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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-CA link="#0563C1" vlink="#954F72"><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 Kirk<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'>></span><span style='font-size:10.0pt;font-family:"Arial",sans-serif'> With the support of Aprovecho Research Center, I (actually we) have developed a very good, clean burning TLUD-ND. <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 think you have done exactly that. Good on you.<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'>There is no misdirection at all here. You are past the verge of changing the stove’s superior performance in order to get a better rating on an invalid metric. It is that simple. Don’t get sucked into that trap. When you are getting results as good as you are, there are new opportunities to go wrong. <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 only ‘misdirection’ has been supplied for years by test methods that guided people to edit their stoves to meet spurious requirements that did not bear directly on performance, or worse, actually penalised stoves for their superior performance. A good example is attached.<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'>This is not something new in the stove community. Here is a quote from the attached Aprovecho document from 2003:<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><i><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>“Why was the good advice, by established experts in the field, represented in the VITA International Standard test, the result of several well funded international conferences, obscure in 2003? Both the Indian and Chinese governments developed tests of their own widening the scope of PHU to include power, rate of evaporation, time. Visser (2003) published a version of a water boiling test based on efficiency and appropriate power for boiling and simmering. What motivated this parallel activity? Why isn’t the VITA test in more general use?”<o:p></o:p></span></i></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'>One reason the VITA test was not more popular was it had several conceptual errors and a few really poor metrics that gave mis-directing outputs. One is the efficiency of simmering, another is the concept of specific fuel consumption for simmering. Another was the idea of an ‘average efficiency’ meaning an ‘average thermal efficiency’. I believe from my research that the specific fuel consumption for simmering and the average efficiency were both introduced by Baldwin in 1986 or so, before his book came out. Neither are acceptable metrics.<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 document refers to the VITA test the ‘international standard’ which is not supported by the evidence. Three or four minor parties agreed to it and it was never used by the major markets in India and China. Even Eindhoven University didn’t use it and they were a party to drafting it. India pretty much adopted the minority position taken by KK Prasad from Eindhoven and built that into their 1991 test. The Chinese test from that era was very similar. India, interestingly, produced a list of 28 standard sizes of cooking pot which is a record, I believe!<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 long-forgotten organisation Bois de Feu had a clear understanding of these issues and had a test method in 1982 that didn’t have these problems. They treated the simmering phase very carefully (and differently). Prasad (and Visser who was his student) developed multiple test methods over the years. Piet Visser and I created one in Malawi in about 2007 which later evolved into the ProBEC Test for heat transfer efficiency which is now a SeTAR SOP, currently v1.05 (SeTAR is an independently managed continuation of the 13 year long GIZ/ProBEC project). It doesn’t really predict performance, it gives a real-time heat transfer efficiency report under varying conditions. It is very easy to perform and it supports pot-swapping, similar to the Indian protocol.<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'>So, ladies and gentlemen, there are no Tier 4 stoves. That achievement will have to wait for the development of appropriate, valid low power metrics and one will need an equipment set capable of quantifying the result.<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'>Kirk: don’t be bamboozled. You are doing good work. Nothing is perfectly correct. Independent investigation of truth is still required.<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'>Best wishes<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<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'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>All,</span><o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>With the support of Aprovecho Research Center, I (actually we) have developed a very good, clean burning TLUD-ND. This is real and proven and no amount of misdirection can change that. It will be at Aprovecho for stove camp for all to examine, and I will be giving a presentation on how it burns so clean.</span><o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>Respectfully,</span><o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>Kirk</span><o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>Santa Rosa, CA. USA</span><o:p></o:p></p></div></div></body></html>