[Stoves] Story about a successful TLUD in Indonesia

[Crispin Pemberton-Pigott]

Dear Friends

As I recall the stoves shown have a turndown ratio of about 4.5:1.

The fuel is of two kinds: granular like pellets and wood stacked vertically.

Regards
Crispin

Dean and List  cc Prof. Nurhuda and Ms. Fulland

                Agreed.  Turn Down Ratio (TDR) is critical.  We should be able to get 3:1 with TLUDs - and maybe more (Kirk Harris has sometimes done better).  I should have asked Prof. Nurhuda and Ms. Fulland to comment on TDR and power levels as well as my other questions.  The story says they developed a larger TLUD model because of customer feedback.   The video of operation shows a sliding door that certainly can have a maximum/minimum aperture ratio much greater than 3.

                Your comment on avoiding constant tending is very important. Present testing is not mirroring what happens in the field.   I hope that we can hear of new EPA/GACC stove testing protocols that include both limiting tending time and recording it.

                I should have also noted that a standard fuel for this stove is short hunks of relatively thin branches.  Takes some more effort but can go quick with a machete or axe/hatchet.  That’s a lot faster/easier than splitting large logs and not much more work than cutting to a uniform  length.  I’ve forgotten the optimum angle for cutting but I think is a little more acute than 45 degrees.  Stacking vertically leaves too large an air space (not enough flow resistance).  I hope we can hear more about the satisfaction in the Philippines also with this fuel.


                Best of luck in your upcoming stove camp.  Aprovecho is providing a very valuable service.  Please give us some daily feedback on what is happening soon in Cottage Grove.

Ron


On Jul 19, 2015, at 2:16 PM, Dean Still <deankstill at gmail.com> wrote:

> Hi Ron,
>
> We have also gotten positive feedback about using TLUDs. In my opinion, folks seem to like the batch fed stoves, like coal, charcoal, liquid, and gas that don't need constant tending. They may not like a TLUD if it burns the rice, etc. with inadequate turn down. Propane stoves, and other stoves, can have too low high power for making good tortillas.
>
> Best,
>
> Dean
>
> On Sun, Jul 19, 2015 at 7:38 AM, Ronal W. Larson <rongretlarson at comcast.net> wrote:
> List:  cc Prof. Nurhuda and Camilla Fulland
>
>       1.  This is to encourage all stovers to read the nice story about the Indonesian firm “Kopernik”, with much about Prof. Nurhuda and his TLUD stove, and the firm “Prime Stoves”.   I get the (free) print copy of “Boiling Point” (BP), but think you can get there through:
>       http://www.hedon.info/BP:Latest%20Issue
> Then you have to download - but maybe first sign up.
>
>       2.  One quote (emphasis added about being the most popular stove - the first time I have seen this for a TLUD):
>       "In their search for an appropriate cookstove, Wojkowska and Nakamura were introduced to Professor Muhammad Nurhuda, a lecturer in theoretical physics at Brawijaya University in Malang, East Java. Professor Nurhuda had been working on the development of a top-lit uplift gasifier stove, named the UB.03-01 stove. This stove used up to 80% less wood than a three-stone cookfire and produced no smoke when burning dry fuel. Made from sheet metal, the stove was lightweight and easy to transport - a valuable feature in order to expand distribution to remote islands. The factory price of the stove, less than US$ 13, was far lower than imported cookstoves (in the range of US$ 30-50) and there was no risk of shipments being delayed in customs. This confluence of innovative design, fuel-efficiency, portability and affordability made the stove extremely attractive from a technical and economical viewpoint.
>
> The UB.03-1 stove was regularly selected as the most popular clean cookstove at these events. In Bojonegoro, East Java, it was voted the most popular product of all technologies including solar lights, water filters and agricultural technologies.
>
> A further key supply chain development came in late 2013 when Norwegian investment group Differ became the majority investor and distributor of Professor Nurhuda’s UB.03-1 cookstove.”
>
>       3.  Most of the story was about the distribution system set up by Kopernik, which company can be found at:   http://www.kopernik.ngo/
>
>       4.  There is a good  bit about a firm called Prime stoves  (http://www.primestoves.com/team/), headed by Ms Fulland
>
>       5.   Dr.  Nurhuda and Ms. Fulland:
>       Can you add anything on why the stove purchasers liked your TLUD stove better than others?  (time saving?  using the char?, smoke reduction?,  able to use small branches?, making money?, saving money?, etc?
>
>       I would have liked to included an address for the founders of Kopernik (Wojkowska and Nakamura) , so hope you will see if they also wish to comment.
>
>       Congratulations to all involved,  especially the Hedon publishers of BP, who I presume read this list some.
>
> Ron
>
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> --
> Dean Still
> Executive Director
> Aprovecho Research Center
> PO Box 1175
> 76132 Blue Mountain School Road
> Cottage Grove, OR 97424
> (541) 767-0287
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