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Post by peterberg on Dec 3, 2015 12:23:05 GMT -8
I've found out the performance changed when the port depth was extended to 4". So 1/2" or even 1" extra shouldn't be a problem in my opinion.
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Post by daniel on Dec 4, 2015 14:25:08 GMT -8
I have read that the port depth could be deeper than that by a considerable amount without any problems, 0.5 to 1" more should be no problem.
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Post by daniel on Dec 4, 2015 14:25:46 GMT -8
sorry I have seen that there was already an answer to that
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Post by daniel on Jan 13, 2016 9:53:49 GMT -8
Peter, is the batchbox suppose to burn like a rocket with only flame from the tip of the wood being sucked in the port or at some point the whole batch could burn with some of the flames going not only through the port but also upwards?
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Post by peterberg on Jan 13, 2016 13:31:56 GMT -8
Second option is what happens.
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Post by pinhead on Jan 13, 2016 14:02:19 GMT -8
Peter, is the batchbox suppose to burn like a rocket with only flame from the tip of the wood being sucked in the port or at some point the whole batch could burn with some of the flames going not only through the port but also upwards? Here's your answer: www.youtube.com/watch?v=YAFhFPdwYss
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Post by daniel on Jan 13, 2016 23:12:19 GMT -8
If this is the case I guess is common to have soot from the startup toward the front of the firebox opposite from the port where there are no flames, also the door all glass without an airwash will get sooty?
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Post by satamax on Jan 14, 2016 0:22:15 GMT -8
Nope, not realy, exept may be on the edges.
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kpl
New Member
Posts: 47
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Post by kpl on Jan 14, 2016 4:53:27 GMT -8
By the way, would a batchbox be suitable to burn briquettes, made from pressed sawdust? Most common are about size of half brick. There are long briquettes - like a log - also - but those are much more expensive. Cheapest ones are made from pine sawdust, as it's what is mostly growing here. Birch is a bit better, but more expensive too. Briquettes start to disintegrate after a while, so air would not go through them, as required for batchbox. Would this be a problem? I do not remember who's design it was, where cooking stove had an ordinary-looking firebox, with narrow exit in the ceiling, just above the door. That design does not need the air to go through the fuel. Would that kind work better with briquettes? I'm more interested in slow burn than dumping a lot of energy at once, as there is not a lot of heat mass available. Edit: I was talking about this design, by Vortex: donkey32.proboards.com/thread/703/vortex-stove
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Post by daniel on Jan 14, 2016 7:04:32 GMT -8
The briquettes will work just fine, in fact anything will, pine cones I've tried and they are awesome.
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Post by daniel on Jan 14, 2016 7:08:15 GMT -8
Satamax, The door and the edges don't get the soot burned. The rest is clean but the temperature and the flames are away from the door unless I put very long wood. The steel door is also cooler so it condeses the startup smoke
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Post by paramick on Jan 15, 2016 1:28:21 GMT -8
@ kpl
I had a bit of trouble burning briquettes in my batch box . At the begining the results are encouraging as a lot of heat is produced,but very soon a LOT of coals block the base of the firebox and the prime air pathway. This is my heater's result,so you have to check it again for yourself,or wait for someone else's reply.
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Post by DCish on Jan 15, 2016 4:49:54 GMT -8
kpl, as for longer burn, Matthew Walker has also been tuning for long burn times lately. His thread on converting a j tube to a batch box has a lot of detail on that aspect, if I recall correctly.
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Post by daniel on Jan 15, 2016 5:34:14 GMT -8
paramick
When you get the red coals you can reload and it will burn fine if you have proper primary air. With this design wood is layed horizontally and you will not get always a clear path all the way to the port. After the initial fire when you could have some air getting through the stack of wood in the way you want, the coals will block it and depending on the draft and the arrangement of wood you could have flames being sucked into the port and upward in the firebox, as Peter said this is a two stage burner. What I did was put a rectangular piece of steel at the bottom of the firebox to about 5cm before the port as the secondar air and it works great.
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Post by paramick on Jan 15, 2016 8:44:20 GMT -8
Thank you Daniel for the input. I prefer burning small to medium pieces of wood,as they give warmth, light and sound. I tend to believe that every size of PVDB batchbox has its own size of fuel for optimum output.Burning briquettes give me another "problem".The beginning of the burn is fine,but the coaling phase gives low temperatures to the bell and outrageous high temperatures to the firebox area.
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