<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=utf-8" http-equiv=Content-Type>
<STYLE type=text/css>P {
MARGIN: 0px
}
</STYLE>
<META name=GENERATOR content="MSHTML 8.00.6001.23501"></HEAD>
<BODY bgColor=#ffffff>
<DIV>
<P
style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"
class=MsoNormal><SPAN
style="FONT-SIZE: 14pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-font-kerning: 14.0pt; mso-bidi-font-weight: bold"><FONT
face=Calibri><FONT size=3></FONT></FONT></SPAN> </P>
<P
style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"
class=MsoNormal><SPAN
style="FONT-SIZE: 14pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-font-kerning: 14.0pt; mso-bidi-font-weight: bold"><FONT
face=Calibri><FONT size=3></FONT></FONT></SPAN> </P>
<P
style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"
class=MsoNormal><SPAN
style="FONT-SIZE: 14pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-font-kerning: 14.0pt; mso-bidi-font-weight: bold"><FONT
face=Calibri><FONT size=3></FONT></FONT></SPAN> </P>
<P
style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"
class=MsoNormal><SPAN
style="FONT-SIZE: 14pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-font-kerning: 14.0pt; mso-bidi-font-weight: bold"><FONT
face=Calibri><FONT size=3><1. An alternative to a chimney is a vent
hood. Could that work in a Maasai home?></FONT><BR></FONT></SPAN></P>
<P
style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"
class=MsoNormal><SPAN
style="FONT-SIZE: 14pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-font-kerning: 14.0pt; mso-bidi-font-weight: bold"><FONT
face=Calibri>If your family size stove is efficient there may not be enough hot
exhaust for a hood system because you have to heat the whole hood and duct to
make it draft.<?xml:namespace prefix = o ns =
"urn:schemas-microsoft-com:office:office" /><o:p></o:p></FONT></SPAN></P>
<P
style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"
class=MsoNormal><SPAN
style="FONT-SIZE: 14pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-font-kerning: 14.0pt; mso-bidi-font-weight: bold"><FONT
face=Calibri>Hoods with stacks and heavy brick chimneys will usually draft
themselves naturally but you can’t count it.<o:p></o:p></FONT></SPAN></P>
<P
style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"
class=MsoNormal><SPAN
style="FONT-SIZE: 14pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-font-kerning: 14.0pt; mso-bidi-font-weight: bold"><FONT
face=Calibri>A thin metal chimney will create the best
draft.<o:p></o:p></FONT></SPAN></P>
<P
style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"
class=MsoNormal><SPAN
style="FONT-SIZE: 14pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-font-kerning: 14.0pt; mso-bidi-font-weight: bold"><FONT
face=Calibri>Too tall a chimney can pull too much heat from the stove; <SPAN
style="mso-spacerun: yes"> </SPAN>about 2 meters of draft should be enough
to make any stove cook but, <o:p></o:p></FONT></SPAN></P>
<P
style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"
class=MsoNormal><SPAN
style="FONT-SIZE: 14pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-font-kerning: 14.0pt; mso-bidi-font-weight: bold"><FONT
face=Calibri>2 meters of stove and chimney will not get you out the roof so a
draft diverter maybe a solution. A draft diverter is like a very small hood and
the stove pipe extends up in the draft diverter.<o:p></o:p></FONT></SPAN></P>
<P
style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"
class=MsoNormal><SPAN
style="FONT-SIZE: 14pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-font-kerning: 14.0pt; mso-bidi-font-weight: bold"><FONT
face=Calibri><SPAN style="mso-spacerun: yes"> </SPAN>A draft diverter is
small enough to heat with a small stove and create enough draft, but does not
add draft to the stack below the draft diverter. If the upper chimney section it
too hot and has more draft than the lower chimney the upper pipe draws in some
room air through the draft diverter. <o:p></o:p></FONT></SPAN></P>
<P
style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"
class=MsoNormal><SPAN
style="FONT-SIZE: 14pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-font-kerning: 14.0pt; mso-bidi-font-weight: bold"><FONT
face=Calibri>Draft diverters also help with wing blowing back down your
stack.<o:p></o:p></FONT></SPAN></P>
<P
style="LINE-HEIGHT: normal; MARGIN: 0in 0in 0pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"
class=MsoNormal><SPAN
style="FONT-SIZE: 14pt; mso-bidi-font-family: Calibri; mso-bidi-theme-font: minor-latin; mso-font-kerning: 14.0pt; mso-bidi-font-weight: bold"><FONT
face=Calibri>Lanny<o:p></o:p></FONT></SPAN></P></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=rongretlarson@comcast.net
href="mailto:rongretlarson@comcast.net">rongretlarson@comcast.net</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=rbtvl@aol.com
href="mailto:rbtvl@aol.com">rbtvl@aol.com</A> ; <A
title=stoves@lists.bioenergylists.org
href="mailto:stoves@lists.bioenergylists.org">Discussion of biomass cooking
stoves</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, June 14, 2013 11:37
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Stoves] Chimneys, rice
husks</DIV>
<DIV><BR></DIV>
<DIV style="FONT-FAMILY: Arial; COLOR: #000000; FONT-SIZE: 12pt">
<STYLE>p { margin: 0; }</STYLE>
<DIV
style="FONT-FAMILY: Arial; COLOR: #000000; FONT-SIZE: 12pt">Bob:<BR><BR>
Nice note. Thanks. <BR><BR>1. An alternative to a
chimney is a vent hood. Could that work in a Maasai
home?<BR><BR>2. Marc Pare (cc'd) spent quite a bit of time
in Viet Nam cleaning up a terrible problem with smoke for brick kilns that
were mostly using rice husk combustion by switching to pyrolysis of husks (and
saving money to boot). Any complaints in Maasai territory on their
technology?<BR><BR>3. Re making bricks, could that be done with
"waste" heat from a charcoal-making stove? I am wondering if anyone on the
list has ever put one raw brick (or pottery, etc) in the combustion region of
a TLUD to make home-made bricks or crafts. At 16 bricks to the $, it
probably doesn't make sense, but that is not the brick price in
Colorado. You also might find some benefits in retained heat cooking
using a just-fired hot brick.<BR><BR>Ron.<BR><BR>
<HR id=zwchr>
<B>From: </B>rbtvl@aol.com<BR><B>To:
</B>stoves@lists.bioenergylists.org<BR><B>Sent: </B>Friday, June 14, 2013
8:59:30 AM<BR><B>Subject: </B>[Stoves] Chimneys, rice husks<BR><BR>The public
health folks, from harvard, Berkeley and the CDC, I have talked to, being only
a physicist myself, have all agreed to the need for chimneys in indoor, poorly
ventilated wood burning settings like we find with the Maasai. To
prevent burns when touched and thatch fires the chimney must be not be
too hot until it is clear above the roof. So our Maasai women
installation teams make a brick chimney. Our present best brick maker
uses rice husks to fire the bricks. He is in Mto wa Mbu where rice is
grown and marketed in the rift valley and gets the husks cheaply. We can get
16 pretty good bricks for a dollar. The husks work well. Chimneys
have to be designed well so that they get the smoke out without throwing away
too much energy of course. Ben Franklin is our guide. But also I
think a reasonably good chimney helps when stoves don't work quite right or
start to deteriorate or aren't used optimally. I know lots of stoves
don't easily accommodate chimneys and that should give pause to introducing
them in poorly ventilated homes no matter how cheap or efficient at boiling
water. Bob Lange. Maasai Stoves and Solar. <BR>Sent from my
Verizon Wireless
BlackBerry<BR>_______________________________________________<BR>Stoves
mailing list<BR><BR>to Send a Message to the list, use the email
address<BR>stoves@lists.bioenergylists.org<BR><BR>to UNSUBSCRIBE or Change
your List Settings use the web
page<BR>http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org<BR><BR>for
more Biomass Cooking Stoves, News and Information see our web
site:<BR>http://stoves.bioenergylists.org/<BR><BR></DIV></DIV>
<P>
<HR>
<P></P>_______________________________________________<BR>Stoves mailing
list<BR><BR>to Send a Message to the list, use the email
address<BR>stoves@lists.bioenergylists.org<BR><BR>to UNSUBSCRIBE or Change
your List Settings use the web
page<BR>http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org<BR><BR>for
more Biomass Cooking Stoves, News and Information see our web
site:<BR>http://stoves.bioenergylists.org/<BR><BR></BLOCKQUOTE></BODY></HTML>