Dean,
Thanks for the report which mentioned the importance of heat transfer but
mentioned no specifics.
Could you or Dr. Winiarski or Dr. Baldwin expand on this?
How are you improving heat transfer?
Lanny
>Both Rockets and TLUDs were improved by paying greater attention to heat
>transfer. Even though getting excellent heat transfer is well described and
>doesn’t have to cost more it is amazing that getting more heat into the pot is
>so frequently ignored. As Dr. Winiarski and Dr. Baldwin point out, optimized
>heat transfer is a vitally import element in a good stove.
----- Original Message -----
From: Dean Still
To: Discussion of biomass cooking stoves
Sent: Friday, August 02, 2013 12:07 AM
Subject: [Stoves] Stove Camp Newsletter 2013
Aprovecho Summer Newsletter
August 1, 2013
Summer Stove Camp comes to a close
Sometimes Stove Camp goes so well and summer 2013 was one of
those occasions. Many folks camped out and cooked delicious meals for everyone.
Large projects, like a couple of bread ovens, were made and used. Manufacturers
spent long, long hours testing and improving their products. Everyone worked
hard and made huge progress throughout the week, especially the two prize
winners.
There were two challenges for the week. One was sent to us by
Jordan Kowalke who is working for Total Land Care in Malawi. He is designing a
TLUD that will be used to burn wood chips for which he requested the assistance
of Stove Camp participants. Jordan sent a list of specifications that the
winning TLUD design must reach. This prize was awarded to Mick Black and
Jeffrey Santiago who tweaked Paul Anderson's Quad 3 stove until it cleanly
burned the wood chips and lasted long enough to make posho, a typical meal in
Malawi.
The other prize was for any stove that met the Tier rating of
2-3-3-3-3 (Thermal Efficiency, High & Low power PM, and High and Low power CO).
Many stoves met this criteria so participants were allowed to vote for their
favorite. The prize was awarded to David Evitt with his Guatemalan Doña Dora
stove which he toiled to improve all week.
During camp there was a ‘shotgun’ approach of many individual
tests done by many operators. For this we had three testing locations set-up.
The two Laboratory Emissions Monitoring Systems (LEMS) in the lab and a new
configuration we are calling “IAP-in-a-Box”, which is a test kitchen with a
basic hood and collection chamber that holds the Indoor Air Pollution Meter
(IAPM). This system was set up with the idea that testers can watch the live
output from the meter and gauge their design’s progress without having to do a
full test with the more complicated LEMS equipment. The “IAP-in-a-Box” is being
documented for those who wish to test total stove emissions using the small,
portable, IAP Meter. Please contact us if you are interested in getting a
system.
Last summer people did many tests on charcoal stoves and it was
obvious looking at the results that although charcoal stoves emitted a lot of
CO they were almost all very low for PM. This year we created a large graphic
representation of all the tests on the wall and added to it everyday. The
conclusion was that TLUDs generally produce lower amounts of PM than Rocket
stoves but there seemed to be two classes of TLUDS: really clean ones and only
moderately clean ones. Both Rockets and TLUDs were improved by paying greater
attention to heat transfer. Even though getting excellent heat transfer is well
described and doesn’t have to cost more it is amazing that getting more heat
into the pot is so frequently ignored. As Dr. Winiarski and Dr. Baldwin point
out, optimized heat transfer is a vitally import element in a good stove.
The progress with the TLUDs was impressive. Several of the stoves
worked well with different fuels and had adequate turn down ratio. Paul
Anderson helped everyone to understand TLUD mechanics and air control. He was
joined by Ron Larson, Art Donnelly, and others who are evolving the TLUD
approach.
There is so much work that any motivated person could do, solving
problems of the poor and moving humanity towards a more fulfilling and elegant
future. Dean joked that even a monkey could follow the iterative design method
and would eventually come up with innovative solutions to issues such as food
drying, desalinization, solar heating, and stoves. All it takes is making a
change or two per day in the prototype and seeing if it performs better or
worse. That’s what we do here at Aprovecho and we hope that it catches on.
Sincerely,
The Aprovecho Team
Photos by Simon Anderson and Sanya Detweiler. Aprovecho Research
Center is a lab based in Cottage Grove, OR--visit the main website for more
information. Please email [email protected] regarding subscription to these
updates.
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