Post by matthewwalker on Nov 19, 2012 10:42:59 GMT -8
Max, the half barrel systems I've built indoors have mass below the barrels mainly to act as a seal. I set them in 4" or so of good sticky cob to seal around the bottoms, but I doubt the mass down there gets much heat as griz mentions. I never worry about the seal as the cob does a good job of sealing 'em up, but you could always weld them together and weld thin plate along the open "bottom" as well to make a sealed chamber if you were going to install it indoors and didn't want to use cob.
A wooden bench? How do you plan to couple a wooden bench to your thermal mass? Will your stove HAVE thermal mass? Those half-barrels should get quite hot, I'd beware of contact between wood and the barrels or hot cob. And remember, when you char wood, you reduce it's flash (catch fire and burn) temperature DRASTICALLY.
Thought, none of the wood would be in contact with the barrels. i would put a layer of sand at the bottom, and cover them with mass. I wonder how hot does a bench gets? How low is the flash point of charred wood? 451F°?
I would have thought you'd have see this one before.
I should be OK then. I will leave a gap between barrel halves and wood of about 10cm each side and on the bottom. I don't think the mass can reach 100C° I need to find à way to airproof (gasproof) the halves on the bottom, without clay. And calculate what i need in terms of mass volume. What it will weight etc.
Mine is still in the workshop, i need to clean the bell. Well, i mean find time to do it. Then, i'll have to sort out the mass system. Half barrels. But it gonna take time, there's 40cm of fresh snow, i have two more veluxes to replace for à customer, and then i start working for the chairlift compagny i wok for in the winter. Kinda busy for the moment.
Petersburg: Where can I find a sketch of your latest and greatest design?
Sure, I've got a latest design, but it's more like a mock-up (or ugly prototype) than anything else. Don't get intimidated by this, and generate your own greatest design! I'm declaring the Worldwide BatchBox Rocket Stove Design Contest as opened! ;D Hurray!
My own contribution to this contest have to wait until sometime next year...
Post by matthewwalker on Dec 7, 2012 13:36:18 GMT -8
I've been running my shop system lately, which is a Peter style firebox into 6" riser, 55 gallon drum into 3 half barrel bench mass. Did a P channel retrofit a couple days ago and played with that a bit. It's removable so I've been getting the thing hot, shutting the door, and then trying P channel vs. no P channel. It's been pretty fun. Nothing conclusive to report at this point. Oh, also, played with adding in some chopped fiberglass to my cheapo "refractory" mix I've been playing with. That looks pretty promising, although none of my mixes so far would be suitable stand alone. Wrapped in cob I think it's a viable technique.
One thing about the batch firebox coupled to the mass, it can really put a lot of heat into the mass. I feel like it's burning quite a bit hotter than my indoor system. I just yesterday finally got a little handheld IR therm, so I'll get some comparison temp readings tonight.
They tend to not burn as cleanly as vertical feed rockets, but boy do they produce heat!
That's true Donkey, the standard unaltered J-tube will burn cleaner, but only compared to the unaltered batch box rocket. The same goes for both the optimized systems where the vertical fed rocket is the cleaner one of the two, though only marginally so.
However, the optimized batch box do produce a much cleaner burn as compared to the standard J-tube. The latter has got the tendency to produce brief (one or two minutes) hydrocarbon spikes whenever the fuel shift down. The optimized version sports a higher tolerance to combustibles overload, that's why the spikes are flattened out.
Last Edit: Dec 8, 2012 1:50:29 GMT -8 by peterberg
Peter, i have a question about tolerances. I could may be make a P chanel in mine. But i can't get to the very mouth of the heat riser. I have about 3cm of insulation in the way above. This wouldn't work for the P chanel?
Procrastinator in chief
5000ft high on the French/Italian border.
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deadstarsstillburn: The people over there recommended either a 6" batchbox or an 8" J-tube. I don't know what those are but am going to try to figure that out. What I need is a blueprint that I can scale to fit the need for my house. I have something likne 5000 square feet
Oct 21, 2020 6:53:00 GMT -8
deadstarsstillburn: but I do not need to heat all of it by any means. probably only need to heat half of that, maybe less.
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deadstarsstillburn: moreover, the house has 3 storeys (large attic) so I assume if I get very efficient heating on the ground floor, that will go a long way toward heating the upstairs as well, no?
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