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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Dear Friends<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Vinny at the SeTAR Centre is researching various aeration settings for a wood burning perforated bucket known locally as an mbaula (a modification of the word ‘barrel’). He sent me a few tests to look over.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>A quick calculation shows it boiled 5 litres of water in 10.5 minutes with a CO/CO<sub>2</sub> average of 1.9% burning (adjusted to 80 degrees ÄT) 126 g/litre, emitting 2.7 g of CO per litre boiled (1.32 g CO/MJ).<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Not bad for a paint can with some pickaxe holes in it and a hand woven wire grate at the centre line.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>In spite of the raging fire (12 kW peak) it was 20% efficient, peaking at 34% as the power ramped up. I wonder what will happen if they put a skirt around it, or run it at a reasonable power level. It looks like they got maximum efficiency at 6 kW.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Well done Vinny!<o:p></o:p></p><p class=MsoNormal>Crispin<o:p></o:p></p></div></body></html>