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</font><BR><p class="MsoNoSpacing" style="margin: 0cm 0cm 0pt;"><span lang="EN-US" style="mso-ansi-language: EN-US;">Kirk
Harris, Paul A and Ron L,<o:p></o:p></span></p><font face="Times New Roman">
</font><BR><p class="MsoNoSpacing" style="margin: 0cm 0cm 0pt;"><span lang="EN-US" style="mso-ansi-language: EN-US;">I am not
assuming that the Peko Pe, will pass the ISO IWA low power test as a tier 4
stove, but I find it a bit odd that your method 2, is describing very much how
the Peko Pe used to operate and now operates, including an adjustable primary
air intake.<o:p></o:p></span></p><font face="Times New Roman">
</font><BR><p class="MsoNoSpacing" style="margin: 0cm 0cm 0pt;"><span lang="EN-US" style="mso-ansi-language: EN-US;">Robert,
saw the similarity for the lower secondary air inlet in the combustion chamber,
just like the old type of Peko Pe from Uganda in the 1990`s and I noticed the
adjustable inlet for primary air, like in the newest model.<o:p></o:p></span></p><font face="Times New Roman">
</font><span lang="EN-US" style="mso-ansi-language: EN-US;"></span><BR><span lang="EN-US" style="mso-ansi-language: EN-US;">In a micro
gasifier unit, like the Peko Pe, you can also easily “adjust” the amount of fuel to
be used for each cooking.<o:p></o:p></span><BR><font face="Times New Roman">
</font><BR><p class="MsoNoSpacing" style="margin: 0cm 0cm 0pt;"><span lang="EN-US" style="mso-ansi-language: EN-US;">Just add
fuel to a bit above the bottom plate and your flame will reach the pot, any how,
due to the secondary inlet and the gasification process. <o:p></o:p></span></p><font face="Times New Roman">
</font><BR><p class="MsoNoSpacing" style="margin: 0cm 0cm 0pt;"><span lang="EN-US" style="mso-ansi-language: EN-US;"><o:p> </o:p></span><span lang="EN-US" style="mso-ansi-language: EN-US;">A “Rocket”
stove will produce more or less the same thermal efficiency, but with a higher
PM.<o:p></o:p></span></p><font face="Times New Roman">
</font><span lang="EN-US" style="mso-ansi-language: EN-US;">These
types of stoves are of course more efficient than a three stone fire, but the
PM is very much the same as any open fire, apart from emissions from a micro gasifier
unit.<o:p></o:p></span><BR><font face="Times New Roman">
</font><BR><p class="MsoNoSpacing" style="margin: 0cm 0cm 0pt;"><span lang="EN-US" style="mso-ansi-language: EN-US;">It would
help, if a Rocket” stove was lit from the top, but still the strong draft in that
narrow chimney, will create toxic emissions and PM to flow into the (air) room.
<span style="mso-spacerun: yes;"> </span><o:p></o:p></span></p><font face="Times New Roman">
</font><BR><p class="MsoNoSpacing" style="margin: 0cm 0cm 0pt;"><span lang="EN-US" style="mso-ansi-language: EN-US;">I think
you should also look into the Prime cookstoves, invented and patented by Dr. M.
Nurhuda, Professor of Physics, Brawijaya University, Malang, Indonesia, when it
comes to lower and power down the flame.<o:p></o:p></span></p><font face="Times New Roman">
</font><BR><p class="MsoNoSpacing" style="margin: 0cm 0cm 0pt;"><span lang="EN-US" style="mso-ansi-language: EN-US;">I guess
he would not be “too happy” to find out that you are calling his PrimeStove –
Wonderwerk…………?<o:p></o:p></span></p><font face="Times New Roman">
</font><BR><p class="MsoNoSpacing" style="margin: 0cm 0cm 0pt;"><span lang="EN-US" style="mso-ansi-language: EN-US;">“Your
method” 3, by lifting the char in the combustion chamber, has been declined some
time back, considered to be too complicated. <o:p></o:p></span></p><font face="Times New Roman">
</font><BR><p class="MsoNoSpacing" style="margin: 0cm 0cm 0pt;"><span lang="EN-US" style="mso-ansi-language: EN-US;">We just
put the remaining char into a standard charcoal stove, which you will find all
over the African continent, for further simmering. <o:p></o:p></span></p><font face="Times New Roman">
</font><BR><p class="MsoNoSpacing" style="margin: 0cm 0cm 0pt;"><span lang="EN-US" style="mso-ansi-language: EN-US;">Good
luck with your efforts and tests.</span></p><p class="MsoNoSpacing" style="margin: 0cm 0cm 0pt;"><span lang="EN-US" style="mso-ansi-language: EN-US;">It is very much needed, but correct and proper references,
should be mentioned and not “nick named”, that`s all.<o:p></o:p></span></p><font face="Times New Roman">
</font><BR><p class="MsoNoSpacing" style="margin: 0cm 0cm 0pt;"><span lang="EN-US" style="mso-ansi-language: EN-US;">Otto <o:p></o:p></span></p><font face="Times New Roman">
</font><br> <BR><div><hr id="stopSpelling">From: kgharris@sonic.net<br>To: stoves@lists.bioenergylists.org<br>Date: Tue, 20 May 2014 11:38:15 -0700<br>Subject: Re: [Stoves] Natural draft TLUD turn-down<br><br>
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<p class="ecxMsoNormal" style="margin: 0in 0in 0pt; line-height: normal;"><span style='font-family: "Arial","sans-serif"; font-size: 10pt;'>Otto
and all,</span><span style="font-size: 12pt;"></span></p>
<p class="ecxMsoNormal" style="margin: 0in 0in 0pt; line-height: normal;"><span style='font-family: "Arial","sans-serif"; font-size: 10pt;'> </span></p>
<p class="ecxMsoNormal" style="margin: 0in 0in 0pt; line-height: normal;"><span style='font-family: "Arial","sans-serif"; font-size: 10pt;'>The
Peko Pe is an incredible stove and the man who created it is even more
incredible. I wish I had met Paal Wendelbo, but I missed out on that privilege.
I have met lots of other really incredible people though.</span><span style="font-size: 12pt;"></span></p>
<p class="ecxMsoNormal" style="margin: 0in 0in 0pt; line-height: normal;"><span style='font-family: "Arial","sans-serif"; font-size: 10pt;'> </span></p>
<p class="ecxMsoNormal" style="margin: 0in 0in 0pt; line-height: normal;"><span style='font-family: "Arial","sans-serif"; font-size: 10pt;'>If
the Peko Pe can pass the ISO IWA low power tests as a tier 4 stove then I will
agree with you. If not then I will continue my struggles with the Wonderwerk
test stoves in that direction. When I go to Stove Camp at Aprovecho this summer,
I want to see a TLUD with low power tier 4 capabilities, be it a Wonderwerk
stove or someone else’s stove. Come on TLUD folks, we're getting our butts
kicked by the rocket people here.</span><span style="font-size: 12pt;"></span></p>
<p class="ecxMsoNormal" style="margin: 0in 0in 0pt; line-height: normal;"><span style='font-family: "Arial","sans-serif"; font-size: 10pt;'> </span></p>
<p class="ecxMsoNormal" style="margin: 0in 0in 0pt; line-height: normal;"><span style='font-family: "Arial","sans-serif"; font-size: 10pt;'>Kirk
Harris</span><span style="font-size: 12pt;"></span></p>
<p class="ecxMsoNormal" style="margin: 0in 0in 0pt; line-height: normal;"><span style='font-family: "Arial","sans-serif"; font-size: 10pt;'>Santa
Rosa, CA. USA</span><span style="font-size: 12pt;"></span></p></font></div>
<blockquote style="padding-right: 0px; padding-left: 5px; margin-right: 0px; margin-left: 5px; border-left-color: rgb(0, 0, 0); border-left-width: 2px; border-left-style: solid;">
<div style="font: 10pt/normal arial; font-size-adjust: none; font-stretch: normal;">----- Original Message ----- </div>
<div style="background: rgb(228, 228, 228); font: 10pt/normal arial; font-size-adjust: none; font-stretch: normal;"><b>From:</b>
<a title="terra-matricula@hotmail.com" href="mailto:terra-matricula@hotmail.com">Otto Formo</a> </div>
<div style="font: 10pt/normal arial; font-size-adjust: none; font-stretch: normal;"><b>To:</b> <a title="stoves@lists.bioenergylists.org" href="mailto:stoves@lists.bioenergylists.org">Stoves Bioenergylist</a> </div>
<div style="font: 10pt/normal arial; font-size-adjust: none; font-stretch: normal;"><b>Sent:</b> Monday, May 19, 2014 11:56 PM</div>
<div style="font: 10pt/normal arial; font-size-adjust: none; font-stretch: normal;"><b>Subject:</b> Re: [Stoves] Natural draft TLUD
turn-down</div>
<div><br></div>
<div dir="ltr">Dear Roberto,<br> <br>I very much agree with
you.<br> <br>The Kirk Harris "stove", looks very much familiar and
alike the way the Peko Pe has solved this issues and to me it is a REAL
wonderwerk, so why call it with a nick name: <br>Wonderwerk TLUD
??<br> <br>This issues can be and are partly solved by the Peko Pe
consept - "Problem no", Acoli tribe, Northern Uganda 1994
-95.<br> <br>Otto<br> <br>
<div>
<hr id="ecxstopSpelling">
Date: Tue, 20 May 2014 08:38:41 +0900<br>From:
crispinpigott@outlook.com<br>To: stoves@lists.bioenergylists.org<br>Subject:
Re: [Stoves] Natural draft TLUD turn-down<br><br>
<div style='width: 100%; color: rgb(31, 73, 125); font-family: Calibri, "Slate Pro", sans-serif; background-color: rgb(255, 255, 255);'>Dear
Roberto</div>
<div style='width: 100%; color: rgb(31, 73, 125); font-family: Calibri, "Slate Pro", sans-serif; background-color: rgb(255, 255, 255);'><br></div>
<div style='width: 100%; color: rgb(31, 73, 125); font-family: Calibri, "Slate Pro", sans-serif; background-color: rgb(255, 255, 255);'>I
agree with your analysis. There is a lot of merit in keeping the secondary
flame in close proximity to the top of the fuel bed. The most important is
that the secondary flame is harder to put out with a slight breeze (because it
relights). The second is that when the primary air is turned down to control
the power, the secondary flame is able to remain hot enough to stay alight.
Combined with external, down-drafting secondary air preheating (not like the
Peko Pe) one can maintain the secondary air feed ration under different
primary air conditions. </div>
<div style='width: 100%; color: rgb(31, 73, 125); font-family: Calibri, "Slate Pro", sans-serif; background-color: rgb(255, 255, 255);'><br></div>
<div style='width: 100%; color: rgb(31, 73, 125); font-family: Calibri, "Slate Pro", sans-serif; background-color: rgb(255, 255, 255);'>Read
and heed! TLUD's are not succeeding in meeting the turndown ratios required by
ordinary cooking. To burn clean at different burn rates, whatever the fuel,
you have to control both the primary and secondary air flows. </div>
<div style='width: 100%; color: rgb(31, 73, 125); font-family: Calibri, "Slate Pro", sans-serif; background-color: rgb(255, 255, 255);'><br></div>
<div style='width: 100%; color: rgb(31, 73, 125); font-family: Calibri, "Slate Pro", sans-serif; background-color: rgb(255, 255, 255);'>While
a 'double controller' can work, turning the secondary air down at exactly the
same time as the primary leads to a 2-3 minute period of very high PM and or
CO and VOC's because of the retained heat in the fuel bed and stove body. This
is worse if the combustion chamber is ceramic or cast iron. </div>
<div style='width: 100%; color: rgb(31, 73, 125); font-family: Calibri, "Slate Pro", sans-serif; background-color: rgb(255, 255, 255);'><br></div>
<div style='width: 100%; color: rgb(31, 73, 125); font-family: Calibri, "Slate Pro", sans-serif; background-color: rgb(255, 255, 255);'>If
the secondary air feed it an automatic, buoyancy-driven ýsupply, it will draw
in additional air as required during the cooling-off period. This explains the
strange layout of the air supply in a Vesto Stove which tried to address the
problems inherent in David Hancock's (very advanced at the time) 1984 Tsotso
Stove (which is still in production). </div>
<div style='width: 100%; color: rgb(31, 73, 125); font-family: Calibri, "Slate Pro", sans-serif; background-color: rgb(255, 255, 255);'><br></div>
<div style='width: 100%; color: rgb(31, 73, 125); font-family: Calibri, "Slate Pro", sans-serif; background-color: rgb(255, 255, 255);'>Regards </div>
<div style='width: 100%; color: rgb(31, 73, 125); font-family: Calibri, "Slate Pro", sans-serif; background-color: rgb(255, 255, 255);'>Crispin
in Seoul enjoying spring </div>
<div style='width: 100%; color: rgb(31, 73, 125); font-family: Calibri, "Slate Pro", sans-serif; background-color: rgb(255, 255, 255);'><br></div>
<div style='color: rgb(31, 73, 125); font-family: Calibri, "Slate Pro", sans-serif; background-color: rgb(255, 255, 255);'>BBM
2B567C3</div>
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<div><b>From: </b>Roberto Poehlmann</div>
<div><b>Sent: </b>Tuesday, May 20, 2014 02:28</div>
<div><b>To: </b>stoves@lists.bioenergylists.org</div>
<div><b>Reply To: </b>Discussion of biomass cooking stoves</div>
<div><b>Subject: </b>Re: [Stoves] Natural draft TLUD
turn-down</div></div></td></tr></tbody></table>
<div style="border-style: solid none none; border-top-color: rgb(186, 188, 209); border-top-width: 1pt; background-color: rgb(255, 255, 255);"></div><br>
<div>
<div dir="ltr">
<div>Kirk,</div>
<div>this is a very interesting document, thanks to share it.</div>
<div><br></div>
<div>The method 2 is like the 12 holes configuration of the Peko Pe design in
page 9 of the following document:</div>
<div><br></div>
<div><a href="http://www.adansonia-consulting.ch/document/Grass%20Cooker%20handbook_print.pdf?PHPSESSID=3d064accc3efbdafd3b1133a13129f9a" target="_blank">http://www.adansonia-consulting.ch/document/Grass%20Cooker%20handbook_print.pdf?PHPSESSID=3d064accc3efbdafd3b1133a13129f9a</a><br></div>
<div><br></div>
<div>Maybe this is the reason that the Peko Pe stove don't need an internal
chimney to operate. This 12 holes function also like 12 pilot flames,
maintaining the secondary flame hot.</div>
<div><br></div>
<div>I have replicated this design of the Peko Pe, and in operation, you can
see the pilot flames attached to the 12 holes.</div>
<div><br></div>
<div>Maybe the 4 holes concept in the middle of the combustion chamber can
also helps to maintain a slow power consumption. When the pyrolysis front
reach the middle of the combustion chamber, this "primary air" start to
combust the charcoal, adding heat to also support the flame.</div>
<div><br></div>
<div>Roberto Poehlmann</div>
<div>Valdivia Chile.</div>
<div><br></div>
<div><br></div>
<div>"</div><span style="font-family: arial,sans-serif; font-size: 13px;">All,</span><br style="font-family: arial,sans-serif; font-size: 13px;"><br style="font-family: arial,sans-serif; font-size: 13px;"><span style="font-family: arial,sans-serif; font-size: 13px;">Dr. Ron Larson, Dr.
Paul Anderson and I have been working on the problem of lack of turn-down in
natural draft TLUD cook stoves. We have found considerable success.
Attached is a document introducing the results of our labors. All
information is in the public domain.</span><br style="font-family: arial,sans-serif; font-size: 13px;"><br style="font-family: arial,sans-serif; font-size: 13px;"><span style="font-family: arial,sans-serif; font-size: 13px;">K Harris</span><br style="font-family: arial,sans-serif; font-size: 13px;"><span style="font-family: arial,sans-serif; font-size: 13px;">Santa Rosa, CA.
USA</span><br style="font-family: arial,sans-serif; font-size: 13px;"><br style="font-family: arial,sans-serif; font-size: 13px;"><span style="font-family: arial,sans-serif; font-size: 13px;">-------------- next
part --------------</span><br style="font-family: arial,sans-serif; font-size: 13px;"><span style="font-family: arial,sans-serif; font-size: 13px;">A non-text attachment
was scrubbed...</span><br style="font-family: arial,sans-serif; font-size: 13px;"><span style="font-family: arial,sans-serif; font-size: 13px;">Name: Harris TLUD
turn-down 05 15 14 (1).pdf</span><br style="font-family: arial,sans-serif; font-size: 13px;"><span style="font-family: arial,sans-serif; font-size: 13px;">Type:
application/pdf</span><br style="font-family: arial,sans-serif; font-size: 13px;"><span style="font-family: arial,sans-serif; font-size: 13px;">Size: 332120
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