<html><head></head><body bgcolor="#FFFFFF"><div><br>Crispin and list</div><div><br></div><div> Sure, adding carbon weights and ratios is fine. As near as I can tell this is already hidden in the 4.2 series from GACC.</div><div><br></div><div> Note there is a 4.2.2 that is a few weeks old.</div><div><br></div><div> But I think char energy and energy ratios are also informative. Why not them too? Also already hidden in the outputs, and being used to report the key conversion efficiency value.</div><div><br></div><div>Ron<br><br></div><div><br>On May 4, 2013, at 6:26 PM, "Crispin Pemberton-Pigott" <<a href="mailto:crispinpigott@gmail.com">crispinpigott@gmail.com</a>> wrote:<br><br></div><div></div><blockquote type="cite"><div><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><meta name="Generator" content="Microsoft Word 15 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--><div class="WordSection1"><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Dear Ron and All Char Retainers<o:p></o:p></span></p><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Would any of you agree with the following method of determining, but the most direct possible mathematical route, the ‘char producing efficiency’ of an appliance as follows:<o:p></o:p></span></p><p class="MsoNormal"><span style="mso-fareast-language:EN-US">Fraction carbon in the char remaining divided by Fraction of carbon in the original dry fuel, expressed as a percentage<o:p></o:p></span></p><p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">This captures the original carbon % of the raw fuel on a dry basis, and the same value for the char remaining (on average of course).<o:p></o:p></span></p><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Dividing one by the other gives the % of carbon that was in the original fuel retained in the char remaining.<o:p></o:p></span></p><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Would you accept this as a realistic measure of the char production? I will consider offering it to the Standards Committee to be included in the document. Maybe they will like it. It adds cost to testing but it might not be much.<o:p></o:p></span></p><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">It does not address the temperature at which it was processed, but that might be very difficult to assess without looking at the chemical structure for telltale signs.<o:p></o:p></span></p><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Regards<o:p></o:p></span></p><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Crispin<o:p></o:p></span></p><p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p></div></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>Stoves mailing list</span><br><span></span><br><span>to Send a Message to the list, use the email address</span><br><span><a href="mailto:stoves@lists.bioenergylists.org">stoves@lists.bioenergylists.org</a></span><br><span></span><br><span>to UNSUBSCRIBE or Change your List Settings use the web page</span><br><span><a href="http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org">http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org</a></span><br><span></span><br><span>for more Biomass Cooking Stoves, News and Information see our web site:</span><br><span><a href="http://stoves.bioenergylists.org/">http://stoves.bioenergylists.org/</a></span><br><span></span><br></div></blockquote></body></html>