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Post by Donkey on Aug 4, 2013 23:08:40 GMT -8
I like the look of that.. I wonder, will an earthen plaster stick to those tiles? Perhaps you could try a heavy sand/clay plaster, something a little sculpt-able.. A sandier plaster will increase thermal mass, adding chopped straw/horse manure side (depending) would slightly insulate. Perhaps you could tune the stove AND make it beautiful at the same time. ??
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Post by endrunner on Aug 5, 2013 9:24:52 GMT -8
When we quit tearing the thing apart and modifying this and that, we will be covering it with something. Our thought at the moment is we will use stacked stone.
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Post by peterberg on Aug 5, 2013 11:04:21 GMT -8
I wonder, will an earthen plaster stick to those tiles? I would think it'll stand a good chance. It is earthenware, it could be tested on a large red clay flowerpot. Plaster got the advantage of direct conduction and is as such a way to make the outer layer of the bell much thicker.
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Post by endrunner on Aug 8, 2013 20:44:39 GMT -8
We replaced the fire clay brick in the heat riser exhaust channel with 1" ceramic blanket. It did just what we were hopping for. - It increase the exit to the chimney temperatures, so that they got to 150- 160 much quicker and remained at that level through out the burn
- Increased the temperatures in the 1st bell by 30F
- Reduced the outside temperature of the heat riser to a maximum of around 180
We additionally left the data logger on for another 4 hours, so it tracked hours 2-6 after there was no more fresh fuel, only remaining coals. As you can see in the post, 6 hours later, the inside of the 1st bell is still over 130F. I am sure a full scale masonry heater would hold heat even better, but for the quick build and ease of construction, it seems like a nice compromise. blog.dragonheaters.com/wp-content/uploads/2013/08/outsidebells2nd4hrs3rdbuild.jpgAttachments:
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Post by endrunner on Aug 9, 2013 6:03:30 GMT -8
I forgot to mention that we did have the infamous "pulse mode" for about 90 seconds! I had never seen it before, I was SO EXCITED, but I moved the wood and could not get it back. Oh well.
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Post by peterberg on Aug 9, 2013 6:46:49 GMT -8
<grin> When this mode occurs, you know for sure it's the real thing, no boubt about that. <grin off> So... this is a 6 incher with not much room directly above the riser. The stove is outside, probably no chimney stack worth to mention except for a bare stove pipe. I do think it won't work outside specific circumstances plus the operator have to know how to do it. I'm surprised, this stove has to have a strong draw by itself, otherwise it won't enter this mode.
The tunnel ought to be very hot, the feed stuffed full of thin, dry and soft wood. When it occurred at first, it lasted for a minute or so until I knew how to induce it. A couple of dozen of instances later I could get it going more or less at will within about 15 minutes, started from cold.
Edit: No fuel, wood either charcoal further downstream in the tunnel, otherwise it won't enter pulse mode.
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Post by endrunner on Aug 22, 2013 13:10:07 GMT -8
So here is the build with some stacked stone and such... Attachments:
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Post by Donkey on Aug 22, 2013 16:03:41 GMT -8
That's purty!! Nice job!
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Post by satamax on Aug 23, 2013 8:48:00 GMT -8
Yep, nicee un!
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Post by wrekinwanderer on Sept 6, 2013 11:50:47 GMT -8
Beautiful build Endrunner, very inspiring.
I was wondering about using the double wall chimney liners as seen in Satamax's post, and filling the space with perlite in place of the ceramic blanket....
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Post by endrunner on Sept 7, 2013 6:00:22 GMT -8
Can you provide a link to the satamax post?
The ceramic blanket is only above the heat riser to protect the flue as the heat goes into the bell. Insulation between the flues will not help and you don't want insulation between the flues in the 1st bell, if anything, you want mass of some kind.
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Post by satamax on Sept 7, 2013 7:06:22 GMT -8
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Post by endrunner on Sept 7, 2013 7:22:59 GMT -8
Thanks, I would think they still have to be split for inner flue positions. We don't have that style here.
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Post by satamax on Sept 7, 2013 8:02:28 GMT -8
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Post by wrekinwanderer on Sept 8, 2013 13:03:57 GMT -8
The sizes I've seen here have an interior dimensions of 20x20, 25x25 or 30x30cms. Do you think the 30x30 would work for a 5" system or a bit small?
The pozzolan ones look interesting. I wonder how much more expensive they would be, will find out...
I also wonder how much heat do you think would come off a bell made of them, any thoughts? I think the wall is 5cms of Pozzolan...
Endrunner, I'm interested, how do you fix the ceramic blanket to the wall? Also, do you think they would have to be split for inner flue positions because the outer layer would crack with the heat if unprotected?
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