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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoPlainText>Dear Friends<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>> Other technology packages and published papers of the Sida project can be<o:p></o:p></p><p class=MsoPlainText>> downloaded from <a href="http://www.retsasia.ait.ac.th"><span style='color:windowtext;text-decoration:none'>www.retsasia.ait.ac.th</span></a>. The biomass/stove group may be<o:p></o:p></p><p class=MsoPlainText>> interested the package on drying, which includes a hybrid drier using solar<o:p></o:p></p><p class=MsoPlainText>> energy and bioenergy from a gasifier stove, heat output of which could be<o:p></o:p></p><p class=MsoPlainText>> automatically controlled by using a thermostat.<o:p></o:p></p><p class=MsoPlainText><span style='color:black'><o:p> </o:p></span></p><p class=MsoPlainText><span style='color:black'>The device in the article was shown (in a slightly earlier version I think) and it is a downdraft gasifier that can be refuelled and emptied while running. The gas is led to the 'neck' section which has a perforated tube allowing in secondary air. This heat reaches first one pot then the second. Both are basically enclosed completely for efficient heat transfer.<o:p></o:p></span></p><p class=MsoPlainText><span style='color:black'><o:p> </o:p></span></p><p class=MsoPlainText><span style='color:black'>I sampled the gases at the end with a combustion analyser and found the excess air was quite high. The reason for this was the large number of holes letting in the air. It is recommended that if you build one of these, make a provision for controlling the secondary entry to you can tune the EA to limit it. The limit point is that at which the CO</span><span style='color:black'>/</span><span style='color:black'>CO<sub>2</sub> ratio starts to exceed your target figure (anything under 2%, normally).<o:p></o:p></span></p><p class=MsoPlainText><span style='color:black'><o:p> </o:p></span></p><p class=MsoPlainText><span style='color:black'>The power of the unit is high. It radiates a lot of heat and cooks 2 large pots.<o:p></o:p></span></p><p class=MsoPlainText><span style='color:black'><o:p> </o:p></span></p><p class=MsoPlainText><span style='color:black'>Regards<o:p></o:p></span></p><p class=MsoPlainText><span style='color:black'>Crispin<o:p></o:p></span></p><p class=MsoPlainText><span style='color:black'><o:p> </o:p></span></p></div></body></html>