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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'>Dear Friends<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>We have been conducting a series of thermal efficiency tests on three stoves, more than 50 altogether, and I am sharing a consistently good result from two of them. Here is one:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Thermal Efficiency<o:p></o:p></span></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=144 style='width:108.0pt;margin-left:-.75pt;border-collapse:collapse'><tr style='height:14.25pt'><td width=72 nowrap valign=bottom style='width:54.0pt;border:none;border-top:solid windowtext 1.0pt;background:#CCC0DA;padding:0mm 5.4pt 0mm 5.4pt;height:14.25pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>66.7%<o:p></o:p></span></p></td><td width=72 nowrap valign=bottom style='width:54.0pt;border-top:solid windowtext 1.0pt;border-left:none;border-bottom:none;border-right:solid windowtext 1.0pt;background:#CCC0DA;padding:0mm 5.4pt 0mm 5.4pt;height:14.25pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>67.1%<o:p></o:p></span></p></td></tr><tr style='height:14.25pt'><td width=72 nowrap valign=bottom style='width:54.0pt;background:#CCC0DA;padding:0mm 5.4pt 0mm 5.4pt;height:14.25pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>67.1%<o:p></o:p></span></p></td><td width=72 nowrap valign=bottom style='width:54.0pt;border:none;border-right:solid windowtext 1.0pt;background:#CCC0DA;padding:0mm 5.4pt 0mm 5.4pt;height:14.25pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p></td></tr><tr style='height:14.25pt'><td width=72 nowrap valign=bottom style='width:54.0pt;border:none;border-bottom:solid windowtext 1.0pt;background:#CCC0DA;padding:0mm 5.4pt 0mm 5.4pt;height:14.25pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>67.6%<o:p></o:p></span></p></td><td width=72 nowrap valign=bottom style='width:54.0pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;background:#CCC0DA;padding:0mm 5.4pt 0mm 5.4pt;height:14.25pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p></td></tr></table><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>That was achieved at about 2 kW power level.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The other was at a similar level:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Thermal efficiency<o:p></o:p></span></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=144 style='width:108.0pt;margin-left:-.75pt;border-collapse:collapse'><tr style='height:14.25pt'><td width=72 nowrap valign=bottom style='width:54.0pt;background:#CCC0DA;padding:0mm 5.4pt 0mm 5.4pt;height:14.25pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>73.0%<o:p></o:p></span></p></td><td width=72 nowrap valign=bottom style='width:54.0pt;background:#CCC0DA;padding:0mm 5.4pt 0mm 5.4pt;height:14.25pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>71.3%<o:p></o:p></span></p></td></tr><tr style='height:14.25pt'><td width=72 nowrap valign=bottom style='width:54.0pt;background:#CCC0DA;padding:0mm 5.4pt 0mm 5.4pt;height:14.25pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>70.8%<o:p></o:p></span></p></td><td width=72 nowrap valign=bottom style='width:54.0pt;background:#CCC0DA;padding:0mm 5.4pt 0mm 5.4pt;height:14.25pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p></td></tr><tr style='height:14.25pt'><td width=72 nowrap valign=bottom style='width:54.0pt;background:#CCC0DA;padding:0mm 5.4pt 0mm 5.4pt;height:14.25pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>69.9%<o:p></o:p></span></p></td><td width=72 nowrap valign=bottom style='width:54.0pt;background:#CCC0DA;padding:0mm 5.4pt 0mm 5.4pt;height:14.25pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p></td></tr></table><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I am pretty sure I have not seen this for a high power level before. Very low power can achieve high efficiencies but it is not a very useful heat. With these two we are seeing 1.4 kW absorbed into the pot. Pretty impressive.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I will ask permission to share the data for what will be 69 tests in all.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>One set involved repeating a test done in another country with a similar though not identical protocol. The result was within 2.3% so the approaches are getting comparable results. Given that the fuel was not identical, altitude difference and not exactly the same pot, the difference is negligible.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Other lab (recalculated to correct a minor error)<o:p></o:p></span></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=144 style='width:108.0pt;margin-left:-.75pt;border-collapse:collapse'><tr style='height:14.25pt'><td width=72 nowrap valign=bottom style='width:54.0pt;border-top:solid windowtext 1.0pt;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:none;background:#CCC0DA;padding:0mm 5.4pt 0mm 5.4pt;height:14.25pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>69.4%<o:p></o:p></span></p></td><td width=72 nowrap valign=bottom style='width:54.0pt;border:solid windowtext 1.0pt;border-left:none;background:#CCC0DA;padding:0mm 5.4pt 0mm 5.4pt;height:14.25pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>69.4%<o:p></o:p></span></p></td></tr></table><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>SeTAR Lab with a slightly smaller pot and 1.1 litres less water in it<o:p></o:p></span></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=144 style='width:108.0pt;margin-left:-.75pt;border-collapse:collapse'><tr style='height:14.25pt'><td width=72 nowrap valign=bottom style='width:54.0pt;border:none;border-top:solid windowtext 1.0pt;background:#CCC0DA;padding:0mm 5.4pt 0mm 5.4pt;height:14.25pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>66.7%<o:p></o:p></span></p></td><td width=72 nowrap valign=bottom style='width:54.0pt;border-top:solid windowtext 1.0pt;border-left:none;border-bottom:none;border-right:solid windowtext 1.0pt;background:#CCC0DA;padding:0mm 5.4pt 0mm 5.4pt;height:14.25pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>67.1%<o:p></o:p></span></p></td></tr><tr style='height:14.25pt'><td width=72 nowrap valign=bottom style='width:54.0pt;background:#CCC0DA;padding:0mm 5.4pt 0mm 5.4pt;height:14.25pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>67.1%<o:p></o:p></span></p></td><td width=72 nowrap valign=bottom style='width:54.0pt;border:none;border-right:solid windowtext 1.0pt;background:#CCC0DA;padding:0mm 5.4pt 0mm 5.4pt;height:14.25pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p></td></tr><tr style='height:14.25pt'><td width=72 nowrap valign=bottom style='width:54.0pt;border:none;border-bottom:solid windowtext 1.0pt;background:#CCC0DA;padding:0mm 5.4pt 0mm 5.4pt;height:14.25pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'>67.6%<o:p></o:p></span></p></td><td width=72 nowrap valign=bottom style='width:54.0pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;background:#CCC0DA;padding:0mm 5.4pt 0mm 5.4pt;height:14.25pt'><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:black'> <o:p></o:p></span></p></td></tr></table><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>It is nice to see this performance level achieved consistently. We are seeing a consistent performance variation with pot diameter: bigger is better.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Regards<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Crispin<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p></div></body></html>