marty
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Posts: 6
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Post by marty on Jun 18, 2015 16:28:33 GMT -8
My RMH will primarily heat my steel hot tub and subsequent 1200sqft greenhouse (by way of a water wall where the exhaust gases will flow through.) I am constructing my 8" core and heat riser out of perlcrete/sodium silicate/rockwool/fireclay mix...... following the Van deBerg design and inserting a trip wire and kick tail.the core will have 6" insulation. the heat riser will have 3.5" insulation and will be firing directly onto my steel hot tub floor. this floor is 6ft in diameter and will always have water (950litres) in it while lit. My "barrel" will consist of the tub floor for the barrel lid, and either sheet metal or fireclay/perlcrete ( depending on further research) for the walls.....in the end, i want to heat the tub water fast so I assume I must insulate the barrel to increase the temp inside the barrel.The real unknown factor I must figure, is whether or not my heat riser can be on an angle (20degrees) from the core. you see, because of the sheer size of my tub/barrel a typical j tube via Van Deberg design would mean me being under the base of the tub for feed tube if my riser is totally vertical. I really dont want to be crawling under the tub to tend the heaters fuel. Do you know if the heat riser can be angled at all? thanks, Marty Attachments:
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Post by shilo on Jun 18, 2015 20:59:43 GMT -8
"Do you know if the heat riser can be angled" no problem/ search for the broken riser thred
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Post by peterberg on Jun 19, 2015 0:24:24 GMT -8
Looking at your mold, the trip wire seems enormous. According to some computer models that came by, the maximum height of this feature is 6 mm or 1/4". Any higher and the turbulence will be too much, causing drag instead.
Also, the feed tube shouldn't be at an angle. The angle will cause the fuel to slide in the tunnel and that hampers the clean burning slightly. Unless my interpretation is incorrect and the riser side is angled. In that case, the trip wire is in the wrong direction, it should be pointing to the riser.
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marty
New Member
Posts: 6
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Post by marty on Jun 19, 2015 1:08:08 GMT -8
broken riser thread cannot be found Shilo...peterberg,I will take your advice and decrease the tripwire to cpu specs. Also going to reconstruct the feed tube totally vertical. I am still in need of" someone" with experience to tell me if the riser performance will suffer from being angled 20 degrees back.
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Post by peterberg on Jun 19, 2015 2:55:25 GMT -8
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Post by Daryl on Jun 19, 2015 4:32:12 GMT -8
I built one of these little bent risers years ago to feed into an oven. It was brick and not the main kind but I was testing out different things. Here's a warning: the joint will get really hot.
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Post by shilo on Jun 19, 2015 6:17:54 GMT -8
peter, in my opinion, the angel is mainly because the perspective of the camera
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marty
New Member
Posts: 6
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Post by marty on Jun 19, 2015 12:53:02 GMT -8
the tripwire is 1" and the feedtube is offset 15 degrees....both will be redesigned
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marty
New Member
Posts: 6
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Post by marty on Jun 19, 2015 14:02:26 GMT -8
can anyone tell me if it is a good idea to include sodium silicate to my perlcrete to insulate the firebox and heat riser?
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marty
New Member
Posts: 6
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Post by marty on Jun 19, 2015 20:08:53 GMT -8
Another important question I have is this: If I am building an 8" RMH what is the ideal exit port size for my barrel?
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