<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<div class="moz-cite-prefix">Martin,<br>
<br>
I found your comments to be very interesting and useful. <br>
<br>
You wrote:<br>
<blockquote type="cite">
<div>And these thoughts lead to the questions about, how
small/less-powered a wood- or a wood-gas-stove can be
constructed.</div>
<div>Thoughts and solutions about the heat-loss by radiation
will come into compilation, as well as fuel size and shape.</div>
<div><br>
</div>
</blockquote>
I am VERY interested in the small stoves, and am working on them,
as are several others. Let's see what develops.<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>
On 5/25/2014 3:43 PM, Boll, Martin Dr. wrote:<br>
</div>
<blockquote
cite="mid:FE3FD4BD-5857-4E9F-ADB3-1AEE3A95B88D@t-online.de"
type="cite">
<meta http-equiv="Content-Type" content="text/html;
charset=ISO-8859-1">
There are a lot of burning principles we all think they are very
trivial, but I think, it is worth thinking/meditating about.
<div><br>
<div>The advantage is,they are well known, the disadvantage is,
all of us are not every time aware of the aspect they give,
seen out of the most different angles of view.</div>
<div>Happily the stovers are a very inhomogenous community, so
that the personal angle of view differs a lot. And each other
telling combined gives a more "three-dimensional" view; -very
happily!</div>
<div><br>
</div>
<div> My first attempt about:</div>
<div>1. Self-ignition temperature ( further as: SIT)</div>
<div><br>
</div>
<div>To get a sustaining burn, there must be _always_ a
temperature above the SIT of the fuel.</div>
<div>By burning wood we have to deal first with the high SIT of
woodgas and then with the low SIT of charcoal.</div>
<div>Therefore it is "hard" to start a wood/woodgas fire, but
easy to maintain a charcoal-glow.</div>
<div><br>
</div>
<div>Appliance: </div>
<div>-Starting a fire by friction is first making charcoal-dust,
to have a fuel with low SIT, so low that we can reach it by
friction.</div>
<div>We could never reach the SIT of/for woodgas by friction.</div>
<div><br>
</div>
<div><br>
</div>
<div>2. The flash-point-temperature: (further as: FPT)</div>
<div><br>
</div>
<div>Appliance:</div>
<div>- Starting fire with a spark (-high temperature-), we can
use a very fine "split" fuel as cotton-wool, or some wool-like
seeds (Common dandelion, Taraxacum officinale;<span
class="Apple-tab-span" style="white-space: pre;"> </span></div>
<div>Canadian Poplar, Populus Canadensis; Field thistle, Cirsium
arvense ) . That tends to be very similar to a gas-air cloud,
which is above burnable liquids, with low evaporation
temperature.</div>
<div><br>
</div>
<div><br>
</div>
<div>Different fuel; how to rise its flame temperature:</div>
<div><br>
</div>
<div>Charcoal ( has low SIT): Simply blow cold air onto the
charcoal, -even excessively blow does work.</div>
<div>Woodgas ( has high SIT ): Make a good gas-air-mixture, but
avoid too fast air-stream (blow-out)</div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span> even
important ore more: Reduction of overflow air, pre-warming of
used air, ideally prewarmed to or near SIT.</div>
<div><span class="Apple-tab-span" style="white-space:pre"> </span>But
the other advantage; woodgas has a low FPT, and can therefore
be lit/relit with a spark ( e.g. woodgas driven engines) </div>
<div><br>
</div>
<div>All those thoughts are basics to help to succeed or fail in
appliance, and now worth to combine with the discussion, about
turning-down-ratio in progress.</div>
<div>The very good reported turn-down experiments, are good
examples of applied basics.</div>
<div><br>
</div>
<div>Because of the different SITs, we are aware of: It is more
difficult, to run a _very_ small woodgas-fire in comparison
with an even-powered _very_ small charcoal-fire.</div>
<div><br>
</div>
<div>And these thoughts lead to the questions about, how
small/less-powered a wood- or a wood-gas-stove can be
constructed.</div>
<div>Thoughts and solutions about the heat-loss by radiation
will come into compilation, as well as fuel size and shape.</div>
<div><br>
</div>
<div>Interested to see your ideas and angles of view about in
discussion, to get a more "three-dimensional" view for all of
us.</div>
<div><br>
</div>
<div>Regards</div>
<div>Martin</div>
<div><br>
</div>
<div> </div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Stoves mailing list
to Send a Message to the list, use the email address
<a class="moz-txt-link-abbreviated" href="mailto:stoves@lists.bioenergylists.org">stoves@lists.bioenergylists.org</a>
to UNSUBSCRIBE or Change your List Settings use the web page
<a class="moz-txt-link-freetext" href="http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org">http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org</a>
for more Biomass Cooking Stoves, News and Information see our web site:
<a class="moz-txt-link-freetext" href="http://stoves.bioenergylists.org/">http://stoves.bioenergylists.org/</a>
</pre>
</blockquote>
<br>
</body>
</html>