• Post Reply Bookmark Topic Watch Topic
  • New Topic
permaculture forums growies critters building homesteading energy monies kitchen purity ungarbage community wilderness fiber arts art permaculture artisans regional education experiences global resources the cider press projects digital market permies.com private forums all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • Nicole Alderman
  • r ranson
  • Anne Miller
  • paul wheaton
  • Joseph Lofthouse
  • Jocelyn Campbell
  • Mike Jay
garden masters:
  • Steve Thorn
  • Dave Burton
  • Joylynn Hardesty
  • Carla Burke
  • Pearl Sutton
  • Greg Martin

Zoned Rocket Mass Heater?

Posts: 55
Location: Mad River Valley, VT
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Has anyone done or seen a "zoned" rocket mass heater: e.g. one that can exhaust via one of multiple pathways?
We're thinking it would be doable (maybe) to have two zones in a greenhouse system: one to heat 100+ gallons of water for watering plants and maybe to hot tub in, and one to heat a 3-4 ton bench of cob.
I would think we could use a "gate" like in a dust collection system where we could heat the cob bench OR the hot tub, but not have to do both. Probably we'd need 2 gates to open one zone (flue) and close the other.
The main issue I can think of would be potential for gasses escaping at the gate into the space. Is a flue in positive pressure - pushing - or negative, pulling from vertical flue (ours will be 20" feet (and insulated for the last 8' which should provide good "pull").
Gates could be sliding sheet metal or the like. Or even typical stove pipe dampers. Thoughts?
Posts: 3370
Location: Kansas Zone 6a
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

If you can bring them back to a common chimney/exhaust it should work. If you have two separate exhausts, you could have one try to draft all the time and overpower the other.

If cores were easier to build, I would say just to build two stoves. Two 6" stoves aren't that much more material cost than one 8".
They weren't very bright, but they were very, very big. Ad contrast:
permaculture bootcamp - learn permaculture through a little hard work
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!