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<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">Dear Friends</div>
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<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">The two-pot, one-fire stove is a staple in places like Sri Lanka. There is a helpful Practical Action video in English showing the production of the common product:</div>
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<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">https://www.google.com/url?sa=t&source=web&rct=j&url=https://m.youtube.com/watch%3Fv%3Dz8oGUHDEDpY&ved=2ahUKEwix4YaQ9-rhAhUO2FkKHbGNDKYQwqsBMAB6BAgJEAU&usg=AOvVaw1xLbIsxqNtadxTnvxMKzJo</div>
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<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">I hope that link works. It looks messy. </div>
<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;"><br>
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<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">The layout is efficient and the diagonal chimney is creating the draft needed to keep the smoke away from the first pot. </div>
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<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">Note that the first pot seals the hole at cooking station one. </div>
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<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">What Kevin is exploring is the better combustion of the wood. There are a number of ways to do this. The oldest I know of is the traditional Ugandan trench stove that was tested in
Uganda in 2008 as part of the USAID project that convinced them to drop stoves altogether. </div>
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<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">It is shown in the project photos and essentially tried to introduce some air below the fire. If combined with a grate of some kind (which it was not) it would be fire. The problem
is the free grate. </div>
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<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">Kevin has been promoting an interesting extremely cheap set of three. Bent reinforcing steel bar wood supports that hold the tips of the wood above the ground when they are burning.
Obviously this has limitations because wood is not infinitely long but clearly it saves fuel by was burning some of the smoke, and the char that is often left on the ground at the end. </div>
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<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">Elevating the char itself is the trick. If the stick is elevated at the burning point, the char attached to it is getting "under air" and burns cleaner. Char can be elevated and
aerated by many methods, including, as Kevin has demonstrated, putting a perforated clay disk, or a layer of round stones on the ground between three stones that support the pot. It is functionally the equivalent of the wedge-shaped metal insert being promoted
in India that has holes through the upper surface. Some readers may recall that being shown on this channel a few years ago. </div>
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<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">It is also the main function of the two-part tilted grate demonstrated in the SAE Stove and Keren Super in Central Java which was developed in the WB's Indonesian Stove Pilot Project. </div>
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<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">There are variations on the theme demonstrated elsewhere. What Kevin shows, I think, is that using the very inexpensive clay grate (which identical in appearance to the grate in the
Indonesian Jolento and Anglo (Thai bucket) stoves) produces much better results than a three stove fire in terms of fuel consumption, combustion temperature, smoke and CO. </div>
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<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">The cook will notice higher cooking power, faster lighting and less smoke. </div>
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<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">Having spent some time experimenting with various ways to elevate the fire enough to get air under the fuel at the centre, Kevin demonstrated that round stones placed on the ground
in the centre, either between the pot-supporting elements. </div>
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<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">This could be added to any stove with a flat floor on which the fuel burns, in that any grate (passing air under the fire) is better than none. The clear advantage was measured recently
in the Cambodian lab and at the SeTAR Centre in Johannesburg. </div>
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<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">A rocket stove's overall fuel performance can be improved by adding a grate under the tips of the wood, or between the wood and the floor under the fuel support, or on the floor of
the stove. Tossing in a layer of round stones that sits on the floor in such a way that it elevates the char and doesn't interfere with the primary air supply to the wood will also produce that result: better and hotter combustion of the char normally left
sitting at the bottom of the stove. </div>
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<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">There are times when one doesn't want the char to be burned in this fashion. There is a two-station traditional stove $are in one province of Indonesia that provides for the char
to be produced under a pot and has a flat platform protruding from the front of the fire chamber. The char is raked back onto this platform and meat or vegetables is roasted over it. </div>
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<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">Adding a few round stones to the centre of any fire, a bit smaller than a hen's egg, is a very low cost way of improving the performance of the stove. Not in Northern Moçambique near
the coast, of course because there are no stones, but in many places there are. </div>
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<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">In Yogyakarta we made a set of tools for making a clay grate with no holes at all, but instead a set of upside down feet each of which looked like one bump on a civil engineering
"sheep's foot roller". This allows air to enter the fire sideways just under the fire while the char is elevated just enough to burn properly with the wood instead of afterwards. </div>
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<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">I commend Kevin for his continued interested and innovations. </div>
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<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">Regards </div>
<div name="BB10" id="BB10_response_div_BBPPID" dir="auto" style="width:100%;">Crispin </div>
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<div id="from"><b>From:</b> rongretlarson@comcast.net</div>
<div id="sent"><b>Sent:</b> April 25, 2019 12:02 AM</div>
<div id="to"><b>To:</b> stoves@lists.bioenergylists.org</div>
<div id="reply_to"><b>Reply to:</b> stoves@lists.bioenergylists.org</div>
<div id="subject"><b>Subject:</b> [Stoves] Fwd: Simple Modifications to Traditional Wood Cookstoves - Rocks and Clay Grates</div>
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<div dir="auto" class="" style="word-wrap:break-word">List: cc Kevin M</div>
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<div class=""><span class="Apple-tab-span" style="white-space:pre"></span>1. This is to bring you up-to-date on Kevin McLean’s “zero cost” stove work - that I have learned in the last 4 weeks.. This today is on three (mainly one) new concepts (despite keeping
the thread name). It has applicability especially to those working with Rocket stoves - but I am pretty sure he/we can find ways to work also with TLUDs. </div>
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<div class=""><span class="Apple-tab-span" style="white-space:pre"></span>2. After Kevin sent me 3 short videos a few days ago, we agreed there could be great benefit to his and everybody’s stove research to get this early work out for discussion. So this
is to ask everyone to view Kevin’s annotated 2 minute video on an approach I have not previously seen:</div>
<div class="">
<div class=""><span class="Apple-tab-span" style="white-space:pre"></span><a href="https://nam05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F1EJQEKKkMTQbcKn3kBC1YZ50oqtZPsbym%2Fview&data=02%7C01%7C%7C39647a26ff924621097708d6c932d5b0%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636917617497762873&sdata=YoLqMafxKJpPjFGK4NFlKlVeC05A5XaMexKenR94ZUQ%3D&reserved=0" class="">https://drive.google.com/file/d/1EJQEKKkMTQbcKn3kBC1YZ50oqtZPsbym/view</a>.
</div>
<div class=""> I am amazed that so much energy gets to the second pot (and he may develop a 3 pot design, that also looks well worth the relatively small added extra cost). No metals anywhere.</div>
<div class=""><span class="Apple-tab-span" style="white-space:pre"></span>Anyone seen this before? </div>
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</div>
<div class=""> <span class="Apple-tab-span" style="white-space:pre"> </span>3. I will try to report soon on two other new (to me) very low cost stove improvement areas on which Kevin has also been working - and which I am unaware of any others pursuing: </div>
<div class=""><span class="Apple-tab-span" style="white-space:pre"></span>- adding energy storage using movable hot rocks or bricks (headed to hay baskets maybe?)</div>
<span class="Apple-tab-span" style="white-space:pre"></span>- making char while cooking (and NOT with TLUDs)</div>
<div class=""><span class="Apple-tab-span" style="white-space:pre"></span>Can anyone give a lead to these storage and char-making areas?</div>
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<div class=""><span class="Apple-tab-span" style="white-space:pre"></span>4. The 4th area of our discussions since the message below still seems brand new:<span class="Apple-tab-span" style="white-space:pre">
</span><br class="">
<span class="Apple-tab-span" style="white-space:pre"></span>- improved air flow with 3-stones - using "rocks and clay grates” to elevate the fuel.</div>
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</div>
<div class=""><span class="Apple-tab-span" style="white-space:pre"></span>5. Since Kevin is adamant on zero costs to users (and minimum costs allowable when payback time is short), these ideas are not amenable to most companies looking at the 3-stone-user
market. Accordingly, Kevin will not be patenting any of this - all 4 areas will be open source.<span class="Apple-tab-span" style="white-space:pre">
</span> <br class="">
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<div class=""><span class="Apple-tab-span" style="white-space:pre"></span>Anyone working on any of these 4 areas? Or know of past results from anywhere?</div>
<div class=""><br class="">
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<div class="">Ron</div>
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<div class="">Begin forwarded message:</div>
<br class="Apple-interchange-newline">
<div class="" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px">
<span class="" style="color:rgba( 0 , 0 , 0 , 1 )"><b class="">From: </b></span><span class="">Ronal Larson <<a href="mailto:rongretlarson@comcast.net" class="">rongretlarson@comcast.net</a>><br class="">
</span></div>
<div class="" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px">
<span class="" style="color:rgba( 0 , 0 , 0 , 1 )"><b class="">Subject: </b></span><span class=""><b class="">Re: [Stoves] Simple Modifications to Traditional Wood Cookstoves - Rocks and Clay Grates</b><br class="">
</span></div>
<div class="" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px">
<span class="" style="color:rgba( 0 , 0 , 0 , 1 )"><b class="">Date: </b></span><span class="">March 29, 2019 at 3:01:27 PM MDT<br class="">
</span></div>
<div class="" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px">
<span class="" style="color:rgba( 0 , 0 , 0 , 1 )"><b class="">To: </b></span><span class="">Discussion of biomass cooking stoves <<a href="mailto:stoves@lists.bioenergylists.org" class="">stoves@lists.bioenergylists.org</a>><br class="">
</span></div>
<div class="" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px">
<span class="" style="color:rgba( 0 , 0 , 0 , 1 )"><b class="">Cc: </b></span><span class="">K McLean <<a href="mailto:info@sun24.solar" class="">info@sun24.solar</a>><br class="">
</span></div>
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<div dir="auto" class="" style="word-wrap:break-word">List, cc Kevin</div>
<div dir="auto" class="" style="word-wrap:break-word"><br class="">
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<div dir="auto" class="" style="word-wrap:break-word"><span class="Apple-tab-span" style="white-space:pre"></span>This is to encourage this list to view the two “Sun24” links given below. Because I was so impressed when I viewed those, I had a nice phone
conversation with Kevin yesterday. A few things I learned:</div>
<div dir="auto" class="" style="word-wrap:break-word"><span class="Apple-tab-span" style="white-space:pre"></span> Kevin is a retired lawyer. Retired for only a year, but already in contact with stove-knowledgeable NGOs in many countries. Through them, he
is offering - for free - improvements in 3-stone use of doubled efficiency, and improved emssions. Working also with some low-cost rocket designs. Not yet working on TLUDs - but knowledgeable about them, and supportive at the right price. Has stove modifications
measured in multiples of 10k, I think (in only a few past months).</div>
<div dir="auto" class="" style="word-wrap:break-word"><br class="">
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<div dir="auto" class="" style="word-wrap:break-word"><span class="Apple-tab-span" style="white-space:pre"></span>His emphasis on major stove improvements at zero cost (better air delivery), with local NGO support, is something we have been mostly missing in
our stove development efforts. Emphasis zero cost - described at these two sites given below.</div>
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<div dir="auto" class="" style="word-wrap:break-word">Ron</div>
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<div class="">On Mar 28, 2019, at 9:24 AM, K McLean <<a href="mailto:info@sun24.solar" class="">info@sun24.solar</a>> wrote:</div>
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<div class="gmail_default" style="font-size:small">Sun24 and its partners operate at the primitive end of the cookstove spectrum.</div>
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<div class="gmail_default" style="font-size:small">We have found that both rocks (or broken clay bricks) and a clay grate improve open-fire wood cookstoves' efficiency. Here are examples of rocks and a clay grate in a three-stone cookstoves:</div>
<div class="gmail_default" style="font-size:small">
<div class=""><span id="cid:ii_jtsqp0pr0" class=""><Rocks in <wbr><a href="http://3-stone.jpg">3-stone.jpg</a><wbr>></span>
<div class=""><span id="cid:ii_jtsqp0r91" class=""><Clay disc grate in 3-stone <wbr>
<a href="http://stove.jpg">stove.jpg</a><wbr>></span><br class="">
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<div class="gmail_default" style="font-size:small"><a href="https://nam05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F183kPF5DrwIR5mdDhE7xC9AaNJLaorGZt%2Fview%3Fusp%3Dsharing&data=02%7C01%7C%7C39647a26ff924621097708d6c932d5b0%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636917617497772879&sdata=QHVmk6eMWsJNjJMSBsb%2BKnaXTIAW0fb55Cu9hrN7Qf0%3D&reserved=0" class="">SNV
tested</a> the rocks and clay grate in its open-fire stove. Here are SNV's results:</div>
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<div class="gmail_default"><span class="gmail-il">Rocks</span> vs unmodified open fire</div>
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<div class="gmail_default">+30% Thermal efficiency</div>
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<div class="gmail_default">-27% Wood fuel used</div>
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<div class="gmail_default">-53% CO </div>
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<div class="gmail_default" style="font-size:small">
<div class="gmail_default">-57% PM </div>
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</blockquote>
<div class="gmail_default" style="font-size:small">
<div class="gmail_default"><span class="gmail-il">Clay</span> <span class="gmail-il">grate</span> vs unmodified open fire</div>
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<div class="gmail_default">+52% Thermal efficiency</div>
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<div class="gmail_default">-47% Wood fuel used </div>
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<div class="gmail_default">-57% CO </div>
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<div class="gmail_default">-58% PM </div>
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<div class="gmail_default" style="font-size:small">Early user feedback suggests that rocks in traditional charcoal cookstoves also improve efficiency. We are expanding our informal field testing and hope to test in the lab soon.</div>
<div class="gmail_default" style="font-size:small"><br class="">
</div>
<div class="gmail_default" style="font-size:small">Since rocks and broken clay bricks are free and ubiquitous, we only need to disseminate the idea, not a product. We are rapidly disseminating the idea with success in Kenya, Uganda and India by training women
group association leaders to train others who then train at the local level. In Kenya and Uganda we are working with the Catholic and Anglican Churches. In just a couple months and at low cost, we have trained tens of thousands of women to use this simple
modification. The trainers' feedback is that the users love it.</div>
<div class="gmail_default" style="font-size:small"><br class="">
</div>
<div class="gmail_default" style="font-size:small">Here is our occasionally-but-not-frequently-enough updated
<a href="https://nam05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.google.com%2Fdocument%2Fd%2F1ZryS7gQ1q3zKLZPM2KcXdtIHbOYQp4PbloPqMvrlZ5Y%2Fedit%3Fusp%3Dsharing&data=02%7C01%7C%7C39647a26ff924621097708d6c932d5b0%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636917617497792895&sdata=VD%2FiHyZlmTpggeXVKI2i96lE6%2FYjalfl%2F6bX%2BT7ORd0%3D&reserved=0" class="">
Cookstoves Overview</a>.</div>
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</div>
<div class="gmail_default" style="font-size:small">These cookstove modifications are a transitional first step but they are important.</div>
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<div class="gmail_default" style="font-size:small">All suggestions are welcome and appreciated.</div>
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<div class="">Kevin</div>
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<div dir="ltr" class=""><i class="">Kevin McLean, President</i></div>
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<div class=""><i class="">Sun24</i></div>
<div class=""><i class=""><a href="https://nam05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsun24.solar%2F&data=02%7C01%7C%7C39647a26ff924621097708d6c932d5b0%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636917617497802907&sdata=BhKuWGSogPLC6vJzVqc3CJ5vkQp%2FICnhJwPoBF%2BAKZs%3D&reserved=0" class="">https://sun24.solar</a>
<a href="https://nam05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.google.com%2Fdocument%2Fd%2F1ZryS7gQ1q3zKLZPM2KcXdtIHbOYQp4PbloPqMvrlZ5Y%2Fedit%3Fusp%3Dsharing&data=02%7C01%7C%7C39647a26ff924621097708d6c932d5b0%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636917617497822923&sdata=8Lj4zcfxkXdWbUJJpDn7oenMu5ylVMI5XAJQhQJxZ%2Bk%3D&reserved=0" class="">
Sun24 Cookstoves Overview</a><br class="">
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<div class=""><i class="">Tampa, Florida, USA</i></div>
<div class=""><i class=""><span class=""><span class=""><span class=""><a href="tel:+1(813)5053340">+1 (813) 505-3340</a></span></span></span></i></div>
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