Stove Pipe Heat Into Return Duct

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hotblast1357
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Post by hotblast1357 » Mon. Jan. 04, 2016 6:24 pm

So on a hand fed appliance like my New Yorker boiler, when up and running good, the stack temps hover around 300-400 degree's, which would make a majic heat reclaimer useful, I am using a water to air heat exchanger in my oil furnace to heat my house, the return duct runs directly over my New Yorker.

Thoughts and opinions of installing a majic heat reclaimer or some other device (homemade) in the stove pipe and piping it to the return duct work sending heated air to the return, capturing the heat being sent up the chimney. I have a superior draft, requiring two barometric dampeners, so loss of draft from taking heat from chimney would not be an issue for me. I know these appliances do throw good heat when running, my father in law has one on each hand fed saey Hannover stove and they work quite well.

 
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StokerDon
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Post by StokerDon » Mon. Jan. 04, 2016 7:04 pm

I think in your case with that crazy draft you have, one of those heat re-claimers would work well. Be careful about plumbing it into the return duct. I like the idea, and you should get some more heat that way but, if that thing ever has an internal failure, your HVAC system will spread that CO through you home quickly.

-Don

 
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hotblast1357
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Post by hotblast1357 » Mon. Jan. 04, 2016 7:29 pm

I've given that thought; but it would have to be a very freak thing, there in thousands of homes I'm sure, and the father in law has had the one in his house for close to 8 years with no problem, and that was with the higher temps of burning wood also.

 
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McGiever
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Post by McGiever » Mon. Jan. 04, 2016 8:24 pm

StokerDon wrote:I think in your case with that crazy draft you have, one of those heat re-claimers would work well. Be careful about plumbing it into the return duct. I like the idea, and you should get some more heat that way but, if that thing ever has an internal failure, your HVAC system will spread that CO through you home quickly.

-Don
hotblast1357 wrote:I've given that thought; but it would have to be a very freak thing, there in thousands of homes I'm sure, and the father in law has had the one in his house for close to 8 years with no problem, and that was with the higher temps of burning wood also.
I'm thinking he means tapping flue gas into the proximity of your duct system...that's not common. :|


 
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hotblast1357
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Post by hotblast1357 » Mon. Jan. 04, 2016 8:26 pm

no I know its not, it is just as much a worry with a coal furnace, a weld or something could crack, causing flue gas to be introduced into the whole house rapidly.

 
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Post by BunkerdCaddis » Mon. Jan. 04, 2016 8:37 pm

Would there be much difference, in the amount of CO, between having it on a stove flue in your main living area with a fan blowing air through it or tying it into the duct work? And I wonder with the strong draft HB has, would the flue side of the re-claimer have a negative pressure anyway?

 
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hotblast1357
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Post by hotblast1357 » Mon. Jan. 04, 2016 8:41 pm

Well I would say, that if worst came to worst, my plenum fan would deff over power my chimney, my fan pulls .1" of water column, and my chimney is only pulling .02" of water column after the baro's.

but like I was saying, its no different than on a stove, blowing it into the living space.

I just wonder if it would be worth the installation.

Maybe I will have to find out the temp output of my father in laws, while burning coal, and see what kind of air temps it can put out, so I can figure out how much it would potentially raise my return duct temps.

 
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Post by McGiever » Mon. Jan. 04, 2016 9:05 pm

If you're set on capturing that heat, how about winding some copper tubing around it and thermosiphon the heat off the stovepipe into a tempering tank or an upstairs radiator/bb of your choice. :idea:


 
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hotblast1357
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Post by hotblast1357 » Mon. Jan. 04, 2016 9:11 pm

McGiever wrote:If you're set on capturing that heat, how about winding some copper tubing around it and thermosiphon the heat off the stovepipe into a tempering tank or an upstairs radiator/bb of your choice. :idea:
Well I thought about wrapping copper around it, and pre heating my dhw coil.

 
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Post by BunkerdCaddis » Mon. Jan. 04, 2016 10:45 pm

The $1700 super coil... you know you want it! :woot:

 
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hotblast1357
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Post by hotblast1357 » Tue. Jan. 05, 2016 6:24 am

I don't have a big enough heat load for that kind of horsepower! It's only -3 here right now! It would have to be somewhere around absolute zero for that to be unleashed!

 
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Post by blrman07 » Tue. Jan. 05, 2016 6:43 am

hotblast1357 wrote:I don't have a big enough heat load for that kind of horsepower! It's only -3 here right now! It would have to be somewhere around absolute zero for that to be unleashed!
You would get your money back in no time because it puts out more BTU's than it takes in and you can sell the excess!!! :roll:

 
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hotblast1357
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Post by hotblast1357 » Tue. Jan. 05, 2016 6:47 am

Lol I could probably even burn "free" wood!

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