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Post by Solomon on Jan 14, 2021 11:11:26 GMT -8
I'm finalizing my purchase of components for my upcoming basement RMH build. I've got about 600 clay bricks, a source for clay, and a source for sand. Can I use shredded corn stocks instead of straw?
At any rate, watching the videos, I saw a number of ceramic fiber cylinder heat risers and they seem to work quite well, so I wanted to use one. I'm building off of Walker's 8" Superhot J plans.
Here's the question. How much benefit is it?
My ideas: 1. A round tube works more efficiently to move a fluid. For the same cross sectional area, a square pipe is going to have more dead space in the corners, reducing the effective cross sectional area. 2. More insulation is better, to keep the rising column rising as fast and as forceful as possible. 3. The transition between a rectangular burn tunnel and a round riser should introduce some extra turbulence, like a trip wire or that lip in the dragon heater, for more mixing and cleaner burn.
My main concern is draft. I want this thing to suck like a black hole. I want something approaching that problem like Wheaton talks about where the stove sucks so hard it pulls the fire off the wood. I want utilitarian and bullet proof so my family can work it without having read the books like I have.
Anyway, the only source I can find for riser tubes (Zartech) is pretty expensive so I just want to assuage my doubts. I'm probably doing it no matter what you say, fair warning.
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Post by pigbuttons on Jan 14, 2021 19:40:49 GMT -8
Everything you say about round vs square risers is true. If you can afford the ceramic fiber, by all means I recommend it. I know nothing about shredded corn stalks, sorry.
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