Ron,<br><br>See comments.<br><br><div class="gmail_quote">On Sat, Mar 3, 2012 at 11:04 AM, Ron Larson <span dir="ltr"><<a href="mailto:rongretlarson@comcast.net" target="_blank">rongretlarson@comcast.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF"><div>Paul and lists</div><div><br></div><div> Congratulations on the new design with a mesh. I think you have achieved the nicest looking flame yet of any stove ever described on this list.</div>
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<p class="MsoNormal">On February 22, 2012 I did three boiling tests.</p><p class="MsoNormal"><br></p>
<p class="MsoNormal">The first test was carried out on a normal propane gas burner that I have in my kitchen.<a href="#135d72f7bad81d52__ftn1" name="135d72f7bad81d52__ftnref1" title=""><span><span><span><span style="font-size:11.0pt;line-height:105%;font-family:"Cambria","serif""></span></span></span></span></a><a href="http://youtu.be/w8OdW_GEhWo" target="_blank"><br>
</a></p><p class="MsoNormal"><a href="http://youtu.be/w8OdW_GEhWo" target="_blank">http://youtu.be/w8OdW_GEhWo</a> <br></p><p class="MsoNormal">Here it took 6 minutes and 6 seconds to bring one liter of water to a boil. <br>
</p><p class="MsoNormal">
The
burner shown in this video is a very efficient premix gas burner. <br></p><p class="MsoNormal">But since it operates solely
by means of convection, its performance is not optimal.</p><p class="MsoNormal"><br></p>
<p class="MsoNormal">
The second test was carried out using the 150 gasifier:<a href="#135d72f7bad81d52__ftn2" name="135d72f7bad81d52__ftnref2" title=""><span><span><span><span style="font-size:11pt;line-height:105%;font-family:"Cambria","serif""><br>
</span></span></span></span></a></p><p class="MsoNormal"><a href="#135d72f7bad81d52__ftn2" name="135d72f7bad81d52__ftnref2" title=""><span><span><span><span style="font-size:11.0pt;line-height:105%;font-family:"Cambria","serif""></span></span></span></span></a> <a href="http://youtu.be/jK3UTe1Lxqk" target="_blank">http://youtu.be/jK3UTe1Lxqk</a></p>
<p class="MsoNormal">Here it took 3 minutes and 42 seconds to bring one liter of water to a boil. <br></p><p class="MsoNormal">Note that the same pan without a lid was used in these two boiling tests.</p><p class="MsoNormal">
Here heat is transferred by both convection and thermal radiation.</p><p class="MsoNormal"><br></p><p class="MsoNormal">The third test was carried out using an insulated electric
water kettle, as shown here:</p><p class="MsoNormal"><a href="http://dl.dropbox.com/u/22013094/150%20Gasifier/Boiling/IMG_1042.JPG" target="_blank">http://dl.dropbox.com/u/22013094/150%20Gasifier/Boiling/IMG_1042.JPG</a></p>
<p class="MsoNormal">
Here it took 3 minutes and 25 seconds to bring
one liter of water to a boil. </p><p class="MsoNormal"> In this way I was able to compare the
two previous results</p><p class="MsoNormal"> with what could be considered to be the fastest way to
boil water in a kitchen setting. <br></p> <br><div><br>
</div><div></div><div><br></div><div> I wonder if you have found any technical design literature for this added radiative mesh? (Materials, wire diameters and spacing, etc?)</div>
</div><div><br>I have no theoretical understanding with regard to what is happening with the wire mesh dome.<br>I tried flat wire mesh, and this did not work at all.<br>The wire mesh has to be in the form of a dome to accommodate the small diffusion tail that you see here:<br>
<span style="font-size:11.0pt;line-height:115%;font-family:"Calibri","sans-serif""><a href="http://youtu.be/WXZvvoxCm1g" target="_blank">http://youtu.be/WXZvvoxCm1g</a></span><br><br>I tried wire meshes of various apertures.<br>
If the aperture of the wire mesh is too big, the flames are not contained properly under the dome.<br>If the burning of gases takes place above the dome, the dome does not turn red hot.<br>This week I will experiment with much finer wires and apertures.<br>
<br>Also, if I turn down the primary air to a point where much less gas is produced,<br> combustion no longer takes place at the burner holes but within the apex of the dome.<br>Here a most unusual but stable cloud of burning gases is formed.<br>
<br>The wire mesh dome quite nicely protects the gas being combusted from disturbance by the wind.<br>Previously when the wind would hit the burner without the wire mesh dome, it would move the flames in all directions.<br>
Often it left in its wake a lot of unburned gases.<br><br>I think that thermal radiation travels down to the burner and keeps it hotter than before.<br>I suppose that as hot gases hug the underside of the red hot dome,<br>
gas temperature prior to combustion is higher than before.<br><br><p class="MsoNormal">The wire mesh dome not only emits thermal radiation,</p><p class="MsoNormal">but it also traps fine cinders that are emitted by the burner.<br>
</p><br>It will take many more months of experimenting and testing to understand a bit better what is happening here.<br><br>Thanks.<br>Paul Olivier<br><br></div><blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF"><div><br></div>
<div> To list readers, I strongly recommend the report given below, as well as the videos. There are some impressive Biochar field results as well as stove results. For this reason, I am also forwarding this to the (general) Biochar list.</div>
<div><br></div><div>Ron</div><div><div><div><br><br></div><div><br>On Mar 2, 2012, at 4:11 PM, Paul Olivier <<a href="mailto:paul.olivier@esrla.com" target="_blank">paul.olivier@esrla.com</a>> wrote:<br><br>
</div><div></div><blockquote type="cite"><div>This is a TLUD forced air gasifier in operation on rice hulls.<br><br>
Here you see the burner with burner housing:<br>
<span style="font-size:11pt;line-height:115%;font-family:"Calibri","sans-serif""><a href="http://www.youtube.com/watch?v=nZDt8DfgSls&feature=channel" target="_blank"></a><a href="http://www.youtube.com/watch?v=nZDt8DfgSls&feature=channel" target="_blank">http://www.youtube.com/watch?v=nZDt8DfgSls&feature=channel</a><br>
</span><span style="font-size:11pt;line-height:115%;font-family:"Calibri","sans-serif""><a href="http://youtu.be/WXZvvoxCm1g" target="_blank"></a><a href="http://youtu.be/WXZvvoxCm1g" target="_blank">http://youtu.be/WXZvvoxCm1g</a><br>
<br>
When a wire mesh dome is placed on top of the burner and burner housing, <br> this roughly doubles the amount of heat being transferred to a pot:<br>
</span><span style="font-size:11pt;line-height:115%;font-family:"Calibri","sans-serif""><a href="http://youtu.be/7fnGem9BQ7Q" target="_blank"></a><a href="http://youtu.be/7fnGem9BQ7Q" target="_blank">http://youtu.be/7fnGem9BQ7Q</a><br>
</span><span style="font-size:11.0pt;line-height:115%;font-family:"Calibri","sans-serif""><a href="http://youtu.be/yO3jcbQj-GI" target="_blank"></a><a href="http://youtu.be/yO3jcbQj-GI" target="_blank">http://youtu.be/yO3jcbQj-GI</a></span><br>
<span style="font-size:11.0pt;line-height:115%;font-family:"Calibri","sans-serif""><a href="http://youtu.be/2c6A6BVitpE" target="_blank"></a><a href="http://youtu.be/2c6A6BVitpE" target="_blank">http://youtu.be/2c6A6BVitpE</a></span><br>
<br>Here it took 3 minutes and 42 seconds to bring a liter of water to a boil:<br>
<span style="font-size:11pt;line-height:115%;font-family:"Calibri","sans-serif""><a href="http://youtu.be/jK3UTe1Lxqk" target="_blank"></a><a href="http://youtu.be/jK3UTe1Lxqk" target="_blank">http://youtu.be/jK3UTe1Lxqk</a><br>
</span><span style="font-size:11.0pt;line-height:115%;font-family:"Calibri","sans-serif""><a href="http://youtu.be/80REBVTwpMo" target="_blank"></a><a href="http://youtu.be/80REBVTwpMo" target="_blank">http://youtu.be/80REBVTwpMo</a></span><br>
<br>For more details on this gasifier, see:<br>
<a href="http://esrla.com/pdf/landfill_06.pdf" target="_blank"></a><a href="http://esrla.com/pdf/landfill_06.pdf" target="_blank">http://esrla.com/pdf/landfill_06.pdf</a> <br><br>Thanks.<br>Paul<br><br>-- <br>Paul A. Olivier PhD<br>
27C Pham Hong Thai Street<br>Dalat<br>Vietnam<br><br>Louisiana telephone: 1-337-447-4124 (rings Vietnam)<br>
Mobile: 090-694-1573 (in Vietnam)<br>Skype address: Xpolivier<br><a href="http://www.esrla.com/" target="_blank"></a><a href="http://www.esrla.com/" target="_blank">http://www.esrla.com/</a><br>
</div></blockquote></div></div><blockquote type="cite"><div><span>_______________________________________________</span><br><span>Stoves mailing list</span><br><span></span><br><span>to Send a Message to the list, use the email address</span><br>
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</div></blockquote></div></blockquote></div><br><br clear="all"><br>-- <br>Paul A. Olivier PhD<br>27C Pham Hong Thai Street<br>Dalat<br>Vietnam<br><br>Louisiana telephone: 1-337-447-4124 (rings Vietnam)<br>Mobile: 090-694-1573 (in Vietnam)<br>
Skype address: Xpolivier<br><a href="http://www.esrla.com/" target="_blank">http://www.esrla.com/</a><br>