Chimney Outlet Temp?

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scalabro
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Post by scalabro » Sat. Feb. 07, 2015 9:47 pm

Has anyone gone on the roof and measured this during a run?

 
scalabro
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Post by scalabro » Sun. Feb. 08, 2015 9:02 am

Bueller? ........ Bueller?

OK, crickets.....

Has anyone instrumented their chimney during the off season so they can and read gas temps at the outlet?

I figure there has got to be at least one "Von Braun" on the forum that has this data :doh:

 
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Post by WNYRob » Sun. Feb. 08, 2015 9:07 am

I have a probe at the junction of my stainless chimney and stove pipe, downstream (above) my barometer. I've seen it up to maybe 170 or so, but it is usually around 100-120. Maybe shed a few degrees at the very top of the chimney. No problem keeping my hand on the stove pipe. During snow storms, my chimney cap is warm enough to melt the snow, but not enough to immediately shed the resulting ice/icicles off the edges.

My chimney is internal running from the basement through the first floor and then through the attic. It has multiple layers (came that way from previous wood burning I assume). It has an outer 12" pipe, and then an 8" and then my 6" flue. I replaced my 6" flue when I started with coal and then filled in around the 6 and 8 with perlite. So with the perlite insulation and a fairly constant environment surrounding the chimney (albeit colder in the attic, but no wind), I would guess my exit temp is fairly close to my probe temp.

 
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Lightning
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Post by Lightning » Sun. Feb. 08, 2015 9:48 am

I've thought about it, but seems pointless with a 26 ft exterior block and mortar chimney that is constantly influenced by outside temps and wind chill effects. I don't see it (in my case) producing any valuable information.


 
scalabro
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Post by scalabro » Sun. Feb. 08, 2015 12:28 pm

Lightning wrote:I've thought about it, but seems pointless with a 26 ft exterior block and mortar chimney that is constantly influenced by outside temps and wind chill effects. I don't see it (in my case) producing any valuable information.
And so, your chimney is the perfect example to instrument. Whereas the one WNY Rob has would generally be constant and not need monitoring.

On your chimney, if monitored, you could adjust outlet temps to always provide the minimum gas density to provide optimum draft.

Another tool in the box :)

 
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Lightning
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Post by Lightning » Sun. Feb. 08, 2015 12:48 pm

Oh ok, I didn't think about it for drafting purposes. Yeah, yer right. It would help identify when I'm on course for a draft failure. :)

 
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Post by Sleeper735 » Mon. Mar. 02, 2015 6:14 pm

The issue would be with the low temps is anything under 124-127 degrees is going to condensate and produce moisture which will be absorbed into the block. If you are going to check your temps check the moisture/ humidity level.

 
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coaledsweat
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Post by coaledsweat » Mon. Mar. 02, 2015 6:41 pm

Sleeper735 wrote:The issue would be with the low temps is anything under 124-127 degrees is going to condensate and produce moisture which will be absorbed into the block. If you are going to check your temp. check the moisture/ humidity level.
I seriously doubt you'll ever get condensation from a coal appliance. No matter how cold it is you will never see water vapour rising from a coal fired chimney. I have been at my chimney top when the boiler is running and it was warm, I doubt it was over 100*.


 
scalabro
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Post by scalabro » Mon. Mar. 02, 2015 6:54 pm

coaledsweat wrote:
Sleeper735 wrote:The issue would be with the low temps is anything under 124-127 degrees is going to condensate and produce moisture which will be absorbed into the block. If you are going to check your temp. check the moisture/ humidity level.
I seriously doubt you'll ever get condensation from a coal appliance. No matter how cold it is you will never see water vapour rising from a coal fired chimney. I have been at my chimney top when the boiler is running and it was warm, I doubt it was over 100*.
I agree. I have however seen white "smoke" come out of my chimney on very cold mornings (0 and lower) upon reloading. It only lasts a minute or so. I guess if the coal is damp it would be the H2O cooking off and condensing upon hitting the fridgid air.

Or it's coal gas ready to ignite :eek2:

 
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Post by Lightning » Mon. Mar. 02, 2015 6:58 pm

There is a small percentage of moisture content in coal. But I agree it's baked out shortly after loading..

 
scalabro
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Post by scalabro » Mon. Mar. 02, 2015 7:08 pm

Lightning wrote:There is a small percentage of moisture content in coal. But I agree it's baked out shortly after loading..
Dang it!

I was hoping someone would say it's a plume of volatile gas ready to ignite......;)

 
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Post by franco b » Mon. Mar. 02, 2015 7:16 pm

There is some hydrogen I believe which when burned leaves water.

 
scalabro
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Post by scalabro » Mon. Mar. 02, 2015 7:20 pm

franco b wrote:There is some hydrogen I believe which when burned leaves water.
Aha!

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