<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div><blockquote type="cite" class=""><div class=""><font color="#000000" class="">Norbert et al</font></div></blockquote><div><br class=""></div><br class=""><blockquote type="cite" class=""><div class="">On Dec 18, 2017, at 3:57 PM, Norbert Senf <<a href="mailto:norbert.senf@gmail.com" class="">norbert.senf@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="gmail_extra"><div class="gmail_quote">On Mon, Dec 18, 2017 at 5:42 PM, Ronal W. Larson <span dir="ltr" class=""><<a href="mailto:rongretlarson@comcast.net" target="_blank" class="">rongretlarson@comcast.net</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word" class=""><div class="">Norbert et al, adding the stoves list.</div><div class=""><br class=""></div><div class=""><span class="m_-3792888316719488826Apple-tab-span" style="white-space:pre-wrap"> </span>See inserts.(snip)<span class=""><br class=""><blockquote type="cite" class=""><div class=""><div dir="ltr" class=""><div class="gmail_extra"><div class="gmail_quote"><div class=""><br class=""></div><div class="">I modified our own heater as an experiment, changing it over to the new Austrian eco-labelled air specification, and using airtight hardware to eliminate or reduce the use of the flue damper. Also as an experiment, I have been shutting the air early and harvesting the coals the next morning, putting them into an airtight ashbucket until they are cool. Burning roughly 7,000 lb of 20% moisture hardwood last winter, in 60 lb batches, I made roughly 500lbs or so of biochar. I have not heard of anyone else doing this yet.<br class=""></div></div></div></div></div></blockquote><span class="m_-3792888316719488826Apple-tab-span" style="white-space:pre-wrap"> </span></span><b class="">[RWL3: Not clear yet - is your approach safer?</b></div></div></blockquote><div class=""><br class=""></div><div class="">Yes. If I have an airtight stove, I can control the flow with the combustion air inlet and effectively stop the flow in the chimney. If the stove is not airtight, chimney draft will suck in "false air" through the leaks and bleed heat, thus lowering efficiency. The whole system is depressurized by the chimney, so no possibility of leakage into the room.<br class=""></div></div></div></div></div></blockquote><div><span class="Apple-tab-span" style="white-space:pre"> </span><b class="">[RWL: I sometimes hear of reverse flow in chimneys. Not to worry in your systems?</b></div><br class=""><blockquote type="cite" class=""><div class=""><div dir="ltr" class=""><div class="gmail_extra"><div class="gmail_quote"><div class=""> <br class=""></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word" class=""><div class=""><b class=""><span class="m_-3792888316719488826Apple-tab-span" style="white-space:pre-wrap"> </span>If optimized for char-making (and safety), instead of 500/7000 (roughly 10% in energy terms), might you have gotten up (energy terms) to 15 or 20%?<br class=""></b></div></div></blockquote><div class=""><br class=""></div><div class="">Good question. Makes sense that you could increase the yield through R&D. Would 20% be considered a high number for yield?</div></div></div></div></div></blockquote><div><span class="Apple-tab-span" style="white-space:pre"> </span><b class="">[RWL: No - medium . I almost never varied a percentage point from 25% by weight (multiply by about 30/18 to get energy). But we hear 30% by weight sometimes (low temperature char).</b></div><div><b class=""><br class=""></b></div><div><b class="">Ron</b></div><br class=""><blockquote type="cite" class=""><div class=""><div dir="ltr" class=""><div class="gmail_extra"><div class="gmail_quote"><br class=""></div>-- <br class=""><div class="gmail_signature" data-smartmail="gmail_signature">Norbert Senf<br class="">Masonry Stove Builders<br class="">25 Brouse Road, RR 5<br class="">Shawville Québec J0X 2Y0<br class="">819.647.5092<br class=""><a href="http://www.heatkit.com/" target="_blank" class="">www.heatkit.com</a></div>
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