<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Crispin,</div><div><br></div><div>As for the biochar yield calculation, it is very simple.</div><div><br></div><div>I weight my reactor can empty, currently about 354 grams.</div><div><br></div><div>I weight the fuel, typically 500 grams for test runs to keep the time less than 50 minutes.</div><div><br></div><div>I weight the reactor at the end of the run = Gross weight</div><div><br></div><div>Then:</div><div><br></div><div>Gross weight at end of run minus reactor weight = amount of biochar in the reactor at end of run.</div><div><br></div><div>Lastly: Amount of Biochar in reactor / weight of fuel = % biochar yield.</div><div><br></div><div>It is interesting to watch the biochar yield vary with run time, which is also indicative of the heat generated by the system. IE: The shorter the run time, the faster the finite number of BTUs in the fuel are consumed, the faster the pyrolysis, thus the greater the heat and the less the charcoal yield.</div><div><br></div><div>Does this work for you?</div><div><br></div><div>Cheers,</div><div><br></div><div>Jock<br><br><div>Jock Gill</div><div>P.O. Box 3</div><div>Peacham, VT 05862</div><div><br></div><div>Cell: (617) 449-8111</div><div><br></div><div><span style="font-weight: bold; text-decoration: underline; background-color: rgba(255, 255, 255, 0);"><a href="http://google.com/+JockGill">google.com/+JockGill</a></span></div><div><br></div><div><span style="background-color: rgba(255, 255, 255, 0);">:> Extract CO2 from the atmosphere! <:</span></div><div><br></div>Via iPad</div><div><br>On Apr 9, 2014, at 1:24 AM, Crispin Pemberton-Pigott <<a href="mailto:crispinpigott@outlook.com">crispinpigott@outlook.com</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br name="BB10" caretmarkerset="INVALID" class="markedForCaretMarkerRemoval"></div> <div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br>Dear Jock</div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">What is the formula used to say the charcoal yield is 20%?</div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><br></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">Thanks</div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);">Crispin </div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><span style="font-size: initial; text-align: initial; line-height: initial;"><br name="BB10" caretmarkerset="INVALID" class="markedForCaretMarkerRemoval"></span></div><br><div id="_originalContent" style=""><meta http-equiv="content-type" content="text/html; charset=utf-8"><div>Today I added 9 more secondary air ports just above the first 29. The results were predictable:</div><div><br>1. Less draft on the already restricted primary made starting even trickier;</div><div><br></div><div>2. The red,orange hot carbon flame issue was clearly abated, if not fully eliminated - ie fewer moments of soot clearly being ejected.</div><div><br></div><div>3. Run time was slightly extended - ie pyrolysis was a bit slower;</div><div><br></div><div>4. Peak temperatures were lower which showed up as less thermal damage to the metal parts, esp, the central column in the burner.</div><div><br></div><div>5. Biochar yield went up slightly to about 20%. Nice stuff too.</div><div><br></div><div>Sometime in May I will try a reactor with about twenty five ½ inch holes in a single layer for secondary air.</div><div><br></div><div>That's it for now.</div><div><br></div><div>Thanks,</div><div><br></div><div>Jock</div><div><br name="BB10" caretmarkerset="INVALID" class="markedForCaretMarkerRemoval"></div><!--end of _originalContent --></div>
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