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Dale,<br>
<br>
The side feed is interesting.<br>
<br>
Also interesting is the thought of having a second burner that is
actually a fuel drying "configuration.<br>
<br>
Going one step further, with a "skirt plus side channel" around the
large pot, the hot emisions could be directed to the smaller
pot-position that could receive the heat in an appropriate vertical
"channel" (almost a chimney) where the fuel could be drying.<br>
<br>
Care should be taken that the "chimney" does not steal too much heat
from the large pot. (use a small partition or damper).<br>
<br>
Joke: If you use a damper to help dry the damp fuel, will the fuel
be "un-damped" or some other play on words?<br>
<br>
Paul<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 11/16/2016 2:27 PM, Andreatta, Dale
A. wrote:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">Kirk
and others,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">Thanks
for the compliments. An approximate formula I use for
burning wood is that the energy content in Joules per gram
is 20634-22894*MC where MC is the moisture content on a wet
basis, as a decimal (not a percentage). The 20694 is the
lower heating value of bone dry Douglas Fir. In the second
term, 20694 out of the 22894 is the heat no longer available
in the wood because it’s replaced by water, and the
remaining 2260 is the energy to boil the water itself. With
this formula you’ll have positive energy content up to 90%
moisture. Getting it to sustain combustion would be a
limiting factor. With the downfeed burner I’ve burned wood
up to about 50% moisture, though the flames were getting
pretty weak.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">I
imagine drying wood with a stove would work if the wood is
fairly small, perhaps up to 2 cm diameter. Actually, you’ve
given me an idea. The most recent version of the Versatile
Stove is side feed with both ends closed, rather than end
feed. See photograph. The wood going into the side feed
door would be angled to the left to burn under the big
burner, or to the right to burn under the small burner, or
both to heat 2 pots. This could also allow the small
burner, if it is not being used to heat a pot, to serve as a
wood holder and allow the wood to dry before going into the
fire. The photograph shows the side feed variation, and the
wood drying option.
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">Currently,
I have some sticks soaking in a tub of water to be tested
tonight. If I can get them to burn, along with drier wood
of course, then the wood drier option has merit. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">More
on this later,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">Dale<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
Stoves [<a moz-do-not-send="true"
href="mailto:stoves-bounces@lists.bioenergylists.org">mailto:stoves-bounces@lists.bioenergylists.org</a>]
<b>On Behalf Of </b>kgharris<br>
<b>Sent:</b> Thursday, November 03, 2016 4:48 AM<br>
<b>To:</b> Discussion of biomass cooking stoves<br>
<b>Subject:</b> Re: [Stoves] Practical Stoves-
Introducing The Versatile Stove<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Dale,</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Thank
you for the discussion of your recent work. I especially
like the two versatile pot stands. These look to me to be
very useful. The ability to use thicker and longer
unprocessed wood to give a long burn time with low
maintenance also adds to the versatility. I will have to
think about the wet wood. It might be using more energy
to evaporate the water then there is energy in the wood.
The Prime stove has a nice design which holds wet wood to
the outside of the stove so that waste heat will dry
it. Making provisions to dry it before burning it might
be better then burning it wet. There is a lot to think
about in your discussion.</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Thank
You,</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Kirk
H.</span><o:p></o:p></p>
</div>
<blockquote style="border:none;border-left:solid black
1.5pt;padding:0in 0in 0in
4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt">
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">-----
Original Message -----
<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="background:#E4E4E4"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">
<a moz-do-not-send="true"
href="mailto:dandreatta@sealimited.com"
title="dandreatta@sealimited.com">Andreatta, Dale A.</a>
<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">To:</span></b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">
<a moz-do-not-send="true"
href="mailto:stoves@lists.bioenergylists.org"
title="stoves@lists.bioenergylists.org">
'Discussion of biomass cooking stoves'</a> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Sent:</span></b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">
Wednesday, November 02, 2016 8:39 AM<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Subject:</span></b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">
[Stoves] Practical Stoves- Introducing The Versatile
Stove<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">For
some time I’ve been promoting the idea that stoves need to
have practical features to make them successful.
Efficiency and low smoke are desirable, but not the
primary concern of most users. Here is my first attempt
at providing a stove to do that. For the moment I’m
calling it The Versatile Stove, as it gives the user lots
of options for using the stove.
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">The
main features of the stove are:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">1.</span><span
style="font-size:7.0pt;color:black">
</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">A
very large combustion chamber allows it to burn large
diameter wood of any length. Up to 8 cm diameter has been
successfully burned.
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">2.</span><span
style="font-size:7.0pt;color:black">
</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">It
can handle 2 pots, one being up to 20 cm and the other up
to 30 cm. Round or flat bottom can be used. Actually, a
pot larger than 30 cm could be used, but then it is only a
single pot stove. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">3.</span><span
style="font-size:7.0pt;color:black">
</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">The
pots are cradled between the pot supports and are very
stable (except pots that are greater than 30 cm).<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">4.</span><span
style="font-size:7.0pt;color:black">
</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">With
the large combustion chamber, fuel tending is minimized.
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">5.</span><span
style="font-size:7.0pt;color:black">
</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">The
stove is powerful, 5 liters is regularly brought to a boil
in under 20 minutes.
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">6.</span><span
style="font-size:7.0pt;color:black">
</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">The
stove has some capacity to burn wet wood. This is still
being explored.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">7.</span><span
style="font-size:7.0pt;color:black">
</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">Depending
on how the fuel is arranged and managed, turn down ratios
of about 3:1 are possible.
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">8.</span><span
style="font-size:7.0pt;color:black">
</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">Unfortunately,
fuel use is high and efficiency is low. This is also
being worked on.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">9.</span><span
style="font-size:7.0pt;color:black">
</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">Smoke
seems to be a function of the fire size, as with most
stoves I’ve worked with. A big fire will make black
smoke, the same as any other stove. Wood that isn’t
properly catching fire will make white smoke, the same as
any other stove. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">Attached
is a document with more details and photographs to
illustrate what I’m talking about. There is also
information about future testing and modifications, as the
development of the stove is continuing. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">Also
in the pipeline, I’m a very part time professor at The
Ohio State University, and I’m working with a senior
student group on family size stoves with downfeed
burners. These will be modeled after the downfeed burner
developed by InStove for larger stoves. My work with
downfeed burners in August at Stove Camp was very
positive, so I think this may also produce a very good
stove with a lot of practical features. More on this
after they finish their work in May. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">Dale
Andreatta, Ph.D., P.E.<o:p></o:p></span></p>
<div class="MsoNormal" style="text-align:center"
align="center">
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