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Post by landlubber on Dec 19, 2020 5:53:04 GMT -8
hello i'm new here and first thanks everyone for sharing so i built last year a B 14 from uzumé in a brand new well insulated house that i had to built myself before , first here are some picts at that time, i was a bit worried the core could be over sized, also afraid that the B8 version was not powerfull enought,i decided i 'll be easier to get a large core smaller than the opposite here i am now, insulation do a very goog job and, if a full batch run awesomelly, i have to run small batches too many times and it didn't run that good the plan of the stove have been almost straight, only the bench is a bit smaller and the chimney is a bit different at first, and it was a mistake, i made the chimney full off fire briks, 7 meters from floor to rooftop, 180 mm square, as as i wanted to heat the bath room upstairs, it end up to eat only whith full batch this kind of chimney appends to be not that good for the draft, so 150 mm inner metal tube have been placed inside, and the gap have been filled whith vermiculite so yes, now, i run a 200 mm systeme in 150 mm flue, by the way the new b14 V5 do the same so the new chimney help, but too many small batches leads me to convert the stove in lower spec, i have already added a row off brick in the floor to reduce the height of the batchbox, but i ' d like to reduce the width, as well the riser, maybe the oven christophe
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Post by Orange on Dec 19, 2020 13:41:38 GMT -8
what was the problem with running full batch 1-2x a day?
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Post by landlubber on Dec 21, 2020 1:52:28 GMT -8
what was the problem with running full batch 1-2x a day? At the moment, here in France it's getting warmer, as usual around christmas, so one full batch now give me way too much heat. a full batch a day is adequate for the colder days, maybe two weeks a year .
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fuegos
Full Member
not out of the woods yet
Posts: 177
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Post by fuegos on Dec 21, 2020 3:05:56 GMT -8
Hello Landlubber if i'm understanding your post correctly the stove doesn't run well on small batches ? A brick chimney 7M high is a lot of mass to heat so maybe that explains why running small batches isn't good .I think the smaller flue pipe has compounded your problem so maybe a rebuild is needed using 200 mm insulated flue pipe ?
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Post by landlubber on Dec 21, 2020 3:21:47 GMT -8
hello fuegos
i think the main problem is a the 200 mm system is too big for the well insulated house, i need now a 150mm one or so
yes you are right, the brick chimney was a lot of mass to heat, but 150 mm tubing is the maximun it can afford, rebuiding the chimney is not on the list, and dooesn't match the need anyway
i plan a surgery on the core to downsize it, the internal ISA is not a issue as i can easely short cut the bench as needed.
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fuegos
Full Member
not out of the woods yet
Posts: 177
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Post by fuegos on Dec 21, 2020 13:28:26 GMT -8
"i plan a surgery on the core to downsize it" are you going to re build a 150mm core inside the existing build ? altering the existing core is really problematic. Any change to the core design can dramatically affect the performance.
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Post by landlubber on Dec 22, 2020 3:32:28 GMT -8
well, a 150 mm version of the stove is avaible from the same autor, fully tested, it's just a smaller stove, , that confirm the thing is scalable
i plan just few modifications, not building a core inside a core, my main concern is the expansion beetween differents parts of the stove as i will add layers of bricks, here and there
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fuegos
Full Member
not out of the woods yet
Posts: 177
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Post by fuegos on Dec 22, 2020 11:35:04 GMT -8
Well good luck , keep us posted.
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