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Glenn Herbert wrote:The heat riser (what you have called the burn tube) generates a strong draft. If it were horizontal, that draft would have to come from a very good chimney and building layout, which cannot be guaranteed. Designers have come up with some horizontal cores (Matt Walker is a prime example) which work well as long as they are built exactly as designed, and connected to a good chimney.
Glenn Herbert wrote: part of the efficient combustion comes from restrictions or sharp bends in the flame path, which again must be built exactly as designed to work.
Coydon Wallham wrote:Just guessing from my understanding of J-tubes, a sideways riser would work and obtain an efficient burn, but would take much more priming to get it going. The vertical riser works as a minor pump for the draft at the start, the vertical exhaust as the major one.
You'd also need to have a priming spot near the exhaust. Normally if the system needs priming, tossing some burning newspaper to the end of the burn tunnel is good enough, but that wouldn't work if the riser were horizontal.
Brandon Hands wrote:
I guess I'm just not sure why combustion in the vertical part is necessary for draft. Wouldn't hot exhaust turning and going up a riser of equal length still cause the same draft regardless of whether it's already fully burned gasses?
Coydon Wallham wrote:Just guessing from my understanding of J-tubes, a sideways riser would work and obtain an efficient burn, but would take much more priming to get it going. The vertical riser works as a minor pump for the draft at the start, the vertical exhaust as the major one.
You'd also need to have a priming spot near the exhaust. Normally if the system needs priming, tossing some burning newspaper to the end of the burn tunnel is good enough, but that wouldn't work if the riser were horizontal.
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Become extra-civilized...
For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
Visit me at
dragontechrmh.com Once you go brick you will never go back!
Phil Stevens wrote:
Because its function is not solely for creating or enhancing draft, although it does both. It's the zone of turbulent mixing that facilitates complete efficient combustion that we are after. Without a riser, you've just got a partial solution.
For all your Montana Masonry Heater parts (also known as) Rocket Mass heater parts.
Visit me at
dragontechrmh.com Once you go brick you will never go back!
A good starting point to all RMH research: https://permies.com/w/rmh-resources and here https://www.permies.com/t/41635/Top-Questions-Rocket-Mass-Heaters
A good starting point for permies.com questions: https://permies.com/w/how-permies-works
Benjamin Dinkel wrote:Hi Brandon,
would you provide us with the reason behind the „horizontal riser“? There’s so much experience here, someone might come up with a solution to your design challenge that solves the need for the horizontal part with a different tweak.
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