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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>Dear Frank<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>Thanks. The burn room is a bit small (the stoves run up to 30 kW) but the instrument room is large. We often have a lot of visitors so 20 people can easily fit in the room to see the whiteboards.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>The stoves all have chimneys so a gas sample is drawn from the chimney. The temperature at the height at which the chimney exits the living space (the ‘heated envelope’) is recorded to calculate the thermal efficiency of the system as a whole.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>A hood can be used with small stoves (which are thought of as ‘picnic stoves’!) connected to the chimney which is what is done at the SeTAR Centre.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>There are several humming motors and the compressor and CO2 adsorber is not in the same room (noisy). You can see the diluter stuck into the lower end of the chimney. This is fed dry air that reduces the copious moisture level to something that will not condense. We don’t want to measure ‘fog’ as ‘particles’. The dilution is variable at the touch of a needle valve. The dilution is monitored by tracking the level of CO2 in the stack and diluter – a good suggestion made by Tami Bond some year ago. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>Last week we managed to measure smoke that reached 50 grams per cubic metre of air (undiluted), far beyond our previous record of 17. Fifty million micrograms is a heck of a snort for a lab to deal with. We are looking at ways to reduce the amount of moisture and volatile vapours in the while system. If we can get it out early, it makes everything last a heck of a lot longer.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>Regards<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'>Crispin<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p></div></body></html>