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Post by mannytheseacow on Feb 2, 2022 15:48:10 GMT -8
Sharing this oven heater I just finished. Matt's riserless core, built from insulative firebrick. Door and RA330 stub from Tom at Dragon Tech. Oven door is dimensional lumber, capped with ceramic blanket and wrapped in HVAC aluminum sheeting. Surface area is close to Peter's recommended dimensions for a 6" batch. 11 ga steel plates on top of bell. Works great. The oven is extremely controllable based on wood loading. You can see the box stove in the background that this replaced.
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Post by josephcrawley on Feb 3, 2022 6:55:40 GMT -8
The arch is a very nice touch
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Post by mannytheseacow on Feb 3, 2022 13:59:38 GMT -8
Edited: Images out of order
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Post by mannytheseacow on Feb 3, 2022 14:08:56 GMT -8
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Post by martyn on Feb 4, 2022 0:38:19 GMT -8
Nice job, what sort of temprature do you get on top of the bells steel top?
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Post by mannytheseacow on Feb 4, 2022 9:06:24 GMT -8
Thanks, martyn. I don't have a way to measure the temp there but as you would expect it gets warm to the touch almost immediately and then holds steady as the bricks absorb heat. A single load of wood would not boil water but on days that I keep the fire going all day it can easily simmer and boil all day long. Made some birria in a 12qt dutch oven on it for hours and hours yesterday... However, it was never intended to cook on, though that is a nice benefit. Its primary purpose is throwing heat out into the room and heating the floor above, which it also does nicely. Initially I just had the oven and not the bell to the side and although it worked great as an oven it did little for space heating.
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Post by martyn on Feb 4, 2022 13:51:25 GMT -8
Still a nice area to have, to keep food warm and water ticking over. So it looks like the the hot air is entering the oven at the bottom and exiting down into the bell on the opposite side, what happens if you open the oven door when the fire is burning?
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Post by mannytheseacow on Feb 4, 2022 15:43:52 GMT -8
You are correct on the flue path. So far opening the door hasn’t been a problem. I purposely made the oven tall thinking that smoke could collect there when the door was open, but this is only guesswork. I was also thinking with the bypass high and towards the back I could open that before opening the door but honestly I’ve never even tried it. I usually go in and out of the oven very quickly and on the backside of a burn, and maybe a little smoke gets out here and there, but it isn’t nearly as bad as a standard fireplace or box stove that offers no cooking or baking usefulness.
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fuegos
Full Member
not out of the woods yet
Posts: 177
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Post by fuegos on Feb 6, 2022 5:13:49 GMT -8
Wow that's a great looking build ,love the arch & the door.Did you use any mortar building the core ? my concern on my own build was that a dry stack could be knocked out of place by careless loading of wood.My bricks were recovered old handmade ones , not very regular.Also the top layer of firebrick has very little to sit on. But i see from pictures 5 & 6 that you seem to have the core butted up to the red brick & the oven floor sitting on top of the core ? I suppose you covered the secondary air channel with firebrick ? I used what i had in my build - dense firebrick - but built the outside as a second skin.It takes about 2 hours to reach 500/550 F & when it's coaling we block the chimney -it's an outdoor build.Really inspiring , some great ideas !
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Post by mannytheseacow on Feb 6, 2022 10:27:36 GMT -8
Thanks, Fuego. I followed Matt’s guidance and did not use mortar in the bottom layer of brick or in the core. Yes, having new square brick definitely helps. This was a new experience for me buying everything new instead of salvaging my build. I’m very anal about wood loading and share your concerns about the firebrick moving. The red brick and mortar form a loose shell around the core. I ran a timer this morning and on a cold oven with a full load of fir/larch it took 9 minutes to reach 400 degrees, and peaked at 600 in 14 minutes. Of course this is just convective heat and the brick is absorbing some of that energy to radiate later. By modifying wood loading I find it very easy to keep control of the oven temps by 25 - 50 degrees, between 300 and 500 degrees (f). BTW, excuse my error in not initially thanking Peter, Matt, and all the other folks that have made this idea come to a well documented and proven science. It is truly awesome to see the open source information that is freely shared, and has been for over a decade now.
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Post by mannytheseacow on Feb 6, 2022 10:34:48 GMT -8
Also, the secondary air I did not photograph very well, but what I did was lay ceramic blanket in the gap where the secondary air goes between the firebrick, lay the metal air channel in it so the blanket kind of wrapped around it, then laid a layer of thin firebrick on top of that. I figured the bottom of the firebox will likely receive the most abuse when removing ash, so this thin firebrick layer is largely sacrificial.
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fuegos
Full Member
not out of the woods yet
Posts: 177
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Post by fuegos on Feb 8, 2022 4:09:47 GMT -8
"Of course this is just convective heat and the brick is absorbing some of that energy to radiate later" Ive seen some insane temps ,with the thermometer off the scale well past 600F but then closing down the air & blocking the chimney & things quickly settle down to a more realistic 450 F - 500F .the most stable range seems to be between 400F & 450F.My build doesn't have secondary air as we were in lockdown during the build i'm thinking about retrofitting it later. I'm also firing mainly with softwood ,usually 3 half/small loads with a bit of oak in the last one.Also the positive open sharing aspect of this community is one of the best things for me ,apart from getting to play with fire.
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Post by Orange on Feb 14, 2022 12:54:43 GMT -8
build photos are satisfying to watch
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Forsythe
Full Member
Instauratur Ruinae
Posts: 208
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Post by Forsythe on Feb 28, 2022 16:29:42 GMT -8
That is a really beautiful build, mannytheseacow ! I gotta ask: how's that aluminum HVAC sheeting holding up on the inside of the oven door?
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Post by mannytheseacow on Mar 1, 2022 18:33:51 GMT -8
Thanks. The aluminum hvac material wrapping the oven door seems to be holding up just fine.
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