Rick Howd wrote:Just to clarify a "peter channel" in my mind. It's a thin air inlet to add oxygen to a J tube just prior to entering the riser tube? I saw one pic someplace that kinda illustrated this and it almost makes sense as a way to regenerate the burn, perhaps it should be closed before you get some draw? Either that or I just can't see where it belongs.
Rick Edwards wrote:A side note about the box. Per Peter's notes, wood never goes inside the vertical port to the riser, not above the P-tube and not within 2" of the front door. So there is always 3-4" of free space above the full batch of wood and always a 2" gap between the batch and the front loading door.
Rick Edwards wrote:It has been pointed out that the transition from barrel to duct is important and needs to be larger than the duct itself.
The design here has a short 8" duct between the bottom of the first barrel and top of the third. Would it have been better to have that larger on the first barrel side or is there a reason that it works in this system? Or is it or should it be at the output of the third barrel?
Rick Edwards wrote:Ask for wood stove door glass or boro-silicate glass I think (someone correct me please). Our glass shop called it neo-ceram, a brand name I assume.
Peter Berg wrote:
This is one of the fundamentals: the port (or gate) is 70% of the riser diameter, so according to Bernoulli's theorem, in the opening itself the speed is higher and the pressure comparatively lower. The secondary air channel is right in front of the port so this lower pressure will feed air in automatically. Behind the port both the pressure and the speed do go back to normal which in turn causing a lot of turbulence. The flames inside the riser are forming a double ram's horn pattern, coming back onto itself and spiralling up, thus lengthening the time in the riser.
Rick Edwards wrote:Peter, I believe when I heard you and Matt talking that it also seemed important that the secondary air is heated for good combustion, performance, etc. Thus our P-channel being inside the batch.
You might want to expand on this a little. I've seen others in this forum ducting secondary air inlets completely from the outside of the burn box/tunnel.
Erica Wisner wrote:I would love to hear what Peter thinks about the best door. He has said that he would love to see what these skilled metal workers can do with a door, but I wonder if Peter has some ideas about how best to manage the fuel and air access by the choice of doors, sizes, viewing windows, etc.
Rick Edwards wrote:On another note, I'm considering cutting a circle out of the top of the top barrel's lid and putting a piece of neo-ceram up there sealed with the graphite braid tape and a metal clamp ring for no leakiness. Of course this is pretty tall so... wait for it... then mount a piece of mirror or reflective glass above it so looky loos can see straight down to the bottom of the heat riser and be oohed and ahed by the double rams horn.
On this note i was thinking a one foot square piece, but now just thought the whole lid could be replaced with neo-ceram of correct diameter for a lot more cost I'm sure. Any pros or cons to either?
Rick Edwards wrote:I want the doors to be full height so it is not hard to load that top wood layer and also it can be done quicker. The shorter the door is open the better all things are with this batch box. As far as the clearances go, that is just part of system knowledge and loading / firing experience. I want proper loading to be done easier and quicker for system performance and for safer operating / loading.
Rick Edwards wrote:Chimney stuff finally finished. I hate these sheet metal roofs. Way to much sealant. Shingle roofs much easier to flash.
Rick Edwards wrote:1. For the temps on the door, can this all be made out of mild angle and plate?
Rick Edwards wrote:2. Peter, how strong is the bond of the outer brick work? Not the fire brick. Can I attach to the front of these for my "jams"? Or, should I wrap a long sided angle around the sides and attach to two bricks deep? I'm also considering putting the angle between the two brick types where the thin duraboard is so you could still see the front of the outer brick wall. This would be harder to pull off and I'm not sure if possible until further investigation.
Rick Edwards wrote:3.The batches seem to run cleaner and "better" when I don't load fuel completely against the back wall. If I leave just a half inch gap things seem much better. Some of this might be other factors and coincidence. As I get more practice I'll try more loads both ways and see if the pattern continues. Wanted to see what other batchers had to say about this. It seems the fire likes a little room to slide across the back wall sideways until it can shoot into the slot. But maybe this is unnecessary.
Rick Edwards wrote:Sorry got my threads mixed up.
Satamax posted his video on page 2 of the emergency batch box wofati thread.