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Dear Scott and Todd, (another of 3 replies to about a dozen
messages on this topic. Not in any special order. I thank everyone
for their comments.)<br>
<br>
The essence of TLUD operations is the pyrolysis stage. Stoves that
are true TLUDs and THEN continue to consume the char (which is
called "char gasification") will end up with only ash. They were
operated in two ombustion modes (first was TLUD pyrolysis, and
second was charcoal burning). Those could be valid as stoves, but
the second mode should be noted, and not simply called TLUD only
stoves. <br>
<br>
The other type of stove is the "fan jet" or high vortex stoves like
the Philips /ACE, which are designed to push plenty of secondary air
downward onto the top of the created char, with the result of very
little char production. I prefer to not call them TLUD stoves, and
instead use a name that is appropriate to recognize the distinctive
way those stoves work, which may be more desireable to some people.
Why call it a TLUD and not take credit for the powerful fan
features? <br>
<br>
Todd might specifically identify which stoves he is mentioning.
[That would be a very appropriate discussion of the stoves that he
is able to provide to interested people. And DO include the
prices.]<br>
<br>
Ron's comments about the 3 main ways of handling the char (his
message dated 10 Dec) is well stated. (He asked for my opinion.)<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 12/10/2017 2:25 PM, Scott Zager
wrote:<br>
</div>
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<p class="MsoNormal">Thank you for helping a novice along. Todd
has help clarify that there are many types of TLUDs. Are they
all intended to be gasifiers with a secondary combustion
chamber or collection tank for wood-gas? Is it still pyrolysis
if the stove combusts char to ash? Perhaps I should continue
reading the literature. Thanks again for your patient
assistance.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Scott Zager<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>From:</b> Stoves
[<a class="moz-txt-link-freetext" href="mailto:stoves-bounces@lists.bioenergylists.org">mailto:stoves-bounces@lists.bioenergylists.org</a>]
<b>On Behalf Of </b>Todd Albi<br>
<b>Sent:</b> Sunday, December 10, 2017 1:05 PM<br>
<b>To:</b> Discussion of biomass cooking stoves
<a class="moz-txt-link-rfc2396E" href="mailto:stoves@lists.bioenergylists.org"><stoves@lists.bioenergylists.org></a><br>
<b>Subject:</b> Re: [Stoves] Understanding TLUDs, MPF and
more. (was Re: Bangladesh TLUD )<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Scott:<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Different TLUD stoves are designed to
accomplish different tasks. There are TLUDs designed for
different tasks. Char production will differs
considerably from one design to another. Many high
efficiency TLUDs designed for wok cooking produce minimal,
if any char. There are lots of fan assisted TLUDs and
natural draft TLUDs, designed for cooking that produce
minimal char, only minimal fine ash. Therefore your
glossary is incorrect leading off with the statement
<i>TLUDs automatically make char</i> would be incorrect
for many TLUDs that are designed for cooking. Although
there a number of natural draft cooking TLUDs designs too,
that the definition maybe be somewhat accurate for. Our
organization has several TLUDs designed for cooking that
produce only a thimble full of fine ash after cooking.
Those cooking implements obviously would no value for a
stover, who sits on the bio char production interest side
of the fence.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Many of the stove designs on this list
have variable design advantages, disadvantages,
<i>depending on desired performance outcomes</i> of stove
design. I'd contend more complicated combination cooking
and thermal siphon heating stove designs, typically
compact stove designs with fans, large combustion
chambers, and water tanks, would not be viable
transferring heat into larger volumes of water (high
mass), if designed to produced char at the same time.
Large volumes of char would impede ventilation and heat
transfer, that is required to maximize heat transfer into
the water. Heating the water would be the greater energy
task, to reach the desired goal of thermal siphoning in
this simplified example. In this type of stove, char
production would reduce stove thermal efficiency required
to maximize heat transfer to the water tank. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Regards,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Todd Albi, SilverFire<o:p></o:p></p>
</div>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
<br>
</div>
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