Peterberg Batch Box Dimensions

[derek]

Has anyone evaluated this design feature: A horizontally offset (instead of centered) port to facilitate vortex formation?
donkey32.proboards.com/post/6315/thread

[peterberg]

Yes, I did. The single-sided vortex didn't give results as good in mixing as the double vortex. The narrow centred port facilitate the formation of this double vortex. See an example of how that looks like here:

[jeanyves2424]

hello everybody

A question from a newbie ... so please excuse my ignorance ... and please excuse my English as I am from the cheese and wines country and do not master Shakespeare language that well ...

Looking at some diagrams Peter did from a batchbox linked to a square riser. The P-plate is positioned at the very junction between the inner wall of the riser and the batchbox (at the port in other terms). This means that everything that is "outside" the inner wall such as insulation, 4 " space between inner and outer walls and outer wall itself ... will cover/obliterate the P-channel entrance.

In this case, what should we do ? But this setup l Leave the riser inner wall on the side of the batchbox and use only the 3 other sides of the riser for the downflow of the gases ? Or create a space between the port and the riser that accommodates the extra-length linked to the interwalls space and the outer wall of the riser ? Or increase the thickness of the port to accommodate it ?

All your comment are welcome.

thanks in advance

JY

[peterberg]

Hi Jean, welcome to the boards.
I am not quite sure what you mean by "between the inner wall of the riser and the batch box". The front wall of the riser and the back wall of the firebox is actually the same row of bricks...

I'd recommend to download a SketchUp drawing from the batchrocket central resources site, chapter Designs, article "1: Straight brick core". batchrocket.eu/en/designs#brick1

There's a link to the sketchUp file. You should be able to open this with www.sketchup.com/products/sketchup-viewer

[gjh42]

I have a question about the table in the OP. For port dimensions for a 4" system, it has

riser 3" 4" 5"
Width 1-1/16 1-7/16 1-13/16
Height 4-12/16 5-5/16 7-15/16

I just noticed in the batchrocket.eu site a copy of this table where the 4" height is 6 5/16. This does appear to be more consistent in proportion to the neighboring sizes. So which is correct? If the batchrocket copy is correct, the table in the OP should be fixed.

[peterberg]

I think you are right, 5 5/16 is definitely not correct. I fixed it, thanks for signaling the error. By the way, the same table which is at the batchrocket site is in the second post of this thread. It's a clickable thumbnail image.

[smokeout]

Thanks Peterburg for posting batch box numbers. I hope to build one this winter.
My present heater has a 8" dia. 48" riser, 6" horizontal. I used your numbers to build a modified p channel. I installed a 4"dia x 4" long Venturi with a p channel connected into my 6" dia horizontal burn tunnel all the way back to the vertical riser.
Once the stove heats up, I restrict air to the fire. The top of the bell holds steady at 900F. Pretty amazing because it's burning very little wood.

[peterberg]

Jorge, welcome to the boards.
Your first post is very off-topic in the Reference Library. So I created a new topic in the Experiments section under the title "A 3" batch box, is that a realistic option?" and moved your post there.

[lucasgm]

Hi I´m new and sorry for my english.

Can you tell me the differents sizes are valuated to wich kind of m3 (of room/house) to warm?
And relationships between of thats heat riser  and sizes (specially long) of tubes of interchange mass? 

Thanks

Feb 27, 2013 13:10:27 GMT -8 pinhead said:

Attached is a spreadsheet which calculates the dimensions of a Peterberg Batch box according to the desired Heat Riser diameter:

Peterberg Rocket Stove Calculations
Heat Riser Dimensions	Inches								Millimeters
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
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
Box Dimensions
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
Port Dimensions
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	6-5/16	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
P-Channel
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

EDIT: Here are the equations.
EDIT: Now with 3 through 10 inches and 75 through 250 mm.

Given: Heat riser DIAMETER = D

Base 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

[peterberg]

Lucas, welcome to the boards.
Yasin, the translator of the French version is working on a simple formula to get a rough idea of the required size for housing. So I can't tell you nothing right now but it's on its way.
As far as I know there isn't a spreadsheet for the relation between riser and tubing in benches. There is, however, a table with figures of how bells should be sized. I presume you are in Argentina so please read batchrocket.eu/es/construccion#belltheory and the article about bell sizing.

If you want to ask more questions, please start a new thread and fire away.

[lucasgm]

Thanks Peter!, yes! I´m from Argentina, I have contact with Pablo. Thanks a lot!

[Orange]

hmm.. the spreadsheet says for 150mm system p-channel should be 54x16mm

but the website says "in this 150 mm (6") system a rectangular duct of 60x20x2 mm (2.36"x 0.8 " x 0.08") is being used."

I guess it's not a big difference and it's easier to buy 60x20x2 steel.

[peterberg]

The inside of a 60x20x2 mm duct is 56x16 mm, almost exactly what the spreadsheet says.

[kees57]

Peter

I have a 110 cm shimney pipe, did see only 100 then 130, maybe a extra column for 110 because these do excist and are

much used.

regards

[peterberg]

In that case, the cross section area of your rocket heater is rather limited, about 110x110 mm. Can't be helped, too small remains too small however much used.