<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:Helvetica;
panose-1:2 11 6 4 2 2 2 2 2 4;}
@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal;
font-family:"Calibri",sans-serif;
color:windowtext;}
span.EmailStyle18
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>Dear Tony<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>Marvellous ideas and good opportunity to do creative experiments with students.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>What other fuels are available (please list biomass that is in suitable quantities).<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>Thanks<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>Crispin<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US>Dear Stoves experts I am looking for some advice and help from experts in the field on a specific project.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Cooking Stoves for a School<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Currently this international school in Indonesia is using Rocket style cookstoves with sawdust as fuel source. (and some used timber/bamboo)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Typical daily activity is to prepare food for up to 600 people, smaller breakfast, full on lunch.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>The stoves are used for all types of cooking, typically in large pots 20-40lt. There are up to 10 stoves running at any one time in a covered but not indoor area.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Most of the stoves are constructed from bricks with some metal gratings<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>The current cookstoves were a part of a previous environmentally focused student lead project.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>The key issues are: <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>The rocket stoves though not very labor intensive are normally not functioning even close to original designs in practice with variable output and quite often loss of the “rocket” during burn.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>The kitchen staff do not have a lot of time to devote to maintenance and operation, they need a stable and repeatable solution.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>The current stoves are not very efficient creating considerable smoke, attempts to add some forced air as both primary and secondary air have been largely unsuccessful (too complicated to control)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>This link shows some pictures of current setup:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#212121;background:white'><a href="https://goo.gl/photos/6PfARtHjAYwB66oo8">https://goo.gl/photos/6PfARtHjAYwB66oo8</a><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I have been following this list now for last 6 months or so and reviewing with interest many of the projects in particular the TLUD concepts and some of the innovative use of venturi from both air and water(steam) and am looking for some advice/ideas to move ahead with a better concept and direction for both the stoves and maybe the fuel in this application.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Key design points for up to 10 stoves:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Sawdust as fuel source<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Fast load and start<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>2-4 hours of efficient burn time (prefer continuous feed if practical for some units)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>20-40Liter Cook Pots or Wok of similar size.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Ability to adjust or divert heat as temperature control<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Simple maintenance and control, long stove life<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Control of effluent / exhaust in the work area – we are thinking in terms of chimneys or ducting. <o:p></o:p></span></p><p class=MsoNormal style='text-indent:36.0pt'><span lang=EN-US>Current stoves vent around the pot.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Fuel – is it worth to add steps (pelletizing?) to the fuel preparation<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Soft features:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Ability to use instrumentation and control for development of project and student training on the use of advanced cook stoves, on use of BioFuels for cooking and Biochar creation and to develop the best in class design for this kitchen.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Primary& Secondary air measurement and control<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Monitoring/Observing the burn real time (hard to see under the pot</span><span lang=EN-US style='font-family:Wingdings'>J</span><span lang=EN-US>)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Burn efficiency (thermal and chemical) monitoring/measurement and effluent testing, both gases and solid waste<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Overall energy efficiency – low / no use of external power (electricity) preferred but not a showstopper<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Longer term if project is successful simpler designs would be rolled out to neighboring school and community facilities as currently the sawdust is available as a local “waste” product. It is very likely that existing TLUD designs can fit the community needs but some convincing is needed for the local community.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I understand that this is a little away from the typical focus of this group but there is no doubt that at the moment Indonesia has a massive “burning” problem affecting health and well being of people and animals. We want to increase students knowledge and interest in the real opportunities that managed burning and Biochar creation could have over the current practices of open fires for both cooking and disposal of organic waste. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>For sure whatever we end up doing will be shared with this (stoves) community.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>We expect some or all of this project to be student lead or student involved.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Some key questions:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Is TLUD the recommended solution type for this application or is some other approach more suitable?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>How to maintain cooking efficiency but include exhaust duct/chimney in the design? <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>If continuous feed or in-situ reloading is not feasible is there some kind of quick change design that would allow cooking to resume with minimal downtime between burns?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Is there something that could be done with multiple stoves to simplify design (ducting?)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Are bricks and mortar a suitable building material or should the focus move to steel?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>How to efficiently “tune” a stove for efficiency – correct amounts of primary, secondary air. Previous local experiments are inconclusive as there have been far too many variables.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Is sawdust a suitable fuel?? or should it be compressed/pelletized for use??<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman",serif'>Tony Vovers <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman",serif'>+62 (813) 3888 9062</span><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>