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Post by spacevan on Mar 11, 2010 23:41:10 GMT -8
has any one thought of building the burn box and tunnel in the basement and have an insulated heat riser extend up to the next floor and place the 55 gal drum on top of it and have a heated bench and or wall after the drum like a normal rocket mass heater? would complete combustion of the gasses take place still having the heat riser so tall?
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Post by Donkey on Mar 12, 2010 9:31:37 GMT -8
Complete combustion WOULD take place.. All the fuel should be combusted by the time it leaves a 2 foot riser, after all..
Interesting idea. I imagine that a lot of (at least) the initial heat would be captured in the extra long riser or lost to insulation inefficiencies. On the other hand, it seems like it would be possible to have an extra long bench upstairs, if you wanted.
I imagine it would work, it should produce one hell of a draft, how well it would heat is anybodies guess.
Huh... Well, try it and see.
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Post by spacevan on Mar 12, 2010 9:50:00 GMT -8
Thanks for your responce i will most likely build it this summer and see how well it works in the winter. i'll post pics of the build.
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Post by grizbach on Mar 12, 2010 17:36:01 GMT -8
You can't just light a rocket and leave it. The wood needs to be fiddled with once in a while.
If you plan on being on the 2nd story with the fire going, You're going to have to make a lot of trips downstairs.
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Post by spacevan on Mar 12, 2010 20:14:41 GMT -8
I was hopeing that with the higher heat riser i could have a a taller maby 24" and hopefully larger burn box maby 10"x10" or 12"x12" with an ash chamber at the base, an outside air duct inlet, and also a clean out for the burn tunnel. If that works i could have a fairly good stack of wood in the burn box. i'll find out when i build it, my only concern would be that the fire could possibly burn up the wood an reverse the draft but i dont think that would happen with the insulated heat riser being aprox 10'.
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Post by canyon on Mar 12, 2010 22:30:32 GMT -8
You don't have to do down feed. Check out peterberg's rocket bell for batch style burning. You could also do a barrel stove lined with refractory and build a fire to burn top down. You might need to have your heat riser seperate (as opposed to on top of) from the barrel (back exit) due to weight load. Just a few ideas.  |
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Post by grizbach on Mar 12, 2010 23:23:15 GMT -8
Excellent advice canyon. Batch load I believe, would be the way to go.
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Post by spacevan on Mar 13, 2010 7:58:00 GMT -8
Thanks for the advice, i'll take a look at the bell rocket stove. would the same clean compleate burn still be achived with burning a batch load as opposed to the j type rocket heater
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Post by grizbach on Mar 13, 2010 23:29:40 GMT -8
You should be able to get a clean burn with a batch load. Take a look at donkey's oven. He has a chamber in there that he places lighted kindling in, and then follows it up with cordwood. So in essence it's a top lit batch run turned on it's side. He can correct me if I am wrong.
What I've got imagined is donkey's burn chamber in the basement feeding into an insulated heat riser which leads up to a hollow wall on the main floor that serves as the bell.
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Post by spacevan on Mar 14, 2010 12:10:00 GMT -8
That is essentially what i want to do grizbach, have the fire downstairs and the mass up stairs. the burn area and riser will be well insulated because i dont need any additional heat downstairs but dont have the room up stairs For the burn area. I am a welder by trade and try to figure out and do/build what ever i can. I am confident that i can build a hollow wall and bench to rought the flu gasses through but im not shure that i could build i massonary burn box without to many mistakes that is why i thought that making a j tube rocket stove from fire brick would be simpler as there is no large overhead areas that need to be supported with refractory slabs, as there would be in a traditional masonary heater.
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Post by grizbach on Mar 14, 2010 15:21:15 GMT -8
I see that we are thinking along the same lines. I plan on building such a heating unit in the future. May I suggest that you place a heat shield on top of the heat riser to block the extreme heat from the brick. Maybe a stainless prefforated channel? I look forward to your progress.
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Post by spacevan on Mar 14, 2010 20:41:30 GMT -8
The heat shield would be a good idea, I drew up a sketch with paint it is not to scale and not exactly how im thinking of building it but it shows the general idea.
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Post by spacevan on Mar 14, 2010 20:50:19 GMT -8
The heat shield would be a good idea, I drew up a sketch with paint it is not to scale and not exactly how im thinking of building it but it shows the general idea. |
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Post by spacevan on Mar 14, 2010 20:51:00 GMT -8
The heat shield would be a good idea, I drew up a sketch with paint it is not to scale and not exactly how im thinking of building it but it shows the general idea. |
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Post by spacevan on Mar 14, 2010 20:57:24 GMT -8
Does any one know that if i used a good quality clay slip and mixed it with vermiculite to insulate the heat riser with, would the clay and vermiculite hold its form if the steel heat riser burnt away at the bottom. I might just use 8" x 1/4" steel pipe but then it would take longer to get the burn temp up for second combustion of the carbon gasses. The vermiculite and clay would be probably 6" thick around the heat riser.
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