Win a bunch of tools from Truly Garden and Loma Creek! this week in the Gear 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 skip 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
  • Pearl Sutton
  • James Freyr
  • Mike Haasl
  • paul wheaton
  • Dave Burton
stewards:
  • Joylynn Hardesty
  • Jocelyn Campbell
  • Joseph Lofthouse
garden masters:
gardeners:
  • Carla Burke
  • Steve Thorn
  • Eric Hanson

Coating for underground pipes in our RMH

 
Posts: 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
We are building a 6" diameter RMH in our greenhouse at a cooperative home in Marquette Michigan. Our plan is to essentially build an RMH but instead of building a cob bench as the mass we are using a garden bed in the greenhouse as the mass. We are nearly finished but the city inspector is concerned about how we are going to make sure that the pipes underground don't degrade from exposure to water and soil. We have been doing some research and have come up with two possibilities: cover the entirety of the underground pipes with concrete, or, cover the underground pipes with some sort of heat and corrosion resistant resin. We are leaning towards the resin approach due to the ease of access for future members of the co-op if maintenance is necessary. However, the resins we have found will melt at 300 degrees F.

ebay

Our biggest question is: what temperatures do the heat exchange pipes in the mass section of the RMH typically reach?

We would also like to know if anyone else who has built an underground heat exchanger has any experience or pro-tips for us.

Thank you
 
gardener
Posts: 2519
Location: Cincinnati, Ohio,Price Hill 45205
186
forest garden trees urban
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I'd go with the concrete. So cheap, pretty easy.
I'd use the high strength stuff that includes fibers.
Even after the metal fails,the channel s will persist.
 
gardener
Posts: 3007
Location: Upstate NY, zone 5
136
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Concrete would be easy and effective. If you don't want to use that, you could skip the ducts and just build the channels from masonry - block or brick would do the job and last. If you can get recycled material, it will be cheap and the looks will be irrelevant.
 
Blueberry pie is best when it is firm and you can hold in your hand. Smell it. And smell this tiny ad:
A rocket mass heater is the most sustainable way to heat a conventional home
http://woodheat.net
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!