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Post by jliebler on Dec 19, 2015 18:59:30 GMT -8
In my new house I want a multipurpose masonry heater. I hope to use a side fed 8" batch rocket "core" in a masonry wall that will divide my living and dining rooms. The basic idea is a thick masonry wall that is a bell heating both rooms with a white oven on the dining room side and the fire box door over a heated hearth (bench) on the living room side. The 8" size is primarily dictated by the commercially available doors. To get the oven floor down to a reasonable height means the top of the oven will essentially be at the top of the riser. The only solution I can envision is to put an insulated "cap" over the riser outlet and the oven. This will mean that the hot gasses from the riser flow downward around the oven in a small "bell" made mostly of insulating material. I've shown high density ceramic fiber boards, possibly coated with high temperature mortar to make up the interior of this "bell". In the attached sketch I'm showing 2 slide dampers, sliding in insulating refractory castings, that will allow by passing either or both bell(s). The details of combustion air in are not shown but will be from the basement below, up along the right side of the "core" plus air wash through the door. The core uses a variation of the "Walker Channel". The sketchup file shows a riser fabricated by cutting pieces of ceramic fiber board, I'm far from firm on this detail. My questions for the experts here is really basic, will it work to give usable oven temperatures? And do you see any issues?
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Post by philippeelskens on Feb 16, 2016 8:05:21 GMT -8
Is it possible that you forgot to attach the Sketchup file?
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Post by esbjornaneer on Feb 25, 2016 7:40:14 GMT -8
Hello, I can't see any file either. All I can say is that I am not getting cooking temps in my white oven (see here) as the gasses are not passing over all sides of the metal box for my white oven and they are following a hob in the gas stream. What materials are you building the walls of your white oven from? Metal is not good directly over the heat riser but in a bell/cavity before gasses are released into the bell-wall should be OK if not too hot. If the gasses are force/led in ducts/passages: down one side > under bottom > up back > over top > down last side > to bell-wall you should have better oven temps than me too. But be carefull with ISA of bell, there are threads about it here but I can't remember the names of them at the moment. I may have got my total ISA too big with the hob & oven and passages before my bell. What I should have done is build the stove outside before building inside. I recommend that for being able to test what oven temps you get and what adjustments you need to do to get it the way you want it. All the best and keep posting, Esbjorn |
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Post by Deleted on Feb 25, 2016 9:23:18 GMT -8
Thermal conductivity of cob or fire cement can be significantly improved
by mixing in as much as possible alumina or silicon carbide of high purity.
Silicon carbide has a much higher conductivity but a lower specific heat.
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Post by Daryl on Feb 25, 2016 12:20:58 GMT -8
You would have better temps and even baking if you heated from the bottom up. This sounds like you will be fighting Nature the entire time.
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