Small J tube TMH for tiny cabin

[whazzatt]

Seems like J tubes may not be the most in-things anymore, but I had a go at one for my cabin anyway.

Riser is just over 10 cm diameter. Should be 10 cm because of the 15 cm diameter pipe plus 2,5 cm ceramic fiber blanket, but the blanket seems to have squashed a bit when I pushed it flat inside the pipe.

Burn chamber CSA is slightly bigger than the riser CSA. This was an accident because I made a few mistakes with sizing when constructing the mold for the core. But the unit works brilliantly and I'm glad I accidentally oversized the mouth.  

Gap between riser and top of drum is 3 cm.

The core is 45:40:15 clay:perlite:furnace-cement. Furnace cement was at least two years old. I had some glass rope lying around. I unraveled it into smaller strands and added these for structural integrity - seems to have worked really well. 

10 cm flue pipe chimney throughout, with 3 elbows in the system: 1 out the drum, 1 near the ceiling (second pic), and thereafter a 2m horizontal pipe ends with the final elbow to a 1.7m vertical section.   

[Orange]

looks cool but does it heat up a cabin a little bit?

[whazzatt]

Jul 2, 2019 7:21:15 GMT -8 Orange said:

looks cool but does it heat up a cabin a little bit?

You're kidding, right?

It pumps out the heat, and I'm just keeping the flame ticking over most of the time.

I suspect it would suffice for a space much larger than the tiny cabin it's in.  

Top few layers of bricks are nice and warm several hours after the burn ends too... 

[gadget]

pictures aren't loading for me

[wiscojames]

I see them

[whazzatt]

Jul 3, 2019 20:45:38 GMT -8 gadget said:

pictures aren't loading for me

This has happened in previous threads of mine. Like here - Link. 

I think someone mentioned that it may have something to do with the browser ones uses. Maybe try a different browser? Opera Mini played ball for one member, while Firefox didn't for another. 

[bombadyl]

Nice build !
What did you use exactly for the metal bell ? Looks like 2 steel trash bins clamped together ? Where did you procure them and found a clamp of the exact right size ?
Thanks

[whazzatt]

Jan 9, 2021 11:33:35 GMT -8 bombadyl said:

Nice build !
What did you use exactly for the metal bell ? Looks like 2 steel trash bins clamped together ? Where did you procure them and found a clamp of the exact right size ?
Thanks

Hi Bombadyl 

I found the steel bins/drums at a scrap yard. I bought about ten of them because I liked their size, and they each come with a clamp that seals a lid to the bin. I used one of the clamps to secure the two bins together. 

The bins were initially used for some kind of industrial chemical, I think. When I found them at the scrappy's, they were open and pretty clean from weathering. I burnt the bins on a fire-pit fire, and scrubbed them clean thereafter. 

You should be able to find a supplier of variously sized drums in most cities. Ask for one with a lid and a clamp. 

Hope that helps.

Dave