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<P>Well I had 186 LB of water and rice, the rice was 50 lb. </P>
<P>Rice has a specific heat capacity of about .33 which is about the same as
16.5 of water so deduct 33.5 from 186 for a mass of about 152.5 lb water
equivalent.</P>
<P>I started with 15 LB. of wood and had 2.95 LB. left over = 12.05 LB. of wood
used, and there was 1.5 LB. of charcoal left.</P>
<P>The simmer time was about 30 min.</P>
<P>The wrapper is 60” x and the vat is 48” long . I estimate the water was
contacting about 36” of the 60” wrapper so the contact area was about 12 sq.
ft.</P>
<P>Does that give you the numbers you need?</P>
<P>Lanny</P></SPAN></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=crispinpigott@gmail.com href="mailto:crispinpigott@gmail.com">Crispin
Pemberton-Pigott</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <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> Sunday, July 28, 2013 1:39 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Stoves] Pot shells / Fin
shells</DIV>
<DIV><BR></DIV>
<DIV class=WordSection1>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt; mso-fareast-language: EN-US">Dear
Lanny<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt; mso-fareast-language: EN-US"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt; mso-fareast-language: EN-US">I
wonder if you can help me out with more numbers. The comparison between a
trough with ends and a pot is interesting. <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt; mso-fareast-language: EN-US"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt; mso-fareast-language: EN-US">Can
you provide some water boiling volumes (initial) and mass of fuel burned? To
check heat transfer efficiency the char mass will be needed. To check the
system efficiency (fuel efficiency) the char should be ignored in most cases.
What I would like to do is calculate the two and see if the surface area of
the pot and vat are important considerations. They should be, but as I often
say, never assume anything.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt; mso-fareast-language: EN-US"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt; mso-fareast-language: EN-US">Best
to check.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt; mso-fareast-language: EN-US"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt; mso-fareast-language: EN-US">The
effective heating area of the vat might be the sheet length x Sin(45) x Sheet
width, or it may be sheet length x width. If the heat transfer efficiency per
sq cm is the same, then the matter will soon be settled with a
calculator.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt; mso-fareast-language: EN-US"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt; mso-fareast-language: EN-US">Thanks<BR>Crispin<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt; mso-fareast-language: EN-US"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt; mso-fareast-language: EN-US"><o:p> </o:p></SPAN></P>
<DIV>
<DIV
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<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; FONT-SIZE: 11pt"
lang=EN-US>From:</SPAN></B><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; FONT-SIZE: 11pt" lang=EN-US>
Stoves [mailto:stoves-bounces@lists.bioenergylists.org] <B>On Behalf Of
</B>Lanny Henson<BR><B>Sent:</B> Monday, July 29, 2013 12:13 AM<BR><B>To:</B>
Discussion of biomass cooking stoves<BR><B>Subject:</B> [Stoves] Pot shells /
Fin shells<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<DIV>
<P class=MsoNormal><SPAN style="FONT-SIZE: 13.5pt">Fins/ pegs/ pot shells/
rocket pots.</SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><SPAN style="FONT-SIZE: 13.5pt">If you are going to use
fins they should be attached to a pot skirt that fits snug and
stays on the pot until it needs to be cleaned. This keeps the soot if any
contained and away from the cook.</SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><SPAN style="FONT-SIZE: 13.5pt">Instead of a fin shell
I am now using a "pot shell" that totally encloses the pot. The pot shell
has a top tray that can be easily slid back for easy access to the pot. This
is actually easier that removing a lid and another benefit with
total enclosure is the pot is heated from the top as well as the sides and
bottom.</SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><SPAN style="FONT-SIZE: 13.5pt">The top tray can also dry
wood and warm food items. </SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><SPAN style="FONT-SIZE: 13.5pt">Another benefit of the pot
shell is that it makes cooking in the rain
possible.</SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><SPAN style="FONT-SIZE: 13.5pt">The construction is very
simple and it can be built from most any material that is non
combustible.</SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><SPAN style="FONT-SIZE: 13.5pt">A section of drum fits over
a 40 qt sauce pot or a 60 qt stock pot. The pot handles may have to be bent in
a little or the pot shell can be slightly oval to fit over the
handles.</SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><SPAN style="FONT-SIZE: 13.5pt">A pot shell requires a flat
top stove body or a burner under a flat surface.</SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><SPAN style="FONT-SIZE: 13.5pt">I believe the pot
shell is the biggest bang for the buck to improve a stoves performance. They
are cheep and easy to build. They add draft without allowing too much, they
capture the heat, and allow cooking outdoor in the
rain.</SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><SPAN style="FONT-SIZE: 13.5pt">If the pot
shell design helps your stove, run with it, and that goes for
everyone.</SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><SPAN style="FONT-SIZE: 13.5pt">I will have a video
later today showing its use</SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 13.5pt">Lanny</SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV></DIV>
<P>
<HR>
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