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Post by mizzvicki on Jun 7, 2019 12:27:15 GMT -8
Hello! We could use some input as we plan out RMH. I am posting all of our questions at once, please comment if you have input that could be helpful. If my questions aren't comprehensible, please let me know. Thank you!
1) Is it acceptable to make the outer shell of the heat riser out of ferrocement (over the insulation)?
2) Same question but using fascia brick rather than ferrocement.
3) How do you design the J tube to allow access to replace the (forgot the specific name) first firebrick that often gets burned out?
4) If using Stainless steel pipe for the combustion chamber, how thick should it be?
5) Is anyone feeding exterior air into the burn chamber? If so, by what design?
6) Is t here any point to enclosing the exterior of the fire chamber with refractory mortar?
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Post by gadget on Jun 8, 2019 9:25:29 GMT -8
4) If using Stainless steel pipe for the combustion chamber, how thick should it be? 5) Is anyone feeding exterior air into the burn chamber? If so, by what design? I'll answer these two questions; 4) Don't use metal anywhere in the combustion area. RMH get way to hot for any kind of steel 5) I'm assuming by exterior air you mean secondary air. If you are building a classic RMH with feed tube, you typically don't need any kind of secondary air since the the fuel is burned from the bottom and the heat tends to not add extra pyrolysis of the wood. There is also some cooling from the air intake past the wood. Most people don't add extra air on RMH but it has been done with some success. If you have a very insulated feed tube that gets hot and starts pyrolysis on the wood higher up in the feed tube you may benefit from secondary air. Most people try to keep the feed tube cool in their designs to prevent this. Some have had success with a steel upper feed tube take gives off excess heat. That is as long as the steel does not extend down into the burn area to far.
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Post by esbjornaneer on Jun 13, 2019 1:58:56 GMT -8
Hello! We could use some input as we plan out RMH. I am posting all of our questions at once, please comment if you have input that could be helpful. If my questions aren't comprehensible, please let me know. Thank you! 1) Is it acceptable to make the outer shell of the heat riser out of ferrocement (over the insulation)? 2) Same question but using fascia brick rather than ferrocement. 3) How do you design the J tube to allow access to replace the (forgot the specific name) first firebrick that often gets burned out? 4) If using Stainless steel pipe for the combustion chamber, how thick should it be? 5) Is anyone feeding exterior air into the burn chamber? If so, by what design? 6) Is t here any point to enclosing the exterior of the fire chamber with refractory mortar? 2) Original J-tubes were built with old red bricks but see 1). 3) Think of how you will need access it in the future, make it easy, don't encase it on too much material. All self-evident really, but as you asked 4) I second gadget. Traditionally they are built with old red bricks or fire bricks. 5) Are you aware of the p-channel for j-tubes? (The image is from peterberg on this forum.) 6) If you decide to make the fire chamber out of a metal pipe expect it to burn away and then you would be left with the refractory mortar that you enclosed the pipe in. If you build the fire chamber with fire bricks you can lay them with refractory mortar or a clay based mortar, then you are better off encasing it in insulating material. But remember the ease of access for your 'first brick'. Hope this is of help.
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