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Dear Friends</div>
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As I recall the stoves shown have a turndown ratio of about 4.5:1. </div>
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The fuel is of two kinds: granular like pellets and wood stacked vertically. </div>
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Regards </div>
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Crispin </div>
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<div>Dean and List cc Prof. Nurhuda and Ms. Fulland</div>
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<div><span class="x_Apple-tab-span" style="white-space:pre"></span>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.</div>
<div><br>
</div>
<div><span class="x_Apple-tab-span" style="white-space:pre"></span>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.</div>
<div><br>
</div>
<div><span class="x_Apple-tab-span" style="white-space:pre"></span>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.</div>
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</div>
<div><br>
</div>
<div><span class="x_Apple-tab-span" style="white-space:pre"></span>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.</div>
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<div>Ron</div>
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<div>
<div>On Jul 19, 2015, at 2:16 PM, Dean Still <<a href="mailto:deankstill@gmail.com">deankstill@gmail.com</a>> wrote:</div>
<br class="x_Apple-interchange-newline">
<blockquote type="cite">
<div dir="ltr">Hi Ron,
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>Best,</div>
<div><br>
</div>
<div>Dean</div>
</div>
<div class="x_gmail_extra"><br>
<div class="x_gmail_quote">On Sun, Jul 19, 2015 at 7:38 AM, Ronal W. Larson <span dir="ltr">
<<a href="mailto:rongretlarson@comcast.net" target="_blank">rongretlarson@comcast.net</a>></span> wrote:<br>
<blockquote class="x_gmail_quote" style="margin:0 0 0 .8ex; border-left:1px #ccc solid; padding-left:1ex">
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<div>List: cc Prof. Nurhuda and Camilla Fulland</div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"></span>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:</div>
<div><a href="http://www.hedon.info/BP:Latest%20Issue" target="_blank"><span style="white-space:pre-wrap"></span>http://www.hedon.info/BP:Latest%20Issue</a></div>
<div>Then you have to download - but maybe first sign up.</div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"></span>2. One quote (emphasis added about being the
<b><u>most popular</u></b> stove - the first time I have seen this for a TLUD):</div>
<div><i><span style="white-space:pre-wrap"></span>"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.</i></div>
<div><br>
</div>
<div><b><i>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. </i></b></div>
<div><i><br>
</i></div>
<div><i>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.”</i></div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"></span>3. Most of the story was about the distribution system set up by Kopernik, which company can be found at: <a href="http://www.kopernik.ngo/" target="_blank">http://www.kopernik.ngo/</a></div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"></span>4. There is a good bit about a firm called Prime stoves (<a href="http://www.primestoves.com/team/" target="_blank">http://www.primestoves.com/team/</a>), headed by Ms Fulland</div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"></span>5. Dr. Nurhuda and Ms. Fulland: </div>
<div><span style="white-space:pre-wrap"></span>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?</div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"></span>I would have liked to included an address for the founders of Kopernik (<i>Wojkowska and Nakamura) </i>, so hope you will see if they also wish to comment.</div>
<div><br>
</div>
<div><span style="white-space:pre-wrap"></span>Congratulations to all involved, especially the Hedon publishers of BP, who I presume read this list some.</div>
<div><br>
</div>
<div>Ron</div>
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-- <br>
<div class="x_gmail_signature">
<div dir="ltr">
<div>Dean Still</div>
<div dir="ltr">Executive Director
<div>Aprovecho Research Center</div>
<div>PO Box 1175</div>
<div>76132 Blue Mountain School Road</div>
<div>Cottage Grove, OR 97424</div>
<div>(541) 767-0287</div>
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