• 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
stewards:
  • Mike Jay
  • Jocelyn Campbell
  • Devaka Cooray
garden masters:
  • Steve Thorn
  • Dave Burton
  • Dan Boone
gardeners:
  • Joylynn Hardesty
  • Mandy Launchbury-Rainey
  • Mike Barkley

Heat Risers...

 
Posts: 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi All,

Just finished reading Ianto Evans' & Leslie Jackson's book on rocket mass heaters and one question came up about the heat risers.
There's instructions on how to build a brick RMH including a brick riser and says that it must be insulated but doesn't say why...
So, why does a brick riser need to be insulated (I would have thought that the bricks themselves would be sufficient)?
 
Posts: 3366
Location: Kansas Zone 6a
37
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
The bricks are not insulative enough. You need HIGH temps in the riser to get the clean burn/re-burn. You also need a large temperature difference between the riser and barrel to "pump" the exhaust through the heat exchanger/bench.
 
Die Fledermaus does not fear such a tiny ad:
permaculture bootcamp - learn permaculture through a little hard work
https://permies.com/wiki/bootcamp
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!