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So, asking for a friend...the rocket mass heater has only a twelve foot cob bench,, because of code reasons, and a 6" duct through that.
It has an 8" j tube with an extra high barrel and extra large--65 gall, plus 8" off a second barrel, and that's in addition to the manifold.
But wait, there's more! Act now and get half off your next bell.
There's a second bell for a stratification chamber (to compensate for the short bench) and this has been mostly covered with cob on the sides, about 2" . (My friend is running out of clay but can get more in a few weeks). The top has a tub of water in a big aluminum cauldron with a lid, maybe 20 gallons, it's squat and almost fills the whole barrel top with its girth. It reaches temperatures of maybe 130 F after a burn.
There's no cob hat on the first barrel but there could be...but it does have a metal "bonnet" of sheet metal curved over to reflect some heat back toward where it's needed instead of just heating the ceiling there. (The ceiling has not been complaining about the cold).
The bench gets only slightly warm. The draft may still be too strong.
The room goes back down to about 55 degrees rather quickly (ie overnight).
The insulation situation between the first floor there and the. basement is still kind of sketchy--my friend has insulation but fitting it in around ducts and figuring out of how to remove ceiling panels has not yet occurred.
There is a crude baffle in the bottom of the exit chimney. It could be more baffled. (I, on the other hand, am almost fully baffled already.)
8" J tube with 6" duct shouldn't be a problem because of Charles's Law, the temperature has gone down from over 1000F to 300 by that point, and also because Uncle Mud said so.
I like to be able to cook on the top of the main barrel, including a tall pot of stew, but I'm wiling to let that go if I must, I could put a cob hat where there never was a hat. (If you get that reference that makes me happy.)
What would you prioritize?
Do you agree that a baffle is helpful?
What else am I missing?
Thanks, team.
It has an 8" j tube with an extra high barrel and extra large--65 gall, plus 8" off a second barrel, and that's in addition to the manifold.
But wait, there's more! Act now and get half off your next bell.
There's a second bell for a stratification chamber (to compensate for the short bench) and this has been mostly covered with cob on the sides, about 2" . (My friend is running out of clay but can get more in a few weeks). The top has a tub of water in a big aluminum cauldron with a lid, maybe 20 gallons, it's squat and almost fills the whole barrel top with its girth. It reaches temperatures of maybe 130 F after a burn.
There's no cob hat on the first barrel but there could be...but it does have a metal "bonnet" of sheet metal curved over to reflect some heat back toward where it's needed instead of just heating the ceiling there. (The ceiling has not been complaining about the cold).
The bench gets only slightly warm. The draft may still be too strong.
The room goes back down to about 55 degrees rather quickly (ie overnight).
The insulation situation between the first floor there and the. basement is still kind of sketchy--my friend has insulation but fitting it in around ducts and figuring out of how to remove ceiling panels has not yet occurred.
There is a crude baffle in the bottom of the exit chimney. It could be more baffled. (I, on the other hand, am almost fully baffled already.)
8" J tube with 6" duct shouldn't be a problem because of Charles's Law, the temperature has gone down from over 1000F to 300 by that point, and also because Uncle Mud said so.
I like to be able to cook on the top of the main barrel, including a tall pot of stew, but I'm wiling to let that go if I must, I could put a cob hat where there never was a hat. (If you get that reference that makes me happy.)
What would you prioritize?
Do you agree that a baffle is helpful?
What else am I missing?
Thanks, team.
