Win a copy of The Tourist Trail this week in the Writing forum!
  • 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 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

Chimney design for greenhouse heater

Posts: 39
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi fellow permies

Am needing a heating system for my greenhouse during the cold months of the winter.

I have access to a load of house bricks for free and i will be building myself a rocket stove.  The idea is for the rocket stove to sit just outside the greenhouse with the exhaust pasing through some brick channels in the floor of the greenhouse (essentially the footpath) and then exiting outside into a chimney.

The rocket stove could also be used as a stove at other times so it would have to have some sort of bypass.  

Just wanted some opinions on the best layout for the brick floor chamber and whether or not this would even work.  Kinda resembles a rocket mass heating bench in my mind.

So do i go for a single chamber, with the chimney at the other end of the greenhouse, or a double chamber so that it returns back to the entrance point, thus giving up more heat out of the exhaust gases, or would this cause  a backdraft because the run is too long. Would i need to seal the bricks on themselves (with clay) to save gassing myself in the greenhouse!?

Or are there other problems with the concept?

Thanks in advance
[Thumbnail for 20180423_081543.jpg]
[Thumbnail for Allotment-Upper-Plot-1.jpg]
[Thumbnail for 20180423_081600.jpg]
Posts: 607
Location: SoCal USA
cat dog trees wofati composting toilet bike solar
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
You would definitely want the entire exhaust run sealed inside the greenhouse, so there's no risk of combustion gasses inside the building. The length of the run is based on the size of the system, meaning the diameter of the combustion path and ducting. Each turn adds resistance and shortens the effective length, but if you use a stratification chamber instead of ducting encased in cob then the rules change some there too.
That feels good. Thanks. Here's a tiny ad:
Dave Burton's Boot Adventures at Wheaton Labs and Basecamp
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!