[Stoves] Stove Camp Newsletter 2013/heat transfer

[Dean Still]

Hi Lanny,

I start with Sam Baldwin's book.

http://ebookbrowsee.com/baldwin-biomass-stoves-engineering-design-pdf-d280999584

Best,

Dean

On Fri, Aug 2, 2013 at 7:25 AM, Lanny Henson <lannych at bellsouth.net> wrote:

> **
> 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 <deankstill at gmail.com>
> *To:* Discussion of biomass cooking stoves<stoves at lists.bioenergylists.org>
> *Sent:* Friday, August 02, 2013 12:07 AM
> *Subject:* [Stoves] Stove Camp Newsletter 2013
>
>
>
>
>     [image: ARC_Logo]
>
> *Aprovecho Summer Newsletter*
>
> August 1, 2013
>
> *Summer Stove Camp comes to a close*
>
> [image: Sidwell_StoveCamp][image: Sidwell_StoveCamp]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.
>
> [image: Dona_Dora]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.
>
> [image: Dr_TLUD_Graph]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.
>
> [image: StoveCampFood]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<http://aprovecho.org/lab/index.php>for more information. Please email
> sanya at aprovecho.org regarding subscription to these updates.
>
>  ------------------------------
>
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