Post by dakman on Sept 22, 2016 18:56:11 GMT -8
Hi all. It's been a while since my last post. I have a simple problem. I have a soap stone wood stove on the main level of my home, and would like to passively get some of its heat, to a family room, located in the basement directly beneath the wood stove. I am wondering if the R.M.H. exhaust principle could be employed.
I would place a jacket, (The heat riser) around the chimney pipe of the wood stove. The annular gap, between the outer wall of the chimney pipe, and the jacket ID would be approx. 13 Sq. inches. The bottom of the jacket would be open. The top of the jacket would be closed, and would transition horizontally, outward from the chimney, approx. 18-20 Inches. (This horizontal transition could be akin to the top of the barrel, maybe.) Finally, the long leg of the J, would be a 4" dia. duct, which would run downward, through the floor, extending into the downstairs family room. (Resembling the horizontal duct of an RMH.)
Dimensionally, the chimney jacket would be approx. 5 Ft. tall. The length of the 4" duct would need to be at least 8.5 Ft. long, to get thru to the lower level, or better yet, 15 Ft. to get near the floor in the basement.
Regarding temperatures, I would expect that the outer skin of my chimney pipe gets near 250 Deg. F, and the temp in the basement is usually in the low 60's during the winter months. I realize that the temperature differential, is nothing in comparison to what is typically seen on a rocket mass heater, but I'm only looking to move a small amount of warm air, maybe 15 CFM or so, at 100 Plus Deg. F.
I have done a small scale experiment, using 8 Ft. of flexible aluminum duct, 3" dia. bent into an upside down J shape. By heating the outside of the short leg of the J with a hair dryer, I was able to get warm air, and smoke tracers from a smoke pen, to travel down the tube.
I am well prepared to build this unit to test, however, any wisdom that I could gather from this group beforehand would be deeply appreciated.
Thanks in advance.
Dakman
I would place a jacket, (The heat riser) around the chimney pipe of the wood stove. The annular gap, between the outer wall of the chimney pipe, and the jacket ID would be approx. 13 Sq. inches. The bottom of the jacket would be open. The top of the jacket would be closed, and would transition horizontally, outward from the chimney, approx. 18-20 Inches. (This horizontal transition could be akin to the top of the barrel, maybe.) Finally, the long leg of the J, would be a 4" dia. duct, which would run downward, through the floor, extending into the downstairs family room. (Resembling the horizontal duct of an RMH.)
Dimensionally, the chimney jacket would be approx. 5 Ft. tall. The length of the 4" duct would need to be at least 8.5 Ft. long, to get thru to the lower level, or better yet, 15 Ft. to get near the floor in the basement.
Regarding temperatures, I would expect that the outer skin of my chimney pipe gets near 250 Deg. F, and the temp in the basement is usually in the low 60's during the winter months. I realize that the temperature differential, is nothing in comparison to what is typically seen on a rocket mass heater, but I'm only looking to move a small amount of warm air, maybe 15 CFM or so, at 100 Plus Deg. F.
I have done a small scale experiment, using 8 Ft. of flexible aluminum duct, 3" dia. bent into an upside down J shape. By heating the outside of the short leg of the J with a hair dryer, I was able to get warm air, and smoke tracers from a smoke pen, to travel down the tube.
I am well prepared to build this unit to test, however, any wisdom that I could gather from this group beforehand would be deeply appreciated.
Thanks in advance.
Dakman