylists.org>
Cc: "Kevin" <kchisholm at seaside.ns.ca>, biochar at yahoogroups.com, "Hugh McLaughlin" <wastemin1 at verizon.net>, "Bob Fairchild" <solarbobky at yahoo.com>
Date: Monday, April 8, 2013, 2:25 AM
Dear Kevin, Crispin and all,
We are in agreement.
"Stove Testing" is an expression that has different meaning to
different people. WBT is one of the tests of stoves. Just like
we want to have the Safety analysis reported.
Kevin's list of questions should be part of a Table of Stove
Characteristics that includes price, etc etc etc. I have
not seen such a table since I posted a Cookstove Matrix in March
2006. Here is the description and the link, but I cannot see the
actual matrix. Erin or Tom, can you find it?
http://stoves.bioenergylists.org/stove-matrix
Anyway, the point is that we need these kinds of consolidations of
the many factors.
Paul
Paul S. Anderson, PhD aka "Dr TLUD"
Email: psanders at ilstu.edu Skype: paultlud Phone: +1-309-452-7072
Website: www.drtlud.com
On 4/8/2013 12:40 AM, Kevin wrote:
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 ; biochar at yahoogroups.com
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: psanders at ilstu.edu
Skype: paultlud Phone: +1-309-452-7072
Website: www.drtlud.com
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