<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div class=""></div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>I insert my thoughts below <b class="">in bold. I write here as I would in talking only to Kevin - but this seems like a good chance to get expert comments from our whole list. This is important data - because Kevin is developing something that is already saving a lot of wood. And no reason to think he has reached a limit. He is greatly fortunate to be getting this help from SNV (and I think at least some is being paid for only by Kevin!)</b><br class=""><div class=""><span style="font-family: Verdana; font-size: 9pt;" class=""><br class=""></span></div><div class=""><span style="font-size: 9pt;" class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>[SNV1: In the below tables and graphs below, the stoves performance parameters are presented in relation to
the performance of Iron bar only and the LPG stove, the least and most advanced options in the stove
stack of rural Vietnam.</span></div><div class=""><div class="page" title="Page 4"><div class="layoutArea"><div class="column"><p class=""><span style="font-size: 9.000000pt; font-family: 'Verdana'" class=""><span class="Apple-tab-span" style="white-space:pre"> </span><b class="">[RWL1: I was impressed by this IB (= Iron bar) pot support. Should be in the $1-$2 range. Looks highly worth it (over heat draining large rocks or bricks).</b></span></p><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span><b class="">One possible small addition would be some lower horizontal bars that might “mimic" the zero cost rocks under study. This assumes that the size of the rocks and the proposed horizontal “bars” have an optimum - and their small extra cost might have a quick payback. Rather than the IB’s rebar, which might have about a 1 cm diameter, these could be a factor of 10 lighter (and less costly)</b></div><div class=""><b class=""><br class=""></b></div><div class=""><b class=""><span class="Apple-tab-span" style="white-space:pre"> </span>I wonder if anyone has done a study of the best height of the IB. Looked OK - but probably can be optimized for different size pots and flames.</b></div><div class=""><b class=""><br class=""></b></div><div class=""><b class=""><span class="Apple-tab-span" style="white-space:pre"> </span>It was nice to see LPG in this table. Looks good/better - but we need to know the cost - which is likely many times more than the wood cost, especially if the wood is self-collected. Possible to get that LPG cost?</b></div><p class=""><span style="font-size: 9.000000pt; font-family: 'Verdana'" class=""> </span></p><p class=""><span style="font-size: 9.000000pt; font-family: 'Verdana'" class="">[SNV2: IB with a grate is superiour to the stone bed stove, but both signifantly save energy and emissions
compared to iron bar.
</span></p><p class=""><span class="Apple-tab-span" style="font-family: Verdana; font-size: 9pt; white-space: pre;"> </span><b class=""><font face="Verdana" class=""><span style="font-size: 9pt;" class="">[RWL2: This is a statement about cases A and B. Note that A</span>’s<span style="font-size: 9pt;" class=""> </span>“<span style="font-size: 9pt;" class="">grate</span>”<span style="font-size: 9pt;" class=""> is ceramic. So this says one might also prefer a ("costly</span>”<span style="font-size: 9pt;" class="">) grate over the free rocks.</span></font></b></p><div class=""><b class=""><span class="Apple-tab-span" style="white-space:pre"> </span>I’d like to see the data on emissions - which are not yet sent to Kevin.</b></div><div class=""><b class=""><br class=""></b></div><div class=""><b class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Why should the grate be better? </b></div><div class=""><b class=""><span class="Apple-tab-span" style="white-space:pre"> </span>You have to study the photos to see possible reasons. The rocks are pretty large.</b></div><div class=""><b class=""><span class="Apple-tab-span" style="white-space:pre"> </span>I can’t tell if this grate is supported from below by some small rocks (a later grate is). Could be that this grate operation could be improved (as the later metal grate of case C has given slightly better results)</b></div><div class=""><b class=""><br class=""></b></div><div class=""><b class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Statements about C and D are below.</b></div><div class=""><b class=""><br class=""></b></div><div class=""><b class=""><span class="Apple-tab-span" style="white-space:pre"> </span>The first table gives two test outputs for 6 variations. The next table gives 4 outputs as differences for the right hand 4. I think we are missing a little by showing differences. I hope to see more data from these 6 runs - since I find this so valuable. Of course it would be nice to have multiple runs, but this is a great start.</b></div><div class=""><br class=""></div><div class=""><br class=""></div>
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<table style="border-collapse: collapse" class=""><colgroup class=""><col style="width: 19.956237%" class=""><col style="width: 6.702902%" class=""><col style="width: 8.344025%" class=""><col style="width: 12.048087%" class=""><col style="width: 12.856566%" class=""><col style="width: 13.076261%" class=""><col style="width: 12.752651%" class=""><col style="width: 14.263271%" class="">
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<td style="border-style: solid; background-color: rgb(0.000000%, 69.000000%, 94.100000%); border-top-width: 0.479980pt; border-top-color: rgb(0.000000%, 0.000000%, 0.000000%); border-right-width: 0.600000pt; border-right-color: rgb(0.000000%, 0.000000%, 0.000000%); border-bottom-width: 0.480000pt; border-bottom-color: rgb(0.000000%, 0.000000%, 0.000000%); border-left-width: 0.600000pt; border-left-color: rgb(0.000000%, 0.000000%, 0.000000%)" class="">
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<div class="column"><p class=""><span style="font-size: 9.000000pt; font-family: 'Verdana'; font-weight: 700; color: rgb(100.000000%, 100.000000%, 100.000000%)" class="">Performance
Metric
</span></p><p class=""><span style="font-size: 9.000000pt; font-family: 'Verdana'; font-weight: 700; color: rgb(100.000000%, 100.000000%, 100.000000%)" class="">(Average from 3
tests)
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<td style="border-style: solid; background-color: rgb(0.000000%, 69.000000%, 94.100000%); border-top-width: 0.479980pt; border-top-color: rgb(0.000000%, 0.000000%, 0.000000%); border-right-width: 0.600000pt; border-right-color: rgb(0.000000%, 0.000000%, 0.000000%); border-bottom-width: 0.480000pt; border-bottom-color: rgb(0.000000%, 0.000000%, 0.000000%); border-left-width: 0.600000pt; border-left-color: rgb(0.000000%, 0.000000%, 0.000000%)" class="">
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<div class="column"><p class=""><span style="font-size: 9.000000pt; font-family: 'Verdana'; font-weight: 700; color: rgb(100.000000%, 100.000000%, 100.000000%)" class="">Unit
</span></p>
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<td style="border-style: solid; background-color: rgb(0.000000%, 69.000000%, 94.100000%); border-top-width: 0.479980pt; border-top-color: rgb(0.000000%, 0.000000%, 0.000000%); border-right-width: 0.480000pt; border-right-color: rgb(0.000000%, 0.000000%, 0.000000%); border-bottom-width: 0.480000pt; border-bottom-color: rgb(0.000000%, 0.000000%, 0.000000%); border-left-width: 0.600000pt; border-left-color: rgb(0.000000%, 0.000000%, 0.000000%)" class="">
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<div class="column"><p class=""><span style="font-size: 9.000000pt; font-family: 'Verdana'; font-weight: 700; color: rgb(100.000000%, 100.000000%, 100.000000%)" class="">Iron
bar
</span></p><p class=""><span style="font-size: 9.000000pt; font-family: 'Verdana'; font-weight: 700; color: rgb(100.000000%, 100.000000%, 100.000000%)" class="">(IB)
</span></p>
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<td style="border-style: solid; background-color: rgb(0.000000%, 69.000000%, 94.100000%); border-top-width: 0.479980pt; border-top-color: rgb(0.000000%, 0.000000%, 0.000000%); border-right-width: 0.480000pt; border-right-color: rgb(0.000000%, 0.000000%, 0.000000%); border-bottom-width: 0.480000pt; border-bottom-color: rgb(0.000000%, 0.000000%, 0.000000%); border-left-width: 0.480000pt; border-left-color: rgb(0.000000%, 0.000000%, 0.000000%)" class="">
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