In the RMH 55 gallon barrel design, the smoke from the heat riser goes up 1.5 - 2 inches, hits the top of the barrel, then flows all the way to the bottom of the barrel before exiting into the mass storage or bell. In your design, as near as I can understand by studying the pictures, there is an opening into the first bell that is at the same height as the top of the heat riser, and there is no flow to the base of the heat riser because it is completely insulated around the heat riser inside of the ceramic flue. Have I understood this correctly?
1. Is there any difference in the draw between the design that calls for the smoke to be pulled down to the base of the 55 gallon drum before exiting into a mass storage or bell, and the design that has the heat riser completely insulated with no space on the sides, and the smoke being drawn directly into the bell from that height? What does this do to the draw inside that first bell to have the entrance into the bell more than a third higher than the base?
Why is the top of the ceramic flue in the heat riser column so much higher than the top of the heat riser? With the opening into the first bell right at the same height, would the draw pull the smoke into the bell, or would the smoke first rise to the top of that column, and then gradually be forced out because it is effectively a bell above the heat riser, and once filled with hot gasses, would then flow into the first bell?
3. Would it be possible to have the opening into the first bell smaller (like about 2 inches), and the top of that column end right there at the opening, so that the heat would hit the top of that column and provide a cooking surface as it is exiting into the first bell? Would it exit into the bell with only a 2 inch high hole, or would it not draw properly and back up into the room?
5. I don't have any desire to be able to put tiles on the outside of the columns. Do I really need the fire bricks inside the column, or could I simply fill the space with insulation (what I have is perlite), and then cover with fire clay? That would be far less expensive and the lack of money is a serious consideration (I am 65 and live very simply in wilderness on a low retirement income).
7. Why is the ash pit hole above the ground surface? Would it be possible to make that ash pit hole level with the base of the towers so that it would be easier to scrape out the ashes? I really like the design of cleaning out ashes with your system - it appears to be possible to clean out the entire base of all of it. With the barrel design, there are areas that simply cannot be reached for ash cleanout.
6. Why is the first bell a foot taller than the second bell? Does this help the draw?
Most of the heat is taken out in the 1st bell, therefor it needs to be bigger.
Lua Sage wrote:Am I looking at the wrong materials?Lua
Alan Mikoleit wrote:Cindy, I know to use fire brick for the burn tunnel and riser. You would not use 18 inch diameter pipe for those any way. I am asking about replacing the 17 inch square flues with 18 inch diameter steel pipe. thanks Alan
Lua Sage wrote:Beautiful. Simply beautiful. You are clearly artists.
I have decided to build and install the jet stove itself and forego a storage medium at this point. ...