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Post by pyrophile on Apr 2, 2015 10:35:18 GMT -8
Well, not so appealing... The clean outs are at the bottom of the bell, so you can clean the bell"s bottom, where ashes fall, but you can not clean the bell itself if it gets dirty because of wet wood! Maybe, wet wood would be a bit less a problem if your firebox was already hot, what comes rather fast with a little firebox like in the batch box fired at the beginning with dry wood.
Benoit
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Post by patamos on Apr 3, 2015 21:09:08 GMT -8
Ahh, yes... Maybe we need a super flexible vacuum hose with camera and remote control
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Post by pyrophile on Apr 9, 2015 1:45:55 GMT -8
A cleaning drone!
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Post by patamos on Apr 11, 2015 14:34:48 GMT -8
creosote eating mycelium !?!
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Post by satamax on Apr 11, 2015 23:00:35 GMT -8
creosote eating mycelium !?! What would be amazing, is if thoses mycelia would produce edible mushrooms
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Post by pyrophile on Apr 12, 2015 1:20:59 GMT -8
could be cooked in the stove!
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Post by patamos on Apr 12, 2015 9:27:02 GMT -8
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Post by pyrophile on Apr 12, 2015 14:48:10 GMT -8
I come back with the limits I find in bells... As I already said, I still find them interesting, of course, but I fill more conscious of their limits (in my opinion). I write this because I try to understand if I am right or not, not for polemics. Then fill free to give your comments! Maybe I am repeating myself but I just try to precise or rather clear my thoughts! I think that one of the best way to use bells is to do like Groum-Grzimailo, their "inventor", that is when hot gases arrive in the bell from the bottom of the bell and with a vertical and updraft direction. Gases leave the firebox between 900 and 1000° celsius at level 7 on the schematics and leave the bell , at level 8 at 150 °C then leave the stove at around 100°c, at level 2. In groum-Grzimailo's stove, there is a big place above the firebox (empty in the middle, full of spaced bricks on the sides), almost the two-third of the height of the stove! It's a lot! (Peter did more with his three vertical barrels stove!) In a masonry bell connected to a batch box stove (the term "rocket" is not good owing to me, sorry), gases often enter the bell from the top or hardly the top of the bell, limiting bell's effect as it has been already mentionned. As bell's effect does not occur so well, we add a second bell because one is not enough. But I often noticed that two bells may not be enough neither, sometimes! That's why we, then, add columns and baffles. Bells are not so effective sometimes but they have the advantage to limit the drag. But maybe they don't limit drag only because they don't do their job that well! If they rezally did their job, maybe the draft would fall because of the fall of temperature of the gases? I am not good enough in draft comprehension to know if what I say is stupid or not! Then, in my next batch box stove (later in the year), I will try another kind of gases cooler/accumulator, taking maybe less place than two bells, like this kind : Note the quantity of wood and the rather little system of exchange. Thank you for sharing your doubts, your disagreements or even your agreements! Benoit PS : I will give you temperature measurements when I have the opportunity to test both and so I can compare with the batch box stove I just finished, with bells full of columns and baffles. But this is the end of the season to test the finished one!
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Post by patamos on Apr 18, 2015 10:49:50 GMT -8
Thanks Benoit,
As i have begun to read the stories about Groum Grzimailo, i get the sense that he focused very intently on creating the optimized heater. Although he did not have a gas analyser, he would have discerned much from comparative observations. This much to say, he probably got the dynamics of gas flow and thermal absorption well sorted.
In a sense, the discernment between a 'flue run' and a 'bell' is arbitrary. There is grey area between the two. In those last few diagrams, the bells with baffles and columns look more like fish gills.
Or filters or the alveoli in any animal's lungs… where both maximal flow rate AND surface interface are most important.
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Post by pyrophile on Apr 26, 2015 12:08:44 GMT -8
Many measurements were made during the 20's. His book is very interesting, written in french and english ( before the 20's) and unhappily it doesn't directly deal with stoves. Grum grzimailo built many kilns to fire bricks. IN these kilns, bricks are aligned a bit like this, not exactly and in a more narrow way. I suppose the idea comes from here.
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Post by patamos on Apr 27, 2015 10:27:51 GMT -8
Do you mean the bricks were aligned that way so they could be fired?
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Post by pyrophile on May 3, 2015 0:42:15 GMT -8
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