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<div class="moz-cite-prefix">Huck,<br>
<br>
Crispin wrote:<br>
<blockquote type="cite"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Thus ‘gasifiers’ are getting rated as if they do
not consume fuel that is actually consumed.</span></blockquote>
Crispin's point is that wood that is turned into charcoal is no
longer wood. THAT is true. But there are two ways to state
the efficiency: Fuel efficiency and Energy efficiency.
Charcoal that is created is no longer wood. But it is a fuel
made from wood that was transformed. And it typically represent
25% to 35% of the energy that is in the dry weight of the wood. <br>
<br>
You indicated that the area is reasonably wooded. So it is not a
case of scarcity of wood. <br>
<br>
If the created charcoal is put into the soil as biochar, then that
energy content is no longer available.<br>
<br>
You as the project leader and with your personnel can make the
decision about how to read the numbers in the reports on stove
efficiency (of fuel or of energy).<br>
<br>
Paul<br>
<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 9/15/2014 10:45 PM, Crispin Pemberton-Pigott wrote:<br>
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Dear
Huck<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Just
one quick point:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">“</span><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">The gasifier, as I understand it, is more
efficient and has lower emissions.”<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<div>
<div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">It depends on the test method and the
metrics. It is fashionable to use the GACC-WBT and
that test does not report fuel consumption, it reports
the fuel mass equivalent of the energy consumption,
treating charcoal left over as unburned raw fuel
(meaning it says the wood was not consumed).</span><span
style="font-size:13.5pt;font-family:"Helvetica","sans-serif""
lang="EN-US"><o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Thus ‘gasifiers’ are getting rated as if they
do not consume fuel that is actually consumed. When you
assess the performance be sure you are clear on how the
method calculates performance and what the metrics are.
You may want to measure ( and weigh) fuel needed per
cooking cycle rather than use any calculated numbers from
a complex test protocol.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">For evaluation of performance I recommend the
CSI-WHT which is a water heating test (no boiling) and a
measure of the raw fuel needed per replication of the
cooing cycle. It is used by the WB in the Clean Stove
Initiative in Indonesia. Documentation (some anyway) is
available.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Crispin in Tamil Naidu<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
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