This is my first ever RMH build. This is a solo experience, going slow, one baby step at a time.....
I have the current photos and a video of this Greenhouse RMH build on our fb page @ https://www.facebook.com/media/set/?set=a.429351400608072.1073741842.152019108341304&type=3
Test burn #1 was a fail. Heat riser was not sealed at the joint of the burn tunnel causing massive smoke blow back into greenhouse. Repair was made to heat riser and burn tunnel joint using fire and heat rated commercial mortar and more clay slip was added to all exterior joints of heater components at seams.
Test burn #2 was more of a success. However, I think I'm experiencing too much smoke blowback in the burn chamber. I realize that the system is still in open air and not completely sealed off with the heat mass but here are my questions at this point.
- is there an optimum length of burn tunnel. I've seen a lot of 24" tunnels so that is the length of this burn tunnel?
- could the burn tunnel length be a symptom of smoke blow back, again, I understand the system is not completely sealed yet
- what are some of the reasons for smoke blow back
- I don't see many folks using this fire rated red clay chimney liner as RMH material. Any ideas or experience, why???
Monday morning 1/18/16 7:00AM. Outside temp 27F, Inside Greenhouse temp 34F with no heat.
Test burn #3 fire started in about 3 mins. within 10 mins inside greenhouse temp was up to 42F. Still too much smoke bowback in burn chamber. I am using the construction lumber scraps so possibly the wood has moisture in it that is steaming back but no the flame is licking up about 6" in the air above the top lip of the burn chamber
- aahhh... clay chimney liner, I think I heard an expansion ---POP--- inside the riser barrel. Also, I see a crack forming at the corner of the burn chamber which is also the clay chimney liner.