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Post by mizzvicki on May 9, 2019 15:19:43 GMT -8
First post, thanks for having me!
New home construction, we are wanting to build the RMH near the center of the house and run a 8 inch pipe under the floor (in a channel walled with cinder blocks and filled with soil and rocks). We want to run it 25 feet to the north and then u-turn and run 50 feet to the southeast corner of the house where the chimney will be. We read an article where below floor heating was used in a greenhouse with the exhaust flue being a straight run 50 feet long. They used a fan to draw the air to the chimney because they wanted better control on the heat for the good of the plants. Because the length of our exhaust is 50 percent longer do we need to use a fan? Any other feedback?
Thank you very much! mizzvicki
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Post by keithturtle on May 9, 2019 21:53:25 GMT -8
New home construction
Checking with code inspector is the first place to start, then your insurance. Not sure about the fan needed
Turtle
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Post by fasardi on May 10, 2019 4:14:22 GMT -8
I`m not the more experienced in this forum, but according to Ernie and Erica`s book (someone correct me if i`m wrong) for a J 8" you can use a maximum of 50 feet of linear tubes, and for each 90º curve subtract 5 feet. And the tubes have to be of galvanized metal or something like that, they have to be as smooth as they can be for the flue to go that long. If youre planning on doing something bigger, i guess you`ll need a fan, or maybe a bypass to start the burn with a shorter flue, and when hot open it to run the whole system. Otherwise you are under the risk of having plenty of smokebacks.
Don´t know if you are planning on building a J tube, a L tube, or a batchrocket. I guess but i`m not sure, for an L tube will be the same. If you`re planning a Peter van den Berg`s Batchrocket, bells are recomended. You can check batchrocket.eu/en/building#belltheor to calculate it. Some have placed a water tank inside the bell, or a coil, to warm water and with that water you can have a radiant floor.
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Post by gadget on Jun 10, 2019 9:09:13 GMT -8
First post, thanks for having me! New home construction, we are wanting to build the RMH near the center of the house and run a 8 inch pipe under the floor (in a channel walled with cinder blocks and filled with soil and rocks). We want to run it 25 feet to the north and then u-turn and run 50 feet to the southeast corner of the house where the chimney will be. We read an article where below floor heating was used in a greenhouse with the exhaust flue being a straight run 50 feet long. They used a fan to draw the air to the chimney because they wanted better control on the heat for the good of the plants. Because the length of our exhaust is 50 percent longer do we need to use a fan? Any other feedback? Thank you very much! mizzvicki There was a youtube video that I can't find where they had ran there flue under the floor. I want to say it was incased into the cement. The result was a nice warm floor but only above where the pipe was. So basically, there floor was only warm in a strait line from the RMH to the chimney. He had a bypass blower for starts and warm ups that was in the chimney. Heat moves through cement much like cob at a slow rate. Now if you where heating an air space under a raised floor it may work better assuming you are insulating the ground below and the out side way does not leak air. Best bet for cement foundations is to run water coils evenly spaced through the entire pad. It must be insulated from the ground.
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Post by patamos on Jun 14, 2019 19:02:39 GMT -8
all kinds of variables here. check out AGS at amosclayworks.ca
Lars Hellbro pioneered a condensing flue and then another Dane (i think) added a fan on the end of a long run as you have described.
ONe issue is you don't want the fan to over run the residenbcy time of the burn chamber... which varies on load conditions...
best bet is to aim loow for the volume/minute. you pull throuhgh that set up and also have a regular updrafting chimney near by the fire box for easy start ups.
yes, best to bury the flue deeper than 1 foot. Speeding up the flow rate will help draw the heat along.
just a few of many thoughts rattlin round the back of my noggin...
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