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Post by Deleted on Jan 13, 2018 1:21:24 GMT -8
Hahaha peterberg, OK I get it..even time needs time ! Regards,
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Post by esbjornaneer on Jan 13, 2018 1:23:35 GMT -8
Thank you coisinger . peterberg I think I am not understanding what you are saying about it being a '120mm equivalent'. Is the core you are testing and showing the graph for the same dimentions as in A very different batch core, no riser at all but with a 120mm chimney (I understood from that thread it was intended to go with a 150mm chimney), or have you scaled the core down from what you reported in the linked thread?
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Post by peterberg on Jan 13, 2018 1:37:19 GMT -8
I scaled the core down.
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Post by esbjornaneer on Feb 19, 2018 4:35:52 GMT -8
There have been issues with this build.
I know that the chimney we have is not ideal, and I have come to the realisation that I probably gave it too much ISA! But it did not get the heat up in the chimney to draw well and therefore kept smoking back. So I did all I could think of: Insulating the chimney, reducing the size of the barrel (i.e. ISA), then insulating what was left of the barrel. Still the same problem of burning well for 10-20 minutes then smoking back. As a last attempt before scrapping the whole DSR we added a loose stacked 220mm tall 150x150mm square internal chimney/HR ontop of the 2nd box, inside the barrel. And all of a sudden it kept the gasses going in the right direction! The bench only heated to ~40*C after 4 hours of burning.
The idea of the HR was the workshop owner's and I argued against it as the beauty of the DSR is that it is so low in height.
The bench did not heat up very well so the workshop owner moved the core to floor level without me. And in the process increased the height of the internal chimney/HR to 330mm (built with mortar) changed the size of the firebox slightly and did not put in the extra thickness in the roof/floor between 1st and 2nd box. And it now heats the bench much more quickly, 60*C after 2 loads of spruce and chestnut.
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Post by Orange on Feb 19, 2018 5:36:45 GMT -8
any pics/videos?
heat comming from the lower point is superior so you can still lower the 1st bell and put some insulation on top.
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Post by coisinger on Jul 26, 2018 10:42:28 GMT -8
With DSR construction, do the dimenstions of the internal heat riser still apply as in batch box construction?
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Post by peterberg on Jul 26, 2018 22:15:35 GMT -8
No, simply because there isn't a heat riser.
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Post by coisinger on Jul 27, 2018 4:22:49 GMT -8
Good to know. Is there a benefit or negative impact to having a short 'stack' on top of the second chamber?
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Post by peterberg on Jul 27, 2018 5:51:38 GMT -8
No negative impact as far as I know of, probably is one foot enough as that's what I used (by shear accident) in Montana last year.
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Post by esbjornaneer on Jul 27, 2018 6:53:22 GMT -8
coisinger Please read again my post of the 19th Feb in this thread. For this build it was necessary to have an 'internal chimney'/'heat riser' on top of the second box for it to work. If a standard batch box rocket (BBR) core could work for what you are planning that is what I would recommend for you rather than a DSR! Success in your endeavour, Esbjorn
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