cheez
New Member
Posts: 3 
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Post by cheez on Mar 4, 2016 8:01:55 GMT -8
While I've built a half dozen rocket stoves for various uses, I hadn't found out about the innovations with the batch box until this past winter. I read through all the threads and thought I had done my research, but I'm probably still missing some basic comprehension. With the typical rocket stove, I've never had any problem with backdrafting so long as there was enough space between the bottom of the barrel and the entrance to the exhaust system, even with a less-than-ideal chimney setup. So I kind of just assumed that I wouldn't have much of a problem with the batch box drafting. But that probably just belies my naivete.
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saulo
New Member
Posts: 1
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Post by saulo on Jun 10, 2016 16:54:11 GMT -8
I'm new at this. I'm just at my tin can stage. But it's really interesting. Am from Argentine.
Wouldn't be usefull to have an horizontal first port so the doble vortex comes horizontal an then meets the vertical second port ?
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Post by mkrepel on Jun 19, 2016 6:20:41 GMT -8
Saulo, Go to this site: batchrocket.eu/en/designs. It was put together by Peter van den Berg who has done a lot of research in this subject. It is a good resource for all things batch box. Then spend some time reading through the threads in this blog site. There is a lot of good info here if you will take the time to look through it. There are also several designs for different stoves as well as some experimental design-as-you-go stoves. If you look long enough you will probably find something that will work for you. |
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Post by independentenergy on Sept 28, 2016 4:05:46 GMT -8
Hi Matt.
I wondered if this core was associated with a bell or a bench? the diameter of this system is 150 mm, how many square meters of masonry is able to heat? thank you
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Post by matthewwalker on Sept 28, 2016 6:35:03 GMT -8
Hi IE.....In my cook stove the oven is a small bell, about 2' sq. I believe the core could heat a mass of reasonable size provided draft was adequate, as with all mass heaters. I don't care for the surface area calculations as I find they are not useful to my style of building. Build your heater, add mass. If your exhaust is too hot, add more. If your draft is too low, add a bypass, use better fuel, or reduce the surface area.
I would estimate the output of this core to be the same as a PvdB batch 6", and draft requirements similar.
Hope that helps, good luck!
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Post by yhomega on Sept 28, 2016 15:56:23 GMT -8
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Post by matthewwalker on Sept 28, 2016 18:49:44 GMT -8
I don't do sketchup, but if you post a picture here I'll try to comment if I have any input.
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Post by yhomega on Sept 28, 2016 23:55:54 GMT -8
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Post by matthewwalker on Sept 29, 2016 7:24:10 GMT -8
That looks great. It isn't any different from my home cookstove. I imagine it would work very well and you would be extremely pleased with it. Good luck!
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Post by patamos on Oct 1, 2016 21:15:37 GMT -8
Couple of thoughts regarding ISA calculations. Build over size, but have a way to reduce the volume by moving features around. Baffles can vary the shape. A vertically telescoping exit port (sliding flue) can help fine tune - even optimize on a regular basis.
In the vortex i built last summer i oversized the bench bell (1sq.ft. x 6' run) and sure enough the system wanted to dump too much heat early in the run, so I added bricks along the floor to speed up the flow rate.
Removable cook tops are a gem for accessibility
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Post by matthewwalker on Oct 2, 2016 4:24:10 GMT -8
Good one Pat, and an auspicious post count. Did you get your summer shit put up and under cover last week? Here we go!
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Post by yhomega on Oct 3, 2016 4:00:06 GMT -8
That looks great. It isn't any different from my home cookstove. I imagine it would work very well and you would be extremely pleased with it. Good luck! Thanks Matt I have read that you used low density firebrick, but they are not easy to get where I live. Have you already used regular firebrick for your core? Weight for my firebrick is about 2kg (4.4 lbs). You think I should isolate the core with some perlite/vermiculite? Cheers |
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Post by patamos on Oct 3, 2016 4:55:48 GMT -8
Good one Pat, and an auspicious post count. Did you get your summer shit put up and under cover last week? Here we go! Friendly indeed  Summer shit 90% covered - if not yet tied down... List of things to do this month simply too gross to fathom... Hey have you checked out keramillica as a potential material for your secondary air port? There is talk about it over on MHA website, I swapped a few emails with the main guy David down in South Africa. Pricey stuff, but sounds amazing, and maybe worthwhile if it can eliminate the sacrificial aspect of the component for clients' builds. Hope i'm not adding to your list  |
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Post by matthewwalker on Oct 3, 2016 6:36:10 GMT -8
That looks great. It isn't any different from my home cookstove. I imagine it would work very well and you would be extremely pleased with it. Good luck! Thanks Matt I have read that you used low density firebrick, but they are not easy to get where I live. Have you already used regular firebrick for your core? Weight for my firebrick is about 2kg (4.4 lbs). You think I should isolate the core with some perlite/vermiculite? Cheers Don't bother, either build it with insulated material for the firebox or build a different design. It won't work with heavy brick in the flame path. |
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Post by matthewwalker on Oct 3, 2016 6:37:18 GMT -8
Good one Pat, and an auspicious post count. Did you get your summer shit put up and under cover last week? Here we go! Friendly indeed Summer shit 90% covered - if not yet tied down... List of things to do this month simply too gross to fathom... Hey have you checked out keramillica as a potential material for your secondary air port? There is talk about it over on MHA website, I swapped a few emails with the main guy David down in South Africa. Pricey stuff, but sounds amazing, and maybe worthwhile if it can eliminate the sacrificial aspect of the component for clients' builds. Hope i'm not adding to your list Thanks Pat, good stuff. I think my air port is perfect. I'll leave fancy materials to the sketchup tire kickers, but thank you for the tip! |
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