Post by rbpdpb on Dec 2, 2021 10:14:32 GMT -8
Hi all,
Putting together thoughts for a heater design, going into a 16x20 converted stable studio apartment, attached to main farmhouse. Floor is already 4" clay w/ hot water radiant tubing.
Heater will be in a corner location, and I'd like to incorporate:
- hot water boiler coil (for in-floor radiant heat);
- bread/ pizza oven;
- heated bench;
- fire view door.
What I've come up with is:
- modified J-tube core (feed is angled toward the riser and accessed through a hopper door above a glass fire-view window, maybe fixed, with primary air controls below that);
- barrel will consist of 1/ masonry shelf top above riser, that also serves as the floor of the pizza/ bread oven; 2/ (scrounged) @ 1/4" thick steel pipe, Schedule 5 or 10, of sufficient diameter to maintain CSA of 6" sq system - thinking that's about 12" pipe?
- boiler coil wrapped around outside of barrel, 1/2" soft copper, spiraling down the whole length to spread out thermal extraction;
- vents at bottom of barrel into first bell;
- first bell is a larger concentric 'barrel,' enclosing primary burn barrel/ core, that allows hot gases to rise and surround bread/ pizza oven; This bell might be large clay flue tile, either circular or rounded reclangular; I think 16" square clay tile would maintain approximate CSA?
- bread/ pizza oven is small domed masonry enclosure with feed door protruding through outer bell, on top of hopper/feed door, which is on top of fire view glass - 3 stacked doors; hot gases surround domed masonry; again, bottom of oven is top of riser barrel;
- cooler gases vent through bottom of first bell, wrap around a wood dryer opening under the firebox, and travel into an attached bench;
- bench is final bell, and it is split in two by a single masonry structural support for the seat that directs gases to the end of the bench, doubling back through the bench back, and then into the chimney outlet, which runs up and out past the big bell, warming gases sufficiently to maintain draft;
- bypass installed from top of big bell into chimney to bypass wood dryer and bench exchangers on startup.
Hope this isn't too confusing. Would love any thoughts/ feedback before I start cutting anything.
My basic thought is, keep heat sinks thin-ish to maintain heat of gases through to the bench bell. So:
- fairly thin masonry barrel top/ oven bottom - 3/4" kiln shelf? pizza tile? soapstone? What will store good heat and not burn away, but not crack??
- fairly thin steel barrel - 1/4" or so, like a steel stove - thick enough to not burn away, but thin enough to warm up fairly quick and transfer good heat into boiler coil wrapped outside;
- I'm worried about clay tile flue liner as first bell - I think those walls are @ 1.5" thick, which is a pretty substantial mass. But, I like that the square cross-section would give me a flat face to mount 3 doors to (note: drawing shows cylindrical bell, not rectilinear); and I like the simplicity and aesthetics of a single terra cotta tile as the primary visible element;
- I'm thinking wood dryer below firebox will support weight of both barrels, so significant verticals - maybe 4" solid cinderblock? Insulative enough to keep heat flowing, but massive enough to warm/ dry wood?
- Whole stove assembly will sit atop old kiln top, which is 2.5" thick insulating firebrick; not much of a sink there;
- bench bell will likely be native stone with clay mortar, stone seat of some kind. I will not have flue pipe, like a cob bench, but I am thinking that a single bench support between the seat and the bench back could effectively force warm gases to the end of the bench and then into the bench back; so kind of a 'divided' bell.
I guess that's it. Again, any feedback at all welcome. (Love this board!)
Rolf in MA
Sketch here:
photos.app.goo.gl/1vjwKyZFyhMo6KKR8
I think I figured out image, inserted below:
PS
I am imagining firing this stove long enough to lift water temps of storage tank for in-floor heat to a certain level - 120°? 140°? Guess that would depend on weather and other real life considerations. Point is: one major function of the heater is as water boiler.
Putting together thoughts for a heater design, going into a 16x20 converted stable studio apartment, attached to main farmhouse. Floor is already 4" clay w/ hot water radiant tubing.
Heater will be in a corner location, and I'd like to incorporate:
- hot water boiler coil (for in-floor radiant heat);
- bread/ pizza oven;
- heated bench;
- fire view door.
What I've come up with is:
- modified J-tube core (feed is angled toward the riser and accessed through a hopper door above a glass fire-view window, maybe fixed, with primary air controls below that);
- barrel will consist of 1/ masonry shelf top above riser, that also serves as the floor of the pizza/ bread oven; 2/ (scrounged) @ 1/4" thick steel pipe, Schedule 5 or 10, of sufficient diameter to maintain CSA of 6" sq system - thinking that's about 12" pipe?
- boiler coil wrapped around outside of barrel, 1/2" soft copper, spiraling down the whole length to spread out thermal extraction;
- vents at bottom of barrel into first bell;
- first bell is a larger concentric 'barrel,' enclosing primary burn barrel/ core, that allows hot gases to rise and surround bread/ pizza oven; This bell might be large clay flue tile, either circular or rounded reclangular; I think 16" square clay tile would maintain approximate CSA?
- bread/ pizza oven is small domed masonry enclosure with feed door protruding through outer bell, on top of hopper/feed door, which is on top of fire view glass - 3 stacked doors; hot gases surround domed masonry; again, bottom of oven is top of riser barrel;
- cooler gases vent through bottom of first bell, wrap around a wood dryer opening under the firebox, and travel into an attached bench;
- bench is final bell, and it is split in two by a single masonry structural support for the seat that directs gases to the end of the bench, doubling back through the bench back, and then into the chimney outlet, which runs up and out past the big bell, warming gases sufficiently to maintain draft;
- bypass installed from top of big bell into chimney to bypass wood dryer and bench exchangers on startup.
Hope this isn't too confusing. Would love any thoughts/ feedback before I start cutting anything.
My basic thought is, keep heat sinks thin-ish to maintain heat of gases through to the bench bell. So:
- fairly thin masonry barrel top/ oven bottom - 3/4" kiln shelf? pizza tile? soapstone? What will store good heat and not burn away, but not crack??
- fairly thin steel barrel - 1/4" or so, like a steel stove - thick enough to not burn away, but thin enough to warm up fairly quick and transfer good heat into boiler coil wrapped outside;
- I'm worried about clay tile flue liner as first bell - I think those walls are @ 1.5" thick, which is a pretty substantial mass. But, I like that the square cross-section would give me a flat face to mount 3 doors to (note: drawing shows cylindrical bell, not rectilinear); and I like the simplicity and aesthetics of a single terra cotta tile as the primary visible element;
- I'm thinking wood dryer below firebox will support weight of both barrels, so significant verticals - maybe 4" solid cinderblock? Insulative enough to keep heat flowing, but massive enough to warm/ dry wood?
- Whole stove assembly will sit atop old kiln top, which is 2.5" thick insulating firebrick; not much of a sink there;
- bench bell will likely be native stone with clay mortar, stone seat of some kind. I will not have flue pipe, like a cob bench, but I am thinking that a single bench support between the seat and the bench back could effectively force warm gases to the end of the bench and then into the bench back; so kind of a 'divided' bell.
I guess that's it. Again, any feedback at all welcome. (Love this board!)
Rolf in MA
Sketch here:
photos.app.goo.gl/1vjwKyZFyhMo6KKR8
I think I figured out image, inserted below:
PS
I am imagining firing this stove long enough to lift water temps of storage tank for in-floor heat to a certain level - 120°? 140°? Guess that would depend on weather and other real life considerations. Point is: one major function of the heater is as water boiler.
