Ken Carman :We have wasted a weeks worth of your time that we will work very hard to give back, in order for you to understand clearly the importance of keeping a Constant
Cross Sectional Area in the
Feed Tube, Burn Tunnel, the Heat Riser, and at the top and sides of the barrel, and match the size of your horizontal and vertical chimneys to the
size of every thing upstream you Need to go to
rocketstoves.com to get a PDF Copy $15. of Evans' book
Rocket Mass Heaters , there is STILL No other book in any
language with more
Rocket Mass Heater R.M.H. information! (I don't make a dime ) rather than
spoon feeding you the information you need Now, and do it question by question
you need to have this information at your finger tips to save you time and money !
I am afraid that a over large 10 inch diameter pipe would cause the flow of hot exhaust gases created earlier to become very sluggish, wasting the R.M.H.s ability to flow them
horizontally, any changes that we would have to make to use you 10'' pipe would require building a system much much to big for the size of your green house !
Any mass that is heavy will do for thermal mass,
People often make nuisance dumps of construction materials at the end of one way roads, old pieces of broken up
concrete can
be included, a phone call or two will find you a contractor who is redoing concrete driveways, side walks and steps who has run out of places to dump his spore, Make sure you
can use what you get, hauling it yourself over finding that 4 large dump trucks are sitting in your drive way, and a man is asking where you want all this fill !
Often within monolithic pores of concrete there is a center core of packed stones and gravel, I would call this a cheat to save on cement but was a common technique during and
after WW11, finding one of those might give you a glimpse of your regions history and a stone source !
All fill that is not cob can be planned for in advance, saving them for decoration after final placement of pipes has been found that worked for you during your out door test fire,
first everything gets coated with a layer of clay slip, followed by Cob, then your stones and broken pieces of concrete, presoaked in water and thin coated in clay slip to prevent
the trapping of air in your cob and finishing with stones and old brick from
job sites/ an old school, the end result should be both functional and beautiful !
Your best option so far would be to make your burn chamber and Heat Riser out of brick, stacking your fire brick on its side to promote height over thickness and then making an
insulative coat of clay slip and perlite outside of that. Be sure to give yourself at least 2'' of air space between the outside of your insulated Heat Riser, and the inside of your
barrel all around !
You may be able to find where old road materials were quarried from shell piles from ancient sea beds, still containing large pieces of ancient corral, this material a potter calls Grog,
and it makes for strong durable cob indeed ! Please get your copy of the book and come back here often to work towards your future R.M.H. for the Crafts ! Big AL !