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Thanks Paul for the clarification and opportunities. In many places saving a bit of firewood is not a priority, much as we fuel-parsimonious fanatics would prefer. </div>
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Regards </div>
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Crispin </div>
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<div><b>From: </b>Paul Anderson</div>
<div><b>Sent: </b>Tuesday, September 16, 2014 09:55</div>
<div><b>To: </b>Discussion of biomass cooking stoves</div>
<div><b>Reply To: </b>Discussion of biomass cooking stoves</div>
<div><b>Subject: </b>Re: [Stoves] cook stoves for Cameroon</div>
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<div class="x_moz-cite-prefix">Huck,<br>
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Crispin wrote:<br>
<blockquote type="cite"><span lang="EN-US" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">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>
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Paul<br>
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<pre class="x_moz-signature" cols="72">Doc / Dr TLUD / Prof. Paul S. Anderson, PhD
Email: <a class="x_moz-txt-link-abbreviated" href="mailto:psanders@ilstu.edu">psanders@ilstu.edu</a>
Skype: paultlud Phone: +1-309-452-7072
Website: <a class="x_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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<p class="x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Dear Huck</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Just one quick point:</span></p>
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<p class="x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">“</span><span lang="EN-US" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">The gasifier, as I understand it, is more efficient
and has lower emissions.”</span></p>
<p class="x_MsoNormal"><span lang="EN-US" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
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<p class="x_MsoNormal"><span lang="EN-US" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">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 lang="EN-US" style="font-size:13.5pt; font-family:"Helvetica","sans-serif""></span></p>
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<p class="x_MsoNormal"><span lang="EN-US" style="color:#1F497D"> </span></p>
<p class="x_MsoNormal"><span lang="EN-US" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">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.</span></p>
<p class="x_MsoNormal"><span lang="EN-US" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="x_MsoNormal"><span lang="EN-US" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">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.</span></p>
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<p class="x_MsoNormal"><span lang="EN-US" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Regards</span></p>
<p class="x_MsoNormal"><span lang="EN-US" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Crispin in Tamil Naidu</span></p>
<p class="x_MsoNormal"><span lang="EN-US" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
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