batch box kitchen question

[independentenergy]

Hi
I would like to implement a system similar to this video:



I have a question, I would use a batch box 6 "but the riser 57cm hob too high, you can lower it a bit in some way?

more in this video:

using a "177 Rocket" this box is equal to a 6 "brick?

thanks
  .

[peterberg]

Jan 12, 2014 7:59:52 GMT -8 independentenergy said:

I would use a batch box 6 "but the riser 57cm hob too high, you can lower it a bit in some way?

Not advisable, this has been a compromise already. Lots of friction in the smoke path, several complete burns were necessary before the bench could be made active.

Jan 12, 2014 7:59:52 GMT -8 independentenergy said:

using a "177 Rocket" this box is equal to a 6 "brick?

This question is not clear, which measurement do mean?

[independentenergy]

hi Peterberg
thanks for reply.
the batch box "rocket stove 177" has different measurements compared to the system 6" built of bricks
to understand this:
horizontal2.skp (55.89 KB)

you is?

[independentenergy]

here in comparison:

[Robert]

hey independentenergy.

i am also interested if the difference in sizes matters. and where ary from actually. as i noticed the dimension of the firebrick in the design you placed are differnet then those we have in Poland. so check out those at your place.

and i am following your project and i am interested how you will progress with your setup. please update us with the pictures and teh design if you make one.

i am considering to make a similar stove with the heat exchanger for the water central heating system.
cheers.
robert

[independentenergy]

I think that is much to this project, I would like to also use a heat exchanger under the cooking plate .
use brick 220x110x60 mm
thanks for reply

[morticcio]

Basically it is a 6" system.
The 177 in this instance refers to the CSA (cross sectional area) in cm² of the 150mm (approx. 6") diameter riser e.g.
Diameter = 150mm (15cm)
Radius = 75mm (7.5cm)
CSA = πr²
CSA = 3.146 x (7.5 x 7.5) = 177cm²

[independentenergy]

ok
but using these calculations:

link

with a CSA of 177 square cm, the height of the riser should be at least 60 cm?

[morticcio]

Going by the calculations here, it should be 65cm

[independentenergy]

exact ..
So also in the cast type the riser must be 65cm?

in "compare. skp" there is a comparison between a brick and the cast.
In the cast system the riser is only 45cm high
the file was taken on the forum and it is this:
BatchBox.skp (263.31 KB)

What is the reason for this difference?
thanks

[morticcio]

I'm not sure, was this model drawn before these formulas were worked out?
My 6"/150mm batch box rocket has a 65cm riser and works great. From my experience a taller riser is better than a shorter riser.

[Robert]

i am not exactly sure so this should be confirmed but as far as i understand the total height of a riser in a cast batchbox is actually 89cm.

[independentenergy]

Jan 13, 2014 12:05:34 GMT -8 morticcio said:

I'm not sure, was this model drawn before these formulas were worked out?
My 6"/150mm batch box rocket has a 65cm riser and works great. From my experience a taller riser is better than a shorter riser.

Im sorry i don't know.
I agree with the size of the riser.
It would be useful to have a skech of a recently cast

[peterberg]

Hmmm... The calculations were worked out later, that's true. The riser length is measured from the floor of the combustion chamber and is between 8 and 10 times the base figure. That figure is 72% of the riser diameter, for a 150mm system that would be 108mm. The riser length should be 8 times base = 864mm to 10 times base = 1080mm. In inches that would be 34" to 42.5".

This recommended lengths do work properly, everybody's free to use shorter or longer risers. Please report back, we'll learn from other people's experiences, mistakes as well.

[independentenergy]

thanks Peterberg,
if I may ask, how long is the riser of the kitchen of the video I posted?