<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Similar Gasifiers get 15%-20% yields. I would question 25% or more. <br><br><div id="AppleMailSignature">T R Miles Technical Consultants Inc.<div><span class="Apple-style-span" style="-webkit-tap-highlight-color: rgba(26, 26, 26, 0.296875); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469); "></span><div><span class="Apple-style-span" style="-webkit-tap-highlight-color: rgba(26, 26, 26, 0.296875); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469); "><a href="mailto:tmiles@trmiles.com">tmiles@trmiles.com</a></span></div><div><span class="Apple-style-span" style="-webkit-tap-highlight-color: rgba(26, 26, 26, 0.292969); -webkit-composition-fill-color: rgba(175, 192, 227, 0.226562); -webkit-composition-frame-color: rgba(77, 128, 180, 0.226562);">Sent from mobile. </span></div></div></div><div><br>On Dec 18, 2017, at 6:50 PM, Norbert Senf <<a href="mailto:norbert.senf@gmail.com">norbert.senf@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Mon, Dec 18, 2017 at 6:22 PM, Ronal W. Larson <span dir="ltr"><<a href="mailto:rongretlarson@comcast.net" target="_blank">rongretlarson@comcast.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><div><span class=""></span><div><span class="m_-8389741761103720626Apple-tab-span" style="white-space:pre-wrap"> </span><b>[RWL: I sometimes hear of reverse flow in chimneys. Not to worry in your systems?</b></div></div></div></blockquote><div><br></div><div>It can be an issue with cold starts, but is not a safety concern because there will be noxious smoke, which is obvious. There are various workarounds/fixes for this<br></div><div>In normal operation, the heater is warm, and will keep powering the chimney draft long after the fire is out until all the heat is sucked out of the mass.<br></div><div>During the charcoal phase, when the thermal mass has been heated, chimney draft is never an issue.<br><br></div><div>This is quite the opposite of "airtight" stoves that you fill with wood and then turn down for an overnight burn. During the middle-of-the-night charcoal phase, draft can get low and house depressurization can cause a reversal and CO spillage. <br></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"><div><br><div><span class="m_-8389741761103720626Apple-tab-span" style="white-space:pre-wrap"> </span><b>[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></div></blockquote><div><br></div><div>Thanks, interesting to know what a good number for yield would be ...............N<br clear="all"></div></div><br>-- <br><div class="gmail_signature" data-smartmail="gmail_signature">Norbert Senf<br>Masonry Stove Builders<br>25 Brouse Road, RR 5<br>Shawville Québec J0X 2Y0<br>819.647.5092<br><a href="http://www.heatkit.com" target="_blank">www.heatkit.com</a></div>
</div></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>