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Post by swampzr2 on Dec 19, 2014 5:10:06 GMT -8
So I am redesigning this build. Here are a few things I'm doing, let me know your thoughts.
1. Clip the corners of my heat riser at a 45 degree angle, to increase air flow. So looking down now at the heat riser it isn't square anymore, but rather a deformed octagon. 2. Wrap 1/2" K-wool around feed tube, burn tunnel and heat riser. Wire tie it in tight around the heat riser. 3. Add 2 more 12" clay flue towers and remove the diagonal dividers. 4. The heat will now flow to the top of the first flue, then down the second flue, and finally up the third flue and out the top of the third flue.
Very similar to the dragon heater castle build, except my flues aren't big enough to function as bells I found out.
Will this work?
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Post by patamos on Dec 19, 2014 18:25:33 GMT -8
Is this to day your flues are too narrow to enable effective stratification of gasses? If so that is a good one for all of us to remember. I am assuming this info comes from Sandy, but can you verify the source?
Nevertheless, i would suggest cutting holes between the first two bells before assembly. One at mid height and another between it and the top one. Just in case. You can always block them off with little effort.
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Post by swampzr2 on Dec 31, 2014 12:38:48 GMT -8
Is this to day your flues are too narrow to enable effective stratification of gasses? If so that is a good one for all of us to remember. I am assuming this info comes from Sandy, but can you verify the source? Nevertheless, i would suggest cutting holes between the first two bells before assembly. One at mid height and another between it and the top one. Just in case. You can always block them off with little effort. I determined that my flues were to narrow from trial and error. For a 6" system, you need larger flues that 12" square if you plan on using them for bells. I believe the castle dragon build uses 18" square ones. That being said, since I invested in the flues already, I made use of them. Here is the latest design. Three towers, and the gasses flow up the first (far left), down the second (back behind black steel cylinder) and up and out the last one (far right). So far so good after 2 fires. Now time to wrap them with some stone.
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Post by patamos on Dec 31, 2014 12:52:40 GMT -8
Thanks for the news Swampzr2. That looks like a nice set up Will you be insulating between the flues and walls? Keeping in mind that the flashpoint of combustibles (inside the walls?) gets lower the more often they are subjected to heat...
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Post by DCish on Jan 1, 2015 9:32:12 GMT -8
Per fire code I installed a "heat shield" behind and my box stove when I put it in. Insulation delays heat transfer, but without air gap heat can accumulate over time. On the other hand a piece of sheet metal mounted on spacers 1" out from the wall reflects a great deal of heat and allows for air flow behind it, constantly cooling the wall. Works brilliantly.
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Post by swampzr2 on Jan 5, 2015 8:03:00 GMT -8
Thanks for the news Swampzr2. That looks like a nice set up Will you be insulating between the flues and walls? Keeping in mind that the flashpoint of combustibles (inside the walls?) gets lower the more often they are subjected to heat... I'm not worried about the walls, as the drywall is consistently under 110 degrees F. I am more worried about the hearth under the "j tube". The hearth is slate, then cement board, then sheet metal, then wood studs. As long as I keep a fan moving air under there, it stays cool, but if not it gets to around 150 degrees F. I do have ceramic blankets under the fire brick which is helping, but the air doesn't move under there without a fan.
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Post by patamos on Jan 5, 2015 22:22:00 GMT -8
It would be nice to arrange some kind of passive air flow. Can you jack up the feed-burn tunnels a bit and lay in some more ceramic felt?
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Post by swampzr2 on Jan 7, 2015 10:59:08 GMT -8
It would be nice to arrange some kind of passive air flow. Can you jack up the feed-burn tunnels a bit and lay in some more ceramic felt? I could, but then I have to adjust the heights of the clay flues. I was looking at putting a small computer fan under there to circulate the air. As long as there is some air movement, it stays cool.
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Post by patamos on Jan 7, 2015 22:08:03 GMT -8
I guess that gives you a bit of convection heat as well Some folks were talking about TEG fans a while back in the forum...
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Post by PNW Dave on Jan 7, 2015 23:38:55 GMT -8
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