Hi everyone, first time poster, in the research stage of my RMH build.
I'm living part time in Bulgaria and part time in the UK.
Bulgaria will be where I'll get to build my RMH, the chimneys built into the house are 130 mm (or 5.12"), I have a wood burning stove in one of 5 rooms on the ground floor of a 2 story house, (we live downstairs in the winter, as the stairs are external, and closing off the upstairs and living downstairs make more sense).
Having read enough to know that the necked down point should lay the basis for J shaped RMH, that gives me 20.588 "sq for the flues.
Fire bricks available are 230 x 114 x 75 mm (or 9" x 4.5" x 3"* just under 3"), so if I start the front of the J with a brick stood on end 4.5" wide, with sidewalls 2 bricks high, and make the feed tube and riser, 4.5" square shaped (or 20.25"sq), that will mean the 3rd layer of bricks will be interlocked, and the sidewalls can be bonded with 1/2 brick on layer 1, (at each end), and full bricks on the 2nd layer.
1) With the 20.25"sq feed and riser, and burn chamber, how long should the burn chamber be?
2) How tall should the riser be?
3) Is there a formula for the length of piping this will be able to feed heat through the mass?
4) There is also an old fireplace in one of the rooms, I don't know the diameter of the flue on this chimney, is it better to think about a build with a 6" system and vent through this chimney, or go with the 4.5" system and vent throuch the 5" flue in the wall?
Apologies for the long winded multiple question first post...so many questions, so much information, so little time.
p.s. I have the "build bible" on order, just waiting for delivery, and can't sreep for all the questions going round and round in my brain.