[Stoves] [biochar] Understanding FUEL EFFICIENCY vs Energy efficiency
Paul Anderson
psanders at ilstu.edu
Mon Apr 8 01:25:08 CDT 2013
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 <mailto:psanders at ilstu.edu>
> *To:* Discussion of biomass cooking stoves
> <mailto:stoves at lists.bioenergylists.org> ; Hugh McLaughlin
> <mailto:wastemin1 at verizon.net> ; Bob Fairchild
> <mailto:solarbobky at yahoo.com> ; biochar at yahoogroups.com
> <mailto: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 <mailto:psanders%40ilstu.edu> Skype:
> paultlud Phone: +1-309-452-7072
> Website: www.drtlud.com
>
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