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Post by yigenuren on Nov 9, 2010 17:21:03 GMT -8
I've got my rocket stove built. It's an 8" flue system with about 28' of ducting. I had some problems getting the draw right but solved it by lifting the barrel and making the wood feed smaller. However I've noticed that the barrel gets extremely hot while the ducting is just getting warm. I'm still working on mudding everything in but I'm seriously thinking of putting urbanite and mud on the barrel to store the heat coming off of it.
What might be the problem or is there one? Anyone else have this happen?
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Post by grizbach on Nov 10, 2010 2:10:40 GMT -8
The top of the barrel is getting the full brunt of the fire, most definitely it will get hot. My system is just under 6" with a 1/8" plate for the top of the barrel. I can get a slight glow out of it if I stoke it to the max. The design of RMH's is to give off a lot of heat off the barrel and scavange the rest with the mass. 8" is some serious heat. If you think you need to cover the barrel, leave the top 1/3 to 1/2 bare. There is too much expansion there from the heat, and anything covering it will crack.
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Post by yigenuren on Nov 10, 2010 4:44:21 GMT -8
Well it's not just the top of the barrel that's getting hot, but the entire barrel. Could it be that the gap between the riser insulation and the barrel is to big? I used metal cloth to contain the insulation (never again) so it's not exactly perfectly straight and smooth, leaving different sized gaps between it and the barrel wall.
Another quick question. Winter is coming up real fast here so I'm wondering if there is anything besides mud and cob that can be used to suck up the excess heat and release it slowly back into the room? I'm working on an open jobsite with no other out buildings or shelter to speak of, so once everything starts freezing, mixing sand clay mixture it out of the question.
Any suggestions?
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Post by canyon on Nov 10, 2010 9:10:47 GMT -8
You can do like we've been doing for a month up here in Alaska and use buckets of clay, sand etc. that you bring in ahead of freezing and keep on or near your bench. Or at least pre bucket or tote up materials so you can bring them in to thaw a few days before you need it. I've got stuff prepared in containers under three feet of snow already that I only need to pull in to thaw three days prior to use.  |
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Post by grizbach on Nov 10, 2010 10:39:11 GMT -8
Canyon has it right, better start digging! A water tank is another option, but you just multiplied the complexity level greatly. With COB, slap it on and forget about it!
A larger gap is always better than too small. Try to make it as consistent as possible.
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