Secondary Air Distribution System

 
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Lightning
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Post by Lightning » Thu. Sep. 18, 2014 7:03 am

I've taken readings in all those places and found that above the fire and in the flue pipe are the same. Under the fire is .005" wc stronger. I took the readings directly after a shake and load once the fire was reestablished. I believe the Coal bed itself creates a small pull by the mechanism of the combustion air flowing up thru it, heating and becoming less dense. This is the reason for the .005" stronger negative pressure. Once the grates Ash up, the pressure difference between above and below the coal bed change. Later in the burn I see the pressure become the same and just before shake down, negative pressure under the Coal bed isn't as strong as above it anymore.


 
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Lightning
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Post by Lightning » Thu. Sep. 18, 2014 7:20 am

Of course it contingent on the appliance too.. My Coal bed is trapezoidal shaped with a narrow but long grate area which makes it likely to ash up and begin slowing combustion air thru it sooner than others.. In hind site, this is the whole reason my blocking of the air passages behind the front and rear liners with fiberglass insulation. This is what makes burning anthracite in these units successful and efficient.

 
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Post by McGiever » Thu. Sep. 18, 2014 8:43 am

Underfire reading is not an accurate (useful) representation of chimney draft or of better combustion. This is due to too many changing varables...biggest being (intake) primary air regulation.

Combustion performance is a product or measurement of the exhaust or over fire side...not of the intake side.

 
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Post by KingCoal » Thu. Sep. 18, 2014 11:35 am

it has been my understanding that pretty well all current makers of stoves design and build them with an eye toward measured "chimney" draft as near as possible to the exit collar.

they have already done the numbers to translate that measurement to the effect "thru" the coal bed at the various stages of a fire.

it has also seemed that the "given" number is primarily the "max" that should be allowed. above that and there will be excess heat lost up the chimney.

we can also run lower and sometimes attain a better over all efficiency.

jm2c,
steve

 
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Lightning
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Post by Lightning » Thu. Sep. 18, 2014 2:17 pm

Yes although, isn't it interesting how the pressure changes under the fire relative to pressure over the fire thru the burn cycle. That information could be used to help perfect your shake down. For example, if you were to run two manometers, one in the flue pipe and the other under the fire, you would be able to compare the readings and determine at which point during the burn cycle that the grates are beginning to become choked with ash. With that knowledge, you would be able to shake the coal bed down with more or with less intensity for more favorable burn on the next burn cycle.. Or of course you do trial and error which has been the case for me hahaha..

Could be useful information indeed. At least with appliances like mine that are challenged in the ash clearing department..

 
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Post by steamshovel » Sat. Sep. 20, 2014 2:18 pm

the ultimate would be sensors below and above fire and in the flue, it would pinpoint a problem area or leak.
for instance if flue was a good number but under fire much less and the fire was going out, yet the draft control was open, that would point to a blockage somewhere or leak in the stove above the fire.

 
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Post by Jared43758 » Sat. Sep. 20, 2014 6:50 pm

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Post by Jared43758 » Mon. Sep. 22, 2014 10:48 am

Lightening-- this a good deal? **Broken Link(S) Removed**

 
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Post by Lightning » Mon. Sep. 22, 2014 11:53 am

Yes probably is a good deal if everything is legit.

 
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Post by hotblast1357 » Mon. Oct. 13, 2014 5:39 pm

This is with the pipes running from the Ashpan up, seems to be working so far, I got ahold of some mica so I used that instead of glass, and made a plate to hold them in.

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The pipes

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View ports

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The burn

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Post by Lightning » Mon. Oct. 13, 2014 6:06 pm

Yer fire looks nice.. :) I don't quite understand how the pipes get air from the ash pan area though.. Do they penetrate down thru somewhere? Or just exposed to the top of the grate? They come up thru in the back right?

 
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Post by wsherrick » Mon. Oct. 13, 2014 6:44 pm

That thing burns a pretty fire.

 
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Post by hotblast1357 » Mon. Oct. 13, 2014 7:06 pm

I cut the front brick down, took one inch off them it width wise, and the pipe runs down into the ash pan area, I snap a pic

 
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Post by hotblast1357 » Mon. Oct. 13, 2014 7:07 pm

wsherrick wrote:That thing burns a pretty fire.
Thank you William, it sure does

 
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Post by hotblast1357 » Tue. Oct. 14, 2014 6:23 pm

And it's the same on the left side obviously

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