<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Sarbagya:<div><br></div><div> Can you narrow down the type of stoves you are looking at? And why? </div><div><br></div><div> You seem to be talking of TLUDs, and when mentioning consuming char is that in a TLUD?</div><div><br></div><div> We have seen some nice designs with secondary being preheated with a central pipe, not the exterior gap you describe.</div><div><br></div><div> At least one stove developer (Kirk Harris) has argued for using that exterior space for added insulation. A topic fairly easy to compare in the lab you appear to have available.</div><div><br></div><div>Ron</div><div><br><div><div>On Aug 20, 2013, at 6:44 AM, Sarbagya R. Tuladhar <<a href="mailto:sarbagya007@gmail.com">sarbagya007@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi stovers,<div><br></div><div>The debate on the role of secondary air both for natural draft and forced draft has been raging for quite some time now. Obtaining secondary air in pre-heated form has been the research area for me in the laboratory for the past few weeks. However, one conclusion I obtained was that secondary air if not pre-heated would have the tendency to put off the fire by blowing in cold air. </div><div><br></div><div>Hence my question is:</div><div><br></div><div>What is the role of secondary air for wood burning stoves ? Is there an optimum gap for the secondary air to travel between the jackets of the combustion chamber before ejecting out into the combustion chamber ? How does this effect the performance of the cookstove ? I know a few cookstoves which have secondary air concept included and which seemed to decrease the CO and PM up to some extent. </div><div><br></div><div>What is the role of secondary air for charcoal burning stoves ? Quoting Crispin "<span class="Apple-style-span" style="color: rgb(68, 68, 68); font-family: Calibri; font-size: 16px; line-height: 22px; ">Secondary air is necessary to burn charcoal in a low O2 environment at a high temperature." How does this effect the performance of the charcoal cookstove?</span></div><div><span class="Apple-style-span" style="color: rgb(68, 68, 68); font-family: Calibri; font-size: 16px; line-height: 22px; "><br></span></div><div><span class="Apple-style-span" style="color: rgb(68, 68, 68); font-family: Calibri; font-size: 16px; line-height: 22px; ">Waiting for the responses.</span></div><div><span class="Apple-style-span" style="color: rgb(68, 68, 68); font-family: Calibri; font-size: 16px; line-height: 22px; "><br></span></div><div><span class="Apple-style-span" style="color: rgb(68, 68, 68); font-family: Calibri; font-size: 16px; line-height: 22px; ">Cheers</span></div><div><span class="Apple-style-span" style="color: rgb(68, 68, 68); font-family: Calibri; font-size: 16px; line-height: 22px; "><br></span></div><div><span class="Apple-style-span" style="color: rgb(68, 68, 68); font-family: Calibri; font-size: 16px; line-height: 22px; ">Sarbagya Tuladhar</span></div><div><span class="Apple-style-span" style="color: rgb(68, 68, 68); font-family: Calibri; font-size: 16px; line-height: 22px; ">Pondicherry, INDIA</span></div></div>_______________________________________________<br>Stoves mailing list<br><br>to Send a Message to the list, use the email address<br><a href="mailto:stoves@lists.bioenergylists.org">stoves@lists.bioenergylists.org</a><br><br>to UNSUBSCRIBE or Change your List Settings use the web page<br>http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org<br><br>for more Biomass Cooking Stoves, News and Information see our web site:<br>http://stoves.bioenergylists.org/<br><br></blockquote></div><br></div></body></html>