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Post by shilo on Mar 16, 2015 15:10:06 GMT -8
the blue is insulation. the ISA is 5.9? please correct me.Untitled.skp (114.63 KB)
what do you say about this, filled with concrete, under the floor? the batch box is 170mm
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Post by satamax on Mar 17, 2015 2:06:25 GMT -8
Shilo, i've drawn one like this at permies, at some point, using flues instead.
One word of caution, without a proper chimney, it's hard to get the batch rocket to draft downwards.
I've had trouble with it. The wofati at Wheaton labs has the same problem. And i know someone else had the same kind of trouble. The batches don't like to have the flues going downwards.
What i thought previously, is, if you implement a slab rocket, it would be nice to use a big 8 incher J or more, and make the mouth of the feed tube flush with the ground. Barrel would be at a nice cooking height. And you could brush débris and dust in the burning rocket, from the floor. This would be nice. Exept for lighting.
Remember, you have tu insulate on the perimeter of your concrete slab, but also underneath. Radiation travels in all the directions.
HTH.
Max.
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Post by shilo on Mar 17, 2015 2:26:29 GMT -8
I thought the same. but I need a lot of ISA
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Post by shilo on Mar 17, 2015 2:34:39 GMT -8
it go only 20 cm downwards more then usually. of course, I will put a proper chimney. (only 4-5 meter but mostly inside the house)
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Post by shilo on Mar 17, 2015 2:40:09 GMT -8
of course.
any idea what type of insulation is best to use? something that will not squeeze under the wet concrete pressure.
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Post by shilo on Mar 17, 2015 2:44:57 GMT -8
am I right I can ignore the insulated section from the calculation?
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Post by shilo on Mar 17, 2015 2:54:08 GMT -8
shilo Avatar
Mar 17, 2015 12:26:29 GMT 2 shilo said:
What i thought previously, is, if you implement a slab rocket, it would be nice to use a big 8 incher J or more, and make the mouth of the feed tube flush with the ground. Barrel would be at a nice cooking height. And you could brush débris and dust in the burning rocket, from the floor. This would be nice. Exept for lighting.
I thought the same.
but I need a lot of ISA
I had one more crazy idea: underfloor batch box! with the door on the top
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Post by satamax on Mar 17, 2015 3:13:06 GMT -8
Shilo, dry sand could work as bottom insulation. Or air entrained concrete. As usual, you don't account for the floor in a bell. For the flue drop from the batch, mine was droping about 50cm, prety much the same for the wofati one i would say. The other one was droping even more. And for the buried batch, i'm dubious, this would be asking for trouble, imagine the smokeback! Tho, if you could make a step in the room, you could do a front load, and a top window flush with the floor. That would be "cracking" (british way of saying it would be super, real cool) Imagine Peter's inovator gathering's batch, with the top window flush with a huge bench, making a diferent level floor.
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Post by shilo on Mar 17, 2015 4:18:18 GMT -8
I refer to the 1 meter of the half barrel that completely in insulation (it will be under a piano)
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Post by matthewwalker on Mar 17, 2015 7:21:14 GMT -8
I would ignore the insulated section, but not push the overall volume too much. I think a top loader would be fine with regards to smoke. I don't imagine it would be any worse than a regular batch, just don't open it until it's coals which is how to run them anyway.
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Post by shilo on Mar 17, 2015 8:38:31 GMT -8
and air from the top?
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Post by matthewwalker on Mar 17, 2015 8:40:28 GMT -8
I'd probably plumb it to the appropriate location, depending on firebox design.
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Post by shilo on Mar 17, 2015 19:27:23 GMT -8
This is quite frightful to a house with children
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