<p>What was the fuel?</p>
<div class="gmail_quote">On 2012-04-17 6:24 PM, "Crispin Pemberton-Pigott" <<a href="mailto:crispinpigott@gmail.com">crispinpigott@gmail.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div lang="EN-CA" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Dear Friends<u></u><u></u></span></p><p class="MsoNormal">
<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">We have been conducting a series of thermal efficiency tests on three stoves, more than 50 altogether, and I am sharing a consistently good result from two of them. Here is one:<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Thermal Efficiency<u></u><u></u></span></p>
<table border="0" cellspacing="0" cellpadding="0" width="144" style="width:108.0pt;border-collapse:collapse"><tr style="min-height:14.25pt"><td width="72" nowrap valign="bottom" style="width:54.0pt;border:none;border-top:solid windowtext 1.0pt;background:#ccc0da;padding:0mm 5.4pt 0mm 5.4pt;min-height:14.25pt">
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">66.7%<u></u><u></u></span></p></td><td width="72" nowrap valign="bottom" style="width:54.0pt;border-top:solid windowtext 1.0pt;border-left:none;border-bottom:none;border-right:solid windowtext 1.0pt;background:#ccc0da;padding:0mm 5.4pt 0mm 5.4pt;min-height:14.25pt">
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">67.1%<u></u><u></u></span></p></td></tr><tr style="min-height:14.25pt"><td width="72" nowrap valign="bottom" style="width:54.0pt;background:#ccc0da;padding:0mm 5.4pt 0mm 5.4pt;min-height:14.25pt">
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">67.1%<u></u><u></u></span></p></td><td width="72" nowrap valign="bottom" style="width:54.0pt;border:none;border-right:solid windowtext 1.0pt;background:#ccc0da;padding:0mm 5.4pt 0mm 5.4pt;min-height:14.25pt">
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:11.0pt;font-family:"Arial","sans-serif""> <u></u><u></u></span></p></td></tr><tr style="min-height:14.25pt"><td width="72" nowrap valign="bottom" style="width:54.0pt;border:none;border-bottom:solid windowtext 1.0pt;background:#ccc0da;padding:0mm 5.4pt 0mm 5.4pt;min-height:14.25pt">
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">67.6%<u></u><u></u></span></p></td><td width="72" nowrap valign="bottom" style="width:54.0pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;background:#ccc0da;padding:0mm 5.4pt 0mm 5.4pt;min-height:14.25pt">
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:11.0pt;font-family:"Arial","sans-serif""> <u></u><u></u></span></p></td></tr></table><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">That was achieved at about 2 kW power level.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">The other was at a similar level:<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Thermal efficiency<u></u><u></u></span></p><table border="0" cellspacing="0" cellpadding="0" width="144" style="width:108.0pt;border-collapse:collapse">
<tr style="min-height:14.25pt"><td width="72" nowrap valign="bottom" style="width:54.0pt;background:#ccc0da;padding:0mm 5.4pt 0mm 5.4pt;min-height:14.25pt"><p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">73.0%<u></u><u></u></span></p>
</td><td width="72" nowrap valign="bottom" style="width:54.0pt;background:#ccc0da;padding:0mm 5.4pt 0mm 5.4pt;min-height:14.25pt"><p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">71.3%<u></u><u></u></span></p>
</td></tr><tr style="min-height:14.25pt"><td width="72" nowrap valign="bottom" style="width:54.0pt;background:#ccc0da;padding:0mm 5.4pt 0mm 5.4pt;min-height:14.25pt"><p class="MsoNormal" align="center" style="text-align:center">
<span style="font-size:11.0pt;font-family:"Arial","sans-serif"">70.8%<u></u><u></u></span></p></td><td width="72" nowrap valign="bottom" style="width:54.0pt;background:#ccc0da;padding:0mm 5.4pt 0mm 5.4pt;min-height:14.25pt">
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:11.0pt;font-family:"Arial","sans-serif""> <u></u><u></u></span></p></td></tr><tr style="min-height:14.25pt"><td width="72" nowrap valign="bottom" style="width:54.0pt;background:#ccc0da;padding:0mm 5.4pt 0mm 5.4pt;min-height:14.25pt">
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">69.9%<u></u><u></u></span></p></td><td width="72" nowrap valign="bottom" style="width:54.0pt;background:#ccc0da;padding:0mm 5.4pt 0mm 5.4pt;min-height:14.25pt">
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:11.0pt;font-family:"Arial","sans-serif""> <u></u><u></u></span></p></td></tr></table><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I am pretty sure I have not seen this for a high power level before. Very low power can achieve high efficiencies but it is not a very useful heat. With these two we are seeing 1.4 kW absorbed into the pot. Pretty impressive.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I will ask permission to share the data for what will be 69 tests in all.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">One set involved repeating a test done in another country with a similar though not identical protocol. The result was within 2.3% so the approaches are getting comparable results. Given that the fuel was not identical, altitude difference and not exactly the same pot, the difference is negligible.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Other lab (recalculated to correct a minor error)<u></u><u></u></span></p>
<table border="0" cellspacing="0" cellpadding="0" width="144" style="width:108.0pt;border-collapse:collapse"><tr style="min-height:14.25pt"><td width="72" nowrap valign="bottom" style="width:54.0pt;border-top:solid windowtext 1.0pt;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:none;background:#ccc0da;padding:0mm 5.4pt 0mm 5.4pt;min-height:14.25pt">
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">69.4%<u></u><u></u></span></p></td><td width="72" nowrap valign="bottom" style="width:54.0pt;border:solid windowtext 1.0pt;border-left:none;background:#ccc0da;padding:0mm 5.4pt 0mm 5.4pt;min-height:14.25pt">
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">69.4%<u></u><u></u></span></p></td></tr></table><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">SeTAR Lab with a slightly smaller pot and 1.1 litres less water in it<u></u><u></u></span></p><table border="0" cellspacing="0" cellpadding="0" width="144" style="width:108.0pt;border-collapse:collapse">
<tr style="min-height:14.25pt"><td width="72" nowrap valign="bottom" style="width:54.0pt;border:none;border-top:solid windowtext 1.0pt;background:#ccc0da;padding:0mm 5.4pt 0mm 5.4pt;min-height:14.25pt"><p class="MsoNormal" align="center" style="text-align:center">
<span style="font-size:11.0pt;font-family:"Arial","sans-serif"">66.7%<u></u><u></u></span></p></td><td width="72" nowrap valign="bottom" style="width:54.0pt;border-top:solid windowtext 1.0pt;border-left:none;border-bottom:none;border-right:solid windowtext 1.0pt;background:#ccc0da;padding:0mm 5.4pt 0mm 5.4pt;min-height:14.25pt">
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">67.1%<u></u><u></u></span></p></td></tr><tr style="min-height:14.25pt"><td width="72" nowrap valign="bottom" style="width:54.0pt;background:#ccc0da;padding:0mm 5.4pt 0mm 5.4pt;min-height:14.25pt">
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">67.1%<u></u><u></u></span></p></td><td width="72" nowrap valign="bottom" style="width:54.0pt;border:none;border-right:solid windowtext 1.0pt;background:#ccc0da;padding:0mm 5.4pt 0mm 5.4pt;min-height:14.25pt">
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:11.0pt;font-family:"Arial","sans-serif""> <u></u><u></u></span></p></td></tr><tr style="min-height:14.25pt"><td width="72" nowrap valign="bottom" style="width:54.0pt;border:none;border-bottom:solid windowtext 1.0pt;background:#ccc0da;padding:0mm 5.4pt 0mm 5.4pt;min-height:14.25pt">
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">67.6%<u></u><u></u></span></p></td><td width="72" nowrap valign="bottom" style="width:54.0pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;background:#ccc0da;padding:0mm 5.4pt 0mm 5.4pt;min-height:14.25pt">
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:11.0pt;font-family:"Arial","sans-serif""> <u></u><u></u></span></p></td></tr></table><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">It is nice to see this performance level achieved consistently. We are seeing a consistent performance variation with pot diameter: bigger is better.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Regards<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Crispin<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
</div></div><br>_______________________________________________<br>
Stoves mailing list<br>
<br>
to Send a Message to the list, use the email address<br>
<a href="mailto:stoves@lists.bioenergylists.org">stoves@lists.bioenergylists.org</a><br>
<br>
to UNSUBSCRIBE or Change your List Settings use the web page<br>
<a href="http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org" target="_blank">http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org</a><br>
<br>
for more Biomass Cooking Stoves,  News and Information see our web site:<br>
<a href="http://www.bioenergylists.org/" target="_blank">http://www.bioenergylists.org/</a><br>
<br>
<br></blockquote></div>