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Cob: RE: Re: masonary heaterPatrick Newberry PNewberry at HFHI.orgMon Jan 14 07:27:08 CST 2002
I just finished my "cob" masonry heater. Actually I'm not sure what I should call it, but that sounds as good as anything. basically I took a mexican ceramic "patio" heater, stuck six inch stove pipe in the top and ran it out my school bus / bedroom. The first thing I noticed is that yup, it takes longer to heat now. Only have fired it up once so far. It has about 6 to 8 inches of cob around the ceramic pot, I'll take some photos at some point. It draws really nice. the flue / 6 inch pipe takes a 90 turn at the top of the heater, goes a bit vertical for about 4 feet, then another 90 degree turn, about a two more feet, out the bus window, another 90 degree turn to the right, (to the bus outside mirror) the 90 degrees up for two 6 inche stove pipe sections. the cob stops a the top of the stove and the rest is just stove pipe. It's been a bit warm the last few days and will give her another test when the next cold spell hits middle GA. maybe I can coordinate the photos and the cold spell together ! L&L Pat www.gypsyfarm.com -----Original Message----- From: Robert Bolman [mailto:robtb at efn.org] Sent: Wednesday, January 09, 2002 5:11 AM To: Roger Entwistle; coblist at deatech.com Subject: Cob: Re: masonary heater I've been looking at some stuff on the mha website, ( www.mha-net.org) that talks about masonary heaters in Belarus constructed using clay/earth. Has anybody any info/experience of building masonary style heaters using cob or similar techniques? A number of people have done heated cob benches which I've always seen as a poor persons's masonry heater. They use a rocket stove type design to do the initial combustion and then run the combustion gases through (typically) six inch stove pipe embedded in the bench after which it goes up and ultimately exits the building. My understanding is that they suffer from a few problems. For one thing they can draw very poorly because of all that horizontal flu. Also, I understand that six inch round stove pipe isn't the most conducive shape to transfer the heat to the cob. Now that we're "post Y2K", I want to design a heated cob bench using a little blower to facilitate the combustion within a cast refractory "rocket elbow". Then I would plan on smaller diameter pipe traveling a greater distance to fully transfer the heat into the cob. Rob -------------- next part -------------- <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <META content="MSHTML 5.00.2919.6307" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT color=#0000ff face=Arial size=2><SPAN class=657352713-14012002>I just finished my "cob" masonry heater. Actually I'm not sure what I should call it, but that sounds as good as anything. </SPAN></FONT></DIV> <DIV><FONT color=#0000ff face=Arial size=2><SPAN class=657352713-14012002>basically I took a mexican ceramic "patio" heater, stuck six inch stove pipe in the top and ran it out my school bus / bedroom. </SPAN></FONT></DIV> <DIV><FONT color=#0000ff face=Arial size=2><SPAN class=657352713-14012002></SPAN></FONT> </DIV> <DIV><FONT color=#0000ff face=Arial size=2><SPAN class=657352713-14012002>The first thing I noticed is that yup, it takes longer to heat now. Only have fired it up once so far. It has about 6 to 8 inches of cob around the ceramic </SPAN></FONT></DIV> <DIV><FONT color=#0000ff face=Arial size=2><SPAN class=657352713-14012002>pot, I'll take some photos at some point. It draws really nice. the flue / 6 inch pipe takes a 90 turn at the top of the heater, goes a bit vertical for about </SPAN></FONT></DIV> <DIV><FONT color=#0000ff face=Arial size=2><SPAN class=657352713-14012002>4 feet, then another 90 degree turn, about a two more feet, out the bus window, another 90 degree turn to the right, (to the bus outside mirror) the 90 </SPAN></FONT></DIV> <DIV><FONT color=#0000ff face=Arial size=2><SPAN class=657352713-14012002>degrees up for two 6 inche stove pipe sections. </SPAN></FONT></DIV> <DIV><FONT color=#0000ff face=Arial size=2><SPAN class=657352713-14012002></SPAN></FONT> </DIV> <DIV><FONT color=#0000ff face=Arial size=2><SPAN class=657352713-14012002>the cob stops a the top of the stove and the rest is just stove pipe. </SPAN></FONT></DIV> <DIV><FONT color=#0000ff face=Arial size=2><SPAN class=657352713-14012002></SPAN></FONT> </DIV> <DIV><FONT color=#0000ff face=Arial size=2><SPAN class=657352713-14012002>It's been a bit warm the last few days and will give her another test when the next cold spell hits middle GA. </SPAN></FONT></DIV> <DIV><FONT color=#0000ff face=Arial size=2><SPAN class=657352713-14012002></SPAN></FONT> </DIV> <DIV><FONT color=#0000ff face=Arial size=2><SPAN class=657352713-14012002>maybe I can coordinate the photos and the cold spell together !</SPAN></FONT></DIV> <DIV><FONT color=#0000ff face=Arial size=2><SPAN class=657352713-14012002></SPAN></FONT> </DIV> <DIV><FONT color=#0000ff face=Arial size=2><SPAN class=657352713-14012002>L&L</SPAN></FONT></DIV> <DIV><FONT color=#0000ff face=Arial size=2><SPAN class=657352713-14012002>Pat </SPAN></FONT></DIV> <DIV><FONT color=#0000ff face=Arial size=2><SPAN class=657352713-14012002><A href="http://www.gypsyfarm.com">www.gypsyfarm.com</A></SPAN></FONT></DIV> <DIV><FONT color=#0000ff face=Arial size=2><SPAN class=657352713-14012002></SPAN></FONT> </DIV> <BLOCKQUOTE style="MARGIN-RIGHT: 0px"> <DIV align=left class=OutlookMessageHeader dir=ltr><FONT face=Tahoma size=2>-----Original Message-----<BR><B>From:</B> Robert Bolman [mailto:robtb at efn.org]<BR><B>Sent:</B> Wednesday, January 09, 2002 5:11 AM<BR><B>To:</B> Roger Entwistle; coblist at deatech.com<BR><B>Subject:</B> Cob: Re: masonary heater<BR><BR></DIV></FONT> <BLOCKQUOTE style="BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; PADDING-LEFT: 5px"> <DIV><FONT size=3>I've been looking at some stuff on the mha website, (<A href="http://www.mha-net.org">www.mha-net.org</A>) that talks about masonary heaters in Belarus constructed using clay/earth.</FONT></DIV> <DIV><FONT size=3>Has anybody any info/experience of building masonary style heaters using cob or similar techniques?</FONT></DIV> <DIV><FONT size=3></FONT> </DIV> <DIV><FONT size=3>A number of people have done heated cob benches which I've always seen as a poor persons's masonry heater. They use a rocket stove type design to do the initial combustion and then run the combustion gases through (typically) six inch stove pipe embedded in the bench after which it goes up and ultimately exits the building.</FONT></DIV> <DIV><FONT size=3></FONT> </DIV> <DIV><FONT size=3>My understanding is that they suffer from a few problems. For one thing they can draw very poorly because of all that horizontal flu. Also, I understand that six inch round stove pipe isn't the most conducive shape to transfer the heat to the cob.</FONT></DIV> <DIV><FONT size=3></FONT> </DIV> <DIV><FONT size=3>Now that we're "post Y2K", I want to design a heated cob bench using a little blower to facilitate the combustion within a cast refractory "rocket elbow". Then I would plan on smaller diameter pipe traveling a greater distance to fully transfer the heat into the cob.</FONT></DIV> <DIV><FONT size=3></FONT> </DIV> <DIV><FONT face="" size=3>Rob</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>
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