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Crispin,<br>
<br>
Subject line changed because this topic merit further, on goind
discussion (and is about holes, not about Bangladesh).<br>
<br>
Your comments below are totally correct and raise important
questions. I focus here on the second one, about the side holes.<br>
<br>
You point out the multitude of side holes in the Prime stoves
(designed by Prof. Nurhuda and sold by Prime, led by Jorund Buen).
And that the Vest has three. Paal Wendelbo's Peko Pe has several.
Anderson's Champion TLUD (and derivatives in Uganda by Awamu) has
none. Paul Wever's large tall TLUDs (Chip Energy, Stove-pipe
stoves) have a few. And Kirk Harris also deals with the "pilot
light" topic to sustain the flame. And we can add more to this
list, even to note those that do not have any side holes. <br>
<br>
My few trials years ago with some holes was inconclusive, but I now
think to seriosly consider them again. <br>
<br>
Many, 9, 3, zero is certainly a wide range. <br>
<br>
So, let's try to collectively become better informed about this.
So far, the "theory" (shown to work) is that a small entry of
secondary air just above the slowly decending level of the top of
the charcoal inside a TLUD stove, produces as small flame (usually
light blue because ti is burning CO and maybe H.)<br>
<br>
Okay, how many holes? positions? diameters? And what factors
(including diameter and height of the fuel chamber, fuel, ND vs FA)
are to be considered.<br>
<br>
In the end, the practical, funcitonal results are what matter. So
experiments are important to do and to be reported.<br>
<br>
Comments, please. [This topic could be an example of why and how
the Stoves Listserv is really valuable.]<br>
<br>
Paul <br>
<br>
<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 12/9/2017 7:47 AM, Crispin
Pemberton-Pigott wrote:<br>
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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Dear
Paul and Julien<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">I
am responding to Paul’s comments on Julien’s earlier
message.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal">On Dec 7, 2017, at 6:51 AM, Paul
Anderson <<a href="mailto:psanders@ilstu.edu"
moz-do-not-send="true">psanders@ilstu.edu</a>>
wrote:<o:p></o:p></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">> 1. The thermal mass is
estracting heat, meaning cooler gases inside the
chamber, with risk of insufficient temperature for
ignition at the top, especially when nearing the end
of pyrolysis.<o:p></o:p></p>
<p class="MsoNormal" style="margin-right:36.0pt"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-right:36.0pt">Before
anyone worries about heat going into the stove body,
please perform the trivial calculation about
<i>how much</i> heat we are talking about. Just
because heat goes into a stove body does not mean a)
it is significant, b) that it happens at a time that
affects performance of the cooking experience, c) that
it is not returned later in the session (which is
cooking behaviour-dependent.) Yes, there is heat
invested in the stove and usually it is a loss, but
the other features of the stove may not only recover
that heat through other energy paths, it may make the
stove far more accessible by being cheap and easy to
make from local materials.<o:p></o:p></p>
<p class="MsoNormal"><br>
2. The concrete (or ceramic) inner cylinder does not
have any of the side holes (24 in the metal version).
Such holes allow for some "pilot light" effect after
the char level is below a hole.
<o:p></o:p></p>
<p class="MsoNormal" style="margin-right:36.0pt"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-right:36.0pt">Dr
Nurhuda’s very successful TLUD stove had such pilots
sprinkled around the fuel chamber. The Vesto uses
three holes only, and the purpose is to maintain pilot
lights to ensure the flame never goes out. They are
placed in a way that guarantees a small portion of
char is burned and there is never a need to relight
because of a gust of wind.<o:p></o:p></p>
<p class="MsoNormal" style="margin-right:36.0pt">Regards<o:p></o:p></p>
<p class="MsoNormal" style="margin-right:36.0pt">Crispin<o:p></o:p></p>
<p class="MsoNormal" style="margin-right:36.0pt"><o:p> </o:p></p>
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