<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">Norbert and list:</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>1. Thanks for the historical review and comments.</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>2. I hope you can add a few more comments from the MHA and SNEWS perspectives on the relationship between top lighting and char-making. I know that you have yourself been making char in your own MH - and perceive that to be fairly unusual for your profession. Specifically, in the 1992 time period, was there anyone doing top lighting for char-making purposes? </div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>3. You wrote: "<i class="">At Toronto we talked with Tempcast, who told us that they
have abandoned their underfire air completely and are developing a new air
system based on top down burning."</i></div><div class=""><span class="Apple-tab-span" style="font-style: italic; white-space: pre;"> </span>On this list, top lighting always (??) refers to char-making first (emphasize first). Many of the commercial stoves like the Phillips and the Mimi Moto, adjust air flows when the pyrolysis front hits the bottom and then consume the char. We have been told that the Dutch developer of the Phillips regularly (?) did stop his own personal unit when the pyrolysis front reached the bottom - and did save the char.</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>My question on this sentence is whether we should call this operation more like a kon tiki - which has zero "underwire air". Can you say more about the Tempcast "<i class="">new air system". </i> I am suggesting here there may have been top-lighting but not up draft. And presumably Tempcraft was not interested in making char/</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>4. Also can you say something about the term <i class="">"contraflow" </i> in this sentence: <i class=""> "Elsewhere in this issue you'll find a report on some initial testing we did on
contraflow heaters at Jerry Frisch's new lab." </i>This sounds like it might have been a downdraft system. On this list we only hear from Gordon West and Bill Knauss with their continuous TLUD, in which the pyrolysis front is stationary, because the fuel is being continuously fed upwards. They are optimizing towards char production. Could your "contraflow" approach produce char?</div><div class=""><br class=""></div><div class="">Thanks again for this and other great contributions to this list.</div><div class=""><br class=""></div><div class="">Ron</div><div class=""><br class=""></div><div class=""><br class=""></div><br class=""><div><blockquote type="cite" class=""><div class="">On Jul 27, 2018, at 1:30 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="">Just to add a somewhat random historical data point on the TLUD discussion:</div><div class=""><br class=""></div><div class="">Masonry Heater Association first published an article on top ignition for updraft batch burns in masonry heaters in 1991.<br class=""></div><div class="">Here's my follow up article from 1992:<br class=""><a href="http://mha-net.org/docs/v8n2/docs/TOPDOWN.pdf" class="">http://mha-net.org/docs/v8n2/docs/TOPDOWN.pdf</a></div><div class=""><br class=""></div><div class="">It has become a mainstream ignition method for wood stoves and fireplaces since then. <br class=""></div></div>
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