Franklin Yu

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since Dec 11, 2013
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Recent posts by Franklin Yu

So the idea I'm toying with right now is to build the whole thing in an old burn barrel. Layer of high thermal mass filler, then set the j-tube down on top of that and out the side, then more filler to cover the magazine, then fit a larger tube around the stack and fill the void between with insulation, with an exit hole to the chimney just above the top of the filler. Then I can put the lid on and cover it with bricks or something to retain as much heat as possible, or maybe even put a couple layers of stacked bricks under it first as well. Have I got anything wrong? Crude and not-to-scale diagram is attached.

Additionally RE filler: what should I use? Ideally something I can pour in dry so the thing can be disassembled later. Is the insulation around the stack the same stuff, or different? I was half thinking to just use local dirt but if a bag of vermiculite or whatever is ten bucks and works better I can go that way as well.

4 years ago
Ooh. Dissecting that has been most informative.

What is the purpose of the little air (?) tube above the feeding magazine? Is that more effective than having the air flowing in under the wood?
4 years ago
Says I need an account to view that. Ah well.

However, this thread http://www.permies.com/t/22485/wood-burning-stoves/mini-rocket-mass-heater has a design that looks plausible for this location. At least it's built in roughly the same amount of space.
4 years ago
I'm quite comfortable DIYing things - half the point of this is wanting to build something and finding a reason :p. Haven't the first clue as to the square footage, I'm afraid.

Satamax, I don't read whatever language those last two links are in, sorry.

Anything commercial is out, I just can't afford it. If I had the kind of money to be throwing around like that I'd be building my own place :b

These links are certainly giving me an idea of what I'm looking for!
4 years ago
Going down that first page, those threads seem concerned with in-wall hearth type arrangements. Maybe fireplace was the wrong word - this is a freestanding wood stove with a straight pipe up through the ceiling and roof.
4 years ago
Is there? I didn't see it on my first graze through.
4 years ago
I'm in southern Oregon at roughly 1600 feet. I've attached a crude paint sketch of the ground floor of the house. There's also a single-room second floor directly above, and the same size as, the left-side bedroom. The fireplace and chimney are marked. No photos - I am presently snowed in elsewhere which is why I had oodles of spare time to consider this project. :b
4 years ago
Hello thar. I've been looking into stove designs to replace my existing (broken) wood stove. While I've been all over youtube looking for different designs I certainly don't yet know enough to tackle this, and I was directed here for potential feedback. Here is my situation:

We have an existing wood stove and fire-bricked corner of the living room, with a metal chimney straight up and out the roof. The wood stove is basically toast - I'm unclear on what kind of door it had, but it's gone, and given the old wood shake roof I'm somewhat amazed the house is still standing after decades of using the thing for heat.

What I'm looking for is something I can put together on the relatively cheap side (ideally for about what the old stove can sell for at most), and which will not throw sparks far enough to escape the other end.

From what I gather, an ideal rocket mass heater will not leave hot enough exhaust for a traditional straight-up chimney to work, so I'm hoping it's possible to find a balance where a decent amount of heat is retained in the house and no live sparks are escaping, while still keeping the exhaust warm enough to rise out and not smoke the house out. Punching a hole in the wall isn't on the table, unfortunately. On the plus side, we have sufficient wood left over from before the death of the old stove to handle this winter easily, even with a less than perfectly efficient stove.

I'm imagining something not unlike this illustration: (lifted from http://www.richsoil.com/rocket-stove-mass-heater.jsp)



With the rightmost end terminating in a 90 degree bend feeding up into the chimney. I could conceivably build the whole thing in a box of some kind, with the metal stove structure bedded in dirt for later teardown and removal. This is all spitballing, of course, so any input would be appreciated.
4 years ago