Rein Baarsma wrote:
My next idea what's wrong is the heat riser. It's inner pipe is only 10cm, while on the design it is 6 inch (15 cm). That's 1 1/2 times my core. Can this be the problem? It's seems a pain to start again with a new heat riser, but if you guys think this helps I will.
Peter Berg wrote:Not a single part should be smaller than the burn tunnel
Peter Berg wrote:Stick to the rules and provide something of a vertical chimney stack
Peter Berg wrote:the burn tunnel and riser should be insulated
Peter Berg wrote:when the stove is finally working like it should the metal pipes will burn out in no time.
Rein Baarsma wrote:The burn tunnel is about 13x12 square. That means a heat riser with 6 inches diameter would be bigger and therefore be better.
Rein Baarsma wrote:Not sure what a vertical chimney stack is exactly. But my exhaust pipe is going out at ground level, but afterwards going up pretty vertically about 2meters. Isn't that a vertical chimney?
Rein Baarsma wrote:For me the concept of insulating the whole burn tunnel is new. We did put extra stones around it, but I guess that's not insulation. It also begs the question if the vermiculite board that we used as a roof on the burn tunnel is allright? Or is it better to put fire bricks as a roof and insulate the whole thing with vermiculite?
Rein Baarsma wrote:I have the feeling fire bricks won't fit in the 55gallon barrel. What should I use as the inner core for the heat riser?
Rein Baarsma wrote: There's a lot of residue ash, both in the fire chamber and inside the barrel. When I've burned it a few hours the ash and hot coals start taking up a lot of space and eventually I start getting a lot of smokeback. I think it's not rockety enough.
How can I change my rocket mass heater so it will function better?
I thought the wood feed might be wrong and had several attempts with adding 1-4 bricks to make the wood feed a bit deeper and less long. Doesn't seem to help a lot.
At this point I have the most success with no smokeback when I make the fire deep inside the fire chamber (inside the barrel).
Is the heat riser too small?