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Post by shilo on Nov 11, 2015 5:48:17 GMT -8
the new chet portal brings the secondary air through narrow (3.5 mm?) slits between the firebox and the riser. the slits are located at the roof of the port and at the upper 1/3 of the walls of the port. the 3 together form the shape of the letter chet. ח the chet portal can bring air from outside the stove or EGR from the barrel. right now we attend to use EGR to the legs of the chet and fresh air trough the roof of the chet (like tapered p channel) another possibility is to do a non symmetrical chet that can shift the flame pass to a better pass. it very handy in asymmetrical passes that tend to be difficult to form symmetrical ram horns.
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Post by matthewwalker on Nov 11, 2015 8:25:03 GMT -8
I'm going to swear here....
Fucking awesome shit dudes!!
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Post by shilo on Nov 11, 2015 9:44:27 GMT -8
here is a simple way to form a steady durable chet from 2 split firebricks.
link
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Post by dustylfc on Nov 11, 2015 10:31:59 GMT -8
Link don't work for me sorry
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Post by matthewwalker on Nov 11, 2015 10:43:45 GMT -8
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Post by patamos on Nov 11, 2015 10:54:53 GMT -8
Might be nice to combine these 3 threads… Beautiful. So simple. Maybe an easy retro fit too. So this portal replaces the P-channel for secondary air feed? And primary remains the same…? When using EGR (from the bell?) how is the draw affected by negative pressure? questions questions
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Post by shilo on Nov 11, 2015 11:06:29 GMT -8
this portal is not exactly replaces the P-channel because it more complicated to make it. it replace the S portal. for one that used to make P channels I recommend to replace it by the simple to make tapered P channel. I don't understand the question about the draw.
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Post by patamos on Nov 11, 2015 11:24:50 GMT -8
With EGR coming from within the bell chamber, and the whole flue gas system generally operating under negative pressure (i.e., little leaks no problem because air gets sucked in rather than gasses pushed out or the bells/flues)…
but it sounds like it draws fine.
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Post by shilo on Nov 11, 2015 11:31:28 GMT -8
any type of chimney stove operating under negative pressure
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Post by Vortex on Nov 11, 2015 11:46:40 GMT -8
Weird. I would have thought a connection from the lower barrel into the riser would flow from the riser into the barrel not the other way.
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Post by shilo on Nov 11, 2015 12:13:42 GMT -8
I too. but when I try this, I can't any flame escape. now I thinking that small amount of air enter the slit (small pressure differences)
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Post by matthewwalker on Nov 11, 2015 12:17:23 GMT -8
Higher velocity=Lower pressure=barrel->port.
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Post by independentenergy on Nov 11, 2015 12:20:01 GMT -8
I believe that Patamos refers to the fact that inside the bell there is a negative pressure , therefore if the door is chet inside the bell gases will be aspirated by the port , except when the riser is able to develop a negative pressure higher
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Post by shilo on Nov 11, 2015 12:31:12 GMT -8
the lowest pressure in the whole system is in the port.
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Post by peterberg on Nov 11, 2015 12:37:41 GMT -8
In the port, the pressure has always been lower as compared to the rest of the system. According to Bernoulli's principle the speed of gases will be higher in a temporary restriction coupled to a drop in pressure at the same time.
In short, velocity and pressure are coupled. One goes up, the other goes down. It's one of the effects that make the batch box run. Behind the port the pressure and speed goes back to the level of the rest of the system with a lot of molecule's collisions as the result.
So the chet is sucking in air all around, and since the sides this are open to the bell it acts as an Exhaust Gas Regenerator like in a turbo diesel. So far, this is the theory as far as I can see.
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