William Bronson wrote:Your diagram shows the bedrooms rather far from the RMH.
Is the RMH supplemental heat, or primary?
Satamax Antone wrote:http://heatkit.com/research/2009/lopez-rocket.htm
Satamax Antone wrote:What is your plan for the rocket size?
Because, 3.9m long. Lets say 2.15 m high, or so . Internally, 3.7x2, X2, plus the ends, you're already at more than 15 m². That's a lot of surface for a bell.
I'm about 11m² altogether, with a 220mm batch rocket. When hot at 45C° on the outer skin, which takes a good 5 hours burning. it takes 2 whole days to cool down to ambient (usually around 13C°)
So, you need a big rocket to power what you are planning.
Satamax Antone wrote:It's not juste heating cooling time.
In a bell, you have inside, the heat extraction surface. Called internal surface area, or isa. If the surface is too big, all the heat is extracted, and there's no power left to maintain the draft. Thus leading to smokeback. Besides this, there's mass. And outside radiating surface. Once you have read all this, you might be sort of up to date.
Satamax Antone wrote:Augustin, don't do this with pipe. It's more trouble than gain. You said wall, hence the estimated height of 2m inside.
If you do this do a batch and bell wall. The same type of wall i showed you in the lopez lab link. I think it would be better.
2.63m3 of cob is huge. about 5 tons. If you do this as wall, with the dimensions given,
You would have about 8m², of ISA with 20cm walls. So 200mm batch rocket. You could increase the size of your bell a bit
There's one detail, which buggs me. Your outside wall. What is your plan? Do you really want to heat the greenhouse the same as the house, or you want less heat in there? Because, walls of a bell, of more than 20cm, take a lot of time to heat up
Satamax Antone wrote:Augustin, i was advising to make a eight batch. But i was saying your bell was kind of sized right.
14kg of wood, is equivalent to 3 steres, or about one cord for the heating season. I'm very dubious one can heat with as little wood as this.
Well, the first thing, if you want to get the grasp, is to make a cooking J tube rocket.
Satamax Antone wrote:I was talking about building a temporary outside one. To get how a j tube works
I'm not a fan of normal j tubes. They are a hassle to feed.
But i might have a simple solution for you. If you switch to bench.
Satamax Antone wrote:Most efficient, batch and Bell.
Is your house built?
Satamax Antone wrote:Augustin, postwise, it's better to make a new post, quoting your first one, and showing the differences, rather than editing an old post, which might mess the thread up. Hth.