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Post by martinm on Jul 16, 2019 5:02:16 GMT -8
Hello Planning on single bell Batch box rocket stove. On site we have 50 cm drop between concrete base, on which the stove would be build and finished floor. Considering this and the option to build more ISA by building on top of the concrete base (underneath there is basement which could also be heated a littlevia the concrete base ) I am exploring the option of having lower exhaust exit flue , while having the heated bench on top of the finished floor . I have seen Peter experimenting with three barell rocket stove which apparently worked OK having such drop between the fire box and the lower exit. On MHA meeting I have also seen the two bench model of a stove where there was a baffle inserted on the way of gasses to better the flow. my question is : what should I consider or design to be sure that the heated bench will extract heat in this layout . drawing is schematic ! Any thought and shared experience would be highly appreciated . alchemyarch.files.wordpress.com/2019/07/2019-07-16-11.09.36.png
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Post by alarin on Jul 17, 2019 19:36:07 GMT -8
Hello. First you need to evaluate the draft of your chimney.
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Post by boscovius on Jul 18, 2019 5:05:27 GMT -8
I am facing a similar situation where I will be building my bench against a pre-existing manufactured fireplace (Heatilator) built into my basement wall. My firebox and bell will be off to one side. Since most of my chimney is enclosed, I experience good draft during the winter season and I don't suspect I'll have much of a problem. I imagine the draft I have will ramp up as the warm flue gasses move into the bell cavity under the bench and increase in velocity in tandem with the growth of the fire in the firebox.
I will not be attempting this with a run of flue pipe and mass as I feel this will create too much restriction and cause smoke to back up into the room.
But like was said, you must have a good idea of how much draft you are working with and it's consistency.
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