<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Paul, <div class=""><br class=""></div><div class="">Here my thoughts: I have several issues with this stove:</div><div class=""><br class=""></div><div class="">1) the fuel: it is using charcoal and not firewood. Of course charcoal has less particulate smoke emissions than firewood, but on the primary fuel use efficiency it is worse as you lose a lot of firewood (at least half of the primary energy) in the process of making the charcoal in the first place. </div><div class=""><br class=""></div><div class="">2) the capacity: I wonder for how many students they cater at that school, because I dont see this stove suitable for large pots beyond 20 litres capacity that you would expect a school would need. I have seen really large pots up to 600 (six hundred!) litres being used in schools in Uganda, so this stove here is a mere household size stove and not particularly useful for schools.<br class=""><div class=""><br class=""></div><div class="">3) the fuel savings: they are not spectacularly good but within the range of any well-designed and properly executed institutional firewood stove that should save between 66-80% of firewood compared to an open fire. So that is not the big selling point. </div><div class=""><br class=""></div><div class="">4) the cost: it seems very steep. For that budget Ken Steel Engineering in Malawi would probably supply you 50 firewood stoves including a matching 50-100 l stainless steel pot.</div><div class=""><br class=""></div><div class="">5) in line with the cost is the complication of the solar panels and batteries. I also don’t think that the place to store the battery next to the hot baking oven will do the lifespan of the battery any good. </div><div class=""><br class=""></div><div class="">Just my five cents</div><div class=""><br class=""><div class="">
<meta charset="UTF-8" class=""><div dir="auto" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div dir="auto" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div dir="auto" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">Christa Roth </div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><a href="mailto:stoves@foodandfuel.info" class="">stoves@foodandfuel.info</a></div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><br class=""></div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><br class=""></div></div></div><br class="Apple-interchange-newline"></div><br class="Apple-interchange-newline"></div><br class="Apple-interchange-newline"><br class="Apple-interchange-newline">
</div>
<div><br class=""><div class="">Am 27.11.2023 um 15:57 schrieb Paul Arveson <<a href="mailto:paularveson@gmail.com" class="">paularveson@gmail.com</a>>:</div><br class="Apple-interchange-newline"><div class="">
<meta http-equiv="content-type" content="text/html; charset=UTF-8" class="">
<div class=""><p class="">I received this from a friend and would appreciate your comments:<br class="">
</p><p class="">"<span style="mso-fareast-language:EN-US" lang="EN-US" class="">I received
the email below from a Rotary member in Ithaca New York. She
has put together an $11,620 project (attached) to pay for Vron
Engineering of Kampala, Uganda, to build four fuel-efficient
stoves at schools in Gulu, Uganda, enhanced with a PV-powered
fan to regulate the cooking temperature. Vron Engineering
claims their unit reduces firewood or charcoal use by 80%. <a href="https://www.youtube.com/watch?v=4SyWCc-EGis" class="moz-txt-link-freetext">https://www.youtube.com/watch?v=4SyWCc-EGis</a>.
The Rotary presentation is very professional, but my
unscientific mind is skeptical. I know that clean cookstoves
reduce firewood use, but it seems doubtful that adding a PV
panel, battery and fan would further reduce fuel use. And
without the PV panel, it seems excessive to spend $11,000 to
demonstrate that clean cookstoves (with stovepipes) actually
save fuel—something everyone already knows. Your thoughts?"</span></p><p class=""><span style="mso-fareast-language:EN-US" lang="EN-US" class="">Paul
Arveson<br class="">
</span></p>
</div>
_______________________________________________<br class="">Stoves mailing list<br class=""><br class="">to Send a Message to the list, use the email address<br class=""><a href="mailto:stoves@lists.bioenergylists.org" class="">stoves@lists.bioenergylists.org</a><br class=""><br class="">to UNSUBSCRIBE or Change your List Settings use the web page<br class="">http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org<br class=""><br class="">for more Biomass Cooking Stoves, News and Information see our web site:<br class="">http://stoves.bioenergylists.org/<br class=""><br class=""></div></div><br class=""></div></div></body></html>