<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div><div style="color: rgba(0, 0, 0, 0.701961); -webkit-composition-fill-color: rgba(130, 98, 83, 0.0980392); text-decoration: -webkit-letterpress;">Dean et al, </div><div style="color: rgba(0, 0, 0, 0.701961); -webkit-composition-fill-color: rgba(130, 98, 83, 0.0980392); text-decoration: -webkit-letterpress;"><br></div><div style="color: rgba(0, 0, 0, 0.701961); -webkit-composition-fill-color: rgba(130, 98, 83, 0.0980392); text-decoration: -webkit-letterpress;">Great comments by Kirk and AJH,</div><div style="color: rgba(0, 0, 0, 0.701961); -webkit-composition-fill-color: rgba(130, 98, 83, 0.0980392); text-decoration: -webkit-letterpress;">I think the quick answer is yes. </div><div style="color: rgba(0, 0, 0, 0.701961); -webkit-composition-fill-color: rgba(130, 98, 83, 0.0980392); text-decoration: -webkit-letterpress;"><br></div><span style="color: rgba(0, 0, 0, 0.701961); -webkit-composition-fill-color: rgba(130, 98, 83, 0.0980392); text-decoration: -webkit-letterpress;">According to </span><span style="color: rgba(0, 0, 0, 0.701961); -webkit-composition-fill-color: rgba(130, 98, 83, 0.0980392); text-decoration: -webkit-letterpress;"><a href="http://Thermoworks.com">Thermoworks.com</a></span><span style="color: rgba(0, 0, 0, 0.701961); -webkit-composition-fill-color: rgba(130, 98, 83, 0.0980392); text-decoration: -webkit-letterpress;">, Carbon in the form of candle soot (inside of stove)</span><div style="color: rgba(0, 0, 0, 0.701961); -webkit-composition-fill-color: rgba(130, 98, 83, 0.0980392); 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); -webkit-composition-fill-color: rgba(130, 98, 83, 0.0980392); 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); -webkit-composition-fill-color: rgba(130, 98, 83, 0.0980392); text-decoration: -webkit-letterpress;"><br></div><div style="color: rgba(0, 0, 0, 0.701961); -webkit-composition-fill-color: rgba(130, 98, 83, 0.0980392); 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); -webkit-composition-fill-color: rgba(130, 98, 83, 0.0980392); 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><br>On Apr 26, 2015, at 8:10 AM, <a href="mailto:ajheggie@gmail.com">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">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">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">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/">http://stoves.bioenergylists.org/</a></span><br><span></span><br></div></blockquote></body></html>