|
Post by suyana on Jun 7, 2017 6:05:11 GMT -8
Hello, I am about to build a BatchBox Rocket 180 or 200. I wanted to know what is the size of the normal chimney flue pipe, or in other words the exit pipe of the hot air after passing through the bell. Thank you Noa
|
|
|
Post by peterberg on Jun 7, 2017 7:28:49 GMT -8
That's an easy one, keep the chimney size the same as the riser diameter. One step up larger is OK, when one step smaller you'll need to alter the heater in order to allow a higher exhaust temperature. And also preferably: smooth and round inside, low mass and insulated. Inside the room where the heater is situated a single walled pipe is suitable. Most of the time people want to use an existing chimney stack, please mention what the properties are so we'll be able to work out a matching batchrocket size.
|
|
panos
New Member
Posts: 9
|
Post by panos on Jun 13, 2017 5:52:07 GMT -8
And also preferably: smooth and round inside, low mass and insulated. . Do you insulate with perlite like you do in the riser and firebox?So for example if you use regular stovepipe flue do you insulate it around with perlite?
|
|
|
Post by peterberg on Jun 16, 2017 11:13:45 GMT -8
Not necessarily. could be done with rockwool or equivalent, inner pipe, rockwool around it and outer pipe around that. When perlite is what you have, that would be fine too.
|
|
|
Post by sibelius on Oct 8, 2018 3:29:36 GMT -8
So If I build a batchrocket with heat riser of 250mm diameter, my 180mm diameter insulated stainless steel top chimney won't work?
|
|
|
Post by peterberg on Oct 8, 2018 11:27:08 GMT -8
That 250 mm diameter circle has a cross section area of 1.9 times the 180 mm circle. You can't expect it to work well with such a difference. Since it's an insulated stainless steel chimney you could get away with a 200 mm chimney which is around 27% smaller than the 250 mm diameter riser.
|
|
|
Post by sibelius on Oct 9, 2018 10:35:12 GMT -8
Ok I will change for 200mm than.
Thanks a lot for your help.
Sib
|
|