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Crispin,<br>
<br>
Your recent messages and responses are highly encouraging. This
heater (with a hot-plate top) should be further pursued. What are
the interest levels and options for getting some production of some
units, and their installation?<br>
<br>
Summer season is coming, so the urgency of needing heat is passed.
But to be ready for next September, planning should be started
now. Can a core group be formed that will follow up on this? I
ask Manzura to please comment on any prospects that she sees (send
replies to personal addresses because you are not on the Stove
Listserv).<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 3/13/2016 7:10 AM, Crispin
Pemberton-Pigott wrote:<br>
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Dear Andrew</div>
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I should clarify that the 540 degrees is the outside of the
pipe. I understood from your question it might refer to the
temperature inside. </div>
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There are two potential 'ideal' applications for this unit:
space heating (in which case we want the heat) plus metal pipe
chimney heating before leaving the room, and as a heat source
for some application, which could include heating a brick wall,
water heating, of running a gas-to-air heater, basically a big
box. </div>
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The secondary air could easily be preheated as you suggest. I
would make a chamber around the holes (which are the right size)
and lead the entrance downwards in a single channel so I could
control it. At the moment it is fixed in terms of flow and that
has limitations, though I can add I didn't find much evidence to
worry about. It is spectacularly clean. Adding anything would
increase the cost and in rural Tajikistan absolute first cost is
a serious problem for acquisition. </div>
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That points to two sizes with a different level of complexity
and that is OK. The minimalist version at $32 is a great deal,
and accessible. In a 'sauna' which is not exactly like a
classic swedish system, it would provide room heat and hot water
at very low cost. </div>
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The bottom didn't seem to have a problem regarding the burnout
of the char. With the unshielded walls there was some high
temperature char in a circle around the core of white ash. We
sifted it out and put it into the next burn with great success.
In fact I added it to the fire halfway through and it had no
effect on emissions which pleased me greatly. </div>
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Regards </div>
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Crispin </div>
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<div class="PlainText">[Default] On Sun, 13 Mar 2016 16:14:45
+0800,Crispin Pemberton-Pigott<br>
<a class="moz-txt-link-rfc2396E" href="mailto:crispinpigott@outlook.com"><crispinpigott@outlook.com></a> wrote:<br>
<br>
>You can see the<br>
>The outside temperature in the centre of the height rises
to about 540 C once the pyrolysis layer passes by. This gives
it a heating efficiency of about 50% without applying any of
the stack heat to another task. To bring this number down and
send more into the axhause it would be necessary to place some
sort of ceramic lining in the chamber.
<br>
<br>
If the temperature is that low (maybe apart from the final
burnout at<br>
the bottom which would need refractory??) why not have an
outer skin<br>
of sheet steel in which the secondary air is preheated? This
outer<br>
sheet could then be insulated on the outside to keep down
overall heat<br>
losses.<br>
<br>
AJH<br>
<br>
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