• Post Reply Bookmark Topic Watch Topic
  • New Topic
permaculture forums growies critters building homesteading energy monies living kitchen purity ungarbage community wilderness fiber arts art permaculture artisans regional education experiences global resources the cider press projects digital market permies.com all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • Nicole Alderman
  • raven ranson
  • paul wheaton
  • Jocelyn Campbell
  • Julia Winter
stewards:
  • Burra Maluca
  • Devaka Cooray
  • Bill Erickson
garden masters:
  • Joylynn Hardesty
  • Bryant RedHawk
  • Mike Jay
gardeners:
  • Joseph Lofthouse
  • Dan Boone
  • Daron Williams

Size question  RSS feed

 
Posts: 2
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I would like to use RMHs in small insulated buildings, roughly 8'x16' and 16'x24'. The dvds and E&E's book don't say much (at least that I've found) on smaller spaces. Would it be better to drop down to a 5" dia duct or just shorten 6" ducting or am I overlooking something? My goal is to get the mass to where it will keep the place warm for at least 18 hours, before melting the occupant with the heat off the barrel. Any thoughts or suggestions will be appreciated! Thanks!
 
pollinator
Posts: 1947
Location: Cincinnati, Ohio,Price Hill 45205
52
forest garden trees urban
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
It sounds like you are planning a J style rocket.
If so,6" is the smallest size recommended.
Smaller J style  rockets tend to be finicky.
Don't worry about it being too big, the thermal mass dampens the extremes of the heat.
In some ways, the rocket is like a bucket used to fill a bathtub(the thermal mass).
The bigger the bucket, the faster you can fill it...
I would consider putting cob all the way up the sides of your barrel,leaving only the top bare.
 
Henry Sikorski
Posts: 2
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Thank you for your suggestions William. Covering most of the side of the barrel sounds like a good deal!
 
gardener
Posts: 1290
Location: latitude 47 N.W. montana zone 6A
116
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Cover your barrel no more than 2/3 or so. Cob, nice and thick at the bottom and getting thinner as you near the top ring. The barrel will expand and contract and your cob covering will have a small gap visible at the thin area.  Use plenty of sand in your cob mix or you will get excessive cracking.
DSCN4069.JPG
[Thumbnail for DSCN4069.JPG]
 
Posts: 38
Location: Penticton, Canada
1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Thomas,    I've always liked the idea of cobbing up around the barrel to decrease immediate heat release and increase mass in my small shop and also to reduce the fire hazard of my wood work bench so close to the barrel  but have held back on that one until I come across a barrel that has a detachable lid with a band to hold it in place. Yours appears to have one. Cleaning the top of the riser and around the barrel can be a lot more difficult otherwise.
 
thomas rubino
gardener
Posts: 1290
Location: latitude 47 N.W. montana zone 6A
116
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi Gerry;  I purchased my barrel at  the north 40 farm and ranch store. I think I paid $30.00 for it.  Having a barrel with an opening lid is essential to perform maintenance and inspection.
My RMH is in a greenhouse/studio, my core is all heavy firebrick and the barrel has as much cob as I could get away with. I wanted the most mass as I could to keep the heat in the room. After 5 years I can tell you IT WORKS ! We went from 12 + cords of wood to less than 5 !  Before we had to keep a fire going all night ... now we have NO fire all night,in a plastic greenhouse !
 
That's my roommate. He's kinda weird, but he always pays his half of the rent. And he gave me this tiny ad:
Food Forest Card Game - Game Forum
https://permies.com/t/61704/Food-Forest-Card-Game-Game
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!