Post by manuel on Nov 27, 2016 4:06:08 GMT -8
Hello again.
Now it's time to build a RMH for a 2 story house we've rented on the small and beauty village we live on.
Each story has about 65m2 but on the first one we only need to warm about 40m2. It's an old stone house with bad isolation. We've just instaled 8cm rockwool insulation over the upper ceillings, hope it will we enough.
I do have to install double glass on windows (aluminium, bad ones) and cover some gaps and make a double door at he principal entry of the house (excuse me, I don't know how to call this). And we've taken the plaster-ceiling over the hall and the saloon off, so the heat could warm the wooden floor upstairs on our bedroom and "chill-out".
Only the gray shaded surface on the plan should be heated. Rest are pantry and warehouse. To the left there is the garage.
We made a nice deal with the owners of the house so we'll pay 5 years renting with the work we'll make on restoring the house and building the heater, but we're short of cash and need to make it cheaper as we can while good as we're able within our possibilities.
What we do need:
-Some fast heat 'cause from time to time we go out for some 3-4 days. And winter is cold here and the house can easily go below 8ºC when there's no heat inside.
- Heat trapping, so we don't need to keep it burning all day long (that's what people use to do here at winter with diesel or coal and wood heaters) and have the house comfortable at mornings when we wake-up.
What we do have:
- about 8m height draft, 6" flue exit on the roof with the last 1m on double-wall inox.
-Small footprint for benches (the system I'm comfortable with just because that's what I've built and proved so far). The saloon (bottom right on the plan) will be a massage-room and need all abailable free space and MUST be warm enough for people to feel good with just some towel over their body (my wife is a therapist). This should be by far the warmest place on the house, that's why I've designed the stove with the box inside the saloon and a "window" for the barrel. Our bedroom will be just above the saloon so I hope it will feel nice at night and mornings.
- Small budget
- Some experience on RMH (this will be the 6th I think...)
- Lots of great clay around.
With those ingredients and having read we should need between a 15 to 20Kw heater to warm our house (depending on how well I'll manage to isolate weak points) I do think a 6" batch box with a part-covered barrel and a cob bell totaling 5,3m2 ISA would be good enough.
The cheaper way to make the bell is building a simple metal box and "cob'ering" it with as much cob as it is feasible. I though even on making all (just a box without barrel) in one metal bell and letting some area uncovered so we'll have fast heat when arriving home after some days out.
Making the bell with metal would allow us to use the heater just as soon as we install and seal the joints, and to cover it cob day by day.
- Do you think it's a good idea? Any other experience about making bells with metal sheet covered with cob? (appart from barrels)
- The one-box-metal-bell would suffer too much the high temperatures when covered in thick cob on the upper side?
- For the exhaust gases to the chimneys could we just put a metal-flue INSIDE the bell down to the bottom?
Would it need to be isolated or would it be good to trap some more heat before leaving the bell out to the exit?
Enough for now. Too many doubts for a project I should be building... yesterday?
Excuseme once more for my english writing and for not having good sketches. I'm too lazy for learning how to use sketchup. And I know I should learn it someday..
And one more time, again, thank you all! Have a nice day
Project gallery
Now it's time to build a RMH for a 2 story house we've rented on the small and beauty village we live on.
Each story has about 65m2 but on the first one we only need to warm about 40m2. It's an old stone house with bad isolation. We've just instaled 8cm rockwool insulation over the upper ceillings, hope it will we enough.
I do have to install double glass on windows (aluminium, bad ones) and cover some gaps and make a double door at he principal entry of the house (excuse me, I don't know how to call this). And we've taken the plaster-ceiling over the hall and the saloon off, so the heat could warm the wooden floor upstairs on our bedroom and "chill-out".
Only the gray shaded surface on the plan should be heated. Rest are pantry and warehouse. To the left there is the garage.
We made a nice deal with the owners of the house so we'll pay 5 years renting with the work we'll make on restoring the house and building the heater, but we're short of cash and need to make it cheaper as we can while good as we're able within our possibilities.
What we do need:
-Some fast heat 'cause from time to time we go out for some 3-4 days. And winter is cold here and the house can easily go below 8ºC when there's no heat inside.
- Heat trapping, so we don't need to keep it burning all day long (that's what people use to do here at winter with diesel or coal and wood heaters) and have the house comfortable at mornings when we wake-up.
What we do have:
- about 8m height draft, 6" flue exit on the roof with the last 1m on double-wall inox.
-Small footprint for benches (the system I'm comfortable with just because that's what I've built and proved so far). The saloon (bottom right on the plan) will be a massage-room and need all abailable free space and MUST be warm enough for people to feel good with just some towel over their body (my wife is a therapist). This should be by far the warmest place on the house, that's why I've designed the stove with the box inside the saloon and a "window" for the barrel. Our bedroom will be just above the saloon so I hope it will feel nice at night and mornings.
- Small budget
- Some experience on RMH (this will be the 6th I think...)
- Lots of great clay around.
With those ingredients and having read we should need between a 15 to 20Kw heater to warm our house (depending on how well I'll manage to isolate weak points) I do think a 6" batch box with a part-covered barrel and a cob bell totaling 5,3m2 ISA would be good enough.
The cheaper way to make the bell is building a simple metal box and "cob'ering" it with as much cob as it is feasible. I though even on making all (just a box without barrel) in one metal bell and letting some area uncovered so we'll have fast heat when arriving home after some days out.
Making the bell with metal would allow us to use the heater just as soon as we install and seal the joints, and to cover it cob day by day.
- Do you think it's a good idea? Any other experience about making bells with metal sheet covered with cob? (appart from barrels)
- The one-box-metal-bell would suffer too much the high temperatures when covered in thick cob on the upper side?
- For the exhaust gases to the chimneys could we just put a metal-flue INSIDE the bell down to the bottom?
Would it need to be isolated or would it be good to trap some more heat before leaving the bell out to the exit?
Enough for now. Too many doubts for a project I should be building... yesterday?
Excuseme once more for my english writing and for not having good sketches. I'm too lazy for learning how to use sketchup. And I know I should learn it someday..
And one more time, again, thank you all! Have a nice day
Project gallery