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<P style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'">Otto
and all,</SPAN><SPAN
style="FONT-SIZE: 12pt; mso-fareast-font-family: 'Times New Roman'; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'"><?xml:namespace
prefix = o ns = "urn:schemas-microsoft-com:office:office"
/><o:p></o:p></SPAN></P>
<P style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'"><o:p> </o:p></SPAN></P>
<P style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'">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; mso-fareast-font-family: 'Times New Roman'; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'"><o:p> </o:p></SPAN></P>
<P style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'">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; mso-fareast-font-family: 'Times New Roman'; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'"><o:p> </o:p></SPAN></P>
<P style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'">Kirk
Harris</SPAN><SPAN
style="FONT-SIZE: 12pt; mso-fareast-font-family: 'Times New Roman'; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'">Santa
Rosa, CA. USA</SPAN><SPAN
style="FONT-SIZE: 12pt; mso-fareast-font-family: 'Times New Roman'; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'"><o:p></o:p></SPAN></P></FONT></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=terra-matricula@hotmail.com
href="mailto:terra-matricula@hotmail.com">Otto Formo</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=stoves@lists.bioenergylists.org
href="mailto:stoves@lists.bioenergylists.org">Stoves Bioenergylist</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, May 19, 2014 11:56 PM</DIV>
<DIV style="FONT: 10pt arial"><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=stopSpelling>
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="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)">Dear
Roberto</DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><BR></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)">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="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><BR></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)">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="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><BR></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)">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="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><BR></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)">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="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><BR></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)">Regards </DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)">Crispin
in Seoul enjoying spring </DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><BR></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)">BBM
2B567C3</DIV>
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id=ecx_persistentHeader>
<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-BOTTOM-STYLE: none; BACKGROUND-COLOR: rgb(255,255,255); BORDER-LEFT-STYLE: none; BORDER-RIGHT-STYLE: none; BORDER-TOP: rgb(186,188,209) 1pt solid"></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
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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
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style="FONT-FAMILY: arial,sans-serif; FONT-SIZE: 13px">Type:
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