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Kirk,<br>
<br>
GREAT work you are doing, and it is especially nice to receive your
report (the only way that we can appreciate what you are doing). <br>
<br>
So good the Aprovecho is supportive of your efforts.<br>
<br>
I do not have a clear understanding of your "wick". Impression is
that it looks like another stationary fan. Maybe a sketch or
more photos could clarify it.<br>
<br>
I hope to see you this coming summer, probably at Apro.<br>
<br>
Paul<br>
<pre class="moz-signature" cols="72">Doc / Dr TLUD / Prof. Paul S. Anderson, PhD
Email: <a class="moz-txt-link-abbreviated" href="mailto:psanders@ilstu.edu">psanders@ilstu.edu</a>
Skype: paultlud Phone: +1-309-452-7072
Website: <a class="moz-txt-link-abbreviated" href="http://www.drtlud.com">www.drtlud.com</a></pre>
<div class="moz-cite-prefix">On 4/11/2016 3:16 PM, kgharris wrote:<br>
</div>
<blockquote cite="mid:AE7F36C3DCE74FE39E07B82A9DB0425F@phyllisPC"
type="cite">
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<div><font size="2" face="Arial">All,</font></div>
<div> </div>
<div><font size="2" face="Arial">I have just spent 2 1/2 weeks at
Aprovecho Wood S</font><font size="2" face="Arial">tove
Research Center in Oregon. Dean Still set for me the lofty
goal of developing a TLUD-ND which is tier 4 in all
catigories. We probably missed this goal, but we did make
progress. We have a test TLUD-ND which can boil a 5L pot of
water in around 20 minutes, and then turn down and simmer it
between the required test temperatures of 93C and 98C. At one
point the water was in danger of droping below 93C, and the
flame had to be turned up, so we also have some extra
turn-down. Additionally, the PM and CO levels were very low
at all power levels for most of the time. One exception was
one test where the CO remained slightly high at low power.
The fire was below the wick (see attachment) and was burning
char, creating an excess of CO. We had the usual increases at
the start up and flame out, and also small momentary increases
in both PM and CO during the transition from high to low power
levels. </font></div>
<div> </div>
<div><font size="2" face="Arial">The turn-down method we used is a
further development of the pilot flame method I discussed a
couple of years ago on the list. It now includes what I call
a wick, a central disk with radial slits, attached to the
combustor section. It works with the pilot flames to stablize
the low power flame. The method requires only that the
primary air be turned down, which makes it simple to make and
use. The control device has to be very sensitive at the low
end since a small change makes a big difference in the low
power flame. Another problem we encountered was creosote
which formed on the interior of the fuel/reaction chamber wall
(see attachment). Burning the char for a minute or two after
flame out cleared this deposit. Insulating the wall may
keep it hot enough that the creosote will not deposit.</font></div>
<div> </div>
<div><font size="2" face="Arial">This improving of the pilot flame
turn-down technique would not have been possible without the
equipment at Aprovecho. The real time sensing and computer
graphing equipment enabled us to quickly see the effects of
any changes we made. At one point, when the stove was
unstable and could not reach low power, I tried removing the
stationary fan which swirls the high power flame thinking it
might be causing a problem. The stove was then able to reach
the low power levels. I made a small change in the bend of
the fan blades to allow more opening between the blades, put
it back into the stove, and the low power flame remained
stable. We now had both clean high power because of the
swirl, and clean low power. The low power flame needed a more
open stove with less flow resistance than the high power
flame. This is counter intuitive at first, but makes sense
because the high power flame has more buoyant force (draft)
pushing the flame through the fan. I would not have found this
without Aprovecho's real time readout equipment.</font></div>
<div> </div>
<div>
<p style="MARGIN: 0in 0in 10pt" class="MsoNormal"><span
style="LINE-HEIGHT: 115%; FONT-SIZE: 14pt"><font
face="Arial">I hope to work at Aprovecho Research Center
in the future and I encourage others who are interested in
wood stove research to work at ARC or a similarly equipted
lab. The equipment very much helps with stove
experimenting and designing!</font></span></p>
</div>
<div><font size="2" face="Arial">Kirk</font></div>
<div><font size="2" face="Arial">Santa Rosa, CA. USA</font></div>
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<br>
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