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Solarium Pebble Style RMH

Posts: 451
Location: Inter Michigan-Superior Woodland Forest
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Didn't want to clutter up the thread on the 3D plans for the RMH by the Solarium, but have some follow up questions. I've watched the abridged Free Heat movie and am going back and watching the full video on this when I have a better net connection, but am designing something along these lines to install ASAP before winter sets in hard so looking for some summary information.

paul wheaton wrote:

Coydon Wallham wrote:

paul wheaton wrote:The size of the bench was decided and that led to the length of the duct.

How has the efficiency been? Seems like a short run that would send lots of heat out of the exhaust. Does the juice box mitigate that enough? How much longer could the duct be while using the juice box design?

If we are talking about a six inch system using an 8 inch duct - it can be very long.  

If we are talking about an eight inch system, the total length of duct could be about 60% longer (guessing).

So I'm wondering about this particular 8 inch system with the 6 inch vertical exhaust at the end. Is this considered a juice box and/or stratification iteration (guessing yes because of how the vertical duct was inserted into the horizontal rather than a simple join)? Are there any promising theories/data on how this combination affects the overall draw?

My working plan is a similar design, only instead of a rectangle bench with the duct doubling back at the end like we have here, I'd run the duct in a large hex or octagon ring leading back to a vertical exhaust next to the barrel. I have been thinking about 40' of duct with an 8' exhaust, using a 10' fudge factor to ensure draw. Does the 6" exhaust seem to provide any benefit over what an 8" would?
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