<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Dear Fabian</div><div><br></div><div>You can measure the absolute Water content of wood by weighing a chip, heating to 120 C for an hour, and then re weighing. The loss in weight is the water content. 120C is low enough so that you don't destroy any of the cellular structure, and high enough to guarantee "bone dry". </div><div><br></div><div>Tom Rees<br><br>Thomas B Reed<span class="Apple-style-span" style="-webkit-tap-highlight-color: rgba(26, 26, 26, 0.296875); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469); "> </span><div><span class="Apple-style-span" style="-webkit-tap-highlight-color: rgba(26, 26, 26, 0.292969); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469);"><br></span></div></div><div><br>On May 22, 2013, at 1:35 AM, "Fabian Schmid" <<a href="mailto:fabi.klotz@web.de">fabi.klotz@web.de</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="font-family: Verdana;font-size: 12.0px;"><div>
<div>Hey Stephen,</div>
<div> </div>
<div>thanks for your hint with the moisture content curve, we also thought about drying only to a content which can be reached with air drying and then estimating this content with such diaramms.</div>
<div> </div>
<div>But on the other side we never can be sure about the exact value of the moisture content, regardless of which influence it really has on the themro chemical conversion process inside a gasifier.</div>
<div> </div>
<div>But when you`re doing a water boiling test it makes a difference in your results if you estimated the content only a littel bit wrong.</div>
<div> </div>
<div>As our aim is to have exact results to compare stoves we really search for a possibility of minimize this error.</div>
<div> </div>
<div>Grettings</div>
<div> </div>
<div> </div>
<div>Fabian</div>
<div> </div>
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<div style="margin:0 0 10px 0;"><b>Gesendet:</b> Donnerstag, 16. Mai 2013 um 14:44 Uhr<br>
<b>Von:</b> <a href="mailto:sabbadess@aol.com">sabbadess@aol.com</a><br>
<b>An:</b> <a href="mailto:gasification@lists.bioenergylists.org">gasification@lists.bioenergylists.org</a><br>
<b>Cc:</b> <a href="mailto:troy@offgridpro.com">troy@offgridpro.com</a>, <a href="mailto:jared@offgridpro.com">jared@offgridpro.com</a><br>
<b>Betreff:</b> Re: [Gasification] measuring moisture content</div>
<div name="quoted-content">
<div><font color="black" face="arial" size="2">Hi Fabian,</font></div>
<div><font color="black" face="arial" size="2"> </font></div>
<div><font color="black" face="arial" size="2">I hope you can see the image below:</font></div>
<div><font color="black" face="arial" size="2"> </font></div>
<div><font color="black" face="arial" size="2"><img alt="Chip Drying" src="http://xa.yimg.com/kq/groups/12621392/sn/1702978905/name/chip_drying.jpg"></font></div>
<div><font color="black" face="arial" size="2"> </font></div>
<div><font color="black" face="arial" size="2">The drying issue is not that big a deal. I found that with large wood chips from a tractor chipper that the chips are suitable for gasification after 5 day in still air if they are stirred daily. If you can buffer five days worth of fuel you can eliminate the dryer completely. I suspect many sliced or fractured fuels of the same or lesser volume will dry in the same amount of time.</font></div>
<div><font color="black" face="arial" size="2"> </font></div>
<div><font color="black" face="arial" size="2">I have already produced a personal scale gasifier for cooking shown below:</font></div>
<div><font color="black" face="arial" size="2"> </font></div>
<div><font color="black" face="arial" size="2"><img alt="Anastasia Gasifier" src="http://xa.yimg.com/kq/groups/12621392/sn/396184897/name/anastasia.jpg"></font></div>
<div><font color="black" face="arial" size="2"> </font></div>
<div><font color="black" face="arial" size="2">You can see it boiling a pot of water here:</font></div>
<div><font color="black" face="arial" size="2"> </font></div>
<div><font color="black" face="arial" size="2"><a href="http://www.youtube.com/watch?v=m5uMUi3zzqU" target="_blank">http://www.youtube.com/watch?v=m5uMUi3zzqU</a></font></div>
<div><font color="black" face="arial" size="2"> </font></div>
<div><font color="black" face="arial" size="2"><a href="http://www.youtube.com/watch?v=MbEeRm1Dmgw" target="_blank">http://www.youtube.com/watch?v=MbEeRm1Dmgw</a></font></div>
<div><font color="black" face="arial" size="2"> </font></div>
<div><font color="black" face="arial" size="2">It runs on a 35W air pump that can be driven by a solar panel. I also have a larger unit that could feed multiple homes in the developing world from a single solar PV panel. I will be shipping units in the next month.</font></div>
<div><font color="black" face="arial" size="2"> </font></div>
<div><font color="black" face="arial" size="2">Let me know if I can be of any help.</font></div>
<div><font color="black" face="arial" size="2"> </font></div>
<div><font color="black" face="arial" size="2">Stephen Abbaddessa</font></div>
<div style="FONT-FAMILY: arial , helvetica;COLOR: black;FONT-SIZE: 10.0pt;"><font color="black" face="arial" size="2">-----Original Message-----<br>
From: Fabian Schmid <<a href="mailto:fabi.klotz@web.de">fabi.klotz@web.de</a>><br>
To: gasification <<a href="mailto:gasification@lists.bioenergylists.org">gasification@lists.bioenergylists.org</a>><br>
Sent: Thu, May 16, 2013 7:04 am<br>
Subject: [Gasification] measuring moisture content</font><br>
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<div><font color="black" face="arial" size="2">Hello everybody,</font></div>
<div><font color="black" face="arial" size="2"> </font></div>
<div><font color="black" face="arial" size="2">our project "efficient cooking in Tanzania", realized of engineers without borders, Berlin and CHEMA, Tanzania wants to design different microgasifiers for cooking using a broad range of biomass.</font></div>
<div><font color="black" face="arial" size="2"> </font></div>
<div><font color="black" face="arial" size="2">We want to measure the moisture content of different biomass, including sawdust, coffee husks and wood logs for the exact evaluation of microgasifier WBTs.</font></div>
<div><font color="black" face="arial" size="2">Till now we estimated the content but want to have more scientific results for a better comparison to other micogasifiers.</font></div>
<div><font color="black" face="arial" size="2"> </font></div>
<div><font color="black" face="arial" size="2">As our project is situated in Kagera, Tanzania there aren`t any electrical devices like a drying stove or a microwave, we also don`t want to buy a expensive moisture device. We think of heating the sample above a microgasifier (Sawdust stove or Mwoto TLUD) or heating it with steam from a boiled water pot to achieve the 106°C.</font></div>
<div><font color="black" face="arial" size="2">We want to conduct the WBTs in Tanzania, because it isn`t possibel to get comparabel fuels in Berlin, Germany.</font></div>
<div><font color="black" face="arial" size="2"> </font></div>
<div><font color="black" face="arial" size="2">Are there any experiences regarding this problem?</font></div>
<div><font color="black" face="arial" size="2">Do you have any hints?</font></div>
<div><font color="black" face="arial" size="2"> </font></div>
<div><font color="black" face="arial" size="2">Thanks a lot!</font></div>
<div><font color="black" face="arial" size="2"> </font></div>
<div><font color="black" face="arial" size="2">Gaifiers ahead.</font></div>
<div><font color="black" face="arial" size="2"> </font></div>
<div><font color="black" face="arial" size="2">Fabi</font></div>
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