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Crispin,<br>
<br>
That is the small stove that you showed me (and ignited) in Ghana.
Congratulations. Of course I am always delighted to read favorable
reports of TLUD stoves. <br>
<br>
But I have some questions and issues:<br>
<br>
1. This is an extremely slow burning stove. Consistent, yes.
But it lacks fire power. And it should therefore be compared with
other small stoves.<br>
<br>
2. I am concerned about the comment<br>
<blockquote type="cite">ignoring the first 16 minutes during which
the fire was getting established. </blockquote>
That delay alone could mean rejection of the stove by users or in
testing situations.<br>
<br>
3. More details are requested: <br>
Size of pot (especially the diameter of the bottom), <br>
Amount of water in the pot, <br>
Lid on pot? <br>
Temperature of the water at key times to show the rise in
temperature and the maintaining of boiling (or within 6 deg C of
local boiling temperature). Small stoves are not designed to boil
5 liters, so 5 L is unfair to such stoves with low power.<br>
<br>
4. 57% cooking efficiency (capture of the heat) is wonderful.
But <i><u><b>IF </b></u></i>it is only able to keep a baby's
bottle of milk warm for over 80 minutes, the usefulness needs clear
statements when describing the stove. On this Stoves Listserv we
are accustomed to "standard size stoves for a typical meal" and the
use of 5 liters of water in the pot, so we run the risk of equating
stoves that are really in very different categories by size. So
please provide the requested details so that we can all
appropriately appreciate the stated results.<br>
<br>
5. On the same note, but at the other extreme, the institutional
stove by InStove (60 liter capacity pot, I believe) was proclaimed
several times at the Ghana GACC Forum about its attainment of Tier 4
status. That is great!!! But all should know that using larger
pots and more water do greatly impact the results of stove
testing. As Dean Still said in his Saturday night keynote
presentation at ETHOS 2015, he accomplished some Tier 4 ratings by
shifting to a pot with 9 liters instead of 5 L. He did acknowledge
that he had gamed the system but was within the rules, so it was not
cheating. After ETHOS while at Aprovecho's Open House, Sam Bentson
(co-author with Dean) and I and others discussed several ways of how
to game (distort) the testing system. But the promised summary of
such methods was not prepared (or at least not released). Maybe it
will eventually be presented. <br>
<br>
This is all part of the wonderful world of stoves. I am observing,
not condemning nor congratulating. Personally, I find all of this
to be both exciting and frustrating.<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 11/30/2015 9:11 AM, Crispin
Pemberton-Pigott wrote:<br>
</div>
<blockquote
cite="mid:COL401-EAS5152D018F5EC7C360239E24B1000@phx.gbl"
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<p class="MsoNormal">Dear Friends<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I reported recently a small stove that was
very clean-burning and I was able to run a simple test on it a
few days ago.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Attached is the performance in terms of
mass loss, nominal firepower and average cooking power.<span
style="font-family:"helvetica
neue",serif;color:black;mso-fareast-language:EN-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The cooking power was calculated from the
average thermal efficiency, ignoring the first 16 minutes
during which the fire was getting established. The cooking
efficiency was 56.9% averaged over 83 minutes.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Pretty impressive.<o:p></o:p></p>
<p class="MsoNormal">Crispin<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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