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Post by esbjornaneer on Jan 10, 2018 1:50:55 GMT -8
A peterberg DSR workshop heater with barrel bell and matthewwalker barrel bench. Made for the sowing table of a yurt making workshop. SketchUp here and V8Some pics: The door and secondary air is still waiting to be made. And even though it is still all wet it burns fine. The reason for the extra bricks in the fire box is to elevate the small fire towards the port, they will be removed once it is dry and full loads are burnt. The bench is under the table to work as a 'mesa camilla'/'brassero'/'under table heater' traditional here in southern Spain.
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Post by esbjornaneer on Jan 10, 2018 1:59:45 GMT -8
It uses Refractario Andalucia, heavy fire bricks without insulation as it is intended to keep burning (more or less) continuously due to the workshop space being very large and there being lots of scrap wood from the yurt making process.
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Post by peterberg on Jan 10, 2018 2:29:08 GMT -8
I opened the SketchUp file. The bricks are 220x110x40 mm as I understand it. Height of the top box is a bit much but better than too cramped. Secondary air is very important and a proper door will make a world of difference. You didn't cater for a make-shift door out of bricks so you are unable to find out the right air openings in advance for your setup. Remember, the primary/secondary air proportions should be close to 50/50. When fired all the time the primary air could be even less.
Wish you succes!
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Post by esbjornaneer on Jan 10, 2018 4:32:33 GMT -8
Thank you Peter! Yes that is the size of the bricks. To mitigate for the high top (2nd) box we added a slab/layer of clay/ash/sand mortar to the bottom of it so the 180mm height was observed.
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Post by coastalrocketeer on Jan 10, 2018 6:30:42 GMT -8
Love it E! Hit me up here or on pm as appropriate if you want to chat about it or bounce ideas off me!
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Post by Orange on Jan 10, 2018 7:04:36 GMT -8
nice! How come you've chosen DSR over classic BB?
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Post by drooster on Jan 10, 2018 9:37:33 GMT -8
It uses Refractario Andalucia, heavy fire bricks ... Those are very pretty bricks, artistic.
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Post by esbjornaneer on Jan 10, 2018 9:47:24 GMT -8
Orange there are several reasons, not order of priority: If I had a BBR the visible barrel would not work as a bell unless it were higher up heating the roof rather than the person sitting at the table sowing. And the fire box can be higher (~450mm off the floor in this case) and the top of the barrel is still only ~1750mm from the floor. The workshop owner wants to burn continuously, which can be done in a BBR but only with large dimention logs after it has heated up. I am not sure if that is the same for the DSR but it was not mentioned when talking about the 10hrs continuous burn test of the DSR. In my own house the seilings are low in our main rooms and that was a limitation for me when building my current heater so wanted a DSR to be able to put one in at home at a later date. The DSR core uses 51 bricks of this kind and the BBR core uses 60. I like the option of greater visibility of the flames. There is not a glass in the top box here yet but I understand it is being ordered. And if an insulated core was done it would require less insulation as the external surface area of the DSR core is much smaller than the BBR as its afterburn/heat riser is standing out from the fire box. Those are the reasons I can come up with, without trying hard...
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Post by Orange on Jan 10, 2018 12:41:02 GMT -8
I'm glad it worked out for you. Peter must feel relieved I can't open the .skp but I think BB height would be the same with 40cm elevated firebox + 100cm riser + 30 cm top gap to barrel = 170cm. I have 2 Q's: what's the exist flue temp and mortar composition?
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Post by peterberg on Jan 10, 2018 13:22:34 GMT -8
The workshop owner wants to burn continuously, which can be done in a BBR but only with large dimention logs after it has heated up. I am not sure if that is the same for the DSR but it was not mentioned when talking about the 10hrs continuous burn test of the DSR. Tomás used fairly large pieces, something like 80x80 mm across but about 80 to 100 mm shorter in length than the depth of the firebox. One reason to use this configuration: it's a dead simple build. It's not as good as the BBR in converting CO to heat, water and CO² though. But it's doing surprisingly well in the low soot department. The white round Testo filters here at home were not black or grey at all, more like very, very faint brownish. Last week I opened up the heavily tested two barrels system and there's no soot at all inside. Even when I sniff at the open barrel itself there's no scent of wood tar.
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Post by esbjornaneer on Jan 11, 2018 11:57:24 GMT -8
Orange , the difference is that I have a 568mm top gap with the DSR. Flue temp was cold to the hand when it was tested the day it was totally wet and just completed, there will be a more interesting flue temp in a couple of weeks to a month when it is much drier. Mortar was 1 part potters clay, 1 part sieved ashes, 4 parts sieved builders sand + water to desired consistency. peterberg, I've quickly been through your DSR thread without seeing any Testo results. What is the difference in efficiency?
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Post by peterberg on Jan 11, 2018 13:39:07 GMT -8
peterberg , I've quickly been through your DSR thread without seeing any Testo results. What is the difference in efficiency? Efficiency is due to temperature and level of O² in the exhaust gases. Overall efficiency is excellent, the CO level could be lower. Here's a diagram of a testrun at home inside my workshop. Development of this burn isn't very good but as I said, soot production is very low.
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Post by Deleted on Jan 12, 2018 12:05:27 GMT -8
Very nice, peterberg ! Exit temperature are so low and the heater is still burning well, that's impressive ! Have you measured the initial (draft, temperature) values in your setup ? Right before the beginning of the fire. With my analyser I have to unplug it from the computer, measure the draft, and then plug it again. Also have you measured a 'tipping point' for the DSR ? What is the ISA of your system with these values ? Regards,
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Post by peterberg on Jan 12, 2018 12:57:22 GMT -8
Very nice, peterberg ! Exit temperature are so low and the heater is still burning well, that's impressive ! Have you measured the initial (draft, temperature) values in your setup ? Right before the beginning of the fire. With my analyser I have to unplug it from the computer, measure the draft, and then plug it again. Also have you measured a 'tipping point' for the DSR ? What is the ISA of your system with these values ? Regards, I checked whether I measured draft but I didn't, sorry. I can only measure the draft in advance but it will be in the spreadsheet when testing is done. Didn't measure tipping point, I am unsure how to do that. Did I forget something? Getting old? Oh my dear! The system size is roughly 120 mm equivalent with a matching ISA of 3.3 m².
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Post by coisinger on Jan 12, 2018 13:41:39 GMT -8
The stratified bench appears to be catching on fast. I see this as a much simpler option to running flue pipe and packing it in with mass. Nice work!
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