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Post by peterberg on Jun 18, 2015 9:29:00 GMT -8
Hmmm... This clay flue liners are excellent as... flue liner. Those aren't good for riser liner by the way, it will crack in no time and probably crumble as well. When used as liner of a bell, slit one side vertically and you stand a good chance to keep at as a whole. Don't make a tight fit because they'll expand during firing the heater.
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Post by gdauderman on Jun 18, 2015 9:49:05 GMT -8
ok so fire brick it is.
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Post by shilo on Jun 18, 2015 10:36:08 GMT -8
Also forgot to clarify if when you said 4" on the side, is that 4" per side - 8" total or 2" per side - 4" total? All around the riser 4", means 8" total. My new heater is growing, it's built in parts by a friend. Have seen it today and it looks enormous. All around the riser there's 9", under the firebox 11", top gap around 3'. Seeing this construction one would think "this probably won't work". The space between working excellent and not at all is presumably quite narrow with this heater. Time will tell which side of the demarcation line it will go. We are still some months away from completion. he is building a 8" heater.
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Post by fillymiff on Jul 6, 2015 8:57:42 GMT -8
Greetings All,
A question from a newbie. This may have been answered in previous threads or discussions but I have not been able to find it so here goes. Is it possible to convert or utilize a batch box as a continuous feed? I have used the 8" as a template and would like to find out if it would be possible to run it as a continuous feed. My plan is to take the heated air from the drums via an improvised heat exchanger and pipe it through a pipe column to dry a slurry. The fuel source is compressed sawdust logs.
I would be very grateful if there was someone out there to give me some guidance in this endevour.
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Post by buckeyenut on Oct 4, 2015 15:58:41 GMT -8
And if you don't have Excel or don't want to open a spreadsheet, here's a screenshot... View AttachmentAnd here's a cross-section of the stove: I have two questions about this graph. The calculated base. What does this represent? And two your riser height. Does the measurement start from the bottom of the batch box or the roof?
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Post by peterberg on Oct 5, 2015 12:25:06 GMT -8
The calculated base is derived from a much more complicated calculation which happened to be the same as 72.34% of the riser diameter. The riser is measured from the firebox floor, 8 to 10 times the base figure.
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Post by buckeyenut on Oct 5, 2015 14:58:55 GMT -8
The calculated base is derived from a much more complicated calculation which happened to be the same as 72.34% of the riser diameter. The riser is measured from the firebox floor, 8 to 10 times the base figure. So is the calculated base important at all if I build my batch box according to your dimensions?
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Post by shilo on Oct 5, 2015 15:57:40 GMT -8
no. you can use or the formulas or the spreadsheet. it's just give the same results.
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Post by buckeyenut on Oct 5, 2015 16:25:58 GMT -8
Great I hope to start my build soon. Building a 6" rocket batch outdoor boiler should be interesting lol.
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reyh
New Member
Posts: 37
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Post by reyh on Jan 10, 2016 3:58:05 GMT -8
I think I read that the dimensions of the box, especially the length can vary while maintaining proper operation. Unfortunately, my English did not allow me to find more info about it. What I love with batchbox is the ability to load logs, and if they could be a bit longer it would be even more convenient.
For example: a 150mm model which accept 50cm logs. The original length of 43 cm, plus 10 cm, would make 53 cm. Do we know what effect it has on performance? Thanks
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dvawolk
Full Member
DSR2 125mm open system (actual project)
Posts: 254
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Post by dvawolk on Jan 10, 2016 4:26:06 GMT -8
If you want to burn logs max 50cm in length, I would say you need at least 60cm long batch box.
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derek
New Member
Posts: 14
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Post by derek on Feb 11, 2016 13:39:06 GMT -8
Is there a technical drawing to accompany these measurements?
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Post by philippeelskens on Feb 17, 2016 6:41:50 GMT -8
The Batch Box dimensions are for rectangular shapes, right? What happens when you make the floor sloped (V-shaped). Do you keep the volume constant; is the height in the spreadsheet the height from top till heighest point of the V; or to the lowest point of the V???
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Post by peterberg on Feb 17, 2016 7:30:17 GMT -8
No, the batch box dimensions are for a floor with sloped sides. The measurement according to the spreadsheet is from the top to the lowest point of the V. Which incidentally is a narrow horizontal floor as wide as the port. The calculation of the firebox is done with the sloped sides in mind. When you leave the sloped sides out, it is recommended to compensate for the space. So in that last case the firebox need to be a bit lower . Same for the height of the port, lots of people think there might be a catch but it isn't. Build it the dimension from the spreadsheet, the overhang of the P-channel will make it a little bit shorter and you've got the right dimension. Don't think too much about it, there's nothing hidden.
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derek
New Member
Posts: 14
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Post by derek on Feb 18, 2016 6:34:30 GMT -8
Is there a technical drawing to accompany these measurements? Oops! My Android Tapatalk app does not show pictures ... like the drawing under the spreadsheet : ) Attached is a spreadsheet which calculates the dimensions of a Peterberg Batch box according to the desired Heat Riser diameter: View AttachmentPeterberg Rocket Stove Calculations
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| Heat Riser Dimensions | Inches
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| Millimeters
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| Diameter | 3
| 4
| 5
| 6
| 7
| 8
| 9
| 10
| 75
| 100
| 130
| 150
| 180
| 200
| 230
| 250
| Length
| 21-10/16
| 28-13/16
| 36
| 43-3/16
| 50-6/16
| 57 10/16
| 64-13/16
| 72
| 540
| 720
| 936
| 1080
| 1296
| 1440
| 1656
| 1800
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| Base
| 2-3/16
| 2-14/16
| 3-10/16
| 4-5/16
| 5-1/16
| 5-12/16
| 6-8/16
| 7-3/16
| 54
| 72
| 94
| 108
| 130
| 144
| 166
| 180
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| Box Dimensions
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| Width
| 4-5/16
| 5-12/16
| 7-3/16
| 8-10/16
| 10-1/16
| 11-8/16
| 12-15/16
| 14-6/16
| 108
| 144
| 187
| 216
| 259
| 288
| 331
| 360
| Height
| 6-8/16
| 8-10/16
| 10-13/16
| 12-15/16
| 15-2/16
| 17-4/16
| 19-7/16
| 21-10/16
| 162
| 216
| 281
| 324
| 389
| 432
| 497
| 540
| Depth
| 8-10/16
| 11-8/16
| 14-6/16
| 17-4/16
| 20-3/16
| 20-3/16
| 25-15/16
| 28-13/16
| 216
| 288
| 374
| 432
| 518
| 576
| 662
| 720
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| Port Dimensions
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| Width
| 1-1/16
| 1-7/16
| 1-13/16
| 2-3/16
| 2-8/16
| 2-14/16
| 3-4/16
| 3-10/16
| 27
| 36
| 47
| 54
| 65
| 72
| 83
| 90
| Height
| 4-12/16
| 5-5/16
| 7-15/16
| 9-8/16
| 11-1/16
| 12-11/16
| 14-4/16
| 15-13/16
| 119
| 158
| 206
| 238
| 285
| 317
| 364
| 396
| Depth
| 2
| 2
| 2
| 2
| 2
| 2
| 2
| 2
| 50
| 50
| 50
| 50
| 50
| 50
| 50
| 50
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| P-Channel
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| Width
| 1-1/16
| 1-7/16
| 1-13/16
| 2-3/16
| 2-8/16
| 2-14/16
| 3-4/16
| 3-10/16
| 27
| 36
| 47
| 54
| 65
| 72
| 83
| 90
| Height
| 5/16
| 7/16
| 9/16
| 10/16
| 12/16
| 14/16
| 1
| 1 1/16
| 8
| 11
| 14
| 16
| 20
| 22
| 25
| 27
| Overhang
| 5/16
| 7/16
| 9/16
| 10/16
| 12/16
| 14/16
| 1
| 1 1/16
| 8
| 11
| 14
| 16
| 20
| 22
| 25
| 27
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EDIT: Here are the equations. EDIT: Now with 3 through 10 inches and 75 through 250 mm. Given: Heat riser DIAMETER = DBase B = D*.72 Riser Height = 10*B Box Dimensions Width = B*2 Height = B*3 Depth = B*4 Port Dimensions Width = B/2 Height = B*2.2 P-Channel Dimensions Width W = B/2 Height (thickness) = ((3.14(D/2)^2)*.05/W
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