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</o:shapelayout></xml><![endif]--></head><body bgcolor=white 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 Alex<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'>The average PM per MJ<sub>NET</sub> was 8 mg 14 minutes and 40 seconds after ignition. The pot was put on 4 minutes after 15 seconds after ignition. That means there was enough heat gained by the pot in 10 minutes and 25 seconds to bring the average in line with LPG.<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'>You are correct the LKPG would start cleaner.<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'>Because LPG composition is not ‘standard’ in any way, it helps to remember that a burner head may not be optimised to the fuel, even though it is gaseous. Because it is common to have the LPG flame touching the pot, it is not such a big surprise that the wood pellets burn cleaner, if the designer took care of that aspect.<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'>I recall from the Stove Testing Camp in July at your place, the burner you demonstrated was exceedingly clean. Was there a viable number from the PM machine? I do not recall that there was. If you know the EA value and the burn rate, and there is a raw concentration number, we could calculate it. I am interested to know if your burner is that clean.<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'>Regards<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 still mopping the floor in Accra<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='color:#1F497D'>+++++++++</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><p class=MsoNormal style='background:white'><span lang=EN-GB style='font-family:"Calibri",sans-serif;color:#1F497D'>The cold start is not ignored. The measurement goes from ignition to the completing of the cooking cycle. <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-GB style='font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-GB style='font-family:"Calibri",sans-serif;color:#1F497D'>Because there is hardly anything to measure, I caution again that such results are to be viewed skeptically until a special experiment can be conducted. <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-GB style='font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-GB style='font-family:"Calibri",sans-serif;color:#1F497D'>The ignition is the smokiest portion of the test so how the fuel is ignited comes to dominate the total emitted. Choosing a different kindling material will give a statistically different result. This is the case as well in Mongolia where the stoves are now so clean it has devolved into a fire lighting competition. Most of the stoves don't emit anything after they get going well. <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-GB style='font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-GB style='font-family:"Calibri",sans-serif;color:#1F497D'>Still, I take you point. If the LPG rate is 8 mg/MJ delivered, as was cited by an Indian delegate to the S4G conference a couple of weeks ago, then at some point the pellet stove will match it because almost all the PM is emitted by minute six. <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-GB style='font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-GB style='font-family:"Calibri",sans-serif;color:#1F497D'>I will have a look. <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-GB style='font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-GB style='font-family:"Calibri",sans-serif;color:#1F497D'>Regards <o:p></o:p></span></p></div><div><p class=MsoNormal style='background:white'><span lang=EN-GB style='font-family:"Calibri",sans-serif;color:#1F497D'>Crispin in Accra<o:p></o:p></span></p></div><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><div><div><p class=MsoNormal><span lang=EN-GB>Crispin, <o:p></o:p></span></p><div><p class=MsoNormal><span lang=EN-GB>So the cold start is ignored? Assuming that propane starts cleaner??, how long does the stove have to run before the total gross emissions, including the start-up, match those from the propane stove? <o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p></div><div><p class=MsoNormal><span lang=EN-GB>Alex<o:p></o:p></span></p></div></div><div><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p></div></div></div></body></html>