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Post by Karl L on Aug 4, 2015 4:43:07 GMT -8
I seem to remember that MatthewWalker guessed that having the main restriction for his secondary air system at the cold end of the tube led to better performance, but he didn't go further with that. (Can't find the page now...)
I wonder if this might be because as the firebox heats up, the secondary air gets hotter and so has a larger volume by the time it reaches the delivery end. This will increase resistance and so reduce the secondary air flow and lead to a richer mixture.
But if the main restriction in the secondary air supply is deliberately situated at the cold end of the system then this effect would be much smaller than if the main restriction is at the hot end.
(Also, perhaps it would be useful to try to meter the primary air when it is hot, so that as the firebox heats up the primary air reduces slightly, tending to control the burn rate a bit. I'm not sure of an easy way to arrange that, though.)
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Post by ericvw on Aug 6, 2015 16:45:38 GMT -8
You could look into the bimetallic automatic control used on Wonderwood stoves...
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