Mike Haasl wrote:Thanks Peter! Great video, wish I could speak French. So when you say "to a degree of success", does that mean it's a compromise that doesn't usually turn out as good as other methods? Or it's the best thing ever but it's a bit more work? Or neutral?
Mike Haasl wrote:I was mainly concerned with the interface between the steel of the modified wood stove and the masonry of the heater core. How do you make that connection air tight when the materials expand and contract at different rates...
Mike Haasl wrote:If I could cut the face off of a wood stove and bolt it to the front of a batch box, I can maybe see how I could use some wood stove rope gasket material to seal between them.
Mike Haasl wrote:Oh, one more question that kept me up last night. Does an 8" system need an 8" chimney? It seems like if the air inlet is 10 square inches (cold air) and the riser is ~50 square inches (very hot air), might the chimney just need to be 4-6" in diameter since it's transporting warm air?
Anne Miller wrote:Welcome to the forum!
I like the look of your greenhouse as it looks neat!
I hope one of our RMH Gurus will be able to answer your questions.
thomas rubino wrote:Hi Adam;
Welcome to Permies and Welcome to the wonderful world of rocket science!
I'll try to answer your questions.
#1) I suggest an eight-inch core over a six inch.
The feed tube size on a 6" is very restrictive, an 8" has much more room for crooked wood.
An 8" will also require less tending than the 6" and produce more heat.
Yes, 55-gallon barrels work with 6 or 8-inch rockets.
#2) Yes, you can use brick or even flat rock for the piped mass it has been done before.
As you want your heat to rise and not go down and heat the earth, you will want to insulate under your brick tunnel.
Perlite and clay with straw added is a good option, sand is another. Pebbles are prone to rolling and might not be a good choice underneath.
Here is a new line of thinking for you.
You can create a bell with 1/2 barrels and not use a tunnel at all...
You would still need to insulate below.
A cob mix would cover the barrels.
#3) The volume of your tunnel must match or exceed the volume of the feed tube, the shape does not matter.
Sloping your tunnel is not necessary.
My questions are, How are you planning on using this greenhouse?
Is it for early starts and late-season finishing?
How cold do your nights get and how warm are you hoping to keep it inside?
Were you hoping to run it all winter?
thomas rubino wrote:Here is a young Matt Walker describing the stratification system. https://www.youtube.com/watch?v=vXHmcKWfFw4
And a post comparing the two designs https://permies.com/t/154958/Split-barrel-bench-parallel-duct
And another https://donkey32.proboards.com/thread/1824/20cm-tube-half-barrel-indoor?page=1
Check it out and ask questions.