<div dir="ltr">Dean,<div>I'm interested in how you would measure success. Lower particulates or temperature rise?</div><div>Where on the scale of combustion chambers are you now. The thermally worst being a cold water jacket that wicks all the heat away to the thermally best being perhaps a reflective cerafelt. </div><div><br></div><div>If you had a steady state radiant flame from a carbon containing fuel (something a TLUD is good for) and you swapped combustion chambers could you get points on graph? Would you then know if there a realistic gains to be made pursuing better combustion chambers? I've always thought that these basic questions could have answers with a controlled experimentation. </div><div><br></div><div>What is the excess air level in a Rocket stove? Is it safe to say that at 200% or 300% excess air the benefits of combustion chamber improvement will be small? </div><div><br></div><div>You have some of the tools to put bracketing numbers around this topic. </div><div><br></div><div>Alex</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Apr 26, 2015 at 10:54 AM, Bamboo Science Group <span dir="ltr"><<a href="mailto:greg@bamboosciencegroup.com" target="_blank">greg@bamboosciencegroup.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div><div style="color:rgba(0,0,0,0.701961);text-decoration:-webkit-letterpress">Dean et al, </div><div style="color:rgba(0,0,0,0.701961);text-decoration:-webkit-letterpress"><br></div><div style="color:rgba(0,0,0,0.701961);text-decoration:-webkit-letterpress">Great comments by Kirk and AJH,</div><div style="color:rgba(0,0,0,0.701961);text-decoration:-webkit-letterpress">I think the quick answer is yes. </div><div style="color:rgba(0,0,0,0.701961);text-decoration:-webkit-letterpress"><br></div><span style="color:rgba(0,0,0,0.701961);text-decoration:-webkit-letterpress">According to </span><span style="color:rgba(0,0,0,0.701961);text-decoration:-webkit-letterpress"><a href="http://Thermoworks.com" target="_blank">Thermoworks.com</a></span><span style="color:rgba(0,0,0,0.701961);text-decoration:-webkit-letterpress">, Carbon in the form of candle soot (inside of stove)</span><div style="color:rgba(0,0,0,0.701961);text-decoration:-webkit-letterpress">has an emissivity of 0.95 and polished aluminum ( outside of stove) is 0.05. So then in the "as used" conditions, this what you have. </div><div style="color:rgba(0,0,0,0.701961);text-decoration:-webkit-letterpress">So yeah black inner, shiny outer is a good first order design goal. </div><div style="color:rgba(0,0,0,0.701961);text-decoration:-webkit-letterpress"><br></div><div style="color:rgba(0,0,0,0.701961);text-decoration:-webkit-letterpress">As you well know, the conditions of stove use are dynamic, e.g. initial heating where the </div><div style="color:rgba(0,0,0,0.701961);text-decoration:-webkit-letterpress">Cp of the inner wall has to be overcome ( heat up) is different to the flame temp and swirl inducing inner wall surface dynamic requirements but in the first cut these are in the noise levels of consideration. </div>G</div><div><br>Sent from my iPad</div><div><div class="h5"><div><br>On Apr 26, 2015, at 8:10 AM, <a href="mailto:ajheggie@gmail.com" target="_blank">ajheggie@gmail.com</a> wrote:<br><br></div><blockquote type="cite"><div><span>[Default] On Sat, 25 Apr 2015 22:57:25 -0700,Dean Still</span><br><span><<a href="mailto:deankstill@gmail.com" target="_blank">deankstill@gmail.com</a>> wrote:</span><br><span></span><br><blockquote type="cite"><span>Hi G,</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>Just wondering if black on the inside of a metal combustion chamber and</span><br></blockquote><blockquote type="cite"><span>silver on the outside is a beneficial combination.</span><br></blockquote><span></span><br><span>Given that the re radiating of heat from the wall to the interior</span><br><span>depends on both emissivity and the 4th power of the absolute</span><br><span>temperature of the wall just insulating the wall will have a bigger</span><br><span>effect even if this means the emissivity is lower.</span><br><span></span><br><span>Downside is that in keeping the metal surface hotter you are probably</span><br><span>lessening its life.</span><br><span></span><br><span>AJH</span><br><span></span><br><span>_______________________________________________</span><br><span>Stoves mailing list</span><br><span></span><br><span>to Send a Message to the list, use the email address</span><br><span><a href="mailto:stoves@lists.bioenergylists.org" target="_blank">stoves@lists.bioenergylists.org</a></span><br><span></span><br><span>to UNSUBSCRIBE or Change your List Settings use the web page</span><br><span><a href="http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org" target="_blank">http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org</a></span><br><span></span><br><span>for more Biomass Cooking Stoves, News and Information see our web site:</span><br><span><a href="http://stoves.bioenergylists.org/" target="_blank">http://stoves.bioenergylists.org/</a></span><br><span></span><br></div></blockquote></div></div></div><br>_______________________________________________<br>
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