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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>Dear Marc<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>Looking at your wood fuel temperature profile:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><img width=453 height=266 id="Picture_x0020_1" src="cid:image003.jpg@01D03EF6.62A398F0"><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>It seems that you could turn down the primary air a bit to get a lower temperature for a bit longer (or with less fuel. The bump marked ‘transition’ is really dictated by the way the air flow changed.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>Did you make that transition manually? <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>If it was manual you could I suppose mage made is a little sooner to avoid the 100 deg drop in temperature. There is a simple way to have it transition automatically which is to place some holes that will give additional primary air to gasify the char. These should be near the bottom but no right at the bottom. Cover the holes with a strip of paper. As the pyrolysis zone passes the hole, it will burn the paper and open the holes.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>By experimenting with the holes’ number, size and vertical position (they don’t all have to be at the same height) you can get the automatic transition you want at an extremely low cost. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>Regarding the emissions, it is very likely that most of the ‘things you don’t want’ are produced during ignition. You could vent that smoke away from the oven then kick something over to the oven when it is burning well. That assumes you have a really clean burn which is certainly possible.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>Nice report. Thanks<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>Crispin<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><div><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri",sans-serif;color:#1F497D'>Marc's paper is a little too [large to] send through the list, you can download a copy here:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri",sans-serif;color:#1F497D'><a href="http://bit.ly/16mhgap">http://bit.ly/16mhgap</a><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri",sans-serif;color:#1F497D'>(Erin ) <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri",sans-serif;color:#1F497D'>------------------------------------------<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri",sans-serif'>Hi stovers & oveners!<o:p></o:p></span></p><div><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><div><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri",sans-serif'>I'd like to share with all of you the new update of the TLUD-Oven paper. It was somehow presented by Jon and Flip Anderson in the ETHOS and summarizes the work done since know by me in the TLUD-Ovens.<span style='color:#1F497D'><o:p></o:p></span></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri",sans-serif'>After preparing this paper, I have become more and more aware and worried about the concentration of toxic combustion products that can be produced and "stored" in a black oven like these and attach to food. Hopefully, these days some emissions measurements are being done in the Aprovecho lab, so more data is expected to come soon. I'll wait until knowing them before starting a discussion topic about it.<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri",sans-serif'>Marc<o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri",sans-serif'><a href="http://www.cuinessolars.jimdo.com">www.cuinessolars.jimdo.com</a><o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri",sans-serif'><o:p> </o:p></span></p></div></div></div></div></body></html>